One day you wake the computer up and not see the familiar Windows logo appears, instead, the screen went blank, a warning appears several "cryptic" or some "beep beep ..". Be calm. Some start up problems are overcome by the simple solution to ... unexpected.
1. Do not worry: blank screen or a problem in the boot process is not always due to corrupted hard drive. Hard disk is now often longer than other parts of the PC, as well as running the system utilities are not needed and reinstall or replace hardware.
Learn about RAID
ALL ABOUT RAID CONTROLLER.
In late 1980 and early 1990, the provider of information technology services was faced with increasing a tremendous amount of stored data. The storage technology is becoming very expensive to put a large number of high-capacity hard drives on servers. RAID was born on the problem.
RAID is defined how? First RAID stands for Redundant Array of Inexpensive Disks (system backup disk). This is the operating system by connecting a series of low-cost drives together to form a single storage device with large capacity to support efficient and reliable than previous solutions here. RAID is used and the methods deployed in the enterprise storage and servers, but in 5 years RAID has become common for all users.
The advantage of RAID
There are three main reasons for the application of RAID:
RAID is defined how? First RAID stands for Redundant Array of Inexpensive Disks (system backup disk). This is the operating system by connecting a series of low-cost drives together to form a single storage device with large capacity to support efficient and reliable than previous solutions here. RAID is used and the methods deployed in the enterprise storage and servers, but in 5 years RAID has become common for all users.
The advantage of RAID
There are three main reasons for the application of RAID:
Inside broadband router
The broadband router is used increasingly popular and with the launch of a highly integrated controller chips today are making the broadband router to only a few components are made at the plant - it have contributed to reducing the cost of this device. Let's see a bit of components inside the router.
Figure 1: Inside a broadband router
How to reload the firmware for usb flash disk, UFD Repair
In this example I use UFD JOGR older, run communication IC's Alcor AU6981
SOLUTION FOR MOTHERBOARD BIOS SAVING PROBLEM
MOTHERBOARD BIOS SAVING PROBLEM
Card Guide Test Mainboard
MOTHERBOARD REPAIR USING TEST CARD
MOSTFET experience equivalent replacement
Reset pulse common errors and how to handle
After checking the main power supply on board is good, CLK pulse is good, then we would be interested in "Reset pulse."
Reset pulse so what?
- To easy to imagine I have two examples:
Speaking on the computer before the offline resources: When you press the power button ON the computer, the computer will first perform the POST (Power ON Salf Test) translates "the basic test when turned on" a form list of all devices when calling device, the device must be answered "yes", otherwise it will call its name forever and code will appear Hoai on "card test" also known as "post card ". If you have "roll" is finished, it will test the code on the card, and FF load carried in the boot disk to boot the operating system. Somewhat difficult to understand, only the second example.
Reset pulse so what?
- To easy to imagine I have two examples:
Speaking on the computer before the offline resources: When you press the power button ON the computer, the computer will first perform the POST (Power ON Salf Test) translates "the basic test when turned on" a form list of all devices when calling device, the device must be answered "yes", otherwise it will call its name forever and code will appear Hoai on "card test" also known as "post card ". If you have "roll" is finished, it will test the code on the card, and FF load carried in the boot disk to boot the operating system. Somewhat difficult to understand, only the second example.
The test procedure is important when Motherboard repairing
1. Check the circuit source file:
- Most of the main CPU is not needed (except the main INTEL CPU is required to have a new source file.)
- If the source file must not try to remove the 12V connector (4pin) to test if the file is 100%, the problem lies in VRM circuits was slow.
- Click the juice: if the error is only slightly MOSFET island or something, kic presses will run normally. Pressed file that is not heavy and it is slow.
- Measure the 5V (or 2v5-> 5V) in PS-ON pin. If lost: Detect Pin PS-ON -> Chip NAM or SIO. On any guy beat that guy. (If the test chip NAM quartz source and replace the chip again try it)
- Tune in MOSFET island (or islands IC): true blue -> (through) port island (or direct) -> SIO; Dam SIO port or island.
- Most of the main CPU is not needed (except the main INTEL CPU is required to have a new source file.)
- If the source file must not try to remove the 12V connector (4pin) to test if the file is 100%, the problem lies in VRM circuits was slow.
- Click the juice: if the error is only slightly MOSFET island or something, kic presses will run normally. Pressed file that is not heavy and it is slow.
- Measure the 5V (or 2v5-> 5V) in PS-ON pin. If lost: Detect Pin PS-ON -> Chip NAM or SIO. On any guy beat that guy. (If the test chip NAM quartz source and replace the chip again try it)
- Tune in MOSFET island (or islands IC): true blue -> (through) port island (or direct) -> SIO; Dam SIO port or island.
Clock pulse generator circuit of the common mistakes and how to handle
NOTE:
Including an IC circuit and a quartz clock comes 14.3.
Just find the IC Quartz 14.3 is next to the clock IC.
Duties:
Generated 14.3 MHz quartz oscillator is 14.3 MHz standard, then the clock pulse generator circuit would get from standard quartz oscillator and then multiplied by a certain percentage to create different frequency clock pulse supply for the components of the motherboard.
Including an IC circuit and a quartz clock comes 14.3.
Just find the IC Quartz 14.3 is next to the clock IC.
Duties:
Generated 14.3 MHz quartz oscillator is 14.3 MHz standard, then the clock pulse generator circuit would get from standard quartz oscillator and then multiplied by a certain percentage to create different frequency clock pulse supply for the components of the motherboard.
SIO chip common problems and how to handle
Chip Super I / O for short SIO
How to identify:
- Rectangular, about 4 cm square have the ITE, Winbond, SMSC ... like this;
Avoid confusion with the SIO chip LAN chip onboard (same size, but he usually comes a 25 000) a few onboard sound chip has the same size but less than that. Remains the third most common type of chip should be less confusion.
Duties:
- In conjunction with NAM chipset and manage the source file for the main power off.
- Management keyboard, mouse, FDD, LPT.
How to identify:
- Rectangular, about 4 cm square have the ITE, Winbond, SMSC ... like this;
Avoid confusion with the SIO chip LAN chip onboard (same size, but he usually comes a 25 000) a few onboard sound chip has the same size but less than that. Remains the third most common type of chip should be less confusion.
Duties:
- In conjunction with NAM chipset and manage the source file for the main power off.
- Management keyboard, mouse, FDD, LPT.
South Bridge common errors and how to handle
Southbridge - South Bridge Chip (I / O Control Hub: ICH)
NOTE:
- The second largest on the main (only losing Chip North Bridge)
- There are two large chips, north bridge chip is the first chip, the rest is the southbridge
NOTE:
- The second largest on the main (only losing Chip North Bridge)
- There are two large chips, north bridge chip is the first chip, the rest is the southbridge
North bridge the common errors and how to handle
*Biggest chip on the motherboard.
*Usually add a piece of radiator.
*Located near the CPU and RAM.
Does not identify CPU (CPU not running, similar to open socket CPU)
RAM not recognized (the source case was sufficient RAM): RAM is not trying hard long Beep speaker does not beep anymore no RAM or beep continuously.
Do not get VGA (AGP source case or sufficient PIC-E) (or take onboard VGA) Main Test Report Card code 25 or 26 (good kind of course is offline card, funny card, the main new new test is 26 on any error Failed to load or what is also 26).
*Usually add a piece of radiator.
*Located near the CPU and RAM.
Does not identify CPU (CPU not running, similar to open socket CPU)
RAM not recognized (the source case was sufficient RAM): RAM is not trying hard long Beep speaker does not beep anymore no RAM or beep continuously.
Do not get VGA (AGP source case or sufficient PIC-E) (or take onboard VGA) Main Test Report Card code 25 or 26 (good kind of course is offline card, funny card, the main new new test is 26 on any error Failed to load or what is also 26).
unrecognized USB
The difference is "very important" as the keyboard and mouse PS / 2 is also managed by the SIO chip USB ports because "chipset South" by managing.
Under this scheme, we found it no different than keyboard and mouse should be damaged and treatment is quite similar to keyboard and mouse.
Under this scheme, we found it no different than keyboard and mouse should be damaged and treatment is quite similar to keyboard and mouse.
No keyboard and mouse
No keyboard and mouse
Need to distinguish communication standard keyboard and mouse are PS / 2 . There is a spare USB port or just until the port ps / 2 is omitted.
In this article I just mentioned the standard keyboard and mouse PS / 2 only.
Need to distinguish communication standard keyboard and mouse are PS / 2 . There is a spare USB port or just until the port ps / 2 is omitted.
In this article I just mentioned the standard keyboard and mouse PS / 2 only.
What is Super I / O ?
Circuit synthesis Super I / O is connected to south bridge chipset in a motherboard diagram chuSuper I / O is an integrated chip on the motherboard functions mediated communication between the south bridge chipset and interfaces periphery. Super I / O is often seen on the previous motherboard. The chip Super I / O is often used for communication with peripheral devices have low bandwidth.
Super I / O often provide at least the following functions:
The controller of the floppy drive (floppy controller)
Controller for one or two serial ports (serial port controller)
The controller for the parallel port (parallel port controller)
The actual chip Super I / O expansion also integrated other features, such a chip Super I / O is the symbol of SMC LPC47M102 on the motherboard's ATX Intel VC820 can integrate out three features as above has added the following features:
Super I / O often provide at least the following functions:
The controller of the floppy drive (floppy controller)
Controller for one or two serial ports (serial port controller)
The controller for the parallel port (parallel port controller)
The actual chip Super I / O expansion also integrated other features, such a chip Super I / O is the symbol of SMC LPC47M102 on the motherboard's ATX Intel VC820 can integrate out three features as above has added the following features:
USB buying tips
USB is one of the objects separated by any person or use a computer. However, not everyone knows the secrets to purchase this product. Here are some tips.
On the market exist two types of memory cards with two different standards are 1.1 and 2.0. Same storage capacity, but the difference in price between the two types can vary up to $ 10. USB 2.0 is faster than 1.1 speed a lot. Speed data entry of type 1.1 is 12 Mb / seconds remaining 2.0 is 480 Mbps. Typically, USB 2.0 can be distinguished on the device, packaging and documentation.
On the market exist two types of memory cards with two different standards are 1.1 and 2.0. Same storage capacity, but the difference in price between the two types can vary up to $ 10. USB 2.0 is faster than 1.1 speed a lot. Speed data entry of type 1.1 is 12 Mb / seconds remaining 2.0 is 480 Mbps. Typically, USB 2.0 can be distinguished on the device, packaging and documentation.
clear cmos password
Set CMOS password is considered one of the very effective measures to computer security. CMOS password breaking is a very difficult but not impossible. But for the successful implementation also requires you to have a "skilled" certain.
There are several ways to break the CMOS password, such as replacement BIOS chip, BIOS chip circuit, use jumper, remove the battery on the motherboard, breaking the CMOS password with a number of commands, enter the default password of the manufacturer ... but for world computing "ordinary academic" as the appliance we have two methods that can apply to be temporary.
There are several ways to break the CMOS password, such as replacement BIOS chip, BIOS chip circuit, use jumper, remove the battery on the motherboard, breaking the CMOS password with a number of commands, enter the default password of the manufacturer ... but for world computing "ordinary academic" as the appliance we have two methods that can apply to be temporary.
Recover bad sectors on your hard drive
Recover bad sectors on your hard drive
Hard life for over two years using it often fails, a number of sectors will not be used anymore, but it is often referred to as Bad sector. The cause may be because most of the hard work of instability is often called physical damage.
For this reason, the ability to recover is very low and not ordinary users can do that requires the technician to professional. They also have to mention potential damages caused by software such as viruses by vandalism, power outages while working, install and uninstall software not properly ... system will also be listed in the Bad Sector list that actually it is still used. Bad sector to get back there is no other software can make a better program of Dposoft HDD Regenerator.
Hard life for over two years using it often fails, a number of sectors will not be used anymore, but it is often referred to as Bad sector. The cause may be because most of the hard work of instability is often called physical damage.
For this reason, the ability to recover is very low and not ordinary users can do that requires the technician to professional. They also have to mention potential damages caused by software such as viruses by vandalism, power outages while working, install and uninstall software not properly ... system will also be listed in the Bad Sector list that actually it is still used. Bad sector to get back there is no other software can make a better program of Dposoft HDD Regenerator.
CRT Monitor block diagram
Light color image: a color picture signal components and integrated into a video image by scanning principle, with three monochrome images are generated on the color picture tube through which the principles of color mixing color image synthesis is displayed with full color.
Printer can not print how to do?
Here step by step for the camp to introduce the tactics to deal with the printer can not print, so hope that preventive measures, in an emergency visibility mindset, quick solution to the difficulties of the printer can not print.
First check whether the printer is online
There may be loose your power cord leading to no boot, it may be because the reasons set with the printer you do not have online. If you are using, then use the network printer, there may be other side of the computer is turned off, so you can not line up. So if you see the computer online when you are prompted, Please check the situation.
MOTHERBOARD REPAIRING STEPS
MOTHERBOARD REPAIR
maintenance information
Repair parts
Do not turn fault detection method and sequence
1. Check the working conditions of the three CPU
l Power Supply
Basic mobile phone repair tutorial
Section phone repair knowledge
1, fault classification
1, caused the causes of cell phone
(1), the menu settings failure: failure is not, strictly speaking, if no calls are perhaps for the owner to set up call forwarding; play no phone is set up outbound throttling. The baffling problem, first with total reset.
(2), using failure: improper operation generally refers to the user, dislocation caused by adjustment. More common are the following categories:
1), mechanical damage. As the operation or method of application of excessive force is not correct, resulting in mobile devices rupture, deformation, and the module pin loose weld failures and other causes. In addition, flip off axis, the antenna was broken and thrown split casing, water, broken screen, also belong to this type of failure.
1, fault classification
1, caused the causes of cell phone
(1), the menu settings failure: failure is not, strictly speaking, if no calls are perhaps for the owner to set up call forwarding; play no phone is set up outbound throttling. The baffling problem, first with total reset.
(2), using failure: improper operation generally refers to the user, dislocation caused by adjustment. More common are the following categories:
1), mechanical damage. As the operation or method of application of excessive force is not correct, resulting in mobile devices rupture, deformation, and the module pin loose weld failures and other causes. In addition, flip off axis, the antenna was broken and thrown split casing, water, broken screen, also belong to this type of failure.
ATX power supply repair tips
Failure phenomenon, no output measured and found to plug 9 feet No +5 vsb voltage, so you can not judge the work of auxiliary power.
Ic3 l7805 three-terminal regulator measuring inputs and outputs were not voltage, but sometimes there is 20v input voltage, output has 5v voltage, then short the normal voltage output pin 13-14, but then again, the short cable disconnect pass the time nor the output voltage. Auxiliary power collector voltage measurement from the multimeter instructions have been found from vibration, it was suspected that a fault in the transformer secondary winding side。 Replacement capacitor c04, disconnect l7805 input, still no voltage secondary winding, again in accordance with the power failure did not come from the vibration of the end winding from the initial search fails, found that when the switch with a multimeter measuring the collector, the voltage times be back to normal and the enhanced effect by vibration is not to find fault confidence.
Survey found that r02 has become infinite resistance, the role of this resistance is filtered rectified mains voltage into the base switch is open power from the vibration produced a prerequisite, with a 390k resistor to replace r02, troubleshooting .
Ic3 l7805 three-terminal regulator measuring inputs and outputs were not voltage, but sometimes there is 20v input voltage, output has 5v voltage, then short the normal voltage output pin 13-14, but then again, the short cable disconnect pass the time nor the output voltage. Auxiliary power collector voltage measurement from the multimeter instructions have been found from vibration, it was suspected that a fault in the transformer secondary winding side。 Replacement capacitor c04, disconnect l7805 input, still no voltage secondary winding, again in accordance with the power failure did not come from the vibration of the end winding from the initial search fails, found that when the switch with a multimeter measuring the collector, the voltage times be back to normal and the enhanced effect by vibration is not to find fault confidence.
Survey found that r02 has become infinite resistance, the role of this resistance is filtered rectified mains voltage into the base switch is open power from the vibration produced a prerequisite, with a 390k resistor to replace r02, troubleshooting .
Laptop power supply principle Explained
Notebook without power fault conditions in several ways, namely:
First, use the adapter without electricity, but the use of battery power-normal;
Second, use the adapter power-normal, but without using battery power;
Third, use the adapter and the battery can not power up.
The three failures are very common in notebook computers, in order to maintain the three failures, must have the laptop power-up process.
The following simple analysis of the notebook's power-process.
When we press the power switch after the low (or high) of PWRSW # signal triggered PC87591, PC87591 and then issued a PM-PWRBTN # signals trigger the ICH, ICH back to laptop mode PC87591 three signals (Figure in step 6), and then the main power supply notebook computers to trigger the switch, such as the main power supply, CPU power supply, etc., and then follow the steps in the diagram in power. As shown.
First, use the adapter without electricity, but the use of battery power-normal;
Second, use the adapter power-normal, but without using battery power;
Third, use the adapter and the battery can not power up.
The three failures are very common in notebook computers, in order to maintain the three failures, must have the laptop power-up process.
The following simple analysis of the notebook's power-process.
When we press the power switch after the low (or high) of PWRSW # signal triggered PC87591, PC87591 and then issued a PM-PWRBTN # signals trigger the ICH, ICH back to laptop mode PC87591 three signals (Figure in step 6), and then the main power supply notebook computers to trigger the switch, such as the main power supply, CPU power supply, etc., and then follow the steps in the diagram in power. As shown.
MOBILE PHONE SERVICING- BGA CHIP REMOVAL GUIDE
BGA chip removal and welding
1. Guide
With the rapid global development of mobile communication technology, many handset makers compete to launch new compact and powerful mobile phones. In these new phones, the widespread adoption of advanced BGAIC (Balld arrays ball grid array package), which has spread the technology can significantly reduce the volume of mobile phone, enhancements, reduced power consumption, lower production costs. But, like all things beneficial to have disadvantages, BGA package IC is easy to fall caused by Weld, and to the maintenance work led to great difficulties.
BGA packaged chips are used precision optical instrument patch installed, error is 0.01mm, while the actual maintenance work, most of the repairs were not like the SMT equipment, even with all welding hot air and feel installation, little chance of success.
1. Guide
With the rapid global development of mobile communication technology, many handset makers compete to launch new compact and powerful mobile phones. In these new phones, the widespread adoption of advanced BGAIC (Balld arrays ball grid array package), which has spread the technology can significantly reduce the volume of mobile phone, enhancements, reduced power consumption, lower production costs. But, like all things beneficial to have disadvantages, BGA package IC is easy to fall caused by Weld, and to the maintenance work led to great difficulties.
BGA packaged chips are used precision optical instrument patch installed, error is 0.01mm, while the actual maintenance work, most of the repairs were not like the SMT equipment, even with all welding hot air and feel installation, little chance of success.
BASIC ELECTRONICS-FET TESTING
As the FET structure, principle and common transistor different conditions in the amateur use multimeter to determine the method is not the same as before the test what your hands touch touch water pipe, or ground, to let go of the body's charge.
1.G pole (gate) of the judge: multimeter with R × 100 files, each FET were measured resistance between two feet (both positive and negative to the test once), there should be a pair of feet to several hundred ohms resistance (such as are high-value,
1.G pole (gate) of the judge: multimeter with R × 100 files, each FET were measured resistance between two feet (both positive and negative to the test once), there should be a pair of feet to several hundred ohms resistance (such as are high-value,
BASIC ELECTRONIC-BASIC COMPONENTS DETECTION METHODS
Components of the detection is an appliance repair basics, how to accurately and effectively detect the components of the relevant parameters to determine whether components of the normal, not a stereotyped thing, must be based on different components use different methods to determine components of normal or not. Especially for beginners, proficiency testing methods commonly used components and experience is necessary, the following test on the common experience of electronic components and test methods are introduced for the right.
1, resistor detection methods and experience:
1, resistor detection methods and experience:
BASIC ELECTRONICS- USE OF CAPACITORS
1. DC blocking: role is to stop by and let the exchange by DC.
2. Bypass (decoupling): for the exchange of circuit components in parallel to provide certain low- impedance path.
2. Bypass (decoupling): for the exchange of circuit components in parallel to provide certain low- impedance path.
Detection of laser diode
(A) determine the pin order of the multimeter to put R × 1K block, in accordance with the detection of common diode positive and negative resistance method, can be laser diode of the pin in the order determined.
EPSON C4X series printer maintenance
Printer connected to the mains, press the printer's power button when the green indicator light does not shine, the printer does not work, press the key for the red ink light is not bright, it could be the printer's power supply broke down.
The first step to take off the printer's plastic cover. Off-white plastic cover with plastic buckle 7 is connected with a gray base with a screwdriver to push up one by one plastic button, you can take off the plastic cover and then remove the paper into the frame. Connected to electricity, with a multimeter to check the availability of CN2 on the 36 V voltage , shown in Figure 2, if no voltage,
The first step to take off the printer's plastic cover. Off-white plastic cover with plastic buckle 7 is connected with a gray base with a screwdriver to push up one by one plastic button, you can take off the plastic cover and then remove the paper into the frame. Connected to electricity, with a multimeter to check the availability of CN2 on the 36 V voltage , shown in Figure 2, if no voltage,
Add Printer Tip Print Spooler service is not running solution
When this problem occurs, first check-related services have not started
In the Start - Run - CMD - SERVICES. MSC start the service component or on the desktop select "My Computer" right choice "management";
In the Start - Run - CMD - SERVICES. MSC start the service component or on the desktop select "My Computer" right choice "management";
HOW TO REPAIR COMPUTER MOTHERBOARD
MOTHERBOARD NOT BOOT
a. check whether the short circuit CPU voltage
b. MOS tube 5V and 3V voltage is normal
c. check motherboard VID0-VID5 signal
d. 12V Power Management Chip 0 ohm affect, MOS capacitor for the wrong side of the tube will affect the voltage
e. VID_GOOD signal
a. check whether the short circuit CPU voltage
b. MOS tube 5V and 3V voltage is normal
c. check motherboard VID0-VID5 signal
d. 12V Power Management Chip 0 ohm affect, MOS capacitor for the wrong side of the tube will affect the voltage
e. VID_GOOD signal
Reform yourself making mobile phone charger, USB data cable and headset
Reform yourself making mobile phone charger, USB data cable and headphones
Many reasons made cell phones for models, charger, USB data cable and earphones since the original machine can not buy the charger cable and headset, to tell you here yourself, use the other line conversion method: This method is suitable for a certain practical ability of the machine friendly, if a novice, it is recommended not to do the same action! Many domestic phone because the model because, charger, USB data cable and earphones after the original machine can not buy the charger cable and headset, to tell you here yourself, with other line conversion method: this method is suitable for a certain Friends of practical ability of the machine, if a novice, it is recommended not to do the same action!
Tools ready: Tools to prepare:
1, multimeter a 1, a multimeter
2: The full line phone socket pin plug a 2: The full line phone socket pin plug 1
3: The maintenance of a power table (need short-circuit protection) 3: The maintenance of a power table (need short-circuit protection)
Many reasons made cell phones for models, charger, USB data cable and earphones since the original machine can not buy the charger cable and headset, to tell you here yourself, use the other line conversion method: This method is suitable for a certain practical ability of the machine friendly, if a novice, it is recommended not to do the same action! Many domestic phone because the model because, charger, USB data cable and earphones after the original machine can not buy the charger cable and headset, to tell you here yourself, with other line conversion method: this method is suitable for a certain Friends of practical ability of the machine, if a novice, it is recommended not to do the same action!
Tools ready: Tools to prepare:
1, multimeter a 1, a multimeter
2: The full line phone socket pin plug a 2: The full line phone socket pin plug 1
3: The maintenance of a power table (need short-circuit protection) 3: The maintenance of a power table (need short-circuit protection)
Basic knowledge of CPU power supply circuit (switch) - revised
describes the basic knowledge of CPU power circuit. ① single-phase power circuit structure and principle * Single-phase power circuit structure and principle *
Main PWM circuit chip CPU, MOSEFT tube, inductance, capacitance of four components. Main PWM circuit chip CPU, MOSEFT tube, inductance, capacitance of four components. MOSEFT tube which is an electronic switch (such as the image above K1, K2), but the high frequency switch, second switch from 10,000 to 15,000 times. One MOSEFT tube is an electronic switch (such as the image above K1, K2), but the high frequency switch, second switch from 10,000 to 15,000 times. Inductors and capacitors from the two roles here, save energy and filtering. Inductance and capacitance from the two roles here, save energy and filtering.
Main PWM circuit chip CPU, MOSEFT tube, inductance, capacitance of four components. Main PWM circuit chip CPU, MOSEFT tube, inductance, capacitance of four components. MOSEFT tube which is an electronic switch (such as the image above K1, K2), but the high frequency switch, second switch from 10,000 to 15,000 times. One MOSEFT tube is an electronic switch (such as the image above K1, K2), but the high frequency switch, second switch from 10,000 to 15,000 times. Inductors and capacitors from the two roles here, save energy and filtering. Inductance and capacitance from the two roles here, save energy and filtering.
motherboard cable connection method
We installed a new machine when the connection will find a lot of need for connection on the motherboard. We installed a new machine when the connection will find a lot of need for connection on the motherboard. For hard drives, CD-ROM device to connect all of these are not unfamiliar. For hard drives, CD-ROM device to connect all of these are not unfamiliar. But some smaller cable or puzzled many friends, such as pre-usb cable, front audio cable, power switch, hard drive indicator light This type of cable. But some smaller cable or puzzled many friends, such as pre-usb cable, front audio cable, power switch, hard light of this type of cable. Today, computer repair network for friends summed up what so on cable connections, and I hope to you solve practical problems. Today, computer repair network for friends summed up what so on cable connections, and I hope to give you solve practical problems. (This article from the computer maintenance network) (This article is from computer repair network)
USB Interface USB Interface
USB Interface USB Interface
EPSON Stylus Printer micro-adjustment
EPSON stylus printer will print the bottom line to the second page
Causes and solutions: Causes and solutions:
Fine-tune the printer to adjust the upper and lower margins,
Causes and solutions: Causes and solutions:
Fine-tune the printer to adjust the upper and lower margins,
ALL NEW MOBILE UNLOCKING CODES
Motorola all machines lock: Press MENU +5 +1 / 2
T190 unlock code: 20010903 T190 unlock code: 20010903
T191 unlock code: 19980722 T191 unlock code: 19980722
3X8/2X88/998/8088/L2000/7689/T189/C289 such as the initial password is 1234; phone password is 000000; unlock method: If there is no test card, the first input 1234, such as the password has been changed, press the Menu key would lead to "modify the lock code", press OK key, then enter 000 000 four-digit phone password is displayed if the security code has been changed, you can only test card or software tools solution. 3X8/2X88/998/8088/L2000/7689/T189/C289 such as the initial password is 1234; phone password is 000000; unlock method: If there is no test card, the first input 1234,
T190 unlock code: 20010903 T190 unlock code: 20010903
T191 unlock code: 19980722 T191 unlock code: 19980722
3X8/2X88/998/8088/L2000/7689/T189/C289 such as the initial password is 1234; phone password is 000000; unlock method: If there is no test card, the first input 1234, such as the password has been changed, press the Menu key would lead to "modify the lock code", press OK key, then enter 000 000 four-digit phone password is displayed if the security code has been changed, you can only test card or software tools solution. 3X8/2X88/998/8088/L2000/7689/T189/C289 such as the initial password is 1234; phone password is 000000; unlock method: If there is no test card, the first input 1234,
MOTHERBOARD South bridge bad way to judge
1. Play PCI A14 of the resistance, on the ground less than 80 Euro for the South Bridge bad.
2. Standby, South Bridge hot, bad for the bridge. 2. Standby, hot south bridge, the bridge bad. (Excluding AGP supply pipe damage.) (Excluding AGP power tube is damaged.)
2. Standby, South Bridge hot, bad for the bridge. 2. Standby, hot south bridge, the bridge bad. (Excluding AGP supply pipe damage.) (Excluding AGP power tube is damaged.)
Laser printer cartridge and Toner Cartridge structures
Most brands of laser printer cartridges and powder box structure is integrated, and this part of the problem of laser printer parts most likely to understand its structure is very good for our maintenance.
1, imaging features some of the components
Photosensitive drum: is made of aluminum tube coated with selenium, the selenium material for the insulator in the dark, exposed site of the conductor. When the laser beam emitted by them came to light, to light the information matrix of dots to form a electrostatic latent image.
Drum drive gear: with the photosensitive drum at one end is fixed by the printer delivered impetus for drum rotation, while driving transfer roller rotation.
1, imaging features some of the components
Photosensitive drum: is made of aluminum tube coated with selenium, the selenium material for the insulator in the dark, exposed site of the conductor. When the laser beam emitted by them came to light, to light the information matrix of dots to form a electrostatic latent image.
Drum drive gear: with the photosensitive drum at one end is fixed by the printer delivered impetus for drum rotation, while driving transfer roller rotation.
LCD Troubleshooting Maintenance
1, PANEL (LCD)
2, A / D Driver Board;
3, LCD screen line-drive
4, high-pressure plate (also known as step-up board, high-pressure section, INVERTER)
5, high-pressure plate wire 5, high-pressure plate wire
6, Power adapter (external, generally DC 3A/12V), are also part of the display of the open
Off the power section is built into the machine, the direct input AC220V to Off the power section is built into the machine, the direct input AC220V to
7, VGA cable
8, shell
The following is based on the maintenance of our daily summary of some of the maintenance ideas:
2, A / D Driver Board;
3, LCD screen line-drive
4, high-pressure plate (also known as step-up board, high-pressure section, INVERTER)
5, high-pressure plate wire 5, high-pressure plate wire
6, Power adapter (external, generally DC 3A/12V), are also part of the display of the open
Off the power section is built into the machine, the direct input AC220V to Off the power section is built into the machine, the direct input AC220V to
7, VGA cable
8, shell
The following is based on the maintenance of our daily summary of some of the maintenance ideas:
Learn Basic UNIX commands
Basic UNIX commands
Note: not all of these are actually part of UNIX itself, and you may not find them on all UNIX machines. But they can all be used on turing in essentially the same way, by typing the command and hitting return. Note that some of these commands are different on non-Solaris machines -
If you've made a typo, the easiest thing to do is hit CTRL-u to cancel the whole line. But you can also edit the command line
UNIX is case-sensitive.
Files
• ls --- lists your files
ls -l --- lists your files in 'long format', which contains lots of useful information, e.g. the exact size of the file, who owns the file and who has the right to look at it, and when it was last modified.
ls -a --- lists all files, including the ones whose filenames begin in a dot, which you do not always want to see.
There are many more options, for example to list files by size, by date, recursively etc.
Note: not all of these are actually part of UNIX itself, and you may not find them on all UNIX machines. But they can all be used on turing in essentially the same way, by typing the command and hitting return. Note that some of these commands are different on non-Solaris machines -
If you've made a typo, the easiest thing to do is hit CTRL-u to cancel the whole line. But you can also edit the command line
UNIX is case-sensitive.
Files
• ls --- lists your files
ls -l --- lists your files in 'long format', which contains lots of useful information, e.g. the exact size of the file, who owns the file and who has the right to look at it, and when it was last modified.
ls -a --- lists all files, including the ones whose filenames begin in a dot, which you do not always want to see.
There are many more options, for example to list files by size, by date, recursively etc.
Power On Self Test Beep Codes for a specific meaning
BIOS for the Award BIOS's a short: the system start normally. BIOS for the Award BIOS's a short: the system start normally. Congratulations, your machine without any problem. Congratulations, your machine without any problem.
2 Short: General error, please enter CMOS Setup, reset the incorrect option. 2 Short: General error, please enter CMOS Setup, reset the incorrect option.
2 Short: General error, please enter CMOS Setup, reset the incorrect option. 2 Short: General error, please enter CMOS Setup, reset the incorrect option.
What is CMOS?
BIOS is stored in CMOS memory, CMOS is a complementary metal-oxide semiconductor initials of the first to write Chinese is a complementary metal-oxide semiconductor, which is a semiconductor technology that will become the right of the metal-oxide semiconductor field-effect transistor (MOSFET) integrated on a silicon chip. BIOS is stored in CMOS memory, CMOS is a complementary metal-oxide semiconductor initials of the first to write Chinese is a complementary metal-oxide semiconductor, which is a semiconductor technology that will become the right of the metal-oxide semiconductor field-effect transistor (MOSFET) integrated on a silicon chip.
Diode characteristics and applications
In almost all electronic circuits, it is necessary to use semiconductor diode, which in many circuits play an important role, it is the birth of one of the first semiconductor device, its applications are very extensive.
Diode Diode works works
Crystal diode as a p-type semiconductor and n-type semiconductor pn junction formed in its interface on both sides of the formation of space charge layer, and built self-built electric field. Crystal diode as a p-type semiconductor and n-type semiconductor pn junction formed in its interface on both sides of the formation of space charge layer,
Diode Diode works works
Crystal diode as a p-type semiconductor and n-type semiconductor pn junction formed in its interface on both sides of the formation of space charge layer, and built self-built electric field. Crystal diode as a p-type semiconductor and n-type semiconductor pn junction formed in its interface on both sides of the formation of space charge layer,
In-depth understanding of the hard disk structure
Opened an in-depth understanding of the hard disk data recovery must be preceded by the overall physical structure of the hard disk have a full understanding. As a high precision parts, hard disk external structure is relatively simple, the real high-tech body in its internal disk. As a high precision parts, hard disk external structure is relatively simple, the real high-tech content in its body within the disc.
1. The external structure of the hard disk 1. The external structure of the hard disk
Hard drive external structure is not complicated, mainly by the power supply interface, data interface, the control circuit board composition. Hard drive external structure is not complicated, mainly by the power supply interface, data interface, the control circuit board composition. For IDE hard drives, Serial-ATA hard drive, SCSI For IDE hard drives, Serial-ATA hard drive, SCSI
1. The external structure of the hard disk 1. The external structure of the hard disk
Hard drive external structure is not complicated, mainly by the power supply interface, data interface, the control circuit board composition. Hard drive external structure is not complicated, mainly by the power supply interface, data interface, the control circuit board composition. For IDE hard drives, Serial-ATA hard drive, SCSI For IDE hard drives, Serial-ATA hard drive, SCSI
CPU fan noise removal method
The most important tool as a computer cooling fan, but also because the use of high frequency, resulting in noise is increasing. Faced with this situation, you thought the noise eradicated there? Faced with this situation, you thought the noise eradicated there? Perhaps you will say the fan is not on the line of direct replacement, but in fact as long as the fans do not bad, there is no need to replace with new, old fans as long as proper maintenance, can be returned to normal. Perhaps you will say the fan is not on the line of direct replacement, but in fact as long as the fans do not bad,
Method of hard disk damage repair
1, hard disk damage test, if there part of the sector on the hard disk can not be properly read or write or visit the situation, the general was known as a bad fan (bad sector), which is commonly known as "bad sectors . "hard disk bad sectors is very complex, and some recorded in the sector by the checksum code, sector identification, address information, which do not normally lead to logical errors. Hard disk bad sector the situation is very complex, and some recorded in the sector by the checksum code, sector identification, address information, which do not normally lead to logical errors.
windows crashes, blue screen error code meaning of the whole solution of
Computer Blue Screen
0 0x0000 job is completed. 0 0x0000 job is completed.
1 0x0001 Incorrect function. 1 0x0001 Incorrect function.
2 0x0002 system can not find the file specified. 2 0x0002 system can not find the file specified.
3 0x0003 system can not find the path specified. 3 0x0003 system can not find the path specified.
4 0x0004 system can not open the file. 4 0x0004 system can not open the file.
5 0x0005 Access is denied. 5 0x0005 Access is denied.
6 0x0006 invalid code. 6 0x0006 invalid code.
7 0x0007 storage control block has been destroyed. 7 0x0007 storage control block has been destroyed.
8 0x0008 storage space, unable to process this command. 8 0x0008 storage space, unable to process this command.
0 0x0000 job is completed. 0 0x0000 job is completed.
1 0x0001 Incorrect function. 1 0x0001 Incorrect function.
2 0x0002 system can not find the file specified. 2 0x0002 system can not find the file specified.
3 0x0003 system can not find the path specified. 3 0x0003 system can not find the path specified.
4 0x0004 system can not open the file. 4 0x0004 system can not open the file.
5 0x0005 Access is denied. 5 0x0005 Access is denied.
6 0x0006 invalid code. 6 0x0006 invalid code.
7 0x0007 storage control block has been destroyed. 7 0x0007 storage control block has been destroyed.
8 0x0008 storage space, unable to process this command. 8 0x0008 storage space, unable to process this command.
SDRAM memory repair method
An SD memory maintenance practices, use multimeter measuring method of memory chips
On the motherboard and memory data pins is 64, D0-D63, in order to protect the memory data bit feet, in the D0-D63 which 64 data bits plus feet with a small resistance resistor (10 EU) threshold flow effect. On the motherboard and memory data pins is 64, D0-D63, in order to protect the memory data bit feet, in the D0-D63 which 64 data bits plus feet with a small resistance resistor (10 EU) threshold flow effect. While the test Instrument The main principle is to repeat tests with the program memory chips of each data bit pin to see if there is no breakdown or short circuit pin data bits, there is a chip's clock pin, the address pins.
On the motherboard and memory data pins is 64, D0-D63, in order to protect the memory data bit feet, in the D0-D63 which 64 data bits plus feet with a small resistance resistor (10 EU) threshold flow effect. On the motherboard and memory data pins is 64, D0-D63, in order to protect the memory data bit feet, in the D0-D63 which 64 data bits plus feet with a small resistance resistor (10 EU) threshold flow effect. While the test Instrument The main principle is to repeat tests with the program memory chips of each data bit pin to see if there is no breakdown or short circuit pin data bits, there is a chip's clock pin, the address pins.
ATX power supply of knowledge
At present, ATX power supplies are widely used in computers, compared with the AT power supply, it is more in line with "green computer" energy-saving standards,
It corresponds to the motherboard is the ATX motherboard. It corresponds to the motherboard is the ATX motherboard.
1.ATX power characteristics of 1.ATX Power Characteristics
Compared with the AT power supply, ATX power supply increases "+3.3 V, +5 VSB, PS-ON" three outputs. Compared with the AT power supply, ATX power supply increases "+3.3 V, +5 VSB, PS-ON" three outputs. Which "+3.3 V" output is mainly for the CPU use, and "+5 VSB", "PS-ON" ATX power supply output is embodied characteristics. In which "+3.3 V" output is mainly for the CPU use, and "+5 VSB", "PS-ON" while the output reflects the ATX power supply features.
It corresponds to the motherboard is the ATX motherboard. It corresponds to the motherboard is the ATX motherboard.
1.ATX power characteristics of 1.ATX Power Characteristics
Compared with the AT power supply, ATX power supply increases "+3.3 V, +5 VSB, PS-ON" three outputs. Compared with the AT power supply, ATX power supply increases "+3.3 V, +5 VSB, PS-ON" three outputs. Which "+3.3 V" output is mainly for the CPU use, and "+5 VSB", "PS-ON" ATX power supply output is embodied characteristics. In which "+3.3 V" output is mainly for the CPU use, and "+5 VSB", "PS-ON" while the output reflects the ATX power supply features.
Memory fault diagnosis and maintenance of
Computer memory is the most prone to failure of accessories one of the products, if the power is in the press box or a computer chassis alarm horn can not be repeated self, in most cases due to memory failure. While in all kinds of memory failures are basically destroyed the main memory, when we tend to lose the memory will be destroyed after a direct replacement in the side of the memory. In all kinds of memory failures are basically destroyed the main memory, when we tend to lose the memory will be destroyed after a direct replacement in the side of the memory. Because of memory compared with other cheaper parts, resulting in a lot of a friend once the machine memory problems detected, but not through any direct replacement of memory processing, resulting in great waste.
Chassis Front USB Connection
First, an overview because each USB peripheral interface able to provide +5 V500MA current, when we connected on-board USB interface, must be in strict accordance with the motherboard manual for installation. Absolutely not an error, or they will burn the motherboard or a peripheral. Definitely not an error, or they will burn the motherboard or a peripheral. I believe there are a lot of friends in the USB plug to connect front-line similar happened when the "smoking something,
Epson Stylus printer print head fault repair
Although the ink-jet printer and laser printer is currently very popular office equipment, but the stylus printer still in the financial, commercial areas such as a wide range of applications, which was mainly due to stylus printer has a low price, the use of economic, technological maturity etc., and stylus printer there are a number of specialized uses, such as printing more bills, etc. together. Of course, it also has a disadvantage that is a high failure rate, and its print head failure again of the total fault the rate of about 70%, below the print head for everyone to talk about the failure of maintenance of way. Of course, it also has a disadvantage that is a high failure rate, and its print head failure also accounted for 70% of the total failure rate of about Here's to talk to you about the repair method of print head failure.
Three main points of the motherboard repair
1, non-maintenance of electricity
1, Southbridge (electricity) 1, Southbridge (electricity)
2, I / O (power supply) 2, I / O (Power)
3, the door circuit (VCC) 3, the door circuit (VCC)
4, XY (both ends voltage) 4, XY (both ends voltage)
5, COMS battery 5, COMS battery
6, Jump (jumper cap) 2.5V-3.3V 6, Jump (jumper cap) 2.5V-3.3V
7, Power-on is not level transistor 5V 7, Power-on is not level transistor 5V
8, 5VSB 8, 5VSB
1, Southbridge (electricity) 1, Southbridge (electricity)
2, I / O (power supply) 2, I / O (Power)
3, the door circuit (VCC) 3, the door circuit (VCC)
4, XY (both ends voltage) 4, XY (both ends voltage)
5, COMS battery 5, COMS battery
6, Jump (jumper cap) 2.5V-3.3V 6, Jump (jumper cap) 2.5V-3.3V
7, Power-on is not level transistor 5V 7, Power-on is not level transistor 5V
8, 5VSB 8, 5VSB
Hard disk damage restoration
Hard disk damage restoration of hard disk is a very important part of the computer, all information and data will be stored in the hard disk, once the hard disk errors, and sometimes the loss of data than the loss of computers become obsolete as a whole even more significant. However, as computer hardware, and many people think of the hard disk is not easy to be easily damaged, can not be started once the bad is the situation, as well as people think that is very easy to identify bad sectors,
ALL KEY BOARD SHORT CUTS AND COMEN COMMANDS
F1 Help
F2 renamed F2 renamed
F3 Search for F3 Search
F4 Address F4 Address
F5 Refresh F5 refresh
F6 Switch F6 Switch
F10 Menu F10 Menu
CTRL + A Select All CTRL + A Select All
CTRL + C to copy CTRL + C to copy
CTRL + X Cut CTRL + X Cut
CTRL + V Paste CTRL + V Paste
CTRL + Z Undo CTRL + Z Undo
CTRL + O Open CTRL + O to open
F2 renamed F2 renamed
F3 Search for F3 Search
F4 Address F4 Address
F5 Refresh F5 refresh
F6 Switch F6 Switch
F10 Menu F10 Menu
CTRL + A Select All CTRL + A Select All
CTRL + C to copy CTRL + C to copy
CTRL + X Cut CTRL + X Cut
CTRL + V Paste CTRL + V Paste
CTRL + Z Undo CTRL + Z Undo
CTRL + O Open CTRL + O to open
How to enter Samsung 171S LCD factory pattern?
Boot mode, the OSD menu, the brightness and contrast values will be adjusted to 0,
how to repair bb5 contact service
problem:contact service
tools i use:
jaf w/pkey orig
ufc cable
procedure:
*info in jaf software
tools i use:
jaf w/pkey orig
ufc cable
procedure:
*info in jaf software
XP REPAIR INSTALL
XP INSTALL
1. Boot the computer using the XP CD. You may need to change the
boot order in the system BIOS. Check your system documentation
for steps to access the BIOS and change the boot order.
2. When you see the "Welcome To Setup" screen, you will see the
options below This portion of the Setup program prepares Microsoft
Windows XP to run on your computer:
1. Boot the computer using the XP CD. You may need to change the
boot order in the system BIOS. Check your system documentation
for steps to access the BIOS and change the boot order.
2. When you see the "Welcome To Setup" screen, you will see the
options below This portion of the Setup program prepares Microsoft
Windows XP to run on your computer:
Remove newfolder.exe virus
1. Cut The Supply Line
1. Search for autorun.inf file. It is a read only file so you will have to change it to normal by right clicking the file , selecting the properties and un-check the read only option
2. Open the file in notepad and delete everything and save the file.
3. Now change the file status back to read only mode so that the virus could not get access again.
4. Autorun INF: cutting the supply line
1. Search for autorun.inf file. It is a read only file so you will have to change it to normal by right clicking the file , selecting the properties and un-check the read only option
2. Open the file in notepad and delete everything and save the file.
3. Now change the file status back to read only mode so that the virus could not get access again.
4. Autorun INF: cutting the supply line
USING SONY ERICSSON SETOOL2
Setool2 Lite is a free program that will allow us to customize our phones flash and Sony Ericsson DB2020 CID49/51/52 and DB2010/DB2012 CID49/50/51/52.
NOTE: To connect in flash mode. Turn off the phone, remove and reinsert the battery without turning the phone press and hold the key "C" then connect the cable, one recognizes the phone see release "C".
Basic functions.
Unlock / Repair: Allows you to read the phone lock code, it is NOT to release the net.
Flash: To start the process of updating / flashing.
NOTE: To connect in flash mode. Turn off the phone, remove and reinsert the battery without turning the phone press and hold the key "C" then connect the cable, one recognizes the phone see release "C".
Basic functions.
Unlock / Repair: Allows you to read the phone lock code, it is NOT to release the net.
Flash: To start the process of updating / flashing.
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Troubleshooting tips hard drive
One day you wake the computer up and not see the familiar Windows logo appears, instead, the screen went blank, a warning appears several "cryptic" or some "beep beep ..". Be calm. Some start up problems are overcome by the simple solution to ... unexpected.
1. Do not worry: blank screen or a problem in the boot process is not always due to corrupted hard drive. Hard disk is now often longer than other parts of the PC, as well as running the system utilities are not needed and reinstall or replace hardware.
1. Do not worry: blank screen or a problem in the boot process is not always due to corrupted hard drive. Hard disk is now often longer than other parts of the PC, as well as running the system utilities are not needed and reinstall or replace hardware.
Learn about RAID
ALL ABOUT RAID CONTROLLER.
In late 1980 and early 1990, the provider of information technology services was faced with increasing a tremendous amount of stored data. The storage technology is becoming very expensive to put a large number of high-capacity hard drives on servers. RAID was born on the problem.
RAID is defined how? First RAID stands for Redundant Array of Inexpensive Disks (system backup disk). This is the operating system by connecting a series of low-cost drives together to form a single storage device with large capacity to support efficient and reliable than previous solutions here. RAID is used and the methods deployed in the enterprise storage and servers, but in 5 years RAID has become common for all users.
The advantage of RAID
There are three main reasons for the application of RAID:
RAID is defined how? First RAID stands for Redundant Array of Inexpensive Disks (system backup disk). This is the operating system by connecting a series of low-cost drives together to form a single storage device with large capacity to support efficient and reliable than previous solutions here. RAID is used and the methods deployed in the enterprise storage and servers, but in 5 years RAID has become common for all users.
The advantage of RAID
There are three main reasons for the application of RAID:
Inside broadband router
The broadband router is used increasingly popular and with the launch of a highly integrated controller chips today are making the broadband router to only a few components are made at the plant - it have contributed to reducing the cost of this device. Let's see a bit of components inside the router.
Figure 1: Inside a broadband router
How to reload the firmware for usb flash disk, UFD Repair
In this example I use UFD JOGR older, run communication IC's Alcor AU6981
SOLUTION FOR MOTHERBOARD BIOS SAVING PROBLEM
MOTHERBOARD BIOS SAVING PROBLEM
Card Guide Test Mainboard
MOTHERBOARD REPAIR USING TEST CARD
MOSTFET experience equivalent replacement
Reset pulse common errors and how to handle
After checking the main power supply on board is good, CLK pulse is good, then we would be interested in "Reset pulse."
Reset pulse so what?
- To easy to imagine I have two examples:
Speaking on the computer before the offline resources: When you press the power button ON the computer, the computer will first perform the POST (Power ON Salf Test) translates "the basic test when turned on" a form list of all devices when calling device, the device must be answered "yes", otherwise it will call its name forever and code will appear Hoai on "card test" also known as "post card ". If you have "roll" is finished, it will test the code on the card, and FF load carried in the boot disk to boot the operating system. Somewhat difficult to understand, only the second example.
Reset pulse so what?
- To easy to imagine I have two examples:
Speaking on the computer before the offline resources: When you press the power button ON the computer, the computer will first perform the POST (Power ON Salf Test) translates "the basic test when turned on" a form list of all devices when calling device, the device must be answered "yes", otherwise it will call its name forever and code will appear Hoai on "card test" also known as "post card ". If you have "roll" is finished, it will test the code on the card, and FF load carried in the boot disk to boot the operating system. Somewhat difficult to understand, only the second example.
The test procedure is important when Motherboard repairing
1. Check the circuit source file:
- Most of the main CPU is not needed (except the main INTEL CPU is required to have a new source file.)
- If the source file must not try to remove the 12V connector (4pin) to test if the file is 100%, the problem lies in VRM circuits was slow.
- Click the juice: if the error is only slightly MOSFET island or something, kic presses will run normally. Pressed file that is not heavy and it is slow.
- Measure the 5V (or 2v5-> 5V) in PS-ON pin. If lost: Detect Pin PS-ON -> Chip NAM or SIO. On any guy beat that guy. (If the test chip NAM quartz source and replace the chip again try it)
- Tune in MOSFET island (or islands IC): true blue -> (through) port island (or direct) -> SIO; Dam SIO port or island.
- Most of the main CPU is not needed (except the main INTEL CPU is required to have a new source file.)
- If the source file must not try to remove the 12V connector (4pin) to test if the file is 100%, the problem lies in VRM circuits was slow.
- Click the juice: if the error is only slightly MOSFET island or something, kic presses will run normally. Pressed file that is not heavy and it is slow.
- Measure the 5V (or 2v5-> 5V) in PS-ON pin. If lost: Detect Pin PS-ON -> Chip NAM or SIO. On any guy beat that guy. (If the test chip NAM quartz source and replace the chip again try it)
- Tune in MOSFET island (or islands IC): true blue -> (through) port island (or direct) -> SIO; Dam SIO port or island.
Clock pulse generator circuit of the common mistakes and how to handle
NOTE:
Including an IC circuit and a quartz clock comes 14.3.
Just find the IC Quartz 14.3 is next to the clock IC.
Duties:
Generated 14.3 MHz quartz oscillator is 14.3 MHz standard, then the clock pulse generator circuit would get from standard quartz oscillator and then multiplied by a certain percentage to create different frequency clock pulse supply for the components of the motherboard.
Including an IC circuit and a quartz clock comes 14.3.
Just find the IC Quartz 14.3 is next to the clock IC.
Duties:
Generated 14.3 MHz quartz oscillator is 14.3 MHz standard, then the clock pulse generator circuit would get from standard quartz oscillator and then multiplied by a certain percentage to create different frequency clock pulse supply for the components of the motherboard.
SIO chip common problems and how to handle
Chip Super I / O for short SIO
How to identify:
- Rectangular, about 4 cm square have the ITE, Winbond, SMSC ... like this;
Avoid confusion with the SIO chip LAN chip onboard (same size, but he usually comes a 25 000) a few onboard sound chip has the same size but less than that. Remains the third most common type of chip should be less confusion.
Duties:
- In conjunction with NAM chipset and manage the source file for the main power off.
- Management keyboard, mouse, FDD, LPT.
How to identify:
- Rectangular, about 4 cm square have the ITE, Winbond, SMSC ... like this;
Avoid confusion with the SIO chip LAN chip onboard (same size, but he usually comes a 25 000) a few onboard sound chip has the same size but less than that. Remains the third most common type of chip should be less confusion.
Duties:
- In conjunction with NAM chipset and manage the source file for the main power off.
- Management keyboard, mouse, FDD, LPT.
South Bridge common errors and how to handle
Southbridge - South Bridge Chip (I / O Control Hub: ICH)
NOTE:
- The second largest on the main (only losing Chip North Bridge)
- There are two large chips, north bridge chip is the first chip, the rest is the southbridge
NOTE:
- The second largest on the main (only losing Chip North Bridge)
- There are two large chips, north bridge chip is the first chip, the rest is the southbridge
North bridge the common errors and how to handle
*Biggest chip on the motherboard.
*Usually add a piece of radiator.
*Located near the CPU and RAM.
Does not identify CPU (CPU not running, similar to open socket CPU)
RAM not recognized (the source case was sufficient RAM): RAM is not trying hard long Beep speaker does not beep anymore no RAM or beep continuously.
Do not get VGA (AGP source case or sufficient PIC-E) (or take onboard VGA) Main Test Report Card code 25 or 26 (good kind of course is offline card, funny card, the main new new test is 26 on any error Failed to load or what is also 26).
*Usually add a piece of radiator.
*Located near the CPU and RAM.
Does not identify CPU (CPU not running, similar to open socket CPU)
RAM not recognized (the source case was sufficient RAM): RAM is not trying hard long Beep speaker does not beep anymore no RAM or beep continuously.
Do not get VGA (AGP source case or sufficient PIC-E) (or take onboard VGA) Main Test Report Card code 25 or 26 (good kind of course is offline card, funny card, the main new new test is 26 on any error Failed to load or what is also 26).
unrecognized USB
The difference is "very important" as the keyboard and mouse PS / 2 is also managed by the SIO chip USB ports because "chipset South" by managing.
Under this scheme, we found it no different than keyboard and mouse should be damaged and treatment is quite similar to keyboard and mouse.
Under this scheme, we found it no different than keyboard and mouse should be damaged and treatment is quite similar to keyboard and mouse.
No keyboard and mouse
No keyboard and mouse
Need to distinguish communication standard keyboard and mouse are PS / 2 . There is a spare USB port or just until the port ps / 2 is omitted.
In this article I just mentioned the standard keyboard and mouse PS / 2 only.
Need to distinguish communication standard keyboard and mouse are PS / 2 . There is a spare USB port or just until the port ps / 2 is omitted.
In this article I just mentioned the standard keyboard and mouse PS / 2 only.
What is Super I / O ?
Circuit synthesis Super I / O is connected to south bridge chipset in a motherboard diagram chuSuper I / O is an integrated chip on the motherboard functions mediated communication between the south bridge chipset and interfaces periphery. Super I / O is often seen on the previous motherboard. The chip Super I / O is often used for communication with peripheral devices have low bandwidth.
Super I / O often provide at least the following functions:
The controller of the floppy drive (floppy controller)
Controller for one or two serial ports (serial port controller)
The controller for the parallel port (parallel port controller)
The actual chip Super I / O expansion also integrated other features, such a chip Super I / O is the symbol of SMC LPC47M102 on the motherboard's ATX Intel VC820 can integrate out three features as above has added the following features:
Super I / O often provide at least the following functions:
The controller of the floppy drive (floppy controller)
Controller for one or two serial ports (serial port controller)
The controller for the parallel port (parallel port controller)
The actual chip Super I / O expansion also integrated other features, such a chip Super I / O is the symbol of SMC LPC47M102 on the motherboard's ATX Intel VC820 can integrate out three features as above has added the following features:
USB buying tips
USB is one of the objects separated by any person or use a computer. However, not everyone knows the secrets to purchase this product. Here are some tips.
On the market exist two types of memory cards with two different standards are 1.1 and 2.0. Same storage capacity, but the difference in price between the two types can vary up to $ 10. USB 2.0 is faster than 1.1 speed a lot. Speed data entry of type 1.1 is 12 Mb / seconds remaining 2.0 is 480 Mbps. Typically, USB 2.0 can be distinguished on the device, packaging and documentation.
On the market exist two types of memory cards with two different standards are 1.1 and 2.0. Same storage capacity, but the difference in price between the two types can vary up to $ 10. USB 2.0 is faster than 1.1 speed a lot. Speed data entry of type 1.1 is 12 Mb / seconds remaining 2.0 is 480 Mbps. Typically, USB 2.0 can be distinguished on the device, packaging and documentation.
clear cmos password
Set CMOS password is considered one of the very effective measures to computer security. CMOS password breaking is a very difficult but not impossible. But for the successful implementation also requires you to have a "skilled" certain.
There are several ways to break the CMOS password, such as replacement BIOS chip, BIOS chip circuit, use jumper, remove the battery on the motherboard, breaking the CMOS password with a number of commands, enter the default password of the manufacturer ... but for world computing "ordinary academic" as the appliance we have two methods that can apply to be temporary.
There are several ways to break the CMOS password, such as replacement BIOS chip, BIOS chip circuit, use jumper, remove the battery on the motherboard, breaking the CMOS password with a number of commands, enter the default password of the manufacturer ... but for world computing "ordinary academic" as the appliance we have two methods that can apply to be temporary.
Recover bad sectors on your hard drive
Recover bad sectors on your hard drive
Hard life for over two years using it often fails, a number of sectors will not be used anymore, but it is often referred to as Bad sector. The cause may be because most of the hard work of instability is often called physical damage.
For this reason, the ability to recover is very low and not ordinary users can do that requires the technician to professional. They also have to mention potential damages caused by software such as viruses by vandalism, power outages while working, install and uninstall software not properly ... system will also be listed in the Bad Sector list that actually it is still used. Bad sector to get back there is no other software can make a better program of Dposoft HDD Regenerator.
Hard life for over two years using it often fails, a number of sectors will not be used anymore, but it is often referred to as Bad sector. The cause may be because most of the hard work of instability is often called physical damage.
For this reason, the ability to recover is very low and not ordinary users can do that requires the technician to professional. They also have to mention potential damages caused by software such as viruses by vandalism, power outages while working, install and uninstall software not properly ... system will also be listed in the Bad Sector list that actually it is still used. Bad sector to get back there is no other software can make a better program of Dposoft HDD Regenerator.
CRT Monitor block diagram
Light color image: a color picture signal components and integrated into a video image by scanning principle, with three monochrome images are generated on the color picture tube through which the principles of color mixing color image synthesis is displayed with full color.
Printer can not print how to do?
Here step by step for the camp to introduce the tactics to deal with the printer can not print, so hope that preventive measures, in an emergency visibility mindset, quick solution to the difficulties of the printer can not print.
First check whether the printer is online
There may be loose your power cord leading to no boot, it may be because the reasons set with the printer you do not have online. If you are using, then use the network printer, there may be other side of the computer is turned off, so you can not line up. So if you see the computer online when you are prompted, Please check the situation.
MOTHERBOARD REPAIRING STEPS
MOTHERBOARD REPAIR
maintenance informationRepair parts
Do not turn fault detection method and sequence
1. Check the working conditions of the three CPU
l Power Supply
Basic mobile phone repair tutorial
Section phone repair knowledge
1, fault classification
1, caused the causes of cell phone
(1), the menu settings failure: failure is not, strictly speaking, if no calls are perhaps for the owner to set up call forwarding; play no phone is set up outbound throttling. The baffling problem, first with total reset.
(2), using failure: improper operation generally refers to the user, dislocation caused by adjustment. More common are the following categories:
1), mechanical damage. As the operation or method of application of excessive force is not correct, resulting in mobile devices rupture, deformation, and the module pin loose weld failures and other causes. In addition, flip off axis, the antenna was broken and thrown split casing, water, broken screen, also belong to this type of failure.
1, fault classification
1, caused the causes of cell phone
(1), the menu settings failure: failure is not, strictly speaking, if no calls are perhaps for the owner to set up call forwarding; play no phone is set up outbound throttling. The baffling problem, first with total reset.
(2), using failure: improper operation generally refers to the user, dislocation caused by adjustment. More common are the following categories:
1), mechanical damage. As the operation or method of application of excessive force is not correct, resulting in mobile devices rupture, deformation, and the module pin loose weld failures and other causes. In addition, flip off axis, the antenna was broken and thrown split casing, water, broken screen, also belong to this type of failure.
ATX power supply repair tips
Failure phenomenon, no output measured and found to plug 9 feet No +5 vsb voltage, so you can not judge the work of auxiliary power.
Ic3 l7805 three-terminal regulator measuring inputs and outputs were not voltage, but sometimes there is 20v input voltage, output has 5v voltage, then short the normal voltage output pin 13-14, but then again, the short cable disconnect pass the time nor the output voltage. Auxiliary power collector voltage measurement from the multimeter instructions have been found from vibration, it was suspected that a fault in the transformer secondary winding side。 Replacement capacitor c04, disconnect l7805 input, still no voltage secondary winding, again in accordance with the power failure did not come from the vibration of the end winding from the initial search fails, found that when the switch with a multimeter measuring the collector, the voltage times be back to normal and the enhanced effect by vibration is not to find fault confidence.
Survey found that r02 has become infinite resistance, the role of this resistance is filtered rectified mains voltage into the base switch is open power from the vibration produced a prerequisite, with a 390k resistor to replace r02, troubleshooting .
Ic3 l7805 three-terminal regulator measuring inputs and outputs were not voltage, but sometimes there is 20v input voltage, output has 5v voltage, then short the normal voltage output pin 13-14, but then again, the short cable disconnect pass the time nor the output voltage. Auxiliary power collector voltage measurement from the multimeter instructions have been found from vibration, it was suspected that a fault in the transformer secondary winding side。 Replacement capacitor c04, disconnect l7805 input, still no voltage secondary winding, again in accordance with the power failure did not come from the vibration of the end winding from the initial search fails, found that when the switch with a multimeter measuring the collector, the voltage times be back to normal and the enhanced effect by vibration is not to find fault confidence.
Survey found that r02 has become infinite resistance, the role of this resistance is filtered rectified mains voltage into the base switch is open power from the vibration produced a prerequisite, with a 390k resistor to replace r02, troubleshooting .
Laptop power supply principle Explained
Notebook without power fault conditions in several ways, namely:
First, use the adapter without electricity, but the use of battery power-normal;
Second, use the adapter power-normal, but without using battery power;
Third, use the adapter and the battery can not power up.
The three failures are very common in notebook computers, in order to maintain the three failures, must have the laptop power-up process.
The following simple analysis of the notebook's power-process.
When we press the power switch after the low (or high) of PWRSW # signal triggered PC87591, PC87591 and then issued a PM-PWRBTN # signals trigger the ICH, ICH back to laptop mode PC87591 three signals (Figure in step 6), and then the main power supply notebook computers to trigger the switch, such as the main power supply, CPU power supply, etc., and then follow the steps in the diagram in power. As shown.
First, use the adapter without electricity, but the use of battery power-normal;
Second, use the adapter power-normal, but without using battery power;
Third, use the adapter and the battery can not power up.
The three failures are very common in notebook computers, in order to maintain the three failures, must have the laptop power-up process.
The following simple analysis of the notebook's power-process.
When we press the power switch after the low (or high) of PWRSW # signal triggered PC87591, PC87591 and then issued a PM-PWRBTN # signals trigger the ICH, ICH back to laptop mode PC87591 three signals (Figure in step 6), and then the main power supply notebook computers to trigger the switch, such as the main power supply, CPU power supply, etc., and then follow the steps in the diagram in power. As shown.
MOBILE PHONE SERVICING- BGA CHIP REMOVAL GUIDE
BGA chip removal and welding
1. Guide
With the rapid global development of mobile communication technology, many handset makers compete to launch new compact and powerful mobile phones. In these new phones, the widespread adoption of advanced BGAIC (Balld arrays ball grid array package), which has spread the technology can significantly reduce the volume of mobile phone, enhancements, reduced power consumption, lower production costs. But, like all things beneficial to have disadvantages, BGA package IC is easy to fall caused by Weld, and to the maintenance work led to great difficulties.
BGA packaged chips are used precision optical instrument patch installed, error is 0.01mm, while the actual maintenance work, most of the repairs were not like the SMT equipment, even with all welding hot air and feel installation, little chance of success.
1. Guide
With the rapid global development of mobile communication technology, many handset makers compete to launch new compact and powerful mobile phones. In these new phones, the widespread adoption of advanced BGAIC (Balld arrays ball grid array package), which has spread the technology can significantly reduce the volume of mobile phone, enhancements, reduced power consumption, lower production costs. But, like all things beneficial to have disadvantages, BGA package IC is easy to fall caused by Weld, and to the maintenance work led to great difficulties.
BGA packaged chips are used precision optical instrument patch installed, error is 0.01mm, while the actual maintenance work, most of the repairs were not like the SMT equipment, even with all welding hot air and feel installation, little chance of success.
BASIC ELECTRONICS-FET TESTING
As the FET structure, principle and common transistor different conditions in the amateur use multimeter to determine the method is not the same as before the test what your hands touch touch water pipe, or ground, to let go of the body's charge.
1.G pole (gate) of the judge: multimeter with R × 100 files, each FET were measured resistance between two feet (both positive and negative to the test once), there should be a pair of feet to several hundred ohms resistance (such as are high-value,
1.G pole (gate) of the judge: multimeter with R × 100 files, each FET were measured resistance between two feet (both positive and negative to the test once), there should be a pair of feet to several hundred ohms resistance (such as are high-value,
BASIC ELECTRONIC-BASIC COMPONENTS DETECTION METHODS
Components of the detection is an appliance repair basics, how to accurately and effectively detect the components of the relevant parameters to determine whether components of the normal, not a stereotyped thing, must be based on different components use different methods to determine components of normal or not. Especially for beginners, proficiency testing methods commonly used components and experience is necessary, the following test on the common experience of electronic components and test methods are introduced for the right.
1, resistor detection methods and experience:
1, resistor detection methods and experience:
BASIC ELECTRONICS- USE OF CAPACITORS
1. DC blocking: role is to stop by and let the exchange by DC.
2. Bypass (decoupling): for the exchange of circuit components in parallel to provide certain low- impedance path.
2. Bypass (decoupling): for the exchange of circuit components in parallel to provide certain low- impedance path.
Detection of laser diode
(A) determine the pin order of the multimeter to put R × 1K block, in accordance with the detection of common diode positive and negative resistance method, can be laser diode of the pin in the order determined.
EPSON C4X series printer maintenance
Printer connected to the mains, press the printer's power button when the green indicator light does not shine, the printer does not work, press the key for the red ink light is not bright, it could be the printer's power supply broke down.
The first step to take off the printer's plastic cover. Off-white plastic cover with plastic buckle 7 is connected with a gray base with a screwdriver to push up one by one plastic button, you can take off the plastic cover and then remove the paper into the frame. Connected to electricity, with a multimeter to check the availability of CN2 on the 36 V voltage , shown in Figure 2, if no voltage,
The first step to take off the printer's plastic cover. Off-white plastic cover with plastic buckle 7 is connected with a gray base with a screwdriver to push up one by one plastic button, you can take off the plastic cover and then remove the paper into the frame. Connected to electricity, with a multimeter to check the availability of CN2 on the 36 V voltage , shown in Figure 2, if no voltage,
Add Printer Tip Print Spooler service is not running solution
When this problem occurs, first check-related services have not started
In the Start - Run - CMD - SERVICES. MSC start the service component or on the desktop select "My Computer" right choice "management";
In the Start - Run - CMD - SERVICES. MSC start the service component or on the desktop select "My Computer" right choice "management";
HOW TO REPAIR COMPUTER MOTHERBOARD
MOTHERBOARD NOT BOOT
a. check whether the short circuit CPU voltage
b. MOS tube 5V and 3V voltage is normal
c. check motherboard VID0-VID5 signal
d. 12V Power Management Chip 0 ohm affect, MOS capacitor for the wrong side of the tube will affect the voltage
e. VID_GOOD signal
a. check whether the short circuit CPU voltage
b. MOS tube 5V and 3V voltage is normal
c. check motherboard VID0-VID5 signal
d. 12V Power Management Chip 0 ohm affect, MOS capacitor for the wrong side of the tube will affect the voltage
e. VID_GOOD signal
Reform yourself making mobile phone charger, USB data cable and headset
Reform yourself making mobile phone charger, USB data cable and headphones
Many reasons made cell phones for models, charger, USB data cable and earphones since the original machine can not buy the charger cable and headset, to tell you here yourself, use the other line conversion method: This method is suitable for a certain practical ability of the machine friendly, if a novice, it is recommended not to do the same action! Many domestic phone because the model because, charger, USB data cable and earphones after the original machine can not buy the charger cable and headset, to tell you here yourself, with other line conversion method: this method is suitable for a certain Friends of practical ability of the machine, if a novice, it is recommended not to do the same action!
Tools ready: Tools to prepare:
1, multimeter a 1, a multimeter
2: The full line phone socket pin plug a 2: The full line phone socket pin plug 1
3: The maintenance of a power table (need short-circuit protection) 3: The maintenance of a power table (need short-circuit protection)
Many reasons made cell phones for models, charger, USB data cable and earphones since the original machine can not buy the charger cable and headset, to tell you here yourself, use the other line conversion method: This method is suitable for a certain practical ability of the machine friendly, if a novice, it is recommended not to do the same action! Many domestic phone because the model because, charger, USB data cable and earphones after the original machine can not buy the charger cable and headset, to tell you here yourself, with other line conversion method: this method is suitable for a certain Friends of practical ability of the machine, if a novice, it is recommended not to do the same action!
Tools ready: Tools to prepare:
1, multimeter a 1, a multimeter
2: The full line phone socket pin plug a 2: The full line phone socket pin plug 1
3: The maintenance of a power table (need short-circuit protection) 3: The maintenance of a power table (need short-circuit protection)
Basic knowledge of CPU power supply circuit (switch) - revised
describes the basic knowledge of CPU power circuit. ① single-phase power circuit structure and principle * Single-phase power circuit structure and principle *
Main PWM circuit chip CPU, MOSEFT tube, inductance, capacitance of four components. Main PWM circuit chip CPU, MOSEFT tube, inductance, capacitance of four components. MOSEFT tube which is an electronic switch (such as the image above K1, K2), but the high frequency switch, second switch from 10,000 to 15,000 times. One MOSEFT tube is an electronic switch (such as the image above K1, K2), but the high frequency switch, second switch from 10,000 to 15,000 times. Inductors and capacitors from the two roles here, save energy and filtering. Inductance and capacitance from the two roles here, save energy and filtering.
Main PWM circuit chip CPU, MOSEFT tube, inductance, capacitance of four components. Main PWM circuit chip CPU, MOSEFT tube, inductance, capacitance of four components. MOSEFT tube which is an electronic switch (such as the image above K1, K2), but the high frequency switch, second switch from 10,000 to 15,000 times. One MOSEFT tube is an electronic switch (such as the image above K1, K2), but the high frequency switch, second switch from 10,000 to 15,000 times. Inductors and capacitors from the two roles here, save energy and filtering. Inductance and capacitance from the two roles here, save energy and filtering.
motherboard cable connection method
We installed a new machine when the connection will find a lot of need for connection on the motherboard. We installed a new machine when the connection will find a lot of need for connection on the motherboard. For hard drives, CD-ROM device to connect all of these are not unfamiliar. For hard drives, CD-ROM device to connect all of these are not unfamiliar. But some smaller cable or puzzled many friends, such as pre-usb cable, front audio cable, power switch, hard drive indicator light This type of cable. But some smaller cable or puzzled many friends, such as pre-usb cable, front audio cable, power switch, hard light of this type of cable. Today, computer repair network for friends summed up what so on cable connections, and I hope to you solve practical problems. Today, computer repair network for friends summed up what so on cable connections, and I hope to give you solve practical problems. (This article from the computer maintenance network) (This article is from computer repair network)
USB Interface USB Interface
USB Interface USB Interface
EPSON Stylus Printer micro-adjustment
EPSON stylus printer will print the bottom line to the second page
Causes and solutions: Causes and solutions:
Fine-tune the printer to adjust the upper and lower margins,
Causes and solutions: Causes and solutions:
Fine-tune the printer to adjust the upper and lower margins,
ALL NEW MOBILE UNLOCKING CODES
Motorola all machines lock: Press MENU +5 +1 / 2
T190 unlock code: 20010903 T190 unlock code: 20010903
T191 unlock code: 19980722 T191 unlock code: 19980722
3X8/2X88/998/8088/L2000/7689/T189/C289 such as the initial password is 1234; phone password is 000000; unlock method: If there is no test card, the first input 1234, such as the password has been changed, press the Menu key would lead to "modify the lock code", press OK key, then enter 000 000 four-digit phone password is displayed if the security code has been changed, you can only test card or software tools solution. 3X8/2X88/998/8088/L2000/7689/T189/C289 such as the initial password is 1234; phone password is 000000; unlock method: If there is no test card, the first input 1234,
T190 unlock code: 20010903 T190 unlock code: 20010903
T191 unlock code: 19980722 T191 unlock code: 19980722
3X8/2X88/998/8088/L2000/7689/T189/C289 such as the initial password is 1234; phone password is 000000; unlock method: If there is no test card, the first input 1234, such as the password has been changed, press the Menu key would lead to "modify the lock code", press OK key, then enter 000 000 four-digit phone password is displayed if the security code has been changed, you can only test card or software tools solution. 3X8/2X88/998/8088/L2000/7689/T189/C289 such as the initial password is 1234; phone password is 000000; unlock method: If there is no test card, the first input 1234,
MOTHERBOARD South bridge bad way to judge
1. Play PCI A14 of the resistance, on the ground less than 80 Euro for the South Bridge bad.
2. Standby, South Bridge hot, bad for the bridge. 2. Standby, hot south bridge, the bridge bad. (Excluding AGP supply pipe damage.) (Excluding AGP power tube is damaged.)
2. Standby, South Bridge hot, bad for the bridge. 2. Standby, hot south bridge, the bridge bad. (Excluding AGP supply pipe damage.) (Excluding AGP power tube is damaged.)
Laser printer cartridge and Toner Cartridge structures
Most brands of laser printer cartridges and powder box structure is integrated, and this part of the problem of laser printer parts most likely to understand its structure is very good for our maintenance.
1, imaging features some of the components
Photosensitive drum: is made of aluminum tube coated with selenium, the selenium material for the insulator in the dark, exposed site of the conductor. When the laser beam emitted by them came to light, to light the information matrix of dots to form a electrostatic latent image.
Drum drive gear: with the photosensitive drum at one end is fixed by the printer delivered impetus for drum rotation, while driving transfer roller rotation.
1, imaging features some of the components
Photosensitive drum: is made of aluminum tube coated with selenium, the selenium material for the insulator in the dark, exposed site of the conductor. When the laser beam emitted by them came to light, to light the information matrix of dots to form a electrostatic latent image.
Drum drive gear: with the photosensitive drum at one end is fixed by the printer delivered impetus for drum rotation, while driving transfer roller rotation.
LCD Troubleshooting Maintenance
1, PANEL (LCD)
2, A / D Driver Board;
3, LCD screen line-drive
4, high-pressure plate (also known as step-up board, high-pressure section, INVERTER)
5, high-pressure plate wire 5, high-pressure plate wire
6, Power adapter (external, generally DC 3A/12V), are also part of the display of the open
Off the power section is built into the machine, the direct input AC220V to Off the power section is built into the machine, the direct input AC220V to
7, VGA cable
8, shell
The following is based on the maintenance of our daily summary of some of the maintenance ideas:
2, A / D Driver Board;
3, LCD screen line-drive
4, high-pressure plate (also known as step-up board, high-pressure section, INVERTER)
5, high-pressure plate wire 5, high-pressure plate wire
6, Power adapter (external, generally DC 3A/12V), are also part of the display of the open
Off the power section is built into the machine, the direct input AC220V to Off the power section is built into the machine, the direct input AC220V to
7, VGA cable
8, shell
The following is based on the maintenance of our daily summary of some of the maintenance ideas:
Learn Basic UNIX commands
Basic UNIX commands
Note: not all of these are actually part of UNIX itself, and you may not find them on all UNIX machines. But they can all be used on turing in essentially the same way, by typing the command and hitting return. Note that some of these commands are different on non-Solaris machines -
If you've made a typo, the easiest thing to do is hit CTRL-u to cancel the whole line. But you can also edit the command line
UNIX is case-sensitive.
Files
• ls --- lists your files
ls -l --- lists your files in 'long format', which contains lots of useful information, e.g. the exact size of the file, who owns the file and who has the right to look at it, and when it was last modified.
ls -a --- lists all files, including the ones whose filenames begin in a dot, which you do not always want to see.
There are many more options, for example to list files by size, by date, recursively etc.
Note: not all of these are actually part of UNIX itself, and you may not find them on all UNIX machines. But they can all be used on turing in essentially the same way, by typing the command and hitting return. Note that some of these commands are different on non-Solaris machines -
If you've made a typo, the easiest thing to do is hit CTRL-u to cancel the whole line. But you can also edit the command line
UNIX is case-sensitive.
Files
• ls --- lists your files
ls -l --- lists your files in 'long format', which contains lots of useful information, e.g. the exact size of the file, who owns the file and who has the right to look at it, and when it was last modified.
ls -a --- lists all files, including the ones whose filenames begin in a dot, which you do not always want to see.
There are many more options, for example to list files by size, by date, recursively etc.
Power On Self Test Beep Codes for a specific meaning
BIOS for the Award BIOS's a short: the system start normally. BIOS for the Award BIOS's a short: the system start normally. Congratulations, your machine without any problem. Congratulations, your machine without any problem.
2 Short: General error, please enter CMOS Setup, reset the incorrect option. 2 Short: General error, please enter CMOS Setup, reset the incorrect option.
2 Short: General error, please enter CMOS Setup, reset the incorrect option. 2 Short: General error, please enter CMOS Setup, reset the incorrect option.
What is CMOS?
BIOS is stored in CMOS memory, CMOS is a complementary metal-oxide semiconductor initials of the first to write Chinese is a complementary metal-oxide semiconductor, which is a semiconductor technology that will become the right of the metal-oxide semiconductor field-effect transistor (MOSFET) integrated on a silicon chip. BIOS is stored in CMOS memory, CMOS is a complementary metal-oxide semiconductor initials of the first to write Chinese is a complementary metal-oxide semiconductor, which is a semiconductor technology that will become the right of the metal-oxide semiconductor field-effect transistor (MOSFET) integrated on a silicon chip.
Diode characteristics and applications
In almost all electronic circuits, it is necessary to use semiconductor diode, which in many circuits play an important role, it is the birth of one of the first semiconductor device, its applications are very extensive.
Diode Diode works works
Crystal diode as a p-type semiconductor and n-type semiconductor pn junction formed in its interface on both sides of the formation of space charge layer, and built self-built electric field. Crystal diode as a p-type semiconductor and n-type semiconductor pn junction formed in its interface on both sides of the formation of space charge layer,
Diode Diode works works
Crystal diode as a p-type semiconductor and n-type semiconductor pn junction formed in its interface on both sides of the formation of space charge layer, and built self-built electric field. Crystal diode as a p-type semiconductor and n-type semiconductor pn junction formed in its interface on both sides of the formation of space charge layer,
In-depth understanding of the hard disk structure
Opened an in-depth understanding of the hard disk data recovery must be preceded by the overall physical structure of the hard disk have a full understanding. As a high precision parts, hard disk external structure is relatively simple, the real high-tech body in its internal disk. As a high precision parts, hard disk external structure is relatively simple, the real high-tech content in its body within the disc.
1. The external structure of the hard disk 1. The external structure of the hard disk
Hard drive external structure is not complicated, mainly by the power supply interface, data interface, the control circuit board composition. Hard drive external structure is not complicated, mainly by the power supply interface, data interface, the control circuit board composition. For IDE hard drives, Serial-ATA hard drive, SCSI For IDE hard drives, Serial-ATA hard drive, SCSI
1. The external structure of the hard disk 1. The external structure of the hard disk
Hard drive external structure is not complicated, mainly by the power supply interface, data interface, the control circuit board composition. Hard drive external structure is not complicated, mainly by the power supply interface, data interface, the control circuit board composition. For IDE hard drives, Serial-ATA hard drive, SCSI For IDE hard drives, Serial-ATA hard drive, SCSI
CPU fan noise removal method
The most important tool as a computer cooling fan, but also because the use of high frequency, resulting in noise is increasing. Faced with this situation, you thought the noise eradicated there? Faced with this situation, you thought the noise eradicated there? Perhaps you will say the fan is not on the line of direct replacement, but in fact as long as the fans do not bad, there is no need to replace with new, old fans as long as proper maintenance, can be returned to normal. Perhaps you will say the fan is not on the line of direct replacement, but in fact as long as the fans do not bad,
Method of hard disk damage repair
1, hard disk damage test, if there part of the sector on the hard disk can not be properly read or write or visit the situation, the general was known as a bad fan (bad sector), which is commonly known as "bad sectors . "hard disk bad sectors is very complex, and some recorded in the sector by the checksum code, sector identification, address information, which do not normally lead to logical errors. Hard disk bad sector the situation is very complex, and some recorded in the sector by the checksum code, sector identification, address information, which do not normally lead to logical errors.
windows crashes, blue screen error code meaning of the whole solution of
Computer Blue Screen
0 0x0000 job is completed. 0 0x0000 job is completed.
1 0x0001 Incorrect function. 1 0x0001 Incorrect function.
2 0x0002 system can not find the file specified. 2 0x0002 system can not find the file specified.
3 0x0003 system can not find the path specified. 3 0x0003 system can not find the path specified.
4 0x0004 system can not open the file. 4 0x0004 system can not open the file.
5 0x0005 Access is denied. 5 0x0005 Access is denied.
6 0x0006 invalid code. 6 0x0006 invalid code.
7 0x0007 storage control block has been destroyed. 7 0x0007 storage control block has been destroyed.
8 0x0008 storage space, unable to process this command. 8 0x0008 storage space, unable to process this command.
0 0x0000 job is completed. 0 0x0000 job is completed.
1 0x0001 Incorrect function. 1 0x0001 Incorrect function.
2 0x0002 system can not find the file specified. 2 0x0002 system can not find the file specified.
3 0x0003 system can not find the path specified. 3 0x0003 system can not find the path specified.
4 0x0004 system can not open the file. 4 0x0004 system can not open the file.
5 0x0005 Access is denied. 5 0x0005 Access is denied.
6 0x0006 invalid code. 6 0x0006 invalid code.
7 0x0007 storage control block has been destroyed. 7 0x0007 storage control block has been destroyed.
8 0x0008 storage space, unable to process this command. 8 0x0008 storage space, unable to process this command.
SDRAM memory repair method
An SD memory maintenance practices, use multimeter measuring method of memory chips
On the motherboard and memory data pins is 64, D0-D63, in order to protect the memory data bit feet, in the D0-D63 which 64 data bits plus feet with a small resistance resistor (10 EU) threshold flow effect. On the motherboard and memory data pins is 64, D0-D63, in order to protect the memory data bit feet, in the D0-D63 which 64 data bits plus feet with a small resistance resistor (10 EU) threshold flow effect. While the test Instrument The main principle is to repeat tests with the program memory chips of each data bit pin to see if there is no breakdown or short circuit pin data bits, there is a chip's clock pin, the address pins.
On the motherboard and memory data pins is 64, D0-D63, in order to protect the memory data bit feet, in the D0-D63 which 64 data bits plus feet with a small resistance resistor (10 EU) threshold flow effect. On the motherboard and memory data pins is 64, D0-D63, in order to protect the memory data bit feet, in the D0-D63 which 64 data bits plus feet with a small resistance resistor (10 EU) threshold flow effect. While the test Instrument The main principle is to repeat tests with the program memory chips of each data bit pin to see if there is no breakdown or short circuit pin data bits, there is a chip's clock pin, the address pins.
ATX power supply of knowledge
At present, ATX power supplies are widely used in computers, compared with the AT power supply, it is more in line with "green computer" energy-saving standards,
It corresponds to the motherboard is the ATX motherboard. It corresponds to the motherboard is the ATX motherboard.
1.ATX power characteristics of 1.ATX Power Characteristics
Compared with the AT power supply, ATX power supply increases "+3.3 V, +5 VSB, PS-ON" three outputs. Compared with the AT power supply, ATX power supply increases "+3.3 V, +5 VSB, PS-ON" three outputs. Which "+3.3 V" output is mainly for the CPU use, and "+5 VSB", "PS-ON" ATX power supply output is embodied characteristics. In which "+3.3 V" output is mainly for the CPU use, and "+5 VSB", "PS-ON" while the output reflects the ATX power supply features.
It corresponds to the motherboard is the ATX motherboard. It corresponds to the motherboard is the ATX motherboard.
1.ATX power characteristics of 1.ATX Power Characteristics
Compared with the AT power supply, ATX power supply increases "+3.3 V, +5 VSB, PS-ON" three outputs. Compared with the AT power supply, ATX power supply increases "+3.3 V, +5 VSB, PS-ON" three outputs. Which "+3.3 V" output is mainly for the CPU use, and "+5 VSB", "PS-ON" ATX power supply output is embodied characteristics. In which "+3.3 V" output is mainly for the CPU use, and "+5 VSB", "PS-ON" while the output reflects the ATX power supply features.
Memory fault diagnosis and maintenance of
Computer memory is the most prone to failure of accessories one of the products, if the power is in the press box or a computer chassis alarm horn can not be repeated self, in most cases due to memory failure. While in all kinds of memory failures are basically destroyed the main memory, when we tend to lose the memory will be destroyed after a direct replacement in the side of the memory. In all kinds of memory failures are basically destroyed the main memory, when we tend to lose the memory will be destroyed after a direct replacement in the side of the memory. Because of memory compared with other cheaper parts, resulting in a lot of a friend once the machine memory problems detected, but not through any direct replacement of memory processing, resulting in great waste.
Chassis Front USB Connection
First, an overview because each USB peripheral interface able to provide +5 V500MA current, when we connected on-board USB interface, must be in strict accordance with the motherboard manual for installation. Absolutely not an error, or they will burn the motherboard or a peripheral. Definitely not an error, or they will burn the motherboard or a peripheral. I believe there are a lot of friends in the USB plug to connect front-line similar happened when the "smoking something,
Epson Stylus printer print head fault repair
Although the ink-jet printer and laser printer is currently very popular office equipment, but the stylus printer still in the financial, commercial areas such as a wide range of applications, which was mainly due to stylus printer has a low price, the use of economic, technological maturity etc., and stylus printer there are a number of specialized uses, such as printing more bills, etc. together. Of course, it also has a disadvantage that is a high failure rate, and its print head failure again of the total fault the rate of about 70%, below the print head for everyone to talk about the failure of maintenance of way. Of course, it also has a disadvantage that is a high failure rate, and its print head failure also accounted for 70% of the total failure rate of about Here's to talk to you about the repair method of print head failure.
Three main points of the motherboard repair
1, non-maintenance of electricity
1, Southbridge (electricity) 1, Southbridge (electricity)
2, I / O (power supply) 2, I / O (Power)
3, the door circuit (VCC) 3, the door circuit (VCC)
4, XY (both ends voltage) 4, XY (both ends voltage)
5, COMS battery 5, COMS battery
6, Jump (jumper cap) 2.5V-3.3V 6, Jump (jumper cap) 2.5V-3.3V
7, Power-on is not level transistor 5V 7, Power-on is not level transistor 5V
8, 5VSB 8, 5VSB
1, Southbridge (electricity) 1, Southbridge (electricity)
2, I / O (power supply) 2, I / O (Power)
3, the door circuit (VCC) 3, the door circuit (VCC)
4, XY (both ends voltage) 4, XY (both ends voltage)
5, COMS battery 5, COMS battery
6, Jump (jumper cap) 2.5V-3.3V 6, Jump (jumper cap) 2.5V-3.3V
7, Power-on is not level transistor 5V 7, Power-on is not level transistor 5V
8, 5VSB 8, 5VSB
Hard disk damage restoration
Hard disk damage restoration of hard disk is a very important part of the computer, all information and data will be stored in the hard disk, once the hard disk errors, and sometimes the loss of data than the loss of computers become obsolete as a whole even more significant. However, as computer hardware, and many people think of the hard disk is not easy to be easily damaged, can not be started once the bad is the situation, as well as people think that is very easy to identify bad sectors,
ALL KEY BOARD SHORT CUTS AND COMEN COMMANDS
F1 Help
F2 renamed F2 renamed
F3 Search for F3 Search
F4 Address F4 Address
F5 Refresh F5 refresh
F6 Switch F6 Switch
F10 Menu F10 Menu
CTRL + A Select All CTRL + A Select All
CTRL + C to copy CTRL + C to copy
CTRL + X Cut CTRL + X Cut
CTRL + V Paste CTRL + V Paste
CTRL + Z Undo CTRL + Z Undo
CTRL + O Open CTRL + O to open
F2 renamed F2 renamed
F3 Search for F3 Search
F4 Address F4 Address
F5 Refresh F5 refresh
F6 Switch F6 Switch
F10 Menu F10 Menu
CTRL + A Select All CTRL + A Select All
CTRL + C to copy CTRL + C to copy
CTRL + X Cut CTRL + X Cut
CTRL + V Paste CTRL + V Paste
CTRL + Z Undo CTRL + Z Undo
CTRL + O Open CTRL + O to open
How to enter Samsung 171S LCD factory pattern?
Boot mode, the OSD menu, the brightness and contrast values will be adjusted to 0,
how to repair bb5 contact service
problem:contact service
tools i use:
jaf w/pkey orig
ufc cable
procedure:
*info in jaf software
tools i use:
jaf w/pkey orig
ufc cable
procedure:
*info in jaf software
XP REPAIR INSTALL
XP INSTALL
1. Boot the computer using the XP CD. You may need to change the
boot order in the system BIOS. Check your system documentation
for steps to access the BIOS and change the boot order.
2. When you see the "Welcome To Setup" screen, you will see the
options below This portion of the Setup program prepares Microsoft
Windows XP to run on your computer:
1. Boot the computer using the XP CD. You may need to change the
boot order in the system BIOS. Check your system documentation
for steps to access the BIOS and change the boot order.
2. When you see the "Welcome To Setup" screen, you will see the
options below This portion of the Setup program prepares Microsoft
Windows XP to run on your computer:
Remove newfolder.exe virus
1. Cut The Supply Line
1. Search for autorun.inf file. It is a read only file so you will have to change it to normal by right clicking the file , selecting the properties and un-check the read only option
2. Open the file in notepad and delete everything and save the file.
3. Now change the file status back to read only mode so that the virus could not get access again.
4. Autorun INF: cutting the supply line
1. Search for autorun.inf file. It is a read only file so you will have to change it to normal by right clicking the file , selecting the properties and un-check the read only option
2. Open the file in notepad and delete everything and save the file.
3. Now change the file status back to read only mode so that the virus could not get access again.
4. Autorun INF: cutting the supply line
USING SONY ERICSSON SETOOL2
Setool2 Lite is a free program that will allow us to customize our phones flash and Sony Ericsson DB2020 CID49/51/52 and DB2010/DB2012 CID49/50/51/52.
NOTE: To connect in flash mode. Turn off the phone, remove and reinsert the battery without turning the phone press and hold the key "C" then connect the cable, one recognizes the phone see release "C".
Basic functions.
Unlock / Repair: Allows you to read the phone lock code, it is NOT to release the net.
Flash: To start the process of updating / flashing.
NOTE: To connect in flash mode. Turn off the phone, remove and reinsert the battery without turning the phone press and hold the key "C" then connect the cable, one recognizes the phone see release "C".
Basic functions.
Unlock / Repair: Allows you to read the phone lock code, it is NOT to release the net.
Flash: To start the process of updating / flashing.
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