service codes for samsung,hp,lexmark,brothers,dell printers

HP Laser Printer

The most common technique used in HP Laser Printer is to use cold resetting. Once cold resetting is done, the printer settings are restored to default factory levels. What needs to be kept in mind while using cold resetting is that the settings in the control panel of the printer

Motherboard routine maintenance of 23 cases

Today, more and more integrated motherboard, motherboard repair has become increasingly difficult, often using specialized digital testing equipment to complete. However, some motherboards do not require specialized common faults detection equipment, your own hands can be resolved, following are some of the most typical example of a motherboard failure repair and hope that everyone will learn the basic approach to solve the motherboard failure.

BASIC ELECTRONIS (TRANSISTOR WORKS)

Transistor is a control component, is mainly used to control the current size, in order to take as an example common-emitter (signal from the base input, the output from the collector, emitter grounded), when the base voltage UB has a slight change in when the base current IB will follow a small change in base current IB under the control of the collector current IC will be a big change, the greater the base current IB, the greater the collector current IC, On the contrary, the smaller the base current, collector current is also smaller, that is, the base current controls the collector current changes. However, the changes in collector current than the changes in base current is much greater, which is the amplification transistor. Changes in IC volume and the change in the ratio of IB is called the transistor magnification β (β = ΔIC / ΔIB, Δ, said variation.), Transistor magnification β is usually in the tens to hundreds of times.

PC Power Supply Knowledge

PC into the system, each component has a single source of power - is the power supply. Power supply must be uninterrupted for all the equipment to provide a stable, continuous current. If the excess or shortage of power supply, the connected device may not function properly, looks like the same as bad. For example, the memory can not be refreshed, resulting in data loss will lead to software errors; the CPU may be deadlock, or randomly re-start; hard disk may not turn, can not be normal processing control signals. Since so many devices and power are closely related, then the power supply as a PC system, the most important components is anything but over. Looking at statistics from the computer failures, power failures part of the total failure rate is very high percentage.

LAPTOP Inverter Fault Detection Method

LCD panel for high voltage power supply to the lamp power supply, it will transform the high-frequency DC low-voltage power supply high voltage power supply to light the lamp, belonging to power conversion devices, easy to heat, it is easier bad. There are many customer's screen dark, and incredibly anxious, thinking that bad screen, or the host goes wrong, drugs everywhere, grasping side asked did not know that that is a small high-pressure plate is broken!

Motherboard Power chip detection method

In general a bad power supply board is now a great possibility heart tablets, power broken heart pieces, CPU in general non-temperature, then you can file with the digital multimeter's diode test inductor and the earth off, if the multimeter calls out resistance on the long - words, power is a good heart piece, if the inductor to ground short circuit, motherboards, power supply part of the problem is absolutely, first regulation on the motherboard there are several take down power transistor, if the inductor is shorted, then the motherboard power supply chip is absolutely heart broken! But also regulate the power transistor is broken

Motherboard failure and Maintenance Basics

A key component of the motherboard is the computer used to connect a variety of computer equipment, the computer plays a vital role. If the board fails, your computer can not properly used. At present more and more integrated motherboard, motherboard repair has become increasingly difficult, often using specialized digital testing equipment to complete, but the control board and comprehensive maintenance technology, the rapid failure investigation board is still very necessary.

BIOS BEEP CODES

BIOS beep meaning

Here's the more common of the three kinds of BIOS (AMI BIOS, Award BIOS and Phoenix BIOS) of computer -
Cases to introduce the Power On Self Test Beep Codes for a specific meaning (on the computer BIOS to use models from the BIOS
Power On Self Test on a chip or from the information to see the words they see AMI compared with AMI BIOS; as they are
Compared to the Award characters Award BIOS).

How can I tell the computer hardware failure?

First, let's look at the computer startup process
1, stored in ROM (read-only memory) in the Bootstrap Loader program, and self-diagnostic program moved to the RAM (random access memory) in the.
2, with the Bootstrap Loader operation, stored in the auxiliary memory devices in the operating system files will be sent to RAM.

HP Laserjets -Service Mode

HP Laserjet 8000, 8100, and 8150 Series service mode

1. Hold down SELECT and JOB CANCEL while powering on the printer, until all lights are illuminated and the Display is blank. (If the Display Panel reads INTERNAL TEST at this point, the keys were released too soon. Repeat this step until successful.)

Nokia Mobile Phone Tips and tricks

These Nokia codes will work on most Nokia Mobile Phones,
Code Description
*3370# Activate Enhanced Full Rate Codec (EFR) - Your phone uses the best sound quality but talk time is reduced my approx. 5%

#3370# Deactivate Enhanced Full Rate Codec (EFR)

Canon Waste Ink Tank Reset Procedures

Canon GENERIC "S" SERIES RESET CODE
Waste Ink Counter Reset.
(1) Turn off the printer.
(2) Press and hold the RESUME button, then press and hold the POWER button.

BASIC ELECTORINC COMPONENTS(Transistors)

TRANSISTOR

. Usefulness
-A transistor is a small electronic device that can cause changes in a large electrical output signal by small changes in a small input signal.
-A transistor consists of three layers of silicon or germanium semiconductor material. Impurities are added to each layer to create a specific electrical positive or negative charged behavior.

BASIC ELECTRONIC COMPONENTS(CAPACITORS)

2.2.1. Electrolytic Capacitors (Electrochemical type capacitors)
Aluminum is used for the electrodes by using a thin oxidization membrane.
Large values of capacitance can be obtained in comparison with the size of the capacitor, because the dielectric used is very thin. The most important characteristic of electrolytic capacitors is that they have polarity,this means that it is very important which way round they are connected ,or it will burst. Make absolutely no mistakes. Generally, in the circuit diagram, the positive side is indicated by a "+" (plus) symbol.

BASIC ELECTRONIC COMPONENTS (RESISTOR)

1. Resistors:
1.1. Usefulness:
-Resistors determine the flow of current in an electrical circuit. Where there is high resistance then the flow of current is small, where the resistance is low the flow of current is large.

Fig (1) charge flow before and after passing the resistor

Top-secret information on the hard disk maintenance

The physical installation of the so-called hard disk drive physical installation, referring to the hard disk loaded into the chassis, set the jumper and then a good power line and data line process. the physical installation of the so-called hard disk drive physical installation, referring to the hard disk loaded into the chassis, set the jumper and then a good power line and data line process.

Power Interface: The host's power and this is connected to power supply to the hard disk. Power Interface: The host's power and this is connected to power supply to the hard disk. Note that "ladder" wiring direction, the direction of the error will not be inserted. Note that "ladder" wiring direction, the direction of the error will not be inserted.

How Computer Motherboard Power Supply Works

ATX12V EPS12V power supply circuits from the module to be + 12v voltage, converted to the (central processing unit, memory, chipset, etc.). Power supply module circuit from the ATX12V EPS12V get + 12v voltage, converted to the (central processing unit, memory , chipsets, etc.). This conversion is a DC-DC converter, also known as switching power supplies, as like the PC-power supply. This conversion is a DC-DC converter, also known as switching power supplies, as like the PC-power supply.

The computer does not recognize USB devices approach

1. Front USB cable connected the wrong. When the motherboard's USB cable and the chassis on the front USB port corresponds to a reversed-phase positive and negative at the time of such failures occur, which is quite dangerous, because the positive and negative anti-access USB devices are likely to make fire. So, as far as possible the rear chassis of the USB interface, but also to use fewer extension cords. Fractures may also be a problem from another USB port .

Motherboard repair - Power articles

Example 1. A PCI1600-F motherboard does not shine. First, carry out visual inspection and found that power control IC U24 (AIC1569) Table
Surface are traces of burning, welding, under U24, check the external circuit was no exception. U24 replacement after the board returned to normal. According to the user

Motherboard where bad start repair

First, to remind the user that the dust is the biggest enemy of the motherboard, one of best if we all take note of. Last time a customer to take over
A board, saying it was not bright, how do we check also check does not go wrong, and later with the IP (volatile can be good, is clean
One of the motherboard liquid) cleaning after "abnormal" disappeared completely. In order to ensure "abnormal" does not appear, the best attention to dust.

Computer Motherboard bus technology basics

Any of a microprocessor to be with the number of components and peripheral devices to connect, but if each of the various components and peripherals
Prepared respectively by a group of lines directly connected with the CPU, then the connection will be complex, even difficult to achieve.

Motherboard Power Controller Fault

The general power output controller for higher current, heat large, if the control chip, or poor quality or cooling Manifold poor
A high failure rate. As well as its surrounding long-term power supply filter capacitor for high-temperature environment, will be made because the electrolyte dry

The computer motherboard failure distribution

Computer motherboard complex, a relatively high failure rate, failure phenomena more complicated distribution is more dispersed. Are summarized as follows:
(1) a variety of cable short circuit, open circuit fault
Should not pass at a variety of cable short-circuit, the pass off at unreasonable; IC chips, resistors, capacitors, transistors, inductors and other devices yuan
Pieces of broken pins, short circuit, breakdown; connections, pins and power supply, ground short-circuit turn-on; printing plate line break, short circuit and the pad
Fall off and so on. These are common faults.

ATX power supply architecture

Black and red black and red purple color
Voltage 3.3V 3.3V GND 5V GND 5V GND 5V 5V 12V
Color black white red orange blue black green

AT structured power supply

Black and white red orange yellow blue black dark red
PG5V 5V 12V-12V GND GND GND GND-5V 5V 5V 5V

168 wire pin DIMM (Bottom view)

1 GND data cable data cable GND
2 Data Line Data Line Data Line Data Line
3 data lines VCC data cable VCC
4 Data Line Data Line Data Line Data Line
5 Data Line Data Line Data Line Data Line
GND data line 1 data line GND

Motherboard clock circuit works

Clock circuit working principle of: 3.5 the power through the diode and inductor into the divider, the divider to work, and the crystal a
Produced its oscillation, in the crystal can be seen both feet waveforms. Resistance between the crystals at 450 feet --- 700 between Europe.
On its own two feet around 1V voltage provided by the divider. Crystal feet is the sum of the frequency of regular health 14.318M.

Computer Motherboard Power Principle

Boot principle: plug in the ATX power is, there is a static 5V voltage sent to the South Bridge, the South Bridge to mention inside the ATX Power Circuit

Motherboard what the letters represent

1. L---- inductance. Inductance coil
2. C---- capacitors.
3. BC-- Chip Capacitors
4. R---- Resistors
5.9231-chip pulse-width -----

VIA Isaiah x86 Processor Architecture

Next-Generation VIA Isaiah x86 Processor Architecture
The new VIA Isaiah Architecture combines substantial increases in performance and functionality with leading power efficiency

The VIA Isaiah Architecture is a new x86 processor architecture that will deliver significant boosts to the functionality and performance of desktop, mobile and ultra mobile PCs while minimizing power requirements, saving on battery life and enabling ultra compact system designs.

Penryn family of processors

Intel Details Upcoming New Processor Generations

Marking the next step in Intel's "tick-tock" product strategy and cadence to deliver a new process technology with an enhanced microarchitecture or entirely new microarchitecture every year, Intel Corporation will begin producing its next-generation Penryn family of processors in the second half of this year. These new processors benefit from enhancements to the Intel® Core™ microarchitecture and also Intel's industry-leading 45nm Hi-k process technology with its hafnium-based high-K + metal gate transistor design, which results in higher performance and more energy-efficient processors.

AMD Opteron Processors

Next-Generation AMD Opteron™ Processors Introduced with Record OEM Design Wins and Native Quad-Core Upgrade Path

AMD Enables OEMs to Offer Quad-Core Upgradeable Platforms to Reduce Total Cost of Ownership and to Improve Performance-per-Watt in Datacenters

Sunnyvale, Calif -- August 15, 2006 --AMD (NYSE:AMD) today introduced its Next-Generation AMD Opteron™ processor family, featuring industry-leading performance-per-watt and outstanding virtualization capabilities. As the only x86 server processor with planned upgradeability to native quad-core within the same thermal design power envelope, Next-Generation AMD Opteron processors are designed to enable customers to increase computing capacity without altering datacenter infrastructure. Improving upon what already is recognized as a standard-bearer for energy-conscious microprocessor architecture design, new platforms based on Next-Generation AMD Opteron processors will be offered in record numbers from global original equipment manufacturers (OEMs).