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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.

Master-slave jumpers: the motherboard to only two IDE interfaces, each of the root terminal has three interfaces, one of which received the motherboard IDE interface, the other two, you can take two IDE devices, including hard drives, CD-ROM, DVD machines. Master-slave jumpers: the motherboard to only two IDE interfaces, each of the root terminal has three interfaces, one of which received the motherboard IDE interface, the other two, you can take two IDE devices, including hard drives, CD-ROM, DVD machines. At the same, if a connection on the next two IDE interface device, then one of which is the main dish (Master), one for slave (Slave). If a connection with the next two IDE interfaces on the device, one of which is the main dish (Master), one for slave (Slave). Whether as a master or slave will have to drive through the back of the hard disk or a "master-slave Jumper "to set up, or will not work properly. Is it as the master disk or from the hard drive or CD-ROM disk will have to back through the "master-slave jumpers" to set up, or will not work properly. Generally speaking, the hard disk jumper is set to the default the main hard drive, CD-ROM, compared with the default settings from the disk. In general, the default jumper settings hard disk-based hard drives, CD-ROM, compared with the default settings from the disk. A specific set method on a hard drive or CD-ROM drive chassis are set up instructions. Setting method of specific hard drive or CD-ROM drive chassis are set up instructions.
Data Cable: Data cable used to connect the hard disk and the motherboard IDE interface for data transmission purposes. Data Cable: Data cable used to connect the hard disk and the motherboard IDE interface for data transmission purposes. Motherboard IDE port and hard disk data line interface are 40-pin interface, while the data lines are divided into 40 lines and 80 lines of two (see below ). Motherboard IDE port and hard disk data line interface are 40-pin interface, while the data lines are divided into 40 lines and 80 lines of two (see below). 80 lines, also known as UDMA/66 hard line, mainly for Ultra ATA 66 hard drives, the increase in interference with 40 ground for isolation purposes. 80 lines, also known as UDMA/66 hard line, is mainly used for Ultra ATA 66 hard drives, the increase in interference with 40 ground for isolation purposes. Should give play to the advantages of Ultra ATA 66 hard drives, UDMA/66 hard drive line. Should give play to the advantages of Ultra ATA 66 hard drives, UDMA/66 hard drive line. Ultra ATA 33 hard drives can also be used UDMA/66 hard line, but it will not bring any benefits. Ultra ATA 33 hard drives can also be used UDMA/66 hard line, but it will not bring any benefits. Note that the direction of the hard drive data lines are divided, reverse if the hard disk will not work. Note that the direction of the hard drive data lines are divided, reverse the words of the hard disk will not work. The data line side of a red line, red line side must be the first IDE interface 1 / 21 pins connected. The data line side of a red line, red line side must be the first IDE interface 1 / 21 pins connected.
By the above mentioned set up master-slave jumpers and connected and power lines, data lines, they can be fixed to the chassis on the hard drive of the 3.5 "rack. Of course, you can first fixed, and then wiring. The level of the hard disk can be installed can also be mounted vertically, the two are the same. Some people say that the hard disk drive is mounted vertically will affect the life, this assertion is not science. but it should be noted that the level of installation exposed surface (see the circuit board side) to be down to avoid accumulation of dust. By the above mentioned set up master-slave jumpers and connected and power lines, data lines, they can be fixed to the chassis on the hard drive of the 3.5 "rack. Of course, you can first fixed , and then wiring. The level of the hard disk can be installed can also be mounted vertically, the two are the same. Some people say that the hard disk drive is mounted vertically will affect the life, this assertion is not science. but it should be noted that the level of installation exposed surface (see the circuit board side) to be down, so as to avoid accumulation of dust.
At this point, the physical installation of the hard disk you're done. At this point, the physical installation of the hard disk you're done.
Dual hard drive installation Dual hard drive installation
1, pre-installation preparation of 1, pre-installation preparation
However, mainstream 3-inch IDE hard disk drives are installed when you double-drive chassis requires an additional 3-inch mounts. However, mainstream 3-inch IDE hard disk drives are installed when you double-drive chassis requires an additional 3-inch mounts. But the majority of chassis to install only two 3-inch frame, accounting for a hard disk, floppy drive accounted for one, so they have the 5-inch Install shelf to make a fuss approach is to buy a hard drive bracket, will be installed on the bracket on the hard disk and then installed in the chassis of the 5-inch frame. However, the majority of chassis to install only two 3-inch frame, accounting for a hard drive, floppy drive accounted for one, so they make a fuss in the 5-inch rack installation, approach is to buy a hard drive bracket, will be installed on the bracket on the hard disk and then installed in the chassis The 5-inch frame.
In general, the computer power supply output power of 200W and above all, plus hard drives should be no problem. In general, the computer power supply output power of 200W and above all, plus hard drives should be no problem. But if you have installed a dual-drive high-power graphics cards and other equipment may be, we must consider the power is around 12W power can provide a further to support a hard drive, or possible system instability. But if you have installed a dual-drive high-power graphics cards and other equipment may be, we should consider whether it can provide a further power supply around 12W power to support a hard drive, or the status of system instability may occur. In addition , but also ensure that there is a spare power supply interface for the hard disk to use. Also, ensure that there is a spare power supply interface for the hard disk to use.
The vast majority of motherboards offer two IDE interfaces, which can be accessed four IDE devices, hard drives, optical drives, burners, ZIP and other equipment are occupied IDE port, install the dual-drive before you need for your new hard drive set aside a IDE port . The vast majority of motherboards offer two IDE interfaces, which can be accessed four IDE devices, hard drives, optical drives, burners, ZIP and other equipment are occupied IDE port, install the dual-drive before you need for your new hard drive set aside a IDE port. In addition, if your computer has only one IDE data cable, hurry and buy one. In addition, if your computer has only one IDE data cable, hurry and buy one.
2, dual hard drives the main, from the state to set 2, dual hard drives the main, from the state to set
Suppose your computer hard drive and a CD-ROM the original one, usually connected in the following two: Suppose your computer hard drive and a CD-ROM the original one, usually connected in the following two:
2 hard disk drives using the same cable connected to a motherboard's Primary IDE interface, fast set-based disk (Master), set to slow from the disk (Slave). 2 hard disk drives using the same cable connected to a motherboard's Primary IDE interface, fast set-based disk (Master), set to slow from the disk (Slave). CD-ROM connected to the motherboard of the Secondary IDE interface, and set up the main dish. CD-ROM connected to the motherboard of the Secondary IDE interface, and set up the main dish.
A separate fast hard drive connected to the motherboard's Primary IDE interface and set up the main disk, CD-ROM with the second hard drive connected to the motherboard's Secondary IDE interface, set up the main disk drive, hard disk-based main dish. A separate fast hard drive connected to the motherboard's Primary IDE interface and set up the main disk, CD-ROM with the second hard drive connected to the motherboard's Secondary IDE interface, set up the main disk drive, hard disk-based main dish. Often we will be a second hard drive as a backup disk only when you can consider this access method. Usually we will be only the second hard drive as a backup disk may consider this access method.
3, dual drive letter staggered installation of dual-drive solution, we will find the first hard disk (hereinafter referred to as Disk1) of the C drive or C drive, but the Disk1 disk D, the new system has turned into E drive, E drive change into the F drive ... while the second hard disk (hereinafter referred to as Disk2) of the C drive is the D drive into the new system, Disk2 the D drive, E drive etc. Logical disk drive letter on the row in the Disk1, after all. 3, dual drive letter staggered installation of dual-drive solution, we will find the first hard disk (hereinafter referred to as Disk1) of the C drive or C drive, but the Disk1 disk D, the new system has turned into E drive, E drive change into the F drive ... while the second hard disk (hereinafter referred to as Disk2) of the C drive is the D drive into the new system, Disk2 the D drive, E drive etc. Logical disk drive letter on the row in the Disk1, after all. This phenomenon is called letter staggered. This phenomenon is called letter staggered.
Letter staggered is because the MS-DOS on the hard disk made of management methods. Letter staggered is because the MS-DOS on the hard disk made of management methods. MS-DOS to the first physical hard disk of the active DOS partition is called C, the second physical hard disk of the DOS partition is called the effective activation of D, the first physical extended DOS partition the hard drive is called E, F, etc., and the remaining letters assigned to a second physical hard disk extended DOS partition. MS-DOS to the first physical hard disk of the active DOS partition is called C, the second physical hard disk of the DOS partition is called the effective activation of D, the first physical hard disk extended DOS partition is called E, F, etc ., the allocation of the remaining letters in to the second physical hard disk extended DOS partition. If there is no a second physical hard disk, or a second physical hard disk, there is no basic DOS partition, then the D on the allocation of a physical hard disk to the first extension of DOS The first partition has a logical drive. If there is no a second physical hard disk, or a second physical hard disk, there is no basic DOS partition, then the D would be allocated to the first physical hard disk extended DOS partition of the first logical drive.
Letter would have staggered the phenomenon of a series of questions, the most common is the drive letter changes in some software because of the path leading to the error. Letter would have staggered the phenomenon of a series of questions, the most common is the drive letter changes in some software because of the path leading to the error. To avoid the phenomenon of disk interleaving, for Windows 95/98 systems, the simplest way is to use its "plug and play" feature. To avoid the phenomenon of disk interleaving, for Windows 95/98 systems, the simplest way is to use its "plug and play" feature. That will be the second hard drive in the BIOS set to None, the boot after Windows 95 starts, Windows 95 / 98 "plug and play" function can be prompted to detect the new hardware and automatically assigned the drive letter to it, this time the distribution of drive letter and a lot of people's expectations on the line of the. Namely, the BIOS will set the second hard drive None, after booting Windows 95 starts, Windows 95/98 's "Plug and Play" function can be prompted to detect the new hardware and automatically assigned the drive letter to it, this time set the distribution of characters and a lot of people's expectations on the line of the. As the original owners of all the software on the hard disk where the letter did not change, so the software on the hard disk can be run as usual, letter interlacing problems solved. As the original owners of all the software on the hard disk where the letter did not change, so the software on the hard disk can be run as usual, letter interlacing problems solved.

the system boot process the system boot process composed mainly of what a few steps (in the hard disk to start as an example): Chapter V the system boot process the system boot process composed mainly of what a few steps (in the hard disk to start as an example ):
1. Boot 2. BIOS Power On Self Test (Power On Self Test - POST), the memory address of 0ffff: 0000 1. Boot 2. BIOS Power On Self Test (Power On Self Test - POST), the memory address 0ffff: 0000
3. Will be the first sector of the hard disk (0 0 1 sector, which is BootSector) read into memory address 0000:7 c00 Department. 3. Will be the first sector of the hard disk (0 0 1 sector, which is BootSector ) is read into memory at address 0000:7 c00.
4. Check (WORD) 0000:7 dfe is equal to 0xaa55, if not equal, then turn to try the other boot media, if no other boot media, showed "No ROM BASIC" and then crashes. 4. Check (WORD) 0000:7 dfe is equal to 0xaa55, if not equal, then turn to try the other boot media, if no other boot media, showed "No ROM BASIC" and then crashes.
5. Jump to 0000:7 c00 at the implementation of MBR in the process. 5. Jump to 0000:7 c00 at the implementation of MBR in the process.
6. MBR will first copy itself to 00000, and then continue. 6. MBR will first copy itself to 00000, and then continue.
7. In the primary partition table in the search flag as active partition. If you find that there is no active partition or have more than one active partition, then the transfer to stop. 7. In the primary partition table in the search flag as active partition. If you find that there is no active partition or have more than one active partition, then the transfer stops.
8. The active partition's first sector is read into memory address 0000:7 c00 Department. 8. The active partition's first sector is read into memory at address 0000:7 c00.
9. Inspection (WORD) 0000:7 dfe is equal to 0xaa55, if not equal to the show "Missing Operating System" and then stop, or try a floppy disk to start. 9. Inspection (WORD) 0000:7 dfe is equal to 0xaa55, if not equal to the show "Missing Operating System" and then stop, or try a floppy disk to start.
10. Jump to 0000:7 c00 Office continued to implement a specific system startup procedure. 10. Jump to 0000:7 c00 Office continued to implement a specific system startup procedure.
11. Start System ... 11. Start System ...
The above steps 2,3,4,5 step is guided by the BIOS from the MBR process is complete .6,7,8,9,10 step in the boot process is complete. The above steps 2,3,4,5 step is guided by the BIOS from the MBR process is complete .6,7,8,9,10 step in the boot process is complete.
General multi-system boot procedures (such as SmartFDISK, BootStar, PQBoot, etc.) are the standard master boot record will be replaced by your own boot process, before the proceedings can run the system allows users to select the boot partition. General multi-system boot procedures (such as SmartFDISK, BootStar, PQBoot, etc.) are the standard master boot record will be replaced by your own boot process, before the proceedings can run the system allows users to select the boot partition.
The system comes with some multi-system boot program (such as lilo, NT Loader, etc.) you can program your own boot partition on the system in which the first sector, in Linux, namely, SuperBlock (In fact, the two SuperBlock a sector). The system comes with some multi-system boot program (such as lilo, NT Loader, etc.) you can program your own boot partition on the system in which the first sector, in Linux, namely, SuperBlock (In fact, the two SuperBlock a sector).
Note: The above steps are using a standard MBR, other multi-system boot process and boot process is different. Note: The above steps are using a standard MBR, other multi-system boot process boot process is different.



A hard drive brand, Seagate (seagate) Chapter VI a hard drive brand, Seagate (seagate)
Seagate is also the world's leading manufacturers of hard drives, and its market launch Jaguar scsi hard drives (15,000 rpm) up to now also occupy the top positions, so that manufacturers, the strength of course, no doubt. Seagate is also the world's leading manufacturers of hard drives, and its market launch Jaguar scsi hard drives (15,000 rpm) up to now also occupy the top positions, so that manufacturers, the strength of course, no doubt. Did the first 7200 The ide hard drive is Seagate's first manufactured, but because technology is still not very mature, resulting in excessive heat and high repair rate, of course, this does not prevent the Seagate ide into the pace of the market, followed by Seagate has launched the Barracuda as well as the Barracuda ii generation 7200 ide hard drive in one fell swoop into the market leader. Did the first 7200 rpm ide hard drive is Seagate's first manufactured, but because technology is still not very mature, resulting in excessive heat and high repair rate, of course, this does not prevent the Seagate ide into the pace of the market, followed by Seagate company also launched the Barracuda and the Cuda ii generation of 7200 ide hard drive in one fell swoop into the market leader. Its main products are 5400, 512k cache u10 series and the 7200 transfer, 2m cache Barracuda ii series, u10 series of the market retail price of 10g/15g/20g--700/740/840; Barracuda ii on behalf of the family drives the most compelling is that it was a relatively high average seek time, once reached 7.6 ms! Its main products are 5400, 512k cache u10 series and the 7200 transfer, 2m cache Barracuda ii series, u10 series of market retail price of 10g/15g/20g--700/740/840; Barracuda ii-generation hard drives The most striking is that it was a relatively high average seek time, once reached 7.6 ms! this record so far in the ide hard drive market, no one can compare. The record so far in the ide hard drive market, no one can compare. Barracuda ii series price 10g/15g/20g-- 830/940/1110, domestic agents are Kwong Yuen line. Barracuda ii series of price 10g/15g/20g-- 830/940/1110, domestic agents are Kwong Yuen line. Seagate hard drives advantage lies in its low-priced, with low-grade models than the Quantum on the dozens or even hundreds of blocks money, and for this reason that Seagate hard drives to become the preferred solution for low-cost computers. Seagate hard drives advantage lies in its low-priced, with low-grade models than the Quantum on the dozens or even hundreds of dollars, for this reason that Seagate hard drives to become the preferred solution for low-cost computers. There is also cool fish ii generation of high-speed seek, in the random data transmission than the other types of hard drives a lot faster. There is also Cuda ii generation of high-speed seek, in the random data transmission than the other types of hard drives a lot faster. Drawback is the noise, fever, are very unsatisfactory, but overclocking is almost zero, which makes a number of Overclocking enthusiasts this prohibitive. The disadvantage is that the noise, fever, are very unsatisfactory, but overclocking is almost zero, which makes a number of overclocking enthusiasts have prohibitive.
Second, Maxtor (maxtor) Second, Maxtor (maxtor)
And compared with Quantum and Seagate, Maxtor entered the domestic market, time to count later, but the Maxtor is the most attention to the China market hard disk vendors. And compared with Quantum and Seagate, Maxtor entered the domestic market, time to count later, but the Maxtor is the most attention to the China market hard disk vendors. Maxtor distributor in mainland China is the Grand electronics, all of the Maxtor hard drive Whatever the model, instead using the paper box + plastic foam packaging, packaging and printing are also more beautiful, box also comes with manual, warranty card and a series of accessories. Maxtor distributor in mainland China is the Grand electronics, no matter what all the Maxtor hard drive models, instead using the paper box + plastic foam packaging, packaging and printing are also more beautiful, box also comes with manual, warranty card and a series of accessories. Maxtor DiamondMax hard drives are the fourth generation mainstream products, DiamondMax Five Dynasties, DiamondMax six generations, Jinzuanqidai, as well as diamonds generation, second generation, third generation, DiamondMax generation, second generation, third generation, purchase a certain Grand electronic counter to go buy it, it will not be fooled. Maxtor DiamondMax hard drives are four generations of mainstream products, DiamondMax Five Dynasties, DiamondMax six generations, Jinzuanqidai, as well as diamonds generation, second generation, third generation, DiamondMax generation, second generation, third generation, the purchase must go Rand electronic counter to buy, it will not be fooled. Maxtor hard drive advantage is its excellent after-sales service, and four generations of DiamondMax noise and heat in the very excellent and disadvantages with the Seagate hard drives, overclocking performance, almost no, but in general Maxtor hard drives are relatively quite satisfactory in all respects, prices are more reasonable, if the hard disk performance, no specific requirement, then the Maxtor hard drive is indeed a good choice. Maxtor hard drive advantage is its excellent after-sales service, and four generations of DiamondMax noise and heat in the very excellent and disadvantages with the Seagate hard drives, overclocking performance, almost no, but the general Maxtor hard drive in all respects more acceptable, more reasonable price also, if the hard disk performance, no specific requirement, then the Maxtor hard drive is indeed a good choice. (now there is only a Maxtor hard drive warranty dare to promise three years, I believe that this is still very good ) (Now there is only a Maxtor hard drive warranty dare to promise three years, I believe that this is still very good)
3, ibm 3, ibm
I do not know, I am afraid that no one talking about ibm Wurenbuxiao, the Big Blue has many legends, and then the first hard drive is a ibm first manufactured; ibm hard drive first using the gmr (giant magneto-resistive heads ); ibm hard drive first to a single platter capacity of up to 10g, 15g, 20g ... ...; ibm hard drive is the only body in the next five disc mounted hard drive; ibm is the only 7200 5400 Hard Disk film separated from the production of hard disk manufacturers ... ... the current mainstream products ibm hard drive 5400 rpm, 512k cache 40gv series and the 7200 switch, 2m cache 75gxp series, but the former is 20g per platter, the latter is a single platter 15g, in Transfer speed slightly better than the other brands, but price is not expensive, 40gv series is currently only 20g a common model, quote 680, 75gxp series with 15g and 30g two models, the price of 1000 yuan and 1640 respectively, yuan. I do not know, I am afraid that no one talking about ibm Wurenbuxiao, the Big Blue has many legends, and then the first hard drive is a ibm first manufactured; ibm hard drive first using the gmr (giant magneto-resistive heads); ibm hard drive first to a single platter capacity of up to 10g, 15g, 20g ... ...; ibm hard drive is the only body in the next five disc mounted hard drive; ibm is the only 7200 5400 Hard Disk film separated from the production of hard disk manufacturers ... ... the current mainstream products ibm hard drive 5400 rpm, 512k cache 40gv series and the 7200 switch, 2m cache 75gxp series, but the former is 20g per platter, the latter is a single platter 15g, in Transfer speed slightly better than the other brands, but price is not expensive, 40gv series is currently only 20g a common model, quote 680, 75gxp series with 15g and 30g two models, the price of 1000 yuan and 1640 respectively, yuan. ibm hard drive has the advantage of advanced technologies, many advanced technologies are often the first to use ibm hard drive, its price is also very good, especially worth mentioning is the ibm hard drive decent overclocking performance, second only to Quantum, and the abroad tend to be more bullish for overclocking ibm hard drive, its overclocking performance is obvious. ibm hard drive has the advantage of advanced technologies, many advanced technologies are often the first to use ibm hard drive, its price is also very good, especially worth mentioning is the ibm hard drive decent overclocking performance, second only to Quantum, but also abroad , for the are often more optimistic about overclocking ibm hard drive, its overclocking performance is obvious. drawback is the lack of low-end market for the small-capacity hard disk, the minimum is 15g, and often lost a lot of cheap computers in the market. Drawback is the lack of low-end market for the small-capacity hard disk, the minimum is 15g, and often lost a lot of cheap computers in the market. There are several brands, such as Fujitsu, Western Digital, Samsung, etc., its products are each unique, but because the market share is small, not readily available, in this will not repeat them here. There are several brands, such as Fujitsu, Western Digital, Samsung and so on, their products have their own uniqueness, but because the market share is small, not readily available, in this will not repeat them here.


of the drive circuit board testing and repair techniques drive circuit board testing and repair techniques hard drive failure analysis and processing steps outlined below only the physical failure analysis and the general processing steps: short circuit, the need for further examination. Chapter VII of the drive circuit board testing and repair techniques drive circuit board testing and repair techniques hard drive failure analysis and processing steps outlined below only the physical failure analysis and the general processing steps: short circuit, the need for further examination.
CMOS SETUP ① first checks whether the missing hard drive configuration information. CMOS SETUP ① first checks whether the missing hard drive configuration information. Measuring circuit on the motherboard COMS RAM whether the battery is faulty, or components (such as diodes, transistors, resistors, capacitors, etc.) causes damage to the CMOS configuration parameters in the hard disk error . Measuring circuit on the motherboard COMS RAM whether the battery is faulty, or components (such as diodes, transistors, resistors, capacitors, etc.) Can cause damage to the CMOS configuration parameters in the hard disk error.
② through the power-self-test, if the screen displays an error message "Hard Disk Error", shows the hard disk is indeed faulty. ② through the power-self-test, if the screen displays an error message "Hard Disk Error", shows the hard disk is indeed faulty. Or the hard disk is not plugged. Or the hard drive is not plugged.
③ shutdown, open the lid, measuring +5 V, +12 V power supply is normal, the power box fan is rotating. ③ shutdown, open the lid, measuring +5 V, +12 V power supply is normal, the power box fan is rotating. In order to determine whether the lack of electricity outside the circuit. In order to determine whether the lack of electricity outside the circuit.
④ Check the signal cable, plug is plugged in, with or without insert anti-or their connections. ④ Check the signal cable, plug is plugged in, with or without insert anti-or their connections. May try to exchange some cable plugs a try. May try to exchange some cable plugs a try.
⑤ use of "alternative method" to determine the fault components. ⑤ use of "alternative method" to determine the fault components. Looking for a good hard drive with the comparison to determine the motherboard or the hard drive itself is a problem. Hard to find a good comparison with the hard drive to determine the motherboard or the hard drive itself is a problem.
The above steps, users will need a careful inspection, testing, analysis, identify the bad component repairs. The above steps, users will need a careful inspection, testing, analysis, identify the bad component repairs.
After the above treatment, as long as the body itself is not a hard disk is damaged, just a general poor contact connectors or external electrical fault was quickly ruled out the majority. After the above treatment, as long as the body itself is not a hard disk is damaged, just a general poor contact connectors or external electrical fault was quickly ruled out the majority.
Measuring resistance method of the measurement method is generally used multimeter resistance range measuring parts or components, resistance, according to the size of its resistance, or off, and to analyze the circuit in the cause of the malfunction. Measuring resistance method of the measurement method is generally used multimeter resistance range measuring parts or components, resistance, according to the size of its resistance, or off, and to analyze the circuit in the cause of the malfunction. The general components or parts of the input pin and output pins to ground or to the power supply has a certain amount of resistance, with ordinary multimeter measurements, there are many cases will arise are pumping resistance is small, the reverse situation of a large resistance. General components or components of the input pins and output pins to ground or to the power supply has a certain amount of resistance, with ordinary multimeter measurements, there are many cases will arise are pumping resistance is small, the reverse situation of a large resistance. generally positive resistance in the tens of ohms to 100 ohms, while the reverse resistance of more than several hundred ohms. Generally positive resistance in the tens of ohms to 100 ohms, while the reverse resistance of more than several hundred ohms. But the positive resistance will never be equal to 0 or near 0, the reverse resistance will not be infinite, otherwise we should doubt the pin Are there short-circuit or open circuit situation. However, positive resistance will never be equal to 0 or near 0, the reverse resistance will not be infinite, otherwise we should doubt whether there are short-circuit or open circuit pin situation. When the hard disk subsystem failure was determined in a plate card or a few chips, then the resistance method can be used to find out. When the hard disk subsystem failure is determined at a board or a few chips, then the resistance method can be used to find out. Shut down power outage, and then measuring device or board off, open circuit short circuit, resistance size, etc., as to determine the point of failure. Shut down power outage, and then measuring device or board off, open circuit short circuit, resistance size, etc., In order to determine the point of failure. If the measurement of hard drive stepper motor windings of the DC resistance of 24 in Europe, then in line with nominal value is normal; 10 around Europe for the partial short circuit; 0 Europe, or Europe for a few short-circuit winding burn. If the measurement of hard drive stepper motor windings of the DC resistance of 24 in Europe, then in line with a nominal value is normal; 10 around Europe for the partial short circuit; 0 Europe, or Europe for a few short-circuit winding burn .
Of the hard drive flat cable signal line commonly used to measure on-off method. Of the hard drive flat cable signal line commonly used to measure on-off method. The hard disk can unplug the power cord of a single measurement is also available on-line and measured ground resistance; if infinite, for the circuit; if resistance is less than 10 Europe should be suspected of partial measurement voltage law, the measurements are in Canada because they are afraid the circumstances, the multimeter measure the various parts or components, pin-to-ground voltage between the size of it with the logic diagram or other reference point of political parties voltage value for comparison. Unplug the power cord can drive a single measurement is also available on-line and measured ground resistance; if infinite, for the circuit; if resistance is less than 10 in Europe, should be suspected of partial measurement voltage law, the measurements are in Canada because they are afraid circumstances, the multimeter measure the various parts or components, pin-to-ground voltage between the size of it with the logic diagram, or other political parties in the voltage reference point for comparison. If the voltage value with the normal reference value the difference between the larger, then the frog of the faulty parts or components; if the voltage is normal, indicating that part of the intact, can be transferred to other parts or components of tests. If the voltage difference between the normal reference value larger then the frog of the faulty parts or components; if the voltage is normal, indicating that part of the intact, can be transferred to other parts or components of tests. Usually with the floppy disk drive power plug line, as were four head-to +12 V, +5 V,-5V and ground. The general power and floppy drive plug-line, as were four head-to +12 V, +5 V,-5V and ground. Drive stepper motors rated voltage of +12 V. Hard drive stepper motor rated voltage of +12 V. When the hard disk to start current, when the power regulator bad (for voltages from 12V down to 10.5V), will cause instability or difficulty in starting speed. Hard start current, when the power regulator bad (for voltages from 12V down to 10.5V), will cause instability or difficulty in starting speed. Ⅰ / O channel expansion slot on the system board power supply voltage of +12 V,-12V, +5 V and-5V. Ⅰ / O channel expansion slot on the system board power supply voltage of +12 V,-12V, +5 V and-5V. Board of the high signal voltage should be larger than 2.5V, low-level should be less than 0.5V . The high-board signal voltage should be larger than 2.5V, low-level should be less than 0.5V. The hard drive plugs and sockets in accordance with the arrangement of pins have a voltage meter, high at between 2.5-3.0V. The hard drive plugs and sockets in accordance with the arrangement of pins have a voltage meter, high at between 2.5-3.0V. If the high output is less than 3V, low output level is greater than 0.6V shall be failures. If the high output is less than 3V, low output level is greater than 0.6V shall be failures. Logic is impulsive wave measurement devices available test measurements or estimates of logical pen. Logic is impulsive wave measurement devices available test measurements or estimates of logical pen.
Measured short-circuit current method if there are localized phenomena, then the short-circuit heating element will heat up and may cause fuse fuse. Measured short-circuit current method if there are localized phenomena, then the short-circuit heating element will heat up and may cause fuse fuse. Multimeter string into the fault line would be to verify whether the current is more than normal. Multimeter in series with the fault line, check whether the current is more than normal. Hard disk drive adapter card, the chip will cause the system to analysis of short-circuit load current increase, drive motor short-circuit or a short drive will lead to the host power failure. Hard disk drive adapter card, the chip will cause the system to analysis of short-circuit load current increase, drive motor short-circuit or a short drive will lead to the host power failure. Drive +12 V power supply operating current should be 1.1A about. HDD Power Supply +12 V operating current should be around 1.1A. When the load current to increase the hard drive when the hard disk will start the good times and bad. When the load current to increase the hard drive when the hard disk will start the good times and bad. Electrical short circuit or load over-current range from insurance, fuse, re-have resulted in the power block, switch to adjust pipe damage. Electrical short circuit or load over-current range from insurance, fuse, re-have resulted in the power block, switch to adjust pipe damage. Increase the current loop in the string of inflow can be measured off the load. Increase the current loop in the string of inflow can be measured off the load. If the insurance line, you can disconnect the fuse into a string to measure the table. If the insurance line, you can disconnect the fuse into a string to measure the table. In the printed board of a chip's power cord can be used burin or section hacksaw cut the string of copper wire into the parking meter measurements. In the printed board of a chip's power cord can be used burin or section hacksaw cut the string of copper wire into the parking meter measurements. Electrical plug, power plug from the card out of his mouth since the power cord into the string table measurements. Electrical plug, power plug from the card out of his mouth since the power cord into the string table measurements.


QT repair techniques Fireball LM series of circuit boards, circuit board repair experience fireball LM series are LM, KA, KX models, LM heat of the chips is also very high, and also high voltage power supply is also more complex. QT repair techniques Fireball LM series of circuit boards, circuit board repair experience fireball LM series are LM, KA, KX models, LM heat of the chips is also very high, and also high voltage power supply is also more complex. Chip design my own that can be considered to be, though will be burned, but not fast Philips bad. Chip design, I personally think that can be considered to be, though will be burned, but not fast Philips bad. Circuit board design good, bad driver chips, and next to the components also to suffer! Circuit board design good, bad driver chips, and next to the components also to suffer!! !! !! ! Driver chip if broken, will produce other components of burnout, it is bad, then one bad components are: three 22 ohm resistor will be bad, but the resistance is broken, is hard to get replaced, according to the parallel resistance law, obtained three resistors in parallel with 6.7 Europe a 1/8W resistor can be replaced, the coil will easily rotten, but also difficult to find be replaced, the two inductors can be replaced LE board. Driver IC is broken, then the other components will have burned, its bad, then one bad components are: three 22 ohm resistor will be bad, but the resistance is broken, is hard to get replaced, according to the parallel resistance method obtained three resistors in parallel with 6.7 Europe a 1/8W resistor can be replaced, the coil will easily rotten, but also difficult to find be replaced, the two inductors can be replaced LE board.
1: a long bright light, the main chip bad. 1: a long bright light, the main chip bad.
2: chip-on-play drive, the head controller chip is broken or a bad power supply, transformer pairs of transistor breakdown. 2: chip-on-play drive, the head controller chip is broken or a bad power supply, transformer pairs of transistor breakdown.
3: After the light switch plate lights, in order to cache bad. 3: After the light switch plate lights, in order to cache bad.
4: light does not shine, on-board power supply voltage: 12V, 3.3V, 8V, not a bad driver chips, crystal, head control chip short-circuit, the main chip bad. 4: light does not shine, on-board power supply voltage: 12V, 3.3V, 8V, not a bad driver chips, crystal, head control chip short-circuit, the main chip bad.
5: light bright look, not turn, driver chips bad, the main chip, access to undesirable or bad. 5: light bright look, not turn, driver chips bad, the main chip, access to undesirable or bad.
6: indicator light 5, the cache being exposed or cache the bad, the main chip, access to undesirable or bad. 6: indicator light 5, the cache being exposed or cache the bad, the main chip, access to undesirable or bad.
7: All normal, including the voice of the hard drive seeks normal and can not find the disk-based chip, a bad motherboard. 7: All normal, including the voice of the hard drive seeks normal and can not find the disk-based chip, a bad motherboard. (Note that the main chip, leading to the IDE port for damage resistance.) (Note that the main chip, leading to the IDE port resistance for damage.)

Fireball Fireball AS circuit board repair disk 7200, 2M cache, there are two: one for the AS series, another way for the LM, KA, KX series. Fireball Fireball AS circuit board repair disk 7200, 2M cache, there are two: one for the AS series, another way for the LM, KA, KX series. Driver chips are used in ST companies. ST driver chips are used in the company. Models, the non-substitution. Models, the non-substitution. The latter the former is relatively good repair circuit boards more. The former board of the latter is relatively more good repair.
AS the plate in 7200 to switch state, the driver chip's heavy workload, heat, high, and also high voltage, AS board power supply also are complex. AS the plate in 7200 to switch state, the driver chip's heavy workload, heat, high, and also high voltage, AS board power supply also are complex.
Driver IC failures are caused by: not turn, does not shine, idling, playing disc. Driver IC failures are caused by: not turn, does not shine, idling, playing disc.
As the circuit board than the LCT series of thick, small. As the circuit board than the LCT series of thick, small. It is generally not appear cold solder joint, giving rise to the failure are: flash, seek not entirely, playing disk, does not shine, does not recognize disk, admit parameters, after the lights turn and so on. It is generally not appear cold solder joint, giving rise to the failure are: flash, seek not entirely, playing disk, does not shine, does not recognize disk, admit parameters, turn after turn off the lights and so on.
Fireball AS board next to the common problem is that the transistor driver chip burned, but will be replaced burning, but also difficult to find substitution of the transistor. Fireball AS board next to the common problem is that the transistor driver chip burned, but will be replaced burning, but also difficult to find substitution of the transistor.
Driver IC model is L6279 V2.4, and the L6279 V2.0 is not common, but many maintenance personnel are not seen L6279 V2.0. Driver IC model is L6279 V2.4, and the L6279 V2.0 is not common, but many maintenance personnel are not seen L6279 V2.0. Driver chip is small, but designed to be relatively stable, and driver chips in general do not appear like a fly Lipp burned so grave. Driver chip is small, but designed to be relatively stable, and driver chips in general do not appear like the Philips burned so grave. But next to the small components are easier to bad, next to the burned-out transistor is the first to be affected. But next to the small components are easier to bad, next to the burned-out transistor is the first to be affected. It is bad, then at the same time would have burned along with the other components, so to will also be burned directly to replace. It is bad, then at the same time would have burned along with the other components, so to will also be burned directly to replace. It is bad situation, bad elements will also include: 470 of the inductor, 8V power supply IC , the driver is also possible, but relatively small. It is bad situation, bad elements will also include: 470 of the inductor, 8V power supply IC, driving is also possible, but relatively small. A minor burn to stretch the family to stay put on a good, and serious burns it first Check the circuit has. Replaced by a minor burn to stretch the family to stay well, serious burns it is to test the circuit has. To see if there are no other bad, if not enough, it may be PCB board is broken. To see if there are no other bad, if not enough, it may be PCB board is broken.
Fireball CR / EX / EL circuit board repair Fireball CR / EX circuit boards used in hard disk drive chip model AN8427FBP, TDA5147BH, with the ST / SE's AN8426FBP, TDA5247CH driver chip is different from non-substitution. Fireball CR / EX / EL circuit board repair Fireball CR / EX circuit boards used in hard disk drive chip model AN8427FBP, TDA5147BH, with the ST / SE's AN8426FBP, TDA5247CH driver chip is different from non-substitution. AN8427FBP, TDA5147BH have a high temperature and high pressure characteristics, chip relatively stable, under normal circumstances will not be easy to burn, but the main circuit board to be the most likely bad chip, but the components of the. AN8427FBP, TDA5147BH have the characteristics of high temperature and high pressure, chip relatively stable, under normal circumstances will not be easy to burn, but the main circuit board to be the most likely bad chip, but the components of the. Disc usage time Long after the temperature rises, the main chip, the more prone to the phenomenon of internal short-circuit, resulting in an operating voltage of 3.3V and then re-load, operating voltage instability. Disc a long time after the use of higher temperatures, the main chip, the more prone to the phenomenon of internal short-circuit, resulting in an operating voltage of 3.3V and then re-load, operating voltage instability. The worst case, can also cause head control chip and the cache is damaged, CR will be to 3.3V power supply control board burn out. The worst case, can also cause head damage control chip and the cache, CR will be to 3.3V power supply control board burn out.
CR / EX / EL board working voltage: 12V, 5V, 8V, 3.3V. CR / EX / EL board working voltage: 12V, 5V, 8V, 3.3V. Common problems: Common problems are:
1: light long-liang, the main chip is broken. 1: light long-liang, the main chip is broken.
2: indicator light look, and driver chips break down or become the main chip is broken three: indicator light 5, the cache being exposed, or bad, the main chip being exposed, or bad 4: indicator light 6, the head controller chip is broken or the 8V operating voltage without voltage. 2: indicator light look, and driver chips break down or become the main chip is broken three: indicator light 5, the cache being exposed, or bad, the main chip being exposed, or bad 4: indicator light 6, the head controller chip is broken or the 8V operating voltage without voltage.
5: light does not shine, working voltage is not normal, the main chip, bad, bad crystal, and driver chips bad. 5: light does not shine, working voltage is not normal, the main chip, bad, bad crystal, and driver chips bad.
***** Main chip in the foot small, welding welding technology to be high and patience ** ***** Main chip in the foot small, welding welding technology to be high and patience **

Fireball LCT circuit board repair Fireball LCT series of circuit boards used in driver chips TDA5247/AN8428. Fireball LCT circuit board repair Fireball LCT series of circuit boards used in driver chips TDA5247/AN8428. TDA5247 chip, high-temperature and high pressure characteristics of special difference. TDA5247 chip high-temperature and high pressure characteristics of special difference. And even some will not take half an hour, and durable and very little. Some even will not take half an hour, and durable and very little. Therefore, TDA5247 chip low prices. Therefore, TDA5247 chip, low prices. AN8428 chip is a chip produced by Matsushita of Japan, with high temperature and high pressure to spend a few years will not be bad, can be said that LCT Series driver IC boutique, but the price higher. AN8428 chip is produced by Matsushita of Japan chips, with a high temperature and high pressure to spend a few years will not be bad, can be said that LCT Series driver IC boutique, but the price higher. But when the market is accounted for on the TDA5427 chip majority. But when the market is still on the TDA5427 chip in the majority. Put on a good Philips chip, you still will not be diverted for maintenance fireball circuit board more frequently asked questions. Replaced after a good chip or not to transfer Philips is the maintenance of the more common fireball circuit board problem. General maintenance personnel would encounter such a problem. General maintenance personnel would encounter such a problem.
1: Welding inappropriate, as well as the feet of their connections and need to use soldering iron plus solder, can also be used again blowing hot air gun. 1: Welding inappropriate, as well as the feet of their connections and need to use soldering iron plus solder, can also be used again blowing hot air gun. But it is best when the first blowing chips or rosin paste with pine fragrance, this will increase welding effect. It could best be blowing when the first chip with pine perfume or rosin paste, which will improve welding results.
2: "exclusion" burn, available multimeter check the resistance of its value, and bad. 2: "exclusion" burn, available multimeter check the resistance of its value, and bad. For! Change!
III: 56,57 feet chip circuit board contacts have been burned bad. III: 56,57 feet chip circuit board contacts have been burned bad. This is a common failure, need to external cable connection, not connected it will have produced the phenomenon of transfer. It is also a common failure, need to external cable connection, not connected it will have produced the phenomenon of transfer.
4: Electrical interface next to the discharge transistor (diode only play the role of) the breakdown of components or receive 50-70 feet lost or broken. 4: Electrical interface next to the discharge transistor (diode only play the role of) the breakdown of components or receive 50-70 feet lost or broken. But it usually can not afford to turn failures. But this generally can not afford to turn failures.
5: Main chip 1-3 or 1-3 is to control the driver chips last turn, and its poor contact does not change. 5: Main chip 1-3 or 1-3 is to control the driver chips last turn, and its poor contact does not change.
6: IDE interface, then the feet together, so that the main chip is not reset, especially the 1-2 feet. 6: IDE interface, then the feet together, so that the main chip is not reset, especially the 1-2 feet.
7: 10 on the plate or under the flash is usually no or head 8V voltage control chip bad or no voltage input 8: Flash 5 on a plate or under the cache, the main chip, access to undesirable or bad. 7: 10 on the plate or under the flash is usually no or head 8V voltage control chip bad or no voltage input 8: Flash 5 on a plate or under the cache, the main chip, access to undesirable or bad.
9: as above will not work, it can only suspect that the main chip in question, and a change of view, but oh to be a very high welding technology. 9: as above will not work, it can only suspect that the main chip in question, and a change of view, but oh to be a very high welding technology.
***** The master chip have been changed, and head to enlarge the chip has changed, or not work, light still does not shine. ***** The master chip have been changed, and head to enlarge the chip has changed, or not work, light still does not shine. If the voltage is normal, then, depends on the voltage across the crystal. If the voltage is normal, then, depends on the voltage across the crystal. Oscillator is also very easy for the bad one of the components, if not enough, it may be PCB board is broken. Crystal is also very easy for the bad one of the components, if not enough, it may be PCB board is broken. ***** *****

Fireball Fireball LD circuit board repair disk for the 5400 switch to LD, because there is no on-board cache chips, only the main chip, head control chip, driver chip. Fireball Fireball LD circuit board repair disk for the 5400 switch to LD, because there is no on-board cache chips, only the main chip, head control chip, driver chip. At the same time relatively thick PCB board, small, not prone to the phenomenon of poor contact Therefore, the relative difficulty of maintenance is not so great. PCB board at the same time relatively thick, is small, the phenomenon is not prone to being exposed, so it is relatively easy maintenance, not so great. Driver IC also used Panasonic's AN8411 chip, although the chip is small, but the high temperature and resistance to high-pressure characteristics of a good, generally will not be bad. Driver chip also uses Panasonic's AN8411 chip, although the chip is small, but the high temperature and high pressure characteristics of a good, generally will not be bad. Working voltage: 8V, 3.3V, 2.5V. Working voltage: 8V, 3.3V, 2.5V. Fault phenomenon: Symptoms include:
1: a long bright light, the main chip, or bad 2: light micro-light, 2.5V voltage is not normal or a bad master chip, driver chip, bad 3: indicator light 5, the cache is not available, only the main chip, bad 4: indicator light 10, the head controller chip or bad, 8V voltage not, the main chip, bad 5: light does not shine, working voltage is not normal, the main chip, bad, bad driver chip 1: a long bright light, the main chip, or bad 2: light micro-light, 2.5V voltage is not normal or a bad master chip, driver chip, bad 3: indicator light 5, the cache is not available, only the main chip, bad 4: indicator light 10, the head controller chip or bad, 8V voltage not, the main chip, bad 5: light does not shine, working voltage is not normal, the main chip, bad, bad driver chip

Fireball Fireball other circuit board repair circuit boards there are other series CX, LE, VQ. Fireball Fireball other circuit board repair circuit boards there are other series CX, LE, VQ. CX and LCT similar, LE and LD similar to, VQ and AS similar. CX and LCT similar, LE and LD similar to, VQ and AS similar. These types of panels in front of the fault phenomena in order to introduce the fireball circuit board repair the same, but the extent of damage in several board is not so serious, usually for out the bad chips on it. These types of board failure phenomena in order to introduce the fireball in front of the same circuit board repair, but the extent of damage in several board is not so serious, are generally replacing bad chips on it. Especially the LE, most of them are good, bad multi-disc. Especially the LE, most of them are good, the bad multi-disc. But because of its disk model is different from its circuit board design and other circuit board or a bit different. However, because of its disk model is different from its circuit board design and other circuit board or a bit different. Also has its more extraordinary failure, are also common problem, and 11 will now be introduced for reference. Also has its more extraordinary failure, are also common problem, and 11 will now be introduced for reference.
1: LE Board: Failure to hit disk, it is mainly a bad head control chip to drive the bad cases are rare. 1: LE Board: Failure to hit disk, it is mainly a bad head control chip to drive the bad cases are rare.
2: VQ plate: Failure to seek is not complete, look for a little stopped, and the general based chip bad. 2: VQ plate: Failure to seek is not complete, look for a little stopped, and the general based chip bad.
3: LE, VQ plate: Fault for the light flash 5, generally bad for the cache. 3: LE, VQ plate: Fault for the light flash 5, generally bad for the cache.
4: CX panel: Most of the bad driver chips and next to the discharge transistor, there is next to the "Exclusion" 4: CX panel: Most of the bad driver chips and next to the discharge transistor, there is next to the "exclusion"
Fireball Fireball hard drive circuit board repair to add market share in the secondary volume is quite large, especially PCB Fireball LCT series of thin, large, long. Fireball Fireball hard drive circuit board repair to add market share in the secondary volume is quite large, especially PCB Fireball LCT series of thin, large, long. Likely to cause poor contact chip, coupled with a bad driver chips easily. Easily lead to poor contact chip, coupled with a bad driver chips easily. Therefore, the amount of maintenance are also great, though less components, but the phenomenon of multiple failures. Therefore, maintenance of large volume, although less components, but the phenomenon of multiple failures. Fireball in front of just talking about the series of common circuit board failures note. Fireball just kept right in front of the circuit board common faults of each series description. In fact, the actual repair of the fault also has a special need longer time to repair. In fact, the actual repair of the fault also has a special need longer time to repair. Is me in the actual repair process of the special method of fault diagnosis and removal of a presentation. The breakdown of the actual repair process, I fail to judge and remove the special method of presentation.
1: The Seeing clearly in the circuit board have fewer components, less like to add. 1: The Seeing clearly in the circuit board have fewer components, less like to add. Chips have poor contact, loose solder should be added. Chips have poor contact, loose solder should be added. Components or circuit boards have burned have burned bad. Components or circuit boards have burned have burned bad. For components, be wary. For components, be wary.
2: hand-touch circuit boards (electricity), to see if there is no element fever, fever is not unusual to see high-voltage components or have short-circuited. 2: hand-touch circuit boards (electricity), to see if there is no element fever, fever is not unusual to see high-voltage components or have short-circuited. There is no heating element also shows that there is no work, using multimeter measure the work of boards voltages are normal. Also shows that there is no heating element did not work, use multimeter to measure the plate voltage is normal.
3: power indicator light blinking as regards whether the concept of a normal search, flash-based chips look bad. 3: power indicator light blinking as regards whether the concept of a normal search, flash-based chips look bad. Weishan, under normal operating voltage mainly the bad chip. Wei Shan, the working voltage of the main chip, under normal bad. Micro-light, the main chip under normal operating voltage or bad, bad driver chips. Micro-light, the main chip under normal operating voltage or bad, bad driver chips.
4: EL, CR, EX, CX, lights flash six normal, other flash 10, the flash under all five of the cache being exposed or bad, there is the main chip connection is bad or broken. 4: EL, CR, EX, CX, lights flash six normal, other flash 10, the flash under all five of the cache being exposed or bad, there is the main chip connection is bad or broken.
5: look at the circuit board fineness, multi-chip fineness good or bad, into a multi-color will be poor contact. 5: look at the circuit board fineness, multi-chip fineness good or bad, into a multi-color will be poor contact. Power and vigorously pressed their hands to see whether chip will affect the work plate. Strongly pressed by hand power chip to see if will affect the work plate.
6: Comparison of circuit boards, chip, thin legs, there must be patience and energy. 6: Comparison of circuit boards, chip, thin legs, there must be patience and energy. Blowing chip temperature should be fine, too high will blow a bad chip. Blowing chip temperature should be fine, too high will blow a bad chip.

Fireball fireball classification of circuit boards PCB board are quite different from each series, the main chip is also different. Fireball fireball classification of circuit boards PCB board are quite different from each series, the main chip is also different. From the appearance can be identified. Can be identified from their appearance. Is the LCT series 706,702,303 are SE, ST board more difficult to identify. Is the LCT series 706,702,303 are SE, ST board more difficult to identify. Fireball now sort out the circuit board, for reference: Fireball now sort out the circuit board, for reference:
1, plate: 03 main chip :14-108406-03 1, plate: 03 main chip :14-108406-03
2, plate: 501 Main chip :14-108406-02 2, plate: 501 Main chip :14-108406-02
3, plate: 812, the main chip, :14-108413-02 3, plate: 812, the main chip :14-108413-02
4, plate: 411,412 Main Chip: D9046CM 101 4, plate: 411,412 Main Chip: D9046CM 101
5, plate: 013 Main chip :14-113271-02 5, plate: 013 Main chip :14-113271-02
6, plate: 110,111 Main chip :14-113271-04 6, plate: 110,111 Main chip :14-113271-04
7, plate: 701,702 Main Chip: D760006GJ 101 7, plate: 701,702 Main Chip: D760006GJ 101
8, plate: 706 Main Chip: D760006GJ 102 8, plate: 706 Main Chip: D760006GJ 102
9, plate: 303 Main Chip: D760006GJ 106 9, plate: 303 Main Chip: D760006GJ 106
10, plate: 906,907,908 Main Chip: D8915GJ 101 10, plate: 906,907,908 Main Chip: D8915GJ 101
11, plate: 206,207,208 Main Chip: D760009GJ 101 11, plate: 206,207,208 Main Chip: D760009GJ 101
12, plate: 314,315 Main Chip: D760009GJ 103 12, plate: 314,315 Main Chip: D760009GJ 103
13, plate: 306 Main Chip: 760009BGJ 104 13, plate: 306 Main Chip: 760009BGJ 104





IBM hard drive Common Faults and maintenance practices: IBM hard drive Common Faults and Repair Method:
1. 1. Prone to bad sectors. Prone to bad sectors.
Reason: circuit board data interface with the plate body caused by loose or poor contact; speed of transmission caused by bad sectors too fast. Reason: circuit board data interface with the plate body caused by loose or poor contact; speed of transmission caused by bad sectors too fast.
Solution: remove the circuit board, the interface part of the clean-up time (usually the first step on the IBM hard drive that is the case), and then on the back, in the same time, because the circuit board from time to time in the production of defective works, so on the way back, should be pushed outward as much as possible and get as much as possible on the screws tight. Solution: remove the circuit board, the interface part of the clean-up time (usually the first step on the IBM hard drive that is the case), and then on the back, in the same time, because the circuit board from time to time in the production of defective works, so on the way back, should be pushed outward as much as possible and get as much as possible on the screws tight. If you see uneven interface board can be used add a little air gun rosin processing look for a smooth interface. If you see the circuit board interface uneven, you can use air guns but add a little rosin processing a bit to make a smooth interface. And then connected to the hard disk, if the data can not retained to give the hard disk Hddl "cleared", or DFT's "Erase Disk", with Hddl much faster, the effect is not bad, using DFT slowly for about 12 hours, but a dedicated IBM tools, IBM would become more effective; and DDD-SI is also the words of

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