Computer hard disk circuit failure and maintenance

Hard drive circuit failure rate is high, the following XP system home according to the circuit function analysis.

1. The power supply circuit of the hard disk

The power supply of the hard drive comes from the ATX power supply of the host, transforming the power on the hard drive to the voltage required for the hard drive to work properly. If there is a problem with the power supply circuit of the hard disk, it will directly cause the hard drive to work. Fault phenomenon is often shown as no power, hard disk detection, the disc does not turn, the head does not seek road and so on. The parts of the power supply circuit which often fail are the terminals of the socket, the filter capacitor, the diode, the transistor, the field effect tube, the inductor, the insurance resistor and so on.

2. Interface

Interface is the transmission of data between the hard disk and the computer channel, the interface circuit such as failure, may result in the detection of hard disk, garbled, parameter mistaken recognition and so on. The interface circuit is prone to failure is the interface chip or matching with the crystal oscillator, interface pin broken, virtual welding, dirty, interface row resistance and so on.

3. Caching

Caching is used to speed up the data transmission speed of the hard disk, if the failure may cause the hard drive, garbled, and abnormal panic after entering the operating system.

4.ROM

ROM chip assimilation software can initialize the hard drive, power up and start the spindle motor, power up the initial seek, positioning and fault detection.

5. Head Chip

The track chip is mounted on the head assembly to enlarge the head signal, handle the logic distribution of the head, handle the feedback signal of the voice coil motor, and the failure of the chip can cause the head not to seek the correct way, the data can not write the human disc, the hard disk and the internal sound of the hard disk

6. Front Signal processor

The front signal processor is used to process the digital signals from the embedded head chip. The failure of the chip will cause the system not to correctly recognize the failure of the hard drive.

7. Digital Signal Processor

The digital signal processor is used to process the data signal transmitted by the forward signal processor, decode the signal, or receive the data signal transmitted by the computer, and encode the signal.

8. Motor Drive Chip

The motor drive chip is used to drive the hard drive spindle motor and the voice coil motor. Now the hard drive because of the speed quickly, easy to cause the chip calorific value and damage. According to statistics, about 70% of the hard drive circuit roadblocks are caused by the chip damage.

9. Spindle Motor

Spindle motor used to drive the disc high-speed rotation, now most of the hard drive to the mouth liquid bearing motor, precision is very high, the hard disk after a severe collision will make the bearing clearance becomes large, reading data becomes difficult, abnormal sound or can not detect the hard disk failure.

10. Head

The head is used to read or write the data of the hard disk, and it is easy to damage the head when the collision occurs, causing the system not to recognize the hard

11. Positioning Clamp

The positioning clamp is used to keep the head in the opening and stopping areas. Many hard disk positioning clips are easy to dislocation, resulting in the head can not be normal search path. In the open maintenance conditions do not have the case, can be a certain angle appropriate percussion hard disk, so that the clamp back to the correct position.

In general, in the hard disk circuit board failure, the Power interface, motor drive chip, power converter chip failure rate is high.