Graphic computer system hard disk repair and data recovery 16.txt
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three.two.2 Really hard disk physical fault repair 1. Failure evaluation and processing methods In the event the hard disk body is physically damaged, generally speaking, there's no improved method than replacing the tough disk. Furthermore to obtaining a lot more complicated circuits, the tough disk drive also has a massive quantity of really precise mechanical parts. When the tough disk sealing head, disk assembly as well as other parts fail, the cover can only be opened for inspection and remedy within a clean environment. Therefore, it's hard to repair the physical failure with the challenging disk, and it is actually hard for basic non-professional maintenance personnel to detect and repair the device failure with the hard disk. The following briefly introduces the analysis of physical faults and general processing measures. (1) First verify whether the challenging disk configuration information and facts is lost within the CMOS settings. Measure the COMSRAM circuit around the motherboard to see when the battery is faulty, or no matter whether the elements (for instance diodes, transistors, resistors, capacitors, etc.) are broken. These motives may cause errors in the really hard disk configuration parameters in CMOS. (I) Pass the power-on self-test. In the event the screen displays the error message '1701' or 'HardDiskError,' the really hard disk itself is faulty. Or the really hard disk adapter card isn't inserted correctly, or the connection in between the challenging disk and the difficult disk adapter is not effectively inserted, or the difficult disk adapter is defective. (three) Shutdown , Open the cover, test no matter if the +5V, +12V energy supply voltage is normal, and regardless of whether the fan in the energy provide box rotates, to judge no matter whether the external circuit is standard. (four) Check the signal cable, regardless of whether the plug as well as the difficult disk adapter card are inserted, and no matter if there's Reverse or poor get in touch with. Make an effort to replace some cable plugs. (five) Use the 'replacement method' to ascertain the faulty components. Find a great hard disk adapter card (or multi-function card) to replace the difficult disk adapter card, examine and judge Is there a problem using the difficult disk adapter card or the really hard disk drive itself. (six) Observe irrespective of whether the stepping motor is stuck, if it is stuck, dial it back for the beginning position by hand. Throughout the maintenance method, you will need to cautiously verify, test, analyze and locate Repair the damaged elements or replace the really hard disk adapter card. Soon after the above remedy, provided that the really hard disk body itself is just not broken, only the common connector's poor get in touch with or external circuit failure could be swiftly eliminated. 2 ．The processing technique of really hard disk hardware failure If the trouble can't be solved after the above treatment, the associated devices on the really hard disk program can be broken. At this time, the following methods could be applied to continue the detection. 1) The replacement process is to replace using a backup plug-in device Faulty plug-ins or devices, or exchange exactly the same plug-ins or devices with one another, after which observe the adjust with the fault to seek out the bring about of the fault. Soon after POST self-test, the screen displays the error message '1701' or 'HardDiskError' to identify the fault Within the case of many integrated chips, the replacement strategy may be applied to steadily narrow down the fault search variety. As an example, replace the suspected faulty circuit board with a typical circuit board, and unplug the suspected integrated circuit chip in the tube base and plug it in New chip. If a specific device is standard right after insertion and replacement, it indicates that the board or chip is faulty. Note: When repairing the hard disk, to be able to distinguish amongst a circuit failure in addition to a disk failure, you can use a good model in the similar model. The circuit board replaces the circuit board to be repaired. If it can operate usually, it means that the circuit board is faulty; if it will not operate ordinarily, it suggests that the disk physique is faulty. two) The resistance measurement strategy uses the electrical resistance of a multimeter to measure the internal resistance from the element, Based on the size with the resistance or the on/off circumstance, analyze the result in in the fault in the circuit. The input and output pins on the common elements or components have a certain resistance for the ground or the energy provide. Use a pointer multimeter to measure, It truly is normally the case that the forward resistance is small along with the reverse resistance is large. Normally, the forward resistance is involving tens of ohms and one hundred ohms, along with the reverse resistance is a lot more than numerous ohms. However the forward resistance will never be equal to 0 or Close to 0, the reverse resistance will not be infinite, otherwise, it is best to suspect regardless of whether the pin is shorted or open. When it truly is determined that the failure from the difficult disk subsystem is on a specific board or a handful of chips, it is possible to use the resistance method Search. Shut down and energy off, use a multimeter to block the measurement from the on/off, open circuit, short circuit, resistance worth of your device and board, as shown in Figure 3-4 Show. If the DC resistance worth with the stepping motor winding in the measured difficult disk is 24Ω, it meets the nominal value; if the resistance value is about 10Ω, it indicates that there's a neighborhood short-circuit fault; when the resistance value is 0Ω or a couple of ohms, it means that the winding is short-circuited or burned . The flat cable signal line from the really hard disk drive is usually measured by the on/off technique. The power cord of your difficult disk is usually unplugged for single test, and its resistance to ground may also be measured on-line. When the resistance worth is infinite, it truly is an open circuit; when the resistance worth is significantly less than 10Ω, a regional quick circuit really should be suspected and further inspection is expected. 3) The voltage measurement strategy is shown in Figure 3-5. Under power-on, use a multimeter to measure the voltage in between every pin with the component as well as the ground, and evaluate it using the voltage worth in the logic diagram or other reference points. Compare. In the event the difference between the voltage worth along with the normal reference value is large, the component is faulty; when the voltage is regular, the aspect is intact as well as other components may be tested. The power provide of your hard disk could be the identical as that in the floppy disk. There are four wire ends, namely +12V, +5V, -5V and ground. http://www.google.com rated voltage of the hard disk stepping motor is +12V. When the challenging disk begins, the present is huge. When the power supply is poorly regulated (the voltage drops from 12V to eight.5V), it is going to lead to unstable speed or difficulty in starting. The power provide voltage around the expansion slot on the I/O channel method board is +12V, -12V, +5V, and -5V. The high level of the signal voltage on the board must be greater than two.5V, along with the low level should be less than 0.5V. The plug and socket of the challenging disk drive have a voltmeter according to the arrangement on the pins, and the higher level is 2.5V to 3.0V. When the high level output is much less than 3V, the low level output greater than 0.6V is the fault level. The logic level measurement is often measured with an oscilloscope or estimated using a logic pen.
4) The current measurement strategy is shown in Figure 3-6. If there's a partial short circuit, the short-circuit element will heat up and heat, and could lead to the fuse to blow. Connect the multimeter in series towards the fault line and check whether the current exceeds the standard worth. The brief circuit from the chip around the hard disk drive adapter card will bring about the system load present to improve, along with the drive motor brief circuit or the drive short circuit will cause the host power supply to fail. Tough disk power supply + 12V operating existing ought to be about 1.1A. When the load present in the difficult disk drive increases, it will result in the difficult disk to begin excellent and terrible. Brief circuit in the motor or overcurrent of your load will cause the fuse to blow, and in serious situations, harm towards the power block and switch adjustment tube. Inside the increased current loop, a dummy load is often connected in series for measurement. If a fuse is installed, a single finish of the fuse is often disconnected along with a multimeter is connected in series for measurement. If it really is the power cord of a chip around the printed circuit board, you may cut the copper foil lead with a knife or possibly a hacksaw blade and string it in to the multimeter to measure. The motor plug and energy plug is often taken out from the bayonet and connected in series with a multimeter for measurement.
five) The signal tracking method can send the test signal source for the fault location for testing if circumstances permit. Use a logic pen or an oscilloscope to test according to the logic diagram. If the detected portion has excessive waveform delay, incorrect phase sequence, and waveform distortion, it signifies that the fault point is within this component, and further inspection really should be carried out. When a test signal is sent for the input, you can use a logic pen tracer or an oscilloscope to seek out the trace of the signal output and check the level transform as outlined by the logic diagram. One example is, if there's a signal in the input end with the interface cable connected towards the challenging disk drive and no signal output in the output finish, it may be concluded that the fault is around the third-stage circuit. It truly is rougher to trace having a logic pen, and an oscilloscope is necessary to accurately measure the pulse waveform and amplitude. Analyze and evaluate the handle signals, strobe pulses and interface signals on the major test points to establish the fault point. Connect the multimeter in to the circuit to measure the existing as shown in Figure 3-7.
3.2.three Really hard disk circuit rapidly repair The hard disk circuit makes use of fewer components, however the failure rate is higher. This section will introduce the repair strategy on the tough disk circuit and typical hard disk circuit failures. 1. The fundamental maintenance strategy of your challenging disk circuit (1) depends upon whether or not there are few elements on the circuit board, along with the much less should be added. Whether the chip has poor speak to, loosen it, add soldered component or burnt the circuit board, you ought to be careful when replacing the component. (two) Touch the circuit board by hand (energy on) to find out if there is certainly any element heating. The abnormal heating is dependent upon irrespective of whether the voltage is higher or there is a element short circuit failure. If there is no heat, it signifies that the component will not be working. Use a multimeter to measure regardless of whether the functioning voltage on the circuit board is normal. (3) Observe no matter whether the indicator flashes normally following power-on. A flash indicates that the key chip is broken. Slight flashing and in the event the operating voltage is typical, the main chip is broken. When the brightness is vibrant plus the operating voltage is typical, the main chip is broken, along with the driving chip is broken. (four) Appear at the high quality with the circuit board (colour), the great good quality (color) is mostly bad chip, the poor high-quality (color) will bring about poor contact failure. Following energy on, press the chip together with your hands to determine if it's going to have an effect on the disk's work. (5) The chip feet with the circuit board are fairly thin, and also you must be patient and focused. The temperature must also be adjusted when blowing the chip, also high will blow the chip.
two. Popular fault repair of circuit part.
When overhauling some circuit failures, the principle gear and instruments to be prepared incorporate energy provide, multimeter, electric soldering iron or hot air gun. When overhauling, initial connect the computer's power supply to an AC plug, connect the tough disk plug to the power plug, and short-circuit the green and black wires inside the energy output plug to start the energy provide, as shown in Figure 3-8.
1) Energy provide circuit failure The power provide circuit failure typically shows the error message 'DISKBOOTFAILURE, INSETRDISKANDPRESSENTER' immediately after booting, as shown in Figure 3-9. The key fault may be the information cable, power cable, really hard disk setting jumper error, etc., followed by the BIOS setting error.
(1) Troubleshoot the power supply interface. After the challenging disk is connected towards the energy provide, if you touch the really hard disk without having vibration, you can't hear the sound in the challenging disk rotating, you need to initially check the 5V, 12V energy interface circuit, as shown in Figure 3-10.
When it's found that the input voltage is abnormal or power is off, it is important to check no matter whether the welding point, if there is virtual sweat and open welding,
Use an electric soldering iron or hot air welding gun for welding, as shown in Figure 3-11.
(2) Overhaul of internal power supply circuit. When overhauling the power supply circuit, the on-road measurement system, voltage detection strategy and element replacement process are primarily used for maintenance. When the 5V and 12V energy provide is normal, you may straight detect the energy supply output isolation diode, motor drive power supply diode, energy supply inductance and field impact energy provide tube, voltage regulator, spindle motor drive IC power supply, spindle motor power supply terminal and also other voltages to manage The IC circuit voltage, etc. are shown in Figure 3-12 to Figure 3-18. When there isn't any voltage at any point, the on-road measurement approach is utilized to detect no matter whether the component is broken or the component is straight replaced by the substitution technique.
In actual upkeep, when it is actually detected that the power supply voltage is standard, if it's suspected that the integrated circuit is broken, replace the circuit board straight (you'll be able to uncover the really hard disk motherboard replacement from the exact same model); when the circuit board is replaced, the difficult disk nevertheless can't perform. The disc physique may be repaired as outlined by the opening system described in Chapter 2. two) Information line interface failure. When the energy supply interface and energy provide circuit are regular, the spindle motor can run ordinarily. photo recovery by folder should be within the data signal processing circuit. At this time, you should initially check whether or not the data line interface has poor speak to and whether the virtual welding is opened. If it should be welded, see Figure 3-19.
Right after welding the information cable interface, when the really hard disk continues to be not identified, you ought to verify irrespective of whether the interface among the disk physique plus the circuit board is oxidized or the speak to spring is deformed as a result of get in touch with spring deformation. If making use of tweezers to calibrate the reed, and use fine sandpaper to polish the circuit board contacts and reed, as shown in Figure 3-20.
Soon after the above processing, when the hard disk can't be identified, you should check the circuit for example exclusion, data processing chip and cache. The hot air gun can be used to weld the whole body 1st to remove the failure of the virtual welding. When the failure can't be eliminated, the cache and information processing chip ought to be replaced, as shown in Figure 3-21.
4) The current measurement strategy is shown in Figure 3-6. If there's a partial short circuit, the short-circuit element will heat up and heat, and could lead to the fuse to blow. Connect the multimeter in series towards the fault line and check whether the current exceeds the standard worth. The brief circuit from the chip around the hard disk drive adapter card will bring about the system load present to improve, along with the drive motor brief circuit or the drive short circuit will cause the host power supply to fail. Tough disk power supply + 12V operating existing ought to be about 1.1A. When the load present in the difficult disk drive increases, it will result in the difficult disk to begin excellent and terrible. Brief circuit in the motor or overcurrent of your load will cause the fuse to blow, and in serious situations, harm towards the power block and switch adjustment tube. Inside the increased current loop, a dummy load is often connected in series for measurement. If a fuse is installed, a single finish of the fuse is often disconnected along with a multimeter is connected in series for measurement. If it really is the power cord of a chip around the printed circuit board, you may cut the copper foil lead with a knife or possibly a hacksaw blade and string it in to the multimeter to measure. The motor plug and energy plug is often taken out from the bayonet and connected in series with a multimeter for measurement.
five) The signal tracking method can send the test signal source for the fault location for testing if circumstances permit. Use a logic pen or an oscilloscope to test according to the logic diagram. If the detected portion has excessive waveform delay, incorrect phase sequence, and waveform distortion, it signifies that the fault point is within this component, and further inspection really should be carried out. When a test signal is sent for the input, you can use a logic pen tracer or an oscilloscope to seek out the trace of the signal output and check the level transform as outlined by the logic diagram. One example is, if there's a signal in the input end with the interface cable connected towards the challenging disk drive and no signal output in the output finish, it may be concluded that the fault is around the third-stage circuit. It truly is rougher to trace having a logic pen, and an oscilloscope is necessary to accurately measure the pulse waveform and amplitude. Analyze and evaluate the handle signals, strobe pulses and interface signals on the major test points to establish the fault point. Connect the multimeter in to the circuit to measure the existing as shown in Figure 3-7.
3.2.three Really hard disk circuit rapidly repair The hard disk circuit makes use of fewer components, however the failure rate is higher. This section will introduce the repair strategy on the tough disk circuit and typical hard disk circuit failures. 1. The fundamental maintenance strategy of your challenging disk circuit (1) depends upon whether or not there are few elements on the circuit board, along with the much less should be added. Whether the chip has poor speak to, loosen it, add soldered component or burnt the circuit board, you ought to be careful when replacing the component. (two) Touch the circuit board by hand (energy on) to find out if there is certainly any element heating. The abnormal heating is dependent upon irrespective of whether the voltage is higher or there is a element short circuit failure. If there is no heat, it signifies that the component will not be working. Use a multimeter to measure regardless of whether the functioning voltage on the circuit board is normal. (3) Observe no matter whether the indicator flashes normally following power-on. A flash indicates that the key chip is broken. Slight flashing and in the event the operating voltage is typical, the main chip is broken. When the brightness is vibrant plus the operating voltage is typical, the main chip is broken, along with the driving chip is broken. (four) Appear at the high quality with the circuit board (colour), the great good quality (color) is mostly bad chip, the poor high-quality (color) will bring about poor contact failure. Following energy on, press the chip together with your hands to determine if it's going to have an effect on the disk's work. (5) The chip feet with the circuit board are fairly thin, and also you must be patient and focused. The temperature must also be adjusted when blowing the chip, also high will blow the chip.
two. Popular fault repair of circuit part.
When overhauling some circuit failures, the principle gear and instruments to be prepared incorporate energy provide, multimeter, electric soldering iron or hot air gun. When overhauling, initial connect the computer's power supply to an AC plug, connect the tough disk plug to the power plug, and short-circuit the green and black wires inside the energy output plug to start the energy provide, as shown in Figure 3-8.
1) Energy provide circuit failure The power provide circuit failure typically shows the error message 'DISKBOOTFAILURE, INSETRDISKANDPRESSENTER' immediately after booting, as shown in Figure 3-9. The key fault may be the information cable, power cable, really hard disk setting jumper error, etc., followed by the BIOS setting error.
(1) Troubleshoot the power supply interface. After the challenging disk is connected towards the energy provide, if you touch the really hard disk without having vibration, you can't hear the sound in the challenging disk rotating, you need to initially check the 5V, 12V energy interface circuit, as shown in Figure 3-10.
When it's found that the input voltage is abnormal or power is off, it is important to check no matter whether the welding point, if there is virtual sweat and open welding,
Use an electric soldering iron or hot air welding gun for welding, as shown in Figure 3-11.
(2) Overhaul of internal power supply circuit. When overhauling the power supply circuit, the on-road measurement system, voltage detection strategy and element replacement process are primarily used for maintenance. When the 5V and 12V energy provide is normal, you may straight detect the energy supply output isolation diode, motor drive power supply diode, energy supply inductance and field impact energy provide tube, voltage regulator, spindle motor drive IC power supply, spindle motor power supply terminal and also other voltages to manage The IC circuit voltage, etc. are shown in Figure 3-12 to Figure 3-18. When there isn't any voltage at any point, the on-road measurement approach is utilized to detect no matter whether the component is broken or the component is straight replaced by the substitution technique.
In actual upkeep, when it is actually detected that the power supply voltage is standard, if it's suspected that the integrated circuit is broken, replace the circuit board straight (you'll be able to uncover the really hard disk motherboard replacement from the exact same model); when the circuit board is replaced, the difficult disk nevertheless can't perform. The disc physique may be repaired as outlined by the opening system described in Chapter 2. two) Information line interface failure. When the energy supply interface and energy provide circuit are regular, the spindle motor can run ordinarily. photo recovery by folder should be within the data signal processing circuit. At this time, you should initially check whether or not the data line interface has poor speak to and whether the virtual welding is opened. If it should be welded, see Figure 3-19.
Right after welding the information cable interface, when the really hard disk continues to be not identified, you ought to verify irrespective of whether the interface among the disk physique plus the circuit board is oxidized or the speak to spring is deformed as a result of get in touch with spring deformation. If making use of tweezers to calibrate the reed, and use fine sandpaper to polish the circuit board contacts and reed, as shown in Figure 3-20.
Soon after the above processing, when the hard disk can't be identified, you should check the circuit for example exclusion, data processing chip and cache. The hot air gun can be used to weld the whole body 1st to remove the failure of the virtual welding. When the failure can't be eliminated, the cache and information processing chip ought to be replaced, as shown in Figure 3-21.
