First solve the machine does not read the disk. The working current of the laser tube is 45mA, which is normal. The focus of the bald head is also normal, but the ICl01 (CXAl782BQ) twenty-fifth foot (FOK output) voltage has been 0V, there is no focus search success high level. In order to avoid due to disk support passive caused by distance between head and disk incompatible and can not read dish, try to disc tilt to different angles, by adjusting the distance between the head and the disc to the normal position, but after several attempts ICl01 the 25 foot still no high level output.

Judging faults in the RF circuit or FOK forming circuit. This part of the circuit is ICl01's 25 feet to 36 feet. On this part of the pin voltage is examined and found that the ICl01 thirty-fifth pin voltage is 0V, the 36 foot is 3.16V. These two feet are the signal input to the optical detector, and the two pin voltage is about 2.5V. Now the two leg voltage obviously deviation is too much, but pulled out and head of the cable voltage of the two pin were restored to normal, and bald photodiode detection and are normal. Check the connection of the photoelectric detector of the eight core cable is hard, is not original, and is connected with the wrong, the head signal input circuit board wiring order just upside down, ICl01 35 feet is shorted to ground. This cable is properly inserted, ICl01 35, 36 feet back to normal voltage.

The test machine ICl01 twenty-fifth feet FOK voltage output, but the disc along the head down tilt, with the FOK output voltage. Then adjust the spindle motor pallet height, adjusted the disc has been able to read. Then head mounted frame, found only moderate elastic spring four, has been to use hot plastic column part of the head frame will be installed.

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