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MD-DR370H
� Audio playback circuit. Although the playback time display is acting., no sound is given during playback in the normal mode. Is PWM signal output from IC201 pins 68, 69, 72, 73 ? No Check the periphery of IC201.
Yes Is audio waveform output from J703 pins 1 to 4 ?
No
Check whether there is defective solder joint of audio signal line between J703.
Yes Check headphones jack, and periphery of headphone. � The spindle motor fails to run. Does the head move. Does the waveform appear on the IC201 pins 26 and 27 after TEST mode AUTO2 completion and in this state ? Yes Does waveform appear on IC601 pins 60 to 63 ? No IC601, CN601 and flex, etc. soldering check. No Check the IC201 periphery.
Yes Replace the spindle motor.
7�2
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