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MD-MT877/MD-MT877C
Yes
Check for defective solder joint of audio signal line between
IC703 and J703.
No
Yes
Is audio waveform output from J703 pins 3 and 4.
Check the pins 4 and 21 of IC703.
No
Yes
Is audio waveform output from IC703 pins 8 and 17.
Check IC201 pins 70 to 72, pin 74 and IC501 pins 9, 10, 11,
12.
No
• Abnormal display.
No
Yes
Are the pin 2 (VCC) and pin 12, 13 (GND) normal ?
Is waveform output from IC401 pins 31 to 33 ?Is waveform output from CN451 pins 3 to 5 ?
Yes
Check between IC401 and
CN451.
No
Check the periphery of IC401.
• Audio playback clrcult.
Is audio waveform output from IC501 pins 15 and 16 ?
Check headphones jack, and periphery of headphone.
In the normal playback mode, LCD play time display functions, but no audio is heard.
Check for pattern breakage of flexible PWB, check for
defects of display microcomputer (replace the display unit).
• The spindle motor fails to run. Does the head move.
No
Does the waveform appear on the IC201 pins 24 and 25 after
TEST mode AUTO2 completion and in this state ?
Check the IC201 periphery.
Yes
Does waveform appear on the IC601 pin 15 ?
Does waveform appear on IC601 pins 7, 10 and 12 ?
Replace the spindle motor.
Yes
No
L608, IC201, IC601, CN601 and flex, etc. soldering check.
No
Replace IC601.
Yes