Service manual

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CD-C831W
• When the turntable fails to stop.
Is from 5 V till 2.5V down pulse (approx. 300 ms)
Check the SWM3 and the wiring from the IC701 pin 21 to the
SWM3.
No
No
input into the IC701 pin 21 when the turntable is rotating?
5V
2.5V
0V
Yes
Check IC2 pin26 the periphery.
Check the MECHA UP SW and the wiring from the IC701 pin
21 to the MECHA UP SW.
No
Yes
Is there following voltage input on the IC701 pin 21 in the
specific state?
When the CD mechanism is moved up: 0V
In other states: 4.3V
Yes
Is there following voltage input on the IC701 pin 21 in the
specific state?
In other states: 4.3V
When the CD mechanism is moved up: 0V
• When turntable fails to move.
Check the MECHA UP SW and the wiring from the IC701 pin
21 to the MECHA UP SW.
Yes
Yes
Check the wiring of IC2 pin 26.
OK
No
Is L output from the IC2 pin 26 during SEC when the disc skip
switch is pressed?
Check turntable motor and turntable mechanism.
IC701 defective.
IC2 defective.