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CD-C602,CP-C602
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• When the CD tray fails to open or close.
Is there following voltage input in specific state of IC2 pin 27?
Open state: 0V
Close state: 0V
Intermediate state between open state and close state: 4.3V
Is H output to IC2 pin 24 or 25 for 7 seconds when the OPEN/
CLOSE button is pressed? IC91 is defective. Replace it.
Is 4V output between IC91 pins 3 and 7 during operation
stated above?
Check the loading motor (M3) and the loading mechanism.
Yes
Yes
Yes
No
No
IC2 defective.
No
Check the periphery of IC91.
IC91 defective.
OK
OK
Check the OPEN/CLOSE switch and the wiring from the IC2
pin 27 to the OPEN/CLOSE switch.
Check the wiring of the IC2 pins 24 and 25, IC91 pins 1 and 3.
• The CD function will not work.
The CD operating buttons don't work.
Check the CD, DSP, power supply, and 16.93 MHz clock, and
reset terminal.
Check the waveform of SCK, SO (DATA) and SI (COMM).
Yes
Yes
See if the pick-up in the PICKUP IN switch position.
If the items mentioned above are OK, check the main
microcomputer IC701.
Yes
Yes
No
Is there following voltage input on the IC2 pin 28 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 switch and the wiring from the IC2 pin
28 to the MECHA UP switch.
Is 4V output from the Q91 emitter during operation stated
above?
Yes
Yes
Check the wiring of IC2 pin 26 and Q93 pin 2.
OK
No
No
Is L output from the IC2 pin 26 during SEC when the disc skip
switch is pressed?
Yes
Check turntable motor and turntable mechanism.
Check Q91, Q93 and the periphery.
IC2 defective.
Содержание CD-C602
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