Troubleshooting - Sharp CD-C1W Service Manual

When the CD does not function
When the CD section does not operate When the objective lens of the optical pickup is dirty,this section may not operate.Clean
the objective lens,and check the playback operation.When this section does not operate even after the above step is taken,check
the following items.
Remove the cabinet and follow the troubleshooting instructions.
"Track skipping and/or no TOC(Table Of Contents) may be caused by build up of dust other foreign matter on the laser pickup lens.
Before attempting any adjustment make certain that the lens is clean. If not, clean it as mentioned below."
Turn the power off.
Gently clean the lens with a lens cleaning tissue and a small amount of isopropyl alcohol.
Do not touch the lens with the bare hand.
• The CD tray fails to operate.
Check the changer mechanism cam switch (SWB101 to
SWB104) and tray switch (SWB105 to SWB108).
Check whether state changes to Low when
IC201 pin 96 cam SW1
pin 96 cam SW2
pin 97 cam SW3
pin 98 cam SW4
is on.
Check whether state changes to Low when
IC201 pin 33 tray SWA
pin 100 tray SWB
pin 1 tray SWC
pin 2 tray SWB
is on.
ICheck whether output of pins 3 and 7 of main cam motor
driver IC81 is normal.
Check whether the output of pins 3 and 7 of tray motor
driver IC82 is normal.
Check the motors MOB1 and MOB2.
• The CD function will not work.
The CD operating keys don't work
Yes
Check the CD, DSP, power supply, and 16.93 MHz clock
and reset terminal IC2 pin 57.
Yes
Check the waveform of SCK, SO (DATA) and SI (COMM).
Check the waveform of IC2 pin 54 (SQOUT), pin 55 (COIN),
and pin 57 (CQCK).
Yes
Check that the pickup is in the PICKUP IN switch position
of SW702A.
Yes
If the items mentioned above are OK, check the main
microcomputer IC201.
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TROUBLESHOOTING

Yes
Yes
Yes
Yes
Check the connection between IC201 and SW.
No
Check the connection from IC2 to IC81.
No
Check the connection from IC2 to IC82.
No
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CD-C1W,CP-C1W