Troubleshooting (Cd Section) - Sharp CD-C250X BK 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 takencheck 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.
turntable is rotating?
,
Is there following voltage input on the IC701 pin 9 in the specific
state?
When the CD mechanism is moved up: L
In other states: H
Is there following voltage input on the IC701 pin 9 in the specific
state? -
When the CD mechanism is moved up: L
In other states: H
I
S
Is H output from the IC701 pin 19 during SEC when the disc skip
switch is pressed?
above?
Check turntable motor (Ml) and turntable mechanism.
Yes
Yes
Yes
I
Yes
Yes
Yes
No
, Check the SW3 and the wiring from the IC701 pin 9 to the
No
sw3.
No
Check the wiring from the IC701 pin 25 to the Q903 base.
Check the wiring of IC701 pin 19 and Q904 pin 2.
Check Q901,
OK