Sharp SYSTEM-CD130H Service Manual page 22

SYSTEM-CD130H
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TROUBLESHOOTING (CD SECTION)
When the CD does not function £93 AYP SEAS,
When the CD section does not operate When the objective lens of the optical pickup is dirty,this section may not opérate.Clean.the
objective lens,and check the playback operation.When this section does.not operate even after the above step is'taken,checkithe
following items. aa
Remove the cabinet and follow the troubleshooting instructions.
spt telas
. bt ORE ge, Me Bee
"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."
ae eee e e
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 operating keys don't work.
Yes :
Check the CD, DPS microcomputer (1C701), power supply, 4.19
MHz and 16.93 MHz clock, and reset terminal. ae
Yes
Check the waveform of SCK, SO (DATA) and S! (COMM)
Yes
See if the pick-up is in the pick-up in SW702 position.
Yes
If the items mentioned above are OK, check the main
microcomputer IC701
Check the Focus - HF system.
Playback can be performed without a disc.
or
r ey ee 4
Yes
No
D form of IC801(1 h i . :
Fig 22? UDELL WEveronn
(16)(FD) match that shown in
+ ! Check the area around iC804-BI801/CNS801.
Yes
No
Oe eS iereremed,
Check he oe
ae (51)(CL), (52)(DAT) and
16801 68) FD [od dle AN le Weal | Coe
ene
CeO
sent
Rae See
0.5s
car @ro_| | | |: | | i_
Figure 22
a 20s