CD-CH1000 (serv.man7). Trouble shooting guide - Sharp Audio Service Manual (repair manual)

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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.

Dust gradually accumulates on the objective lens during use, and it may degrade performance.  To avoid this problem, use a
cleaning disc designed for CD optical pickup lenses.

HOW TO USE
1. Using the brush in the cleaner cap, apply 1 or 2 drops of the cleaning fluid to the brush on the CD cleaner disc which has

the 

 mark next to it.

2. Place the CD cleaner disc onto the CD disc tray with the brush side down, then press the play button.
3. You will hear music for about 20 seconds and the CD player will automatically stop.  If it continues to turn, press the stop
button.
CAUTION

 The CD lens cleaner should be effective for 30~50 operations, however if the brushes become worn out earlier then please

replace the cleaner disc.

 If the CD cleaner brushes become very wet then wipe off any excess fluid with a soft cloth.

 Do not drink the cleaner fluid or allow it to come in contact with the eyes.  In the event of this happening then drink and /

or rinse with clean water and seek medical advice.

 The CD cleaner disc must not be used on car CD players or on computer CD-ROM drives.

 All rights reserved. Unauthorized duplicating, broadcasting and renting this product is prohibited by law.

Cleaner Liquid

Cleaning Disc
PARTS CODE: UDSKA0004AFZZ

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STEP 1

Does the display "E-CD01" appear?

Yes

No

Does the pickup move to the inner/outer position using the
'UP'/'DOWN' key?

Yes

STEP 2

Laser ON?

Check from pins 7 and 8 of CNP5 via Q4 and pins 6 and 7 of
IC6 to pin 38 of IC2.

Yes

STEP 3

Focus search?

Yes

STEP 4

No

No

No

Check from pins 5 and 6 of CNP6 via pins 19, 20 and 21 of
IC5 to pin 41 of IC2.

No

Tracking servo?

Yes

No

Check from pins 21, 22 and 23 of IC6 to pin 24 of IC2.

No

Yes

Yes

Check the line of PU-IN SW.

Check from pin 2 of CNP6 via pin 25 of CNP1 to pin 94 of
IC901.

Check the line of the slide control.
Check from pins 3 and 4 of CNP6 via pins 17, 18 and 22 of
IC5 to pin 40 of IC2.

Focus search?

STEP 5

Check from pins 1 and 2 of CNP5 via pins 3, 4 and 5 of IC5 to
pins 31 and 34 of IC2.
Check from pins 2 and 5 of CNP7 to pins 4 and 5 of IC6.

RF signal

Check from pins 50 and 53 of IC2 to pins 24 and 28 of
CNP1.

No

AUDIO signal

Check from pins 3 and 4 of CNP5 via pins 1, 2 and 6 of IC5 to
pins 29 and 33 of IC2.
Check from pins 1, 3 and 4 of CNP7 to pins 2 and 3 of IC6.