Trouble Shooting - Kenwood RD-M23 Service Manual

Compact audio system
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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 off the power, and wipe the lens softly using a cleaning paper moistened with commercially available cleaning solution so
as not to damage it.
Be careful not to touch the lens with bare hands.
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 player or on computer CD ROM drives.
All rights reserved. Unauthorized duplicating, broadcasting and renting product is prohibited by law.
Cleaner Liquid
Make sure that the disc is normal, and set the CD TEST MODE (STEP 1).
Is the measured voltage as specified in circuit diagram?
Is "Er-CD01" displayed"?
Move the pickup to most internal circumference side of disc.
Turn the power off and reset the CD TEST MODE (STEP 1).
Is "PU ERROR " not displayed?
Is +5V applied to pin 100 (/RST) of IC802?
Does the CD TEST MODE advance from "STEP 2"?
Does the laser come on in CD TEST MODE "STEP 2"?
Does the CD TEST MODE advance from "STEP 3" to "STEP
4"?
Does the spindle motor rotate normally when the CD TEST
MODE changes from "STEP 4" to "STEP 3"?
Cleaning Disc
PARTS CODE: UDSKA0004AFZZ
Is the HF output on pin 38 of IC802 in CD TEST MODE "STEP 5"?
Does the sound heard when the optical pickup move to the
selected play by the FF
Does the LCD track number and time indicator work properly ?
Turn the power off and then back on.
Does the unit initialize properly and start playback when PLAY
key is pressed?
Does the unit play in order in the FF mode?
Does playback continue for 30 seconds after the start of
playback ?
Normal
Check the main unit power supply circuit.
No
Yes
No
Yes
Check the pattern between pin 58 (PU_IN) of IC701 and
No
CNW803/CNS803.
Check the between CNW803/CNS803 and PU-IN switch.
Yes
Check the PWB pattern between pin 59 (CD_RES) of IC701 and
No
pin 100 (/RST) of IC802.
Yes
Is CD Lid switch SW802
No
ON condition ?
Yes
Yes
Check the between pattern IC701 and SW802 If OK.
Check the main unit power supply circuit.
Check the procedure in "LASER FAILURE".
No
Yes
Check the procedure in "FOCUS FAILURE".
No
Yes
Check the procedure in "SPINDLE MOTOR CLV SERVO
No
FAILURE".
Yes
Check the procedure "HF ERROR".
No
Yes
Does the sled motor
No
/REW
key.
move ?
Yes
Yes
Check the procedure "NO SOUND"
Check the pattern between IC701 and LCD701.
No
Yes
Is "Er-CD01 "
No
displayed ?
Yes
Yes
Check the pattern between pin 58 (PU_IN) of IC701
and CNW803/CNS803. Check the between CNW803/
CNS803 and PU-IN switch.
Check the procedure in "TRACK SEARCH FAILUR".
No
Yes
Check the procedure in "SLED SERVO FAILURE".
No
Yes
Set ON condition the CD
No
Lid switch.
Check the procedure in
No
"SLED MOTOR
OPERATING FAILURE ".
Check the procedure in
No
"HF ERROR".

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