• Track search failure
Does the sled motor run in FF/REW state when the SERVO TEST MODE "STEP1" is set?
Yes
Is the following wave output to the pin 49 (TRO) of IC802 during track search in normal playback?
Yes
TRO
Is the following wave output to the pins 12 (TEO) of IC801 during track search in normal playback?
Yes
TEO
TEI
TEZI
Is the above wave output to the pins 46 (TEI) and 47 (TEZI) of IC802 during track search in normal playback?
Yes
Is the following wave output to the pin 41 (RFZI) and 42 (RFRP) of IC802 during track search in normal playback?
Yes RFRP
RFZI
Normal.
• Sled motor operation failure.
Is following sled feed signal output the pin 53 (FMO) of IC802
when FF 
/REW 
key is pressed after the CD TEST MODE "STEP 1" is set?
Yes |
| FF | REW |
| FMO |
|
|
|
|
|
|
Is following sled feed signal output the pins 3 and 4 of IC804
when FF 
/REW 
key is pressed after the CD TEST MODE "STEP 1" is set?
Yes | FF | REW |
|
|
SL ±
Is sled feed signal output the pins 1 and 2 of IC804?
Yes
Is sled feed voltage applied between both terminals of sled motor?
Yes
Check the CD mechanism (periphery of sled motor).
If the sled motor does not run when DC2.0V is applied to both terminals of sled motor, the sled motor is faulty.
• Sled servo failure.
Is following sled signal output the pin 53 (FMO) of IC802 during playback?
Yes
FMO
Normal.
Check as stated in item "SLED MOTOR OPERATION FAILURE".
No
IC802 failure.
No
| Check the PWB pattern between pin 49 (TRO) of IC802 and pin |
|
No |
| |
19 of IC804. |
| |
|
| |
| Check the PWB pattern between pins 17 and 18 of IC804 and |
|
|
| |
| Optical pickup. |
|
| If OK. Optical pickup failure. |
|
|
|
|
|
|
|
| Check the PWB pattern between pin 12 (TEO) of IC801 and pins 46 |
|
No |
| |
and 47 of IC802. If OK. IC801 failure. |
| |
|
|
|
No | Check the PWB pattern between pin 17 (RFO) and 18 (RFIS), 19 | |
(RFRP) of IC801 and pins 41 and 42 of IC802. If OK. IC801 failure. | ||
|
C802 is faulty.
No
No | Check the PWB pattern between pin 53 of IC802 and pins 3 and 4 | |
of IC804. | ||
|
Check the peripheral parts of IC804. If OK, IC804 is faulty.
No
Check the CNW803/CNS803.
No
IC802 is faulty.
No
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