• Focus servo sawtooth wave failure.
Is sawtooth wave output to the pin 48 (FOO) of IC802 ?
Yes
1.5~2.5sec
No
IC802 is faulty.
Is +6.2V applied to the pins 21 and 22 (VCC) of IC804 ?
Yes
Is sawtooth wave obtained between pins 26 and 27 of IC804 ?
Yes
1.5~2.5sec
Is sawtooth wave obtained between pins 13 and 16 of CNP802/CNW3 ? (as shown above)
Yes
CNP802/CNW3 connection failure or optical pickup failure.
Check the PWB pattern between emitter of Q607 and IC804.
| No |
|
|
|
| |
|
|
|
|
| ||
|
|
|
|
|
| |
|
|
| Is +5V applied to the pin 7 |
| Check the PWB pattern | |
| No |
| ||||
| (MUTE) of IC804 ? | No | between pin 7 of IC804 | |||
|
|
|
| Yes |
| and pin 60 (CD STB) of |
|
|
|
|
|
| IC701. |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Check the PWB pattern between pin 48 (FOO) of IC802 and pins 24 and 25 of IC804. If OK. IC804 is faulty.
Check the PWB pattern between CNP802/CNW3 and IC804.
No
• Spindle motor clv servo failure.
Is following wave output to the pin 55 (DMO) of IC802 when the CD TEST MODE "STEP 3" is changed to " STEP 4" ?
Yes
DMO
Is above wave obtained between pins 11 and 12 of IC804 ?
Yes
Is above wave obtained between pins 9 and 12 of CNP802/ CNW3 ?
Yes
CNP802/CNW3 connection failure or optical pickup failure.
No | Check the procedure in "HF ERROR". |
If OK. IC802 is faulty. |
No | Check the PWB pattern between pin 55 (DMO) of IC802 and pins | |
9 and 10 of IC804. If OK. IC804 is faulty. | ||
|
Check the PWB pattern between CNP802/CNW3 and IC804.
No
– 45 –
