Sharp XL-3000V - Manual (Page 45)

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XL-3000V
• Focus servo sawtooth wave failure.
Is +6.2V applied to the pins 21 and 22 (VCC) of IC804 ?
Is sawtooth wave output to the pin 48 (FOO) of IC802 ? IC802 is faulty.
No
Yes
Yes
Is sawtooth wave obtained between pins 26 and 27 of IC804 ?
No No
Check the PWB pattern
between pin 7 of IC804
and pin 60 (CD STB) of
IC701. Is +5V applied to the pin 7
(MUTE) of IC804 ?
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 emitter of Q607 and IC804.
No
Is sawtooth wave obtained between pins 13 and 16 of
CNP802/CNW3 ? (as shown above)
Yes
Check the PWB pattern between CNP802/CNW3 and IC804.
No
CNP802/CNW3 connection failure or optical pickup failure.
Yes
• Spindle motor clv servo failure.
Is above wave obtained between pins 11 and 12 of IC804 ?
Is following wave output to the pin 55 (DMO) of IC802 when
the CD TEST MODE "STEP 3" is changed to " STEP 4" ?
No
Yes
Check the procedure in "HF ERROR".
If OK. IC802 is faulty.
Check the PWB pattern between pin 55 (DMO) of IC802 and pins
9 and 10 of IC804. If OK. IC804 is faulty.
No
Is above wave obtained between pins 9 and 12 of CNP802/
CNW3 ?
Yes
Check the PWB pattern between CNP802/CNW3 and IC804.
No
CNP802/CNW3 connection failure or optical pickup failure.
Yes
DMO
Yes
1.5~2.5sec
1.5~2.5sec