Sharp XL-30H Service Manual page 41

• Focus servo sawtooth wave failure.
Is sawtooh wave output to the pin 48 (FOO) of IC802 ?
Yes
Is +6.2V applied to the pins 1 and 30 (VCC) of IC804 ?
Yes
Is sawtooth wave obtained between pins 25 and 26 of IC804 ?
Yes
1.5~2.5sec
Is sawtooth wave obtained between pins 3 and 4 of BI801/
CNS801 ? (as shown above)
Yes
BI801/CNS801 connection failure or optical pickup failure.
• 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 5 and 6 of IC804 ?
Yes
Is above wave obtained between pins 5 and 6 of BI801/
CNS801 ?
Yes
BI801/CNS801 connection failure or optical pickup failure.
All manuals and user guides at all-guides.com
1.5~2.5sec
IC802 is faulty.
No
Check the PWB pattern between pin 16 of CNS602 and IC804.
No
Is +5V applied to the pin 2
No
(MUTE) of IC804 ?
Yes
Check the PWB pattern between pin 48 (FOO) of IC802 and pins
27 and 28 of IC804. If OK. IC804 is faulty.
Check the PWB pattern between BI801/CNS801 and IC804.
No
Check the procedure in "HF ERROR".
No
If OK. IC802 is faulty.
Check the PWB pattern between pin 55 (DMO) of IC802 and pins
No
5 and 6 of IC804. If OK. IC804 is faulty.
Check the PWB pattern between BI801/CNS801 and IC804.
No
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XL-30H/30W
Check the PWB pattern
between pin 2 of IC804
No
and pin 58 (CD STB) of
IC701.