Sharp XL-30H Service Manual page 40

XL-30H/30W
• Laser failure.
Is +6.2V applied to the emitter of Q861 ?
Yes
Is +5V applied to the collector of Q861 ?
Yes
Is +5V applied to the pin 62 (VDD) of IC802 ?
Yes
Is +5V applied to the pin 1 (VCC) of Ic801 ?
Yes
Is 0V applied to the pin 57 (SEL) of IC802 ?
Yes
Is approx. 2V applied to the collector of Q801.
Yes
Check BI802/CNS802. If it is normal, the optical pickup is
faulty.
• Focus failure.
Does the optical pickup move up and down when the disc is
removed?
Yes
Is the following waveform output at the pin 43 (FEI) of IC802
when the disc is set?
Yes
pin 43
(FEI)
pin 48
(FOO)
pin 44
(SBAD)
Is the waveform shown above input at the pin 44 (SBAD) of
IC802?
Yes
IC801 is faulty.
All manuals and user guides at all-guides.com
Check the PWB pattern between pin 16 of CNS602 and emitter of
No
Q861.
Check the peripheral parts of IC804 and Q861.
No
Check the PWB pattern between collector of Q861 and pin 62 of
No
IC802.
Check the PWB pattern between collector of Q861 and pin 1 of
No
IC801.
Does the laser come on when pattern cut between pin 8 (SEL) of
No
IC801 and pin 57 (SEL) of IC802 ?
No
Check the PWB pattern between IC701 and IC802 (BUCK/CCE/
BUS0~3)
Check the peripheral parts of IC801 and Q801. If it is normal, the
No
optical pickup is faulty.
Check as stated in item "FOCUS SERVO SAWTOOTH WAVE
No
FAILURE".
Check the periphery of IC801 and BI802/CNS802. Is it normal?
No
The optical pickup is faulty.
Check the pattern between pin 13 of IC801 and pin 44 of IC802.
No
Check the periphery of IC801 and BI802/CNS802.
– 40 –
Yes
Yes