Read Sharp XL-1500 (serv.man4) Service Manual online
XL-1500H
– 38 –
Check the PWB pattern between emiter of Q605 and CNP805/
CNW805.
CNW805.
• Laser failure.
Is 0V applied to the pin 38 (SEL) of IC801 ?
Yes
No
Does the laser come on when pattern cut between pin 8 (SEL) of
IC802 and pin 38 (SEL) of IC801 ?
IC802 and pin 38 (SEL) of IC801 ?
Check the PWB pattern between IC701 and IC801 (BUCK/CCE/
BUS0~3)
BUS0~3)
Yes
Yes
No
Check the peripheral parts of IC802 and Q801. If it is normal, the
optical pickup is faulty.
optical pickup is faulty.
No
Check CNP801/CNW801. If it is normal, the optical pickup is
faulty.
faulty.
Is approx. 2V applied to the collector of Q801.
• Focus failure.
Does the optical pickup move up and down when the disc is
removed?
removed?
Is the following waveform ouput at the pin 29 (FEI) of IC801
when the disc is set?
when the disc is set?
Is the waveform shown above input at the pin 30 (SBAD) of
IC801?
IC801?
Yes
Yes
No
No
The optical pickup is faulty.
Check as stated in item "FOCUS SERVO SAWTOOTH WAVE
FAILURE".
FAILURE".
Yes
Check the periphery of IC802 and CNP801/CNW801. Is it normal?
No
Check the pattern between pin 12 of IC802 and pin 30 of IC801.
Check the periphery of IC802 and CNP801/CNW801.
Check the periphery of IC802 and CNP801/CNW801.
IC802 is faulty.
Yes
Is +7.2V applied to the pin 1 of CNW805 ?
Is +5V applied to the cathode side of ZD801 ?
Yes
No
No
Check the peripheral parts of ZD801,C802 and C821.
Is +5V applied to the pin 64 (VDD) of IC801 ?
Is +3.3V applied to the pin 1 (VCC) of IC802 ?
Yes
No
No
Check the PWB pattern between cathode side of ZD801 and pin
64 of IC801.
64 of IC801.
Check the PWB pattern between collector of Q802 and pin 1 of
IC802.
IC802.
pin 29
(FEI)
pin 33
(FOO)
pin 30
(SBAD)
Yes
Yes
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