Read Sharp XL-65H (serv.man18) Service Manual online
XL-55H/65H
– 40 –
• Focus failure.
Does the optical pickup move up and down when the disc is
removed?
removed?
Is the following waveform output at the pin 32 (FE) of IC801
when the disc is set? (See Fig.37-1)
when the disc is set? (See Fig.37-1)
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 CNW802/CNS802. Is it normal?
IC802 is faulty.
• Laser failure.
Yes
No
Does the laser come on when pattern cut between pin 24 of IC802
and pin 40 of IC801 ?
and pin 40 of IC801 ?
Check the PWB pattern between IC701 and IC801 (MCLK/MLD/
MDATA/BL)
MDATA/BL)
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 CNW802/CNS802. If it is normal, the optical pickup is
faulty.
faulty.
Is approx. 2V applied to the collector of Q801.
Is +6.2V applied to the emitter of Q804 ?
Is +5V applied to the collector of Q804 ?
Yes
No
No
Check the PWB pattern between pin 5 of CNS605 and emitter of
Q804.
Q804.
Check the peripheral parts of IC804 and Q804.
Is +5V applied to the pin 3 (VCC) of IC802 ?
No
Check the PWB pattern between collector of Q804 and pin 3 of
IC802.
IC802.
Yes
Yes
Is 0V applied to the pin 40 of IC801 ?
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