Read Sharp XL-70 (serv.man5) Service Manual online
– 39 –
XL-60H/70H
• Laser failure.
Is 0V applied to the pin 57 (SEL) of IC802 ?
Yes
No
Does the laser come on when pattern cut between pin 8 (SEL) of
IC801 and pin 57 (SEL) of IC802 ?
IC801 and pin 57 (SEL) of IC802 ?
Check the PWB pattern between IC701 and IC802 (BUCK/CCE/
BUS0~3)
BUS0~3)
Yes
Yes
No
Check the peripheral parts of IC801 and Q801. If it is normal, the
optical pickup is faulty.
optical pickup is faulty.
No
Check BI802/CNS802. 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 43 (FEI) of IC802
when the disc is set?
when the disc is set?
Is the waveform shown above input at the pin 44 (SBAD) of
IC802?
IC802?
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 IC801 and BI802/CNS802. Is it normal?
No
Check the pattern between pin 13 of IC801 and pin 44 of IC802.
Check the periphery of IC801 and BI802/CNS802.
Check the periphery of IC801 and BI802/CNS802.
IC801 is faulty.
Yes
Is +6.2V applied to the emiter of Q861 ?
Is +5V applied to the collector of Q861 ?
Yes
No
No
Check the PWB pattern between pin 16 of CNS602 and emiter of
Q861.
Q861.
Check the peripheral parts of IC804 and Q861.
Is +5V applied to the pin 62 (VDD) of IC802 ?
Is +5V applied to the pin 1 (VCC) of IC801 ?
Yes
No
No
Check the PWB pattern between collector of Q861 and pin 62 of
IC802.
IC802.
Check the PWB pattern between collector of Q861 and pin 1 of
IC801.
IC801.
pin 43
(FEI)
pin 48
(FOO)
pin 44
(SBAD)
Yes
Yes
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