Read Sharp QT-CD180 (serv.man5) Service Manual online
QT-CD180H/QT-CD180W
– 21 –
• Laser failure.
Yes
No
Check the laser come on when pattern cut between pin 8 (SEL) of
IC801 and pin 74 (SEL) of IC802.
IC801 and pin 74 (SEL) of IC802.
Yes
No
Check the peripheral parts of IC801 and Q801. If it is normal, the
optical pickup is faulty.
optical pickup is faulty.
Check BI801/CNS801. If it is normal, the optical pickup is
faulty.
faulty.
Is approx. 1.8V applied to the collector of Q801.
Is +5V applied to the emitter of Q204 ?
Is +5V applied to the collector of Q204 ?
Yes
No
No
Check the PWB pattern of Q204.
Check the peripheral parts of IC803 and Q204.
Is +5V applied to the pin 75 (VDD) of IC802 ?
Is +5V applied to the pin 1 (VCC) of IC801 ?
Yes
No
No
Check the PWB pattern between collector of Q204 and pin 75 of
IC802.
IC802.
Check the PWB pattern between collector of Q204 and pin 1 of
IC801.
IC801.
Yes
Yes
Is +0V applied to the pin 74 (SEL) of IC802 ?
Check the pickup-in switch (SW702) position.
Check the Focus system.
Yes
• The CD function will not work.
The CD operating keys don't work.
Check the power supply, 16.93 MHz clock, and reset terminal.
Yes
Yes
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