SHARP XL70H
Manual de Servicio

XL-60H/70H
� Laser failure.
Is +6.2V applied to the emiter of Q861 ? No Yes Check the PWB pattern between pin 16 of CNS602 and emiter of Q861.

Is +5V applied to the collector of Q861 ? Yes

No

Check the peripheral parts of IC804 and Q861.

Is +5V applied to the pin 62 (VDD) of IC802 ? No Yes Is +5V applied to the pin 1 (VCC) of IC801 ? No Yes

Check the PWB pattern between collector of Q861 and pin 62 of IC802.

Check the PWB pattern between collector of Q861 and pin 1 of IC801.

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 ? Yes

No Check the PWB pattern between IC701 and IC802 (BUCK/CCE/ BUS0~3) Is approx. 2V applied to the collector of Q801. Yes Check BI802/CNS802. If it is normal, the optical pickup is faulty. Check the peripheral parts of IC801 and Q801. If it is normal, the optical pickup is faulty.

No

� Focus failure.
Does the optical pickup move up and down when the disc is removed? Yes Is the following waveform ouput at the pin 43 (FEI) of IC802 when the disc is set? Yes
pin 43 (FEI)

No

Check as stated in item "FOCUS SERVO SAWTOOTH WAVE FAILURE".

Check the periphery of IC801 and BI802/CNS802. Is it normal? No Yes The optical pickup is faulty.

pin 48 (FOO)

pin 44 (SBAD)

Is the waveform shown above input at the pin 44 (SBAD) of IC802? Yes IC801 is faulty.

No

Check the pattern between pin 13 of IC801 and pin 44 of IC802. Check the periphery of IC801 and BI802/CNS802.

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