Sharp XL-3000 Service Manual download pdf (Page 40)

XL-3000/3000C

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Check the PWB pattern between emiter of Q607 and emiter of

Q861.

• Laser failure.

Is 0V applied to the pin 57 (SEL) of IC802 ?

Yes

Does the laser come on when pattern cut between pin 8 (SEL) of

IC801 and pin 57 (SEL) of IC802 ?

Check the PWB pattern between IC701 and IC802 (BUCK/CCE/

BUS0~3)

Yes

Check the peripheral parts of IC801 and Q801. If it is normal, the

optical pickup is faulty.

Check CNP802/CNW3. If it is normal, the optical pickup is

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?

Is the following waveform ouput at the pin 43 (FEI) of IC802

when the disc is set?

Is the waveform shown above input at the pin 44 (SBAD) of

IC802?

Yes

The optical pickup is faulty.

Check as stated in item "FOCUS SERVO SAWTOOTH WAVE

FAILURE".

Yes

Check the periphery of IC801 and CNP802/CNW3. Is it normal?

Check the pattern between pin 13 of IC801 and pin 44 of IC802.

Check the periphery of IC801 and CNP802/CNW3.

IC801 is faulty.

Yes

Is +6.2V applied to the emiter of Q861 ?

Is +5V applied to the collector of Q861 ?

Yes

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

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.

pin 43

(FEI)

pin 48

(FOO)

pin 44

(SBAD)

Yes

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Sharp XL-3000 Service Manual Page 40

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