Sharp GX-CD1200W GL Service Manual download pdf (Page 22)

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GX-CD1200W

• Focus servo sawtooth wave failure.

Is +8.1V applied to the pins 1 and 30 (VCC) of IC803 ?

Is sawtooh wave output to the pin 66 (FOO) of IC802 ?

IC802 is faulty.

Yes

Is sawtooth wave obtained between pins 20 and 21 of IC803 ?

Check the PWB pattern of IC803.

Is sawtooth wave obtained between pins 3 and 4 of BI801/

CNS801 ? (as shown above)

Yes

Check the PWB pattern between BI801/CNS801 and IC803.

BI801/CNS801 connection failure or optical pickup failure.

Yes

• Spindle motor clv servo failure.

Is above wave obtained between pins 5 and 6 of IC803 ?

Is following wave output to the pin 55 (AVSS) of IC802 when

the Function is changed to "PLAY" from "STOP" ?

Yes

Check the procedure in "HF ERROR".

If OK. IC802 is faulty.

Check the PWB pattern between pin 72 (DMO) of IC802 and pins

5 and 6 of IC803. If OK. IC803 is faulty.

Is above wave obtained between pins 5 and 6 of BI803/

CNS803 ?

Yes

Check the PWB pattern between BI803/CNS803 and IC803.

BI803/CNS803 connection failure or optical pickup failure.

Yes

DMO

1.5~2.5sec

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Sharp GX-CD1200W GL Service Manual Page 22