Sharp XL-3000 Manuel de service télécharger pdf (Page 41)

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XL-3000/3000C

• Focus servo sawtooth wave failure.

Is +6.2V applied to the pins 21 and 22 (VCC) of IC804 ?

Is sawtooh wave output to the pin 48 (FOO) of IC802 ?

IC802 is faulty.

Yes

Is sawtooth wave obtained between pins 26 and 27 of IC804 ?

Check the PWB pattern

between pin 7 of IC804

and pin 60 (CD STB) of

IC701.

Is +5V applied to the pin 7

(MUTE) of IC804 ?

Check the PWB pattern between pin 48 (FOO) of IC802 and pins

24 and 25 of IC804. If OK. IC804 is faulty.

Check the PWB pattern between emiter of Q607 and IC804.

Is sawtooth wave obtained between pins 13 and 16 of

CNP802/CNW3 ? (as shown above)

Yes

Check the PWB pattern between CNP802/CNW3 and IC804.

CNP802/CNW3 connection failure or optical pickup failure.

Yes

• Spindle motor clv servo failure.

Is above wave obtained between pins 11 and 12 of IC804 ?

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

the CD TEST MODE "STEP 3" is changed to " STEP 4" ?

Yes

Check the procedure in "HF ERROR".

If OK. IC802 is faulty.

Check the PWB pattern between pin 55 (DMO) of IC802 and pins

9 and 10 of IC804. If OK. IC804 is faulty.

Is above wave obtained between pins 9 and 12 of CNP802/

CNW3 ?

Yes

Check the PWB pattern between CNP802/CNW3 and IC804.

CNP802/CNW3 connection failure or optical pickup failure.

Yes

DMO

Yes

1.5~2.5sec

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Sharp XL-3000 Manuel de service Page 41