Sharp XL 1700 Service Manual - Page 38

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

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Page 38 highlights

XL-1700/1700C • Focus servo sawtooth wave failure. Is sawtooh wave output to the pin 33 (FOO) of IC801 ? Yes 1.5~2.5sec IC801 is faulty. No Is +7.0V applied to the pins 21 and 22 (VCC) of IC803 ? Yes Check the PWB pattern between pin emitter of Q605 and IC803. No Is sawtooth wave obtained between pins 17 and 18 of IC803 ? No Yes 1.5~2.5sec Is +5V applied to the pin 7 Check the PWB pattern (MUTE) of IC803 ? No between pin 7 of IC803 Yes and pin 66 (CD STB) of IC701. Check the PWB pattern between pin 33 (FOO) of IC801 and pins 19 and 20 of IC803. If OK. IC803 is faulty. Is sawtooth wave obtained between pins 13 and 16 of CNP801/CNW801 ? (as shown above) Yes CNP801/CNW801 connection failure or optical pickup failure. Check the PWB pattern between CNP801/CNW801 and IC803. No • Spindle motor clv servo failure. Is following wave output to the pin 41 (DMO) of IC801 when the CD TEST MODE "STEP 3" is changed to " STEP 4" ? Yes DMO Check the procedure in "HF ERROR". No If OK. IC801 is faulty. Is above wave obtained between pins 1 and 2 of IC803 ? Yes Check the PWB pattern between pin 41 (DMO) of IC801 and pins No 9 and 10 of IC803. If OK. IC803 is faulty. Is above wave obtained between pins 9 and 12 of CNP801/ CNW801 ? No Yes CNP801/CNW801 connection failure or optical pickup failure. Check the PWB pattern between CNP801/CNW801 and IC803. - 38 -

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XL-1700/1700C
– 38 –
• Focus servo sawtooth wave failure.
Is +7.0V applied to the pins 21 and 22 (VCC) of IC803 ?
Is sawtooh wave output to the pin 33 (FOO) of IC801 ?
IC801 is faulty.
No
Yes
Yes
Is sawtooth wave obtained between pins 17 and 18 of IC803 ?
No
No
Check the PWB pattern
between pin 7 of IC803
and pin 66 (CD STB) of
IC701.
Is +5V applied to the pin 7
(MUTE) of IC803 ?
Check the PWB pattern between pin 33 (FOO) of IC801 and pins
19 and 20 of IC803.
If OK.
IC803 is faulty.
Check the PWB pattern between pin emitter of Q605 and IC803.
No
Is sawtooth wave obtained between pins 13 and 16 of
CNP801/CNW801 ?
(as shown above)
Yes
Check the PWB pattern between CNP801/CNW801 and IC803.
No
CNP801/CNW801 connection failure or optical pickup failure.
Yes
• Spindle motor clv servo
failure.
Is above wave obtained between pins 1 and 2 of IC803 ?
Is following wave output to the pin 41 (DMO) of IC801 when
the CD TEST MODE "STEP 3" is changed to " STEP 4" ?
No
Yes
Check the procedure in "HF ERROR".
If OK.
IC801 is faulty.
Check the PWB pattern between pin 41 (DMO) of IC801 and pins
9 and 10 of IC803.
If OK.
IC803 is faulty.
No
Is above wave obtained between pins 9 and 12 of CNP801/
CNW801 ?
Yes
Check the PWB pattern between CNP801/CNW801 and IC803.
No
CNP801/CNW801 connection failure or optical pickup failure.
Yes
DMO
Yes
1.5~2.5sec
1.5~2.5sec