Very,very good manual.It was very explicit and readble.It was helpfull.Thanks.
Text excerpt from page 39 (click to view)
XL-1500H
� Focus servo sawtooth wave failure.
Is sawtooh wave output to the pin 33 (FOO) of IC801 ? Yes
1.5~2.5sec
No
IC801 is faulty.
Is +7.0V applied to the pins 21 and 22 (VCC) of IC803 ? No Yes Is sawtooth wave obtained between pins 17 and 18 of IC803 ? Yes
1.5~2.5sec
Check the PWB pattern between pin emiter of Q605 and IC803.
No
Is +5V applied to the pin 7 (MUTE) of IC803 ? Yes
No
Check the PWB pattern between pin 7 of IC803 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
No
Check the procedure in "HF ERROR". If OK. IC801 is faulty.
Is above wave obtained between pins 1 and 2 of IC803 ? No Yes
Check the PWB pattern between pin 41 (DMO) of IC801 and pins 9 and 10 of IC803. If OK. IC803 is faulty.
Is above wave obtained between pins 9 and 12 of CNP801/ CNW801 ? Yes CNP801/CNW801 connection failure or optical pickup failure.
No
Check the PWB pattern between CNP801/CNW801 and IC803.
