Read Sharp XL-55 (serv.man18) Service Manual online
– 41 –
XL-55H65H
• 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 28 (FOO) of IC801 ?
IC801 is faulty.
No
Yes
Yes
Is sawtooth wave obtained between pins 26 and 27 of IC804 ?
No
No
Check the PWB pattern
between pin 7 of IC804
and pin 60 (CD STB) of
IC701.
between pin 7 of IC804
and pin 60 (CD STB) of
IC701.
Is +5V applied to the pin 7
(MUTE) of IC804 ?
(MUTE) of IC804 ?
Check the PWB pattern between pin 28 (FOO) of IC801 and pins
24 and 25 of IC804. If OK. IC804 is faulty.
24 and 25 of IC804. If OK. IC804 is faulty.
Check the PWB pattern between pin 5 of CNS605 and IC804.
No
Is sawtooth wave obtained between pins 3 and 4 of CNW801/
CNS801 ? (as shown above)
CNS801 ? (as shown above)
Yes
Check the PWB pattern between CNW801/CNS801 and IC804.
No
CNW801/CNS801 connection failure or optical pickup failure.
Yes
• Spindle motor clv servo failure.
Is above wave obtained between pins 9 and 10 of IC804 ?
Is following wave output to the pin 11,12 of IC804 when the CD
TEST MODE "STEP 3" is changed to " STEP 4" ?
TEST MODE "STEP 3" is changed to " STEP 4" ?
No
Yes
Check the procedure in "HF ERROR".
If OK. IC801 is faulty.
If OK. IC801 is faulty.
Check the PWB pattern between pin 24,25 of IC801 and pins 9
and 10 of IC804. If OK. IC804 is faulty.
and 10 of IC804. If OK. IC804 is faulty.
No
Is above wave obtained between pins 5 and 6 of CNW801/
CNS801 ?
CNS801 ?
Yes
Check the PWB pattern between CNW801/CNS801 and IC804.
No
CNW801/CNS801 connection failure or optical pickup failure.
Yes
VO2
Yes
1.5~2.5sec
1.5~2.5sec
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