Sharp XL-1200 Service Manual page 32

XL-1200/1200C
• Track search failure
Does the sled motor run in FF/REW state when the SERVO
TEST MODE "STEP1" is set?
Yes
Is the following wave output to the pin 49 (TRO) of IC802
during track search in normal playback?
Yes
Is the following wave output to the pins 12 (TEO) of IC801
during track search in normal playback?
Yes
Is the above wave output to the pins 46 (TEI) and 47 (TEZI) of
IC802 during track serch in normal playback?
Yes
Is the following wave output to the pin 41 (RFZI) and 42
(RFRP) of IC802 during track search in normal playback?
Yes
Normal.
• Sled motor operation failure.
Is following sled feed signal output the pin 53 (FMO) of IC802
when FF /REW key is pressed after the CD TEST
MODE "STEP 1" is seted?
Yes
Is following sled feed signal output the pins 3 and 4 of IC804
when FF /REW key is pressed after the CD TEST
MODE "STEP 1" is seted?
Yes
Is sled feed signal output the pins 1 and 2 of IC804?
Yes
Is sled feed voltage applied between both terminals of sled
motor?
Yes
Check the CD mechanism (periphery of sled motor).
If the sled motor does not run when DC2.0V is applied to
both terminals of sled motor, the sled motor is faulty.
• Sled servo failure.
Is following sled signal output the pin 53 (FMO) of IC802
during playback?
Yes
Normal.
TRO
TEO
TEI
TEZI
RFRP
RFZI
FF REW
FMO
FF REW
SL ±
FMO
Check as stated in item "SLED MOTOR OPERATION FAILURE".
No
IC802 failure.
No
Check the PWB pattern between pin 49 (TRO) of IC802 and pin
No
19 of IC804.
Check the PWB pattern between pins 17 and 18 of IC804 and
Optical pickup.
If OK. Optical pickup failure.
Check the PWB pattern between pin 12 (TEO) of IC801 and pins 46
No
and 47 of IC802. If OK. IC801 failure.
Check the PWB pattern between pin 17 (RFO) and 18 (RFIS), 19
No
(RFRP) of IC801 and pins 41 and 42 of IC802. If OK. IC801 failure.
C801 is faulty.
No
Check the PWB pattern between pin 53 of IC802 and pins 3 and 4
No
of IC804.
Check the peripheral parts of IC804. If OK, IC804 is faulty.
No
Check the CNW803/CNS803.
No
IC802 is faulty.
No
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