Sharp QT-CD210H(BL) Serivce Manual page 21

• Track search failure
Does the sled motor run in FF/REW state when the CD
TEST MODE is set?
Is the following wave output to the pin 67 (TRO) of IC802
during track search in normal playback?
Is the following wave output to the pins 12 (TEO) of IC801
during track search in normal playback?
Is the above wave output to the pins 64 (TEI) and 65 (TEZI)
of IC802 during track serch in normal playback?
Is the following wave output to the pin 60 (RFZI) and 61
(RFRP) of IC802 during track search in normal playback?
Normal.
• Sled motor operation failure.
Is following sled feed signal output the pin 71 (FMO) of IC802
when FF/REW key is pressed after the CD TEST MODE is
seted?
Is following sled feed signal input the pins 12 and 13 of IC803
when FF/REW key is pressed after the CD TEST MODE is
seted?
Is sled feed signal output the pins 10 and 11 of IC803?
Is sled feed voltage applied between both terminals of sled
motor?
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 71 (FMO) of IC802
during playback?
Normal.
Yes
Yes
TRO
Yes
TEO
TEI
TEZI
Yes
Yes
RFRP
RFZI
Yes
FF REW
FMO
Yes FF REW
SL ±
Yes
Yes
Yes
FMO
Check as stated in item "SLED MOTOR OPERATION FAILURE".
No
IC802 failure.
No
Check the PWB pattern between pin 67 (TRO) of IC802 and pin
No
28 of IC803.
Check the PWB pattern between pins 25 and 26 of IC803 and
Optical pickup.
If OK. Optical pickup failure.
Check the PWB pattern between pin 12 (TEO) of IC801 and pins 64
No
(TEI) and 65 (TEZI) of IC802. If OK. IC801 failure.
Check the PWB pattern between pin 22 (RFO) and 18 (RFIS), 17
No
(RFRP) of IC801 and pins 60 and 61 of IC802. If OK. IC801 failure.
IC802 is faulty.
No
Check the PWB pattern between pin 71 of IC802 and pins 12 and
No
13 of IC803.
Check the peripheral parts of IC803. If OK, IC803 is faulty.
No
Check the BI803/CNS803.
No
IC802 is faulty.
No
– 21 –
QT-CD210H/W