QT-CD250H/W
� Track search failure
Does the sled motor run in FF/REW state when the CD TEST MODE is set? Yes Is the following wave output to the pin 67 (TRO) of IC802 during track search in normal playback? Yes
TRO
No
Check as stated in item "SLED MOTOR OPERATION FAILURE".
IC802 failure. No
Is the following wave output to the pins 12 (TEO) of IC801 during track search in normal playback? Yes
TEO TEI TEZI
No
Check the PWB pattern between pin 67 (TRO) of IC802 and pin 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 (TEI) and 65 (TEZI) of IC802. If OK. IC801 failure.
Is the above wave output to the pins 64 (TEI) and 65 (TEZI) of IC802 during track serch in normal playback? Yes Is the following wave output to the pin 60 (RFZI) and 61 (RFRP) of IC802 during track search in normal playback? Yes
RFRP
No
No
Check the PWB pattern between pin 22 (RFO) and 18 (RFIS), 17 (RFRP) of IC801 and pins 60 and 61 of IC802. If OK. IC801 failure.
RFZI
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? Yes FF REW
FMO
IC802 is faulty. No
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? Yes
SL ± FF REW
No
Check the PWB pattern between pin 71 of IC802 and pins 12 and 13 of IC803.
Is sled feed signal output the pins 10 and 11 of IC803? 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.
No
Check the peripheral parts of IC803. If OK, IC803 is faulty.
No
Check the BI803/CNS803.
� Sled servo failure.
Is following sled signal output the pin 71 (FMO) of IC802 during playback? Yes
FMO
