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SHARP QTCD250WS
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of SHARP QTCD250WS Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

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Text excerpt from page 23 (click to view)
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

IC802 is faulty. No

Normal.

� 23 �

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