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SHARP MDDR480H
Service Manual


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

Description of SHARP MDDR480H 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 42 (click to view)
MD-DR470H/MD-DR480H
� Abnormal display
Is a waveform found in pins 8 to 10 of CN451 ? Is pin 2 (VCC) and pin 6 (GND) of CN451 normal ? No Check between IC401 and CN451. Check around IC401. Is a waveform found in pins 29 to 31 of IC401 ? Yes Yes No

Check the pattern and soldering of SW flexible PWB and LCD flexible PWB. If no problem is found, replace the LCD.

� Audio playback circuit
If playback time is counted but no sound is heard during continuous playback. Is an audio waveform found in pins 1 (TP721), 2 (TP722), 3 (TP723) and 4 (TP724) of J703 ? No Is there a pulse where duty varies in pins 2 and 5 of Q751, Q752, Q761 and Q762 ? No Is a pulse waveform found in pins 1, 4, 9 and 12 of IC751 and pins 1, 4, 9 and 12 of IC761 ? Are pins 2, 5, 10 and 13 of IC751 H ? Check pins 68, 69, 71 and 72 of IC201 and pin 19 of IC401. If the voltage of pin 6 of Q751 and Q752 and pin 3 of Q761 and Q762 is below 2 V when setting VOLUME to MAX, check the power supply circuit of IC813 and IC821. Check soldering of J703, the remote control and the earphones. Yes

Yes

No

� The spindle motor does not rotate.

Does a waveform appear in pins 26 and 27 of IC201 after ending the test mode AUTO2 ? Yes

No

Check the periphery of IC201.

Is a waveform found in pins 60 to 64 of IC601 ? Yes If there is no defect in soldering of IC601 and insertion of the flexible PWB, replace the spindle motor.

No

Check the periphery of IC601.

� 42 �

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