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SHARP CDC423H
Service Manual


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

Description of SHARP CDC423H 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.

The manual is available in languages: English

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Text excerpt from page 38 (click to view)
CD-C423H

TROUBLESHOOTING (CD SECTION)
When the CD does not function
When the CD section does not operate When the objective lens of the optical pickup is dirty,this section may not operate.Clean the objective lens,and check the playback operation.When this section does not operate even after the above step is taken,check the following items. Remove the cabinet and follow the troubleshooting instructions. "Track skipping and/or no TOC(Table Of Contents) may be caused by build up of dust other foreign matter on the laser pickup lens. Before attempting any adjustment make certain that the lens is clean. If not, clean it as mentioned below." Turn the power off. Gently clean the lens with a lens cleaning tissue and a small amount of isopropyl alcohol. Do not touch the lens with the bare hand.

• When the turntable fails to stop.
Is from
5V 2.5V 0V

5 V till 2.5V down pulse (approx. 300 ms) No

Check the SWM3 and the wiring from the IC701 pin 21 to the SWM3.

input into the IC701 pin 21 when the turntable is rotating?

Yes Is there following voltage input on the IC701 pin 21 in the specific state? When the CD mechanism is moved up: 0V In other states: 4.3V Yes Check IC2 pin26 Q91 and Q93 and the periphery.

No

Check the MECHA UP SW and the wiring from the IC701 pin 21 to the MECHA UP SW.

Yes IC701 defective.

• When turntable fails to move.
Is there following voltage input on the IC701 pin 21 in the specific state? When the CD mechanism is moved up: 0V In other states: 4.3V

No

Check the MECHA UP SW and the wiring from the IC701 pin 21 to the MECHA UP SW.

Yes

Is L output from the IC2 pin 26 during SEC when the disc skip switch is pressed? No

Check the wiring of IC2 pin 26 and Q93 pin 2. OK

Yes IC2 defective. Is 4V output from the Q91 emitter during operation stated above? Yes Check Q91, Q93 and the periphery.

No

Check turntable motor and turntable mechanism.

– 37 –

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CDC423H SHARP
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Complete owner's manual in digital format. The manual will be available for download as PDF file aft…
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