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Service Manual

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

Description of JVC KDSX985 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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I needed a service manual as the display on my oscilloscope was very dim. I thought I'd give a try, as they advertised a huge number of manuals. Sure enough they had one listed. I bought it hoping it would be useful... actually, I bought it hoping it would be readable! I've had manuals from online sources in the past, and been very disappointed. Not this time! An excellent manual, complete, and very readable. Using it I fixed my 'scope, and as such the manual was an investment that paid off manyfold. Do I have any complaints? One very minor one - The circuit diagrams could have been scanned at a higher resolution, as some of the details were a little difficult to make out - not impossible, just not as easy as my old eyes would like! Overall, I'm very satisfied with my manual, and I will certainly be using this company again. Well done.

Text excerpt from page 21 (click to view)

Feed section
Is the voltage output at IC521 pin "40" 5V or 0V? YES Is 4V present at both sides of the feed motor? YES Check the feed motor. NO Is 6V or 2V present at IC561 "4" and "5"? NO Check IC561. NO Is the wiring for IC521 (56)~(64) correct? NO YES Is 3.3V present at IC561 pin "20"? YES Check the vicinity of IC521. YES Check the feed motor connection wiring. NO Check CD 8V and 5V.

Focus section
When the lens is moving: 4V
Does the S-search waveform appear at IC561 pins "8" and "9"?


Check the circuits in the vicinity of IC561 pins "8","9"and"15". YES


Check the pickup and its connections

Spindle section
Is the disk rotated? YES Does the RF signal appear at TP1? YES NO Is 4V present at IC561 pins "6" and "7"? YES Check the spindle motor and its wiring NO NO Is 4V present at IC521 pins "41" ? YES Check the vicinity of IC561. Check IC521 and IC501. NO

Is the RF waveform at TP1 Check the circuits in the distorted? NO vicinity of IC501 "19"~ "24" or the pickup YES Proceed to the Tracking section

Tracking section
When the disc is rotated at first:

Approx. 1.2V Is the tracking error signal output at IC501 "11"?

Check the circuit in the vicinity of IC501 pins "2"~"12".


Check the pickup and its connections

YES Check IC521.


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