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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 KDSX998R 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 25 (click to view)

3.3 Troubleshooting 3.3.1 Feed section

Is the voltage output at IC621 pin "40" 5V or 0V? YES Is 4V present at both sides of the feed motor? YES Check the feed motor.
3.3.2 Focus section


Is the wiring for IC681 pin 27? NO

YES Is 3.3V present at IC681 pin "20"? YES Check the vicinity of IC621. YES Check the feed motor connection wiring.

NO Check CD 8V and 5V.


Is 6V or 2V present at IC681 "4" and "5"? NO Check IC601.

When the lens is moving: 4V
Does the S-search waveform appear at IC681 pins "8" and "9"?


Check the circuits in the vicinity of IC681 pins "8","9"and"15". YES


Check the pickup and its connections

3.3.3 Spindle section

Is the disk rotated? YES Does the RF signal appear at RF test point? YES Is the RF waveform at RF test point distorted? YES Proceed to the Tracking section
3.3.4 Tracking section


Is 4V present at IC681 pins "6" and "7"? YES


Is 4V present at IC621 pins "41" ? YES Check the vicinity of IC561.


Check the spindle motor and its wiring NO Check the circuits in the NO vicinity of IC681 "19"~ "24" or the pickup

Check IC621 and IC681.

When the disc is rotated at first:

Approx. 1.2V Is the tracking error signal output at IC601 "11"?

Check the circuit in the vicinity of IC501 pins "2"~"7".


Check the pickup and its connections

YES Check IC621.


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