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Thanks for offering this item at such a good price. Proved handy in identifying the part I was looking for my set.
Thanks again.
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This is the original manufacturers service manual, with detailed info on the circit boards, explosion drawings of all parts in assembly order, and tuning instructions. The only thing missing is the information on the dimensions of the various drive belts. mail me if you need them. gcrossman_at_aol.com
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Ordered service manuel for a hard to find plasma tv - your company made it easy to find and purchase - I will use you again
Thanks for your help
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This is a high quality manual with clear schematic and components layout diagrams ; with service procedure included.
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This service manual for the Kenwood KT-990D was reproduced really well ,is very legible and manual is complete.Combined with the low price paid,in the future,I will be checking Owner-Manuals.com any time I need a manual.
3.2
Troubleshooting
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. NO Is 6V or 2V present at IC681 "16" and "17"? NO Check IC681. NO Is the wiring for IC621 pin "40"? NO YES Is 3.3V present at IC681 pin "6"? YES Check the vicinity of IC621. YES Check the feed motor connection wiring. Check CD 8V and 5V. NO
Focus section
When the lens is moving: 4V
Does the S-search waveform appear at IC681 pins "13" and "14"?
NO
Check the circuits in the vicinity of IC681 pins "13","14"and"1". YES
YES
Check the pickup and its connections
Spindle section
Is the disk rotated? YES Does the RF signal appear at IC601 pin "19"? YES Is the RF waveform at IC601 pin "19" distorted? YES Proceed to the Tracking section NO Is 4V present at IC681 pins "15" and "16"? YES Check the spindle motor and its wiring NO Check the circuits in the NO vicinity of IC601 pin "19" or the pickup NO Is 4V present at IC621 pins "41" ? YES Check the vicinity of IC681. NO
Check the circuits in the vicinity of IC621 or IC621
Tracking section
When the disc is rotated at first:
YES
Approx. 1.2V Is the tracking error signal output at IC601 "11"?
Check the circuit in the vicinity of IC601 pins "2" to "7".
YES
Check the pickup and its connections
YES Check IC621.
(No.49839)1-25
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