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Thank you for your shop manual! Your help was very useful - the device is repaired! Once again - Thank you! I wish you a successful business! Edward (Russia).
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It was a great experience,instead of purchasing a new Stereo Amplifier ,in just minutes i repaired my old one and that was thaks to the manual I have purchased from you.
Thanks again.
Samuel Alter
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Das ging ja sehr unkompliziert hat bestens geklappt und die Quallität ist auch noch gut.
Vielen Dank dafür.
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Everything okay, thanks a lot. It was a pleasure for me to make a deal with you.
;
A deal without problems, very fast and the manual is a good quality. Sorry for the my english.
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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