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There are currently no product reviews.
 ;
Thanks you very much for this "hard to find" service manual.
Will help a lot in repairing this receiver.
;
Thanks you very much for this "hard to find" service manual.
Will help a lot in repairing this receiver.
;
Thanks you very much for this "hard to find" service manual.
Will help a lot in repairing this tuner.
;
I have this hi-fi system for a long time and I need to repair some things. Founding this manual will be very helpfull :)
 ;
It is pretty good. The schematics were covered all components, the manual also provide the parts list . It's useful for the trouble shooting.
NO.10 FLOW CHART NO.11
The cassette tape fails to eject. No power is turned on.
See FLOW CHART NO.12.
pin(4) of IC701 change from "L" to
YES
Does the capstan motor start when NO Check IC701. the EJECT button is pressed? "H" level?
NO Does power control(H) signal at
YES
Does the take-up turn when NO disk reel drive unit. Does base of Q951 change from NO Check IC701 and all the way up thru the capstan motor is running? about 5.0V 4.5V? to Q951. Check take-up reel sensor and all the NO Are pulses applied at pin(2) of IC701
YES
YES
way up thru to IC701. Check Q951 and the AT 5V line. when the take-up reel disk is turning? Q951?
Is 5V sent out the collector of
YES
NO
Check pin(90) of IC701. soldering. pin(12) of IC706 when a reel pules
Check periperal circuits for poor Is a "H"(about 1.7V) level applied at
has been inputted?
YES
Check IC706.
NO Is the voltage about 10V sent out of
FLOW CHART NO.12
pin(15) of IC706?
YES The capstan motor fails to run.
Is specified voltage applied at NO Check between IC706 and all the motor terminal? way up thru to the loading motor.
41
DC given out pin(29) of IC701.
YES
YES Is the voltage more than about 2.6V NO
Check IC701.
Dose the motor run? Replace loading motor.
NO
NO YES Is the supply voltage of 5V feed to
pin(8) of AC connector?
YES NO YES
Check PC 5V line.
Replace cassette cam, gear, etc.
Check between the AC connector Is the voltage more than 2.6V DC and all the way up thru to pin(29) sent in pin(4) of AC connector? of IC701. Check between the pin(92) of IC701 Is the voltage at pin(3) of AC NO and all the way up thru to pin(3) of connector 1.6~2.7V? AC connector.
YES NO Check AT 12V line and motor voltage
selector circuit. (Q955~Q956). Is the supply voltage of 12V feed to pin(5) of AC connector? YES Replace capstan motor.
VC-H992U VC-H992U(A)
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