Service manual

41
VC-A410U
VC-H810U
FLOW CHART NO.9
The cassette tape fails to eject.
Does the capstan motor start when the EJECT button is pressed?
See FLOW CHART NO.12.
Does the take-up reel disk turn when the capstan motor is running?
Check reel disk and reel drive unit.
Are pulses applied at pin(2) of IC701 when the take-up reel disk is turning?
Check take-up reel sensor and all the way up thru to IC701.
Is a "H"(about 1.7V) level applied at pin(12) of IC706 when a reel pules has been inputted?
Check pin(90) of IC701.
Is the voltage about 10V sent out of pin(15) of IC706?
Check IC706.
Is the specified voltage applied at the loading motor terminal?
Check between IC706 and all the way up thru to the loading motor.
Does the loading motor run? Replace loading motor.
Replace cassette cam, gear, etc.
YES YES YES
YES YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
YES YES YES
NO
NO
NO
FLOW CHART NO.10
No power is turned on.
Does power control(H) signal at pin(4) of IC701 change from "L" to "H" level?
Check IC701.
Does the base of Q951 change from about 5.0V to 4.5V?
Check IC701 and all the way up thru to Q951.
Is 5V sent out of the collector of Q951?
Check Q951 and the AT 5V line.
Check peripheral circuits for poor soldering.
FLOW CHART NO.11
The capstan motor fails to run.
Is the voltage more than about 2.6V DC given out of pin(29) of IC701.
Check IC701.
NO NO NO NO NO
YES YES YES YES
YES
Is the supply voltage of 5V feed to pin(8) of AC connector?
Check PC 5V line.
Is the voltage more than 2.6V DC sent in pin(4) of AC connector?
Check between the AC connector and all the way up thru to pin(29) of IC701.
Is the voltage at pin(3) of AC connector 1.6~2.7V?
Check between the pin(92) of IC701 and all the way up thru to pin(3) of AC connector.
Is the supply voltage of 12V feed to pin(5) of AC connector?
Check AT 12V line and motor voltage selector circuit.
Replace capstan motor.