Sharp VC-H961U - Page 40

40
VC-A560U(A)/A560U/A560U(B)
VC-H960U/H960U(B)/H961U
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.11.
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.
Does pin(10) of P701 go from 2.5V to 0.8V when veel pules has beer input.
Check pin(72) of IC701.
Does the loading motor run? Replace loading motor.
Replace cassette cam, gear, etc.
YES YES YES
YES
YES
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(76) 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 emitter 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(24) of IC701.
Check IC701.
NO NO NO NO NO
YES YES YES YES
YES
Is the supply voltage of 5V feed to pin(3) of P701.
Check PC 5V line.
Is the voltage more than 2.6V DC sent in pin(9) of P701.
Check between pin(9) of P701 and all the way up thru to pin(24) of IC701.
Is the voltage at pin(5) of P701 3.5V?
Check between the pin(71) of IC701 and all the way up thru to pin(5) of P701.
Is the supply voltage of 12V feed to pin(2) of P701.
Check motor-VCC line and motor voltage selector circuit.
Replace capstan motor.