SHARP VC-A433M
Manual de Servicio

FLOW CHART NO.10 FLOW CHART NO.9

The cassette tape fails to eject. No power is turned on.

See FLOW CHART NO.11.
pin(76) of IC701 change from "L" to

Does the capstan motor start when NO Check IC701. the EJECT button is pressed? "H" level?

NO Does power control(H) signal at

YES YES

NO take-up turn when disk reel drive unit. Does base of Q961 change from NO Check IC701 and all the way up thru YES

the capstan motor is running? about 0V 5.7V? to Q961.

way up thru to IC701.
Q961?
YES

Check take-up reel sensor and all the NO Is 5V sent out the emitter of Are pulses applied at pin(2) of IC701 Check Q961 and the AT 5V line. when the take-up reel disk is turning?

YES

Does pin(10) of P701 go from 2.5V NO to 0.8V when reel pules has been

Check peripheral circuits for poor

Check pin(72) of IC701. soldering.

input.

YES

Does the motor run? Replace loading motor. FLOW CHART NO.11

NO

YES The capstan motor fails to run.

Replace cassette cam, gear, etc.

39
Is the voltage more than about 2.6V NO DC given out pin(24) of IC701. pin(3) of P701.
NO

Check IC701.
YES NO Is the supply voltage of 5V feed to

Check PC 5V line.
YES

Check between pin(9) of P701 and Is the voltage more than 2.6V DC all the way up thru to pin(24) of sent in pin(9) of P701. IC701.
YES

Check between the pin(71) of IC701 Is the voltage at pin(5) of P701 NO and all the way up thru to pin(5) of 3.5V? P701.
YES NO Check motor-VCC line and motor

Is the supply voltage of 23V feed to voltage selector circuit. pin(2) of P701. YES

Replace capstan motor.

VC-A433M/H833M