SHARP VC-H992U(A)
Instrukcja Serwisowa

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)