SHARP XA-920
Manual de Servicio

XA-905 XA-920

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

NO Does the take-up turn when 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.

YES

way up thru to IC701.
YES

Check take-up reel sensor and all the Is 5V sent out the collector of NO Are pulses applied at pin(2) of IC701 Check Q951 and the AT 5V line. Q951? when the take-up reel disk is turning?

YES

NO

Check pin(90) of IC701. soldering. pin(12) of IC706 when a reel pules

Check peripheral circuits for poor Is a "H"(about 4.7V) level applied at

has been inputted?

YES

Is the voltage about 10V sent out of NO pin(15) of IC706? Check IC706. FLOW CHART NO.12

YES The capstan motor fails to run.

NO Is specified voltage applied at Check between IC706 and all the

40
DC given out pin(29) of IC701.
YES

motor terminal? way up thru to the loading motor.

YES Is the voltage more than about 2.6V NO

Check IC701.

Does the motor run? Replace loading motor.

NO

YES Is the supply voltage of 5V feed to NO

pin(8) of AC connector?
YES NO sent in pin(4) of AC connector? and all the way up thru to pin(29) YES

Check PC 5V line.

Replace cassette cam, gear, etc.

Check between the AC connector Is the voltage more than 2.6V DC 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 about 3.5V? AC connector.
YES NO

Is the supply voltage of 23V feed to pin(5) of AC connector? YES

Check AT 23V line. Replace capstan motor.