Sharp vc-ga56z Service Manual page 39

FLOW CHART NO.10
The cassette tape fails to eject.
Does the capstan motor start when
NO
the EJECT button is pressed?
YES
NO
Does the take-up reel disk turn when
the capstan motor is running?
YES
NO
Are pulses applied at pin(2) of IC701
when the take-up reel disk is turning?
YES
Is a "H"(about 4.7V) level applied at
NO
pin(12) of IC706 when a reel pules
has been inputted?
YES
NO
Is the voltage about 10V sent out of
pin(15) of IC706?
YES
NO
Is the specified voltage applied at the
loading motor terminal?
YES
NO
Dose the loading motor run?
YES
Replace cassette cam, gear, etc.
See FLOW CHART NO.12.
Check reel disk and reel drive unit.
Check take-up reel sensor and all the
way up thru to IC701.
Check pin(90) of IC701.
Check IC706.
Check between IC706 and all the
way up thru to the loading motor.
Replace loading motor.
FLOW CHART NO.11
No power is turned on.
NO
Does power control(H) signal at
pin(4) of IC701 change from "L" to
"H" level?
YES
NO
Does the base of Q951 change from
about 5.0V to 4.5V?
YES
NO
Is 5V sent out of the collector of
Q951?
YES
Check peripheral circuits for poor
soldering.
FLOW CHART NO.12
The capstan motor fails to run.
Is the voltage more than about 2.6V
NO
DC given out of pin(29) of IC701.
YES
NO
Is the supply voltage of 5V feed to
pin(8) of AC connector?
YES
Is the voltage more than 2.6V DC
NO
sent in pin(4) of AC connector?
YES
Is the voltage at pin(3) of AC NO
connector 1.6~2.7V?
YES
NO
Is the supply voltage of 12V feed to
pin(5) of AC connector?
YES
Check IC701.
Check IC701 and all the way up thru
to Q951.
Check Q951 and the AT 5V line.
Check IC701.
Check PC 5V line.
Check between the AC connector
and all the way up thru to pin(29)
of IC701.
Check between the pin(92) of IC701
and all the way up thru to pin(3) of
AC connector.
Check AT 12V line and motor voltage
selector circuit.
Replace capstan motor.