Sharp VC-GH60SM Serviceanleitung Seite 43

FLOW CHART NO.10 CASSETTE CONTROL TROUBLESHOOTING(2)
A cassette tape is taken in, but ejected at once.
Does the start sensor pulse at pin (87)
NO
of IC701 change from "L" to "H" level
when the cassette tape is loaded?
YES
Does the end sensor pulse at pin (86)
NO
of IC701 change from "L" to "H" level
when the cassette tape is loaded?
YES
Does the master cam mode shifter
NO
operate normally when the cassette
tape is loaded?
YES
Replace IC701.
FLOW CHART NO.11 LOADING MOTOR AND EJECT TROUBLESHOOTING
The cassette tape fails to come out.
Does the capstan motor start when the
NO
EJECT button is pressed?
YES
Does the take-up reel disk turn when the
NO
capstan motor is running?
YES
Is a "H" level applied at pin(10) of P701 NO
when a reel pulse has been inputted?
YES
Check IC on mechanism.
NO
Is the voltage about 10V sent out from
IC on mechanism?
YES
NO
Is the specified voltage applied at the
loading motor terminal?
YES
NO
Does the loading motor run?
YES
Replace cassette cam, gear, etc.
Check line between start sensor and pin
(87) of IC701.
Check line between end sensor and pin
(86) of IC701.
Check line between cam switch and
IC701.
See FLOW CHART NO.12. CAPSTAN
MOTOR TROUBLESHOOTING
Check line between take-up reel
sensor and pin(2) of IC701.
Check line between pin(92) of IC701
and pin(10) of P701.
YES
Is the supply voltage of 12V fed to
pin(8) of P701?
NO
Check M 12V lines.
Check line between IC on mechanism
and loading motor.
Replace loading motor.
FLOW CHART NO.12 CAPSTAN MOTOR TROUBLESHOOTING
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 fed to
pin(3) of P701?
YES
NO
Is the voltage more than 2.6V DC
sent in pin(9) of P701?
YES
NO
Is the voltage of pin(5) of P701 is
1.6~2.7V?
YES
Is the supply voltage of 12V/20V fed
NO
to pin(2) of P701?
YES
Replace capstan motor.
Check IC701.
Check PC 5V line.
Check line between pin(9) of P701
and pin(29) of IC701.
Check line between the pin(91) of
IC701 and pin(5) of P701.
Check MOTOR Vcc line and motor
voltage selector circuit.