Sharp VC-GH60SM Serviceanleitung Seite 44

FLOW CHART NO.13 TIMER TROUBLESHOOTING
The LCD display fails to light up.
Is the supply voltage of 5V fed to
NO
pin(37) of IC8001?
YES
Is the supply voltage of 3.4V, 1.7V
NO
feed to pin(38) and pin(39) of IC8001?
YES
Is it possible to confirm signals
NO
LCD RESET, LCD CS, LCD CLOCK
and LCD DATA on the pins(36),
(42), (43) and (44) of IC8001?
YES
NO
Is the OSC signal at pin(41) of
IC8001 present?
YES
Are the segment signals
supplied to the LCD display
(LC8001) fromthe driver IC
NO
(IC8001)?
YES
Check that the LCD display is
free from damages such as
crack.
FLOW CHART NO.14 DRUM MOTOR TROUBLESHOOTING(1)
The drum motor fails to run.
Is the voltage more than about 2.6V
NO
DC given out of pin(30) of IC701?
YES
NO
Is the voltage more than about 2.6V
DC given out of pin(12) of P701?
YES
NO
Is the supply voltage of 12V fed to
pin(8) of P701?
YES
Replace drum motor.
Check AT 5V line.
Check pin(38), (39) of IC8001
and peripheral circuits.
Check peripheral circuit of pin(41)
of IC8001.
Replace IC8001.
Check IC701.
Check line between pin(30) of IC701
and pin(12) of P701.
Check M 12V line.
FLOW CHART NO.15 DRUM MOTOR TROUBLESHOOTING(2)
The drum motor runs only for a few seconds.
Is drum PG signal given out from the
NO
pin (11) of P701?
YES
NO
Is drum PG signal fed to pin(65) of
IC701?
YES
NO
Is head switching pulse sent out from
the pin(23) of IC701?
YES
Replace IC701.
FLOW CHART NO.16 HEAD SWITCHING PULSE TROUBLESHOOTING.
No head switching pulse.
NO
Is the drum motor rotating?
YES
Is the drum PG signal and drum FG
YES
signal present at pin(65) of IC701?
NO
D-PG
2.5V
D-FG
2.5V
YES
Are the drum PG signal and drum FG
signal present on pin(11) of P701?
NO
Check peripheral circuit of IC on
mechanism.
Replace IC on mechanism.
NO
Check peripheral circuit of IC on
mechanism
YES
Check drum motor.
Check line between pin(11) of P701
and pin(65) of IC701.
Check IC701.
See FLOW CHART NO.14, 15 (DRUM
MOTOR TROUBLESHOOTING(1), (2))
Replace IC701.
Check line between P701 and
IC701.