Read Sharp VC-M315HM (serv.man7) Service Manual online
42
VC-M305HM/LM
VC-M315HM/LM
FLOW CHART NO.13 DRUM MOTOR TROUBLESHOOTING(1)
The drum motor fails to run.
Is the voltage more than about 2.6V
DC given out of pin(30) of IC701?
DC given out of pin(30) of IC701?
Check IC701.
NO
NO
NO
YES
YES
Check PC 5V.
Is the supply voltage of 5V fed to
pin(3) of P701?
pin(3) of P701?
Is the voltage more than about 2.6V
DC given out of pin(12) of P701?
DC given out of pin(12) of P701?
Check line between pin(30) of
IC701 and pin(12) of IP701.
IC701 and pin(12) of IP701.
NO
YES
YES
Is the supply voltage of 12V fed
to pin(8) of P701?
to pin(8) of P701?
Replace drum motor.
Check M 12V line.
FLOW CHART NO.12 CAPSTAN MOTOR TROUBLESHOOTING
The capstan motor fails to run.
Is the voltage more than about 2.6V
DC given out of pin(29) of IC701?
DC given out of pin(29) of IC701?
Check IC701.
NO
NO
NO
NO
NO
YES
YES
YES
YES
Is the supply voltage of 5V fed to
pin(8) of P701?
pin(8) of P701?
Check PC 5V line.
Is the voltage more than 2.6V DC
sent in pin(9) of P701?
sent in pin(9) of P701?
Check line between the P701 and
pin(29) of IC701?
pin(29) of IC701?
Is the voltage of pin(5) of P701
1.6~2.7V?
1.6~2.7V?
Check line between the pin(91) of
IC701 and pin(5) of P701.
IC701 and pin(5) of P701.
Is the supply voltage of 12V/25V fed
to pin(2) of P701?
to pin(2) of P701?
YES
Replace capstan motor.
Check MOTOR Vcc line and motor
voltage selector circuit. (Q992, Q993)
voltage selector circuit. (Q992, Q993)
FLOW CHART NO.14 DRUM MOTOR TROUBLESHOOTING(2)
The drum motor runs only for a few seconds.
Replace IC on mechanism.
Check peripheral circuit of IC on
mechanism.
mechanism.
Is drum PG signal given out from
the pin(11) of P701?
the pin(11) of P701?
Is drum PG signal fed to pin(65)
of IC701?
of IC701?
Check line between pin(11) of
P701 and pin(65) of IC701.
P701 and pin(65) of IC701.
Is head switching pulse sent out
from the pin(23) of IC701?
from the pin(23) of IC701?
Check IC701.
Replace IC701.
NO
Check drum motor.
YES
YES
YES
YES
NO
NO
NO
D. FG-PG
about 5Vp-p
YES
NO
YES
YES
NO
NO
FLOW CHART NO.15 HEAD SWITCHING PULSE TROUBLESHOOTING.
No head switching pulse.
See FLOW CHART NO.13, 14
(DRUM MOTOR
TROUBLESHOOTING(1), (2))
(DRUM MOTOR
TROUBLESHOOTING(1), (2))
Is the drum motor rotating?
Is the drum PG signal and drum
FG signal present on pin(65) of
IC701?
FG signal present on pin(65) of
IC701?
Replace IC701.
Check line between P701 and IC701.
Check peripheral circuit of
IC on mechanism.
IC on mechanism.
Are the drum PG signal and drum
FG signal present on pin(11) of
P701?
FG signal present on pin(11) of
P701?
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