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(25) of IC701?
Check IC701.
NO
NO
YES
Is the voltage more than about 2.6V
DC given out of pin(12) (sankyo IC)
of AC connector or pin(32) (kuma-
gaya IC) of IC706?
Check line between pin(25) of IC701
and pin(12) (sankyo IC) of AC
connector or pin(32) (kumagaya IC)
of IC706.
NO
YES
YES
Is the supply voltage of 12V fed to
pin(8) (sankyo IC) of AC connector
or pin(20) (kumagaya IC) of IC706?
Replace drum motor.
Check M 12V line.
FLOW CHART NO.14 DRUM MOTOR TROUBLESHOOTING(2)
The drum motor runs only for a few seconds.
Replace IC706.
Check peripheral circuit of pins (22), (23)
and (24) of IC706.
Is drum PG signal given out from the
pin (33) of IC706?
Is drum PG signal fed to pin(47) of
IC701?
Check line between pin(33) of IC706
and pin(47) of IC701.
Is head switching pulse sent out from
the pin(18) of IC701?
Check IC701.
Replace IC701.
NO
Check drum motor.
YES
YES
YES
YES
NO
NO
NO
D-FG
D-PG
YES
NO
YES
YES
NO
NO
FLOW CHART NO.15 HEAD SWITCHING PULSE TROUBLESHOOTING.
No head switching pulse.
See FLOW CHART NO.14, 15 (DRUM
MOTOR TROUBLESHOOTING(1), (2))
Is the drum motor rotating?
Is the drum PG signal and drum FG
signal present at pin(47) of IC701?
Replace IC701.
Check line between IC706 and
IC701.
Check peripheral circuit of IC706.
Are the drum PG signal and drum
FG signal present on pins (33), (34)
of IC706?
2.5V
2.5V
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