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NO.14 DRUM MOTOR TROUBLESHOOTING(1) FLOW CHART NO.16 HEAD SWITCHING PULSE TROUBLESHOOTING.
The drum motor fails to run. No head switching pulse.
Is the voltage more than about 2.6V DC fed NO See FLOW CHART NO.14, 15 NO Is the drum motor rotating?
(DRUM MOTOR
NO PG and drum FG signal Is the voltage about 5V fed to pin(7) of
Check IC701.
YES
to pin(31) of IC701? TROUBLESHOOTING(1), (2))
Check PC 5V line. YES properlypresent on pins(66) and (65) of Replace IC701. SC701 connector? IC701, respectively?
NO NO
YES
Is Check line between pin(7) of SC701 the voltage more than about 2.6V DC fed D-FG connector and pin(33) of IC701. to pin(1) of SC701 connector?
YES NO Is the voltage 12V fed to pin(4) of AD
Check PC 12V line. connector?
D-PG
YES
YES Are there drum PG FG signals at pins Check line between pins(3) and (5) of SC701
Replace drum motor.
(3) (5) SC701 connector, respectively? connector pins(66) and (65) of IC701.
NO
Check line between SC701 connector and FLOW CHART NO.15 DRUM MOTOR TROUBLESHOOTING(2) drum motor.
47
Check drum motor.
NO Check line between pin(5) of SC701 NO Is drum FG signal fed to pin(3) of SC701 NO Check line between pin(3) of SC701
The drum motor runs only for a few seconds.
Is drum PG signal fed to pin(5) of SC701 NO connector?
YES
Is drum PG signal fed to pin(66) of IC701? connector and pin(66) of IC701.
YES
Check drum motor. connector?
YES
Is drum FG signal fed to pin(65) of IC701? connector and pin(65) of IC701.
YES
Is head switching pulse sent out from the pin(23) of IC701?
