Ricoh MP 7503SP Field Service Manual page 1346

7. Troubleshooting
SC700-04 D
1344
The pick-up motor is operating but the status of the pickup HP sensor does not
change.
• Normally, the rotation of the pick-up motor lowers the pickup roller onto
the surface of the original on top of the raised stack to separate it and
feed it.
• The pickup roller HP sensor detects when the pickup roller is raised and
lowered, but if there is no output from this sensor, the ADF signals the
main machine that a problem has occurred with the original pickup
operation.
• At the second occurrence the ADF signals a jam.
• No signal from the pickup HP sensor because sensor harness, connector
loose, broken, defective.
• Pick-up HP sensor defective
• Pick-up motor harness, connector, is loose, broken, defective.
• Pick-up motor defective.
• ADF main defective
• Inspect the pick-up HP sensor harness, connector for damage and
replace.
• Inspect pick-up motor sensor harness, connector for damage and
replace.
• Inspect ADF main board harnesses, connectors.
• Replace pick-up HP sensor.
• Replace pick-up motor.
• Replace ADF main board.
ADF feed motor error
The machine detected an error signal during operation of the feed motor.
• A problem is detected when an error is detected in register of the feed
motor encoder, in encoder channel A (B), or when the overload signal is
detected.
• However, at the second occurrence the ADF signals a jam.
• A problem occurs in the encoder channel when there is no change in the
encoder pulse even after a drive command is sent.
• An overload error occurs when the PWM duty continues high after the
prescribed has elapsed.