Oki C9850 Maintenance Manual page 195

-1 Paper Supply Jam (1st Tray)
• Immediately after turning ON the power, does the paper jam occur?
• YES
• NO
• YES
• YES
• NO Immediately after intaking the paper, does a paper jam occur?
• YES
• NO
• NO Is the Main Feed Motor operating?
• NO Is the main feed motor resistance the rated value of approx. 3.4Ω?
NO
• YES Is 20V or more output to the DC0 connector pin of the Motor Driver PCB
(S2P)?
NO
• YES After checking the gear engagement and cable connection, replace the Motor Driver
PCB (S2M PWB).
43627911TH Rev. 3
Is there a jam in the IN1 Sensor or 1st Hopping Sensor?
YES Remove the paper jam.
(A)
Does the sensor lever Sensor (IN1 Sensor, 1st Hopping Sensor) operate
normally?
NO Replace the defective sensor lever.
Does the sensor (IN1 Sensor, 1st Hopping Sensor) operate normally?
(Check the sensor output using the switch scan test in the self-diagnosis
mode.)
NO Check the signal cable connection, then replace the Sensor PCB
(S2C PWB).
After checking the signal cable connection, replace the Motor Driver PCB
(S2P).
Did the paper reach the IN1 Sensor or 1st Hopping Sensor?
Yes Go to (A).
Replace the paper separation frame Assy of the Feed Roller or Paper
Cassette.
YES Replace the Feed Roller or Retard Roller.
Replace the Main Feed Motor.
Replace the low voltage power unit.
Oki Data CONFIDENTIAL
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