Oki C9800 Series, Service & Troubleshooting Manual

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C, M, Y, K Imaging Drum Unit Failure
Error Codes that Apply
340 Yellow Drum Unit Failure 342 Cyan Drum Unit Failure
341 Magenta Drum Unit Failure 343 Black Drum Unit Failure
1.
Reseat the indicated Image Drum Unit
2. Cycle the printer's power.
3. If the problem persists follow the procedure below.
1. C, M, Y, K Imaging Drum Unit
2. C, M, Y, K Unit Motor
3. Imaging Drum Unit Sensor Board
4. Imaging Drum Unit Up/Down Mechanism
4. Engine Control Board
Steps Action Taken Yes No
1
Check the following for evidence of
fault or damage:
Imaging Unit
Imaging Unit Drive Gears
Imaging Unit Sensor Board
Imaging Unit Lift Up/Down Mechanism
Is there any damage?
Replace any damaged
parts. Go to Step 2.
2
Test the Drum Phase Sensor.
Run the Scan Switch test for the
indicated Imaging Unit.
Does the sensor function correctly?
Go to Step 5 Go to Step 3.
3
Use the Scan switch Test to check
the Imaging Unit Phase signal:
C-Drum Phase Sensor
M-Drum Phase Sensor
Y-Drum Phase Sensor
K-Drum Phase Sensor
Does the Drum Phase signal change
when the sensor is blocked?
Go to Step 4.
Replace the Imaging
Unit Sensor Board
4
Check the harness continuity.
Disconnect the Harness from the
Imaging Unit Sensor Board and from
the Engine Control Board.
Is the harness conductive?
Replace the Engine
Control Board
Replace the harness.
Initial Troubleshooting Actions to Take
Parts of the Printer that Apply
Troubleshooting Procedure