Oki C9800 Series Service & Troubleshooting Manual page 122

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