Oki B4100 Maintenance Manual page 60

2
Dark background density
• Has the image drum been exposed to external light?
• Yes
• No Perform the cleaning page function (see Section 4.2.2).
• Has the problem been solved?
• Yes
• No Is the heat roller of the fusing unit dirty?
• Yes
• No Is the contact of the cleaning roller of the image drum cartridge in contact with the contact
assembly properly (see Figure 5-4
• No
• Yes Replace the image drum cartridge.
• Has the problem been solved?
• Yes
• No Replace the main control board or high voltage/sensor board.
3 Blank paper is output.
• Is the LED head being connected properly (check the HEAD connector on the main control board and
PC connector on the LED head)?
• No Connect the LED head properly or replace the head cable.
• Yes Is the contact of the image drum cartrige in proper contact with the ground contact properly (see
Figure 5-4
• No Adjust the ground contact (Drum) of the contact assembly.
• Yes Replace the LED head.
• Has the problem been solved?
• Yes End
• No Replace the main control board or high voltage/sensor board.
42640901TH Rev.1
Install the image drum in the printer and wait about 30 minutes.
End
Clean the heat roller.
Adjust the contact of the cleaning roller to make a proper contact with the contact
assembly.
End
Note: After replacing the image drum cartridge, reset the drum counter (see User's
Manual).
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Oki Data CONFIDENTIAL
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