Oki B4500 Series, Maintenance Manual, Page: 70 / 171

43502101TH Rev.1
70 /
Oki Data CONFIDENTIAL
1
Images are light or blurred entirely.
• Is toner low (is the TONER LOW message displayed)?
• Yes Supply toner.
• No Is paper of the specified grade being used?
• No Use paper of the specified grade.
• Yes Is the lens surface of the LED head dirty?
• Yes Clean the lens.
• No Is the LED head being installed properly (check the
HEAD connector of the main control board and PC
connector on the LED head for proper connection)?
• No Install the LED head properly.
• Yes Is the contact plate of the transfer roller in contact with the
contact assembly of the high voltage/sensor board properly
(see Figure 5-5)?
• No Adjust the contact plate of the transfer roller to make a proper contact with the high
voltage/sensor board and shaft of the transfer roller.
• Yes Are the contact of the developing roller and the contact of the toner supply roller of the image
drum cartrige in contact with the contact assembly properly (see Figure 5-4
A
and
B
)?
• No Adjust the contacts of the developing and toner supply roller to make a proper contact
with the contact assembly.
• Yes Replace the transfer roller.
• Has the problem been solved?
• Yes End
• No Replace the image drum cartridge.
• Has the problem been solved?
• Yes End
Note: After replacing the image drum cartridge, reset the drum counter (see User's
Manual).
• No Is the tension between the back-up roller (7.52kg) and the surface of back-up roller normal?
• No Replace the back-up roller or bias spring.
• Yes Replace the main control board or high voltage/sensor board.
PC connector
LED head cable
HEAD Main control board
LED head