Oki 4M - Manual (Page 90)

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8 Vertical white belt/spripe
• Is the lens of the LED head dirty?
• Yes Clean the LED head.
• No Is the contact plate of the transfer roller in correct contact with the high-voltage
power supply board? (See Figure 6-5
E .)
• No Contact the contact plate of the transfer roller correctly.
• Yes Replace the transfer roller.
• Has this error been recovered?
• Yes End
• No Is the LED head installed correctly? (Check the CN6 connector of the main control
board.)
• No Install the LED head correctly.
• Yes Replace the LED head.
• Has this error been recovered?
• Yes End
Caution: Set the LED head drive time when replacing the LED head. (See
Section 4.2.1.)
• Yes Replace the EP unit.
• Has this error been recovered?
• Yes End
Caution: After replacing the EP unit, reset the drum counter. (Refer to
"Replacing the Drum Cartridge" in "User's Manual".)
• No Replace the main control board or high-voltage power supply board.