Oki 4M - Manual (Page 86)

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2 Dark background density
• Has the OPC drum being exposed to external light?
• Yes Set the OPC drum in the OKIPAGE 4w Plus/4m and wait for about 30 min-
utes.
• No Is the heat roller of the heat assy dirty?
• Yes Clean the heat roller.
• No Is the terminal of the EP unit in correct contact with the contact plate? (See Figure
6-4
D and Figure 6-5 D .)
• No Contact the terminal correctly.
• 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.
3 A blank paper is output.
• Is the LED head connected correctly. (Check the CN6 connector of the main control board.)
• No Connect the LED head correctly.
• Yes Is the terminal of the EP unit in correct contact with the contact plate? (See Figure
6-5
E .)
• No Contact the terminal 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.)
• No Replace the main control board or high-voltage power supply board.