Oki ES5112dn Maintenance Manual page 39

Pale printing or the whole printing is faded.
• Does the printer lack toner? (Is the message of Toner Low displayed?)
• Yes Supply the toner.
• No Is specified paper used.
• No Use specified paper.
• Yes Is the lens of the LED head dirty?
• Yes Clean the lens.
• No Is the LED head appropriately installed? (Check that the HEAD0
connector of the main board and the PC connector of the LED
head are appropriately connected.)
• No Install the LED head appropriately.
• Yes Does the contact plate of the transfer roller contact the TR
terminal of the high-voltage power supply unit properly? (See
Figure 2-4 , Section 6.2(6))
• No Adjust the contact plate of the transfer roller so that it
contacts the TR terminal of the high-voltage power supply
unit and the transfer roller shaft well.
• Yes Are the contact of the developing roller and toner supply roller of
the image drum cartridge appropriately connected to the contact
assembly? (See Figure 2-3
• No Adjust so that the contacts of the developing roller and
toner supply roller are connected to the contact assembly.
• Yes Replace the transfer roller.
and )
• Has the trouble been solved?
• Yes Completed
• No Replace the image drum cartridge.
• Has the trouble been solved?
• Yes Completed
• No Is the surface elasticity of the back-up roller normal?
• No Replace the fuser Assy.
• Yes Replace the main board or high-voltage power supply unit.
LED head
2. Procedures for Repairing
LED head cable
PC connector
Main board
2-23