Print Troubleshooting - Oki MB461 Maintenance Manual

Oki Data CONFIDENTIAL

8.5.6 Print Troubleshooting

The troubleshooting procedure of abnormal printing is described as follows. The typical
abnormal printing is shown in the following Figure 7-1.
Trouble
Pale printing or the whole printing is faded. (Fig.7-1
The white section is dirty. (Fig.7-1
White paper is outputted (Fig. 7-1
Vertical black belt/ Black line (Fig. 7-1
Periodic failure (Fig. 7-1 )
A part of printing is extracted
Inefficient fusing (when touching the printed sheet, printed
characters or image is faded or come off.)
Vertical white belt/ White line (Fig. 7-1
Pale printing or
the whole printing
is faded
Vertical black
belt/ Black line
44871001TH Rev.6
Flowchart number
)
)
)
)
)
The white White paper
section is dirty
Periodic failure Vertical white
belt/ White line
Figure 7-1
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 HEAD 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 7-3 , Section
9.2 (2))
• 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 7-2
• 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.
• 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.
8. TROUBLESHOOTING PROCEDURES
LED head
LED head cable
PC connector
Main board
and )
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