Laser Scanner Unit; Drum Unit; Developing Unit; Reader Controller Pcb - Canon imageRUNNER ADVANCE 4551i Service Manual

Laser Scanner Unit

How to Replace the Parts:
■ Actions after Replacement
When replacing the laser unit, enter the values recorded on the label affixed to the laser unit to be replaced for the following in
the service mode:
Input example
• Adjust of write start position of laser
COPIER > ADJUST > LASER > PVE-OFST > 136
• Difference in magnification between the lasers (K)
COPIER > ADJUST > LASER > LDADJ1-K > -10
COPIER > ADJUST > LASER > LDADJ2-K > 0)
COPIER > ADJUST > LASER > LDADJ3-K > 147
• Difference in the phase between the lasers (K)
COPIER > ADJUST > LASER > LDADJ4-K > 93
COPIER > ADJUST > LASER > LDADJ5-K > 16
COPIER > ADJUST > LASER > LDADJ6-K > 117

Drum Unit

How to Replace the Parts:
■ Actions after Parts Replacement
1. Execute auto gradation adjustment.
• Settings/Registration > Adjustment/Maintenance > Adjust Image Quality > Auto Adjust Gradation

Developing Unit

How to Replace the Parts:
■ Actions after Parts Replacement
1. Execute all series of operation for supplying toner to the Developing Assembly/Toner Supply area. After counting
down from 600 seconds, it is stopped automatically.
• COPIER > FUNCTION > INSTALL > TONER-S

Reader Controller PCB

How to Replace the Parts:"Removing the Reader Controller PCB" on page 188
■ Actions before Parts Replacement
1. Output the latest service mode setting values.
• Service Mode > COPIER > FUNCTION > MISC-P > P-PRINT
"Removing the Laser Scanner Unit" on page 250
-10 0
"Removing the Drum Unit" on page 259
"Removing the Developing Assembly" on page 252
147 136 93 16
328
117
5. Adjustment