Canon iR5000i Service Manual page 641

4.1.13 E061
Status check
1) Select COPIER>DISPLAY>DPOT in service mode.
If the difference between VDM and VDT is less than 6V, go to step 2). If
the difference is 6V or greater, go to step 4).
Laser shutter
2) Remove the laser scanner unit. Is the laser shutter mechanism nor-
No:
Laser unit
3) Replace the laser unit. Remedied?
YES: End
NO:
Preconditioning LED
4) Display COPIER>DISPLAY>DPOT in service mode.
NO:
Potential sensor
5) Replace the potential sensor. Remedied?
No:
Primary corona assembly
6) Replace the primary corona assembly. Remedied?
YES: End
NO:
7) Replace the DC controller. Remedied?
YES: End
NO:
COPYRIGHT © 2001 CANON INC.
CHAPTER 4 TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
mal?
Correct the laser shutter mechanism.
Check the wiring. If the wiring is normal, replace the DC control-
ler PCB.
Is PLMT 1V?
Display COPIER>FUNCTION>MISC-P>PRE-EXP in service
mode.
Check if the preconditioning LED lights. If the LED does not
light, replace the LED.
Adjust or replace the potential sensor unit.
Replace the DC controller.
Upgrade the DC controller DIMM ROM to Ver. 4.04 or higher.
2000 2000 2000 2000 CANON iR5000i/iR6000i REV.0 JUNE 2001
4-25 T