Canon LBP-1210 Service Manual page 173

1) The toner cartridge is running out of toner.
Action: Remove the cartridge from the printer. Rock the cartridge in the manner described
in Chapter 1 on Page 1-9, and then install it back to the printer. If the problem still
remains, replace the cartridge.
2) Dirty or deformed transfer charging roller
Action: Replace the roller.
3) The photosensitive drum or developing cylinder is defective.
Action: Replace the cartridge.
4) Defective engine controller PCB
Action: Replace the engine controller PCB.
II-11. White vertical lines
<Possible causes>
1) The toner cartridge is running out of toner.
Action: Remove the cartridge from the printer. Rock the cartridge in the manner described
in Chapter 1 on Page 1-9, and then install it back in the printer. If the problem per-
sists, replace the cartridge.
2) Circumferential scars on the photosensitive drum
Action: Replace the cartridge.
3) Defective developing cylinder
Action: Replace the cartridge.
4) Foreign materials are deposited on the laser outlet of the printer or the laser inlet of the car-
tridge.
Action: Remove the foreign materials.
5) The face-down or face-up delivery roller is dirty.
Action: Clean the dirty part. If dirt cannot be removed, replace the dirty roller.
6) Dirt or foreign materials on the fixing unit entrance guide.
Action: Clean the fixing unit entrance guide.
7) Scars or foreign materials on the fixing film
Action: Replace the fixing film unit.
8) The mirror in the laser/scanner unit is dirty.
Action: Replace the laser/scanner unit.
II-12. White horizontal lines
<Possible causes>
1) There is a horizontal scar(s) on the photosensitive drum.
Action: Replace the cartridge.
CHAPTER 4
4 - 9