Canon LBP-2000 Service Manual page 164

Laser beam printer
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CHAPTER 4
2-10. White spots
<Possible Causes>
1. The cartridge is running out of toner.
Action: Remove the cartridge from the Printer, and shake it as instructed in Chapter 1; then,
fit it back into the machine. If the problem is not corrected, replace the cartridge.
2. The transfer charging roller is soiled or deformed.
Action: Replace the transfer charging roller.
3. The contact of the toner level sensor and the contact of the cartridge are poor.
Action: If dirt is found, clean the contact. If the problem is not corrected after cleaning, or
deformation or damage is found, replace the faulty part.
4. The photosensitive drum, developing cylinder, or toner level sensor is faulty.
Action: Replace the cartridge.
5. The DC controller PCB is faulty.
Action: Replace the DC controller PCB.
2-11. White vertical lines
<Possible Causes>
1. The cartridge is running out of toner.
Action: Remove the cartridge from the Printer, and shake it as instructed in Chapter 1; then,
fit it back into the Printer. If the problem is not corrected, replace the cartridge.
2. There is a scratch in the peripheral direction of the photosensitive drum.
Action: Replace the cartridge.
3. The developing cylinder is faulty.
Action: Remove the cause of the scratch, and replace the cartridge.
4. The laser outlet of the Printer or the laser inlet of the cartridge is coated with foreign matter.
Action: Remove the foreign matter.
5. There is a scratch on the fixing roller.
Action: Remove the cause of the scratch, and replace the fixing assembly.
6. The mirror inside the laser/scanner unit is soiled.
Action: Replace the laser/scanner unit.
2-12. White horizontal lines
<Possible Causes>
1. There is a horizontal scratch across the photosensitive drum.
Action: Replace the cartridge.
2. There is a scratch on the fixing roller.
Action: Remove the cause of the scratch, and replace the fixing assembly.
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