Canon LBP-2000 Service Manual page 163

CHAPTER 4
2 - 4 . Solid black
<Possible Causes>
1 . The contact of the leaf spring for the primary bias and the contact of the cartridge are faulty.
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 parts.
2 . The contact for the primary bias on the DC controller and the contact of the cartridge are poor.
Action: If dirt is found, clean the contact. If the problem cannot be corrected after cleaning, or
deformation or damage is found, replace the faulty part.
3 . The primary charging roller is faulty.
Action: Replace the cartridge.
4 . The DC controller PCB is faulty.
Action: Replace the DC controller PCB.
2 - 5 . D o t s
<Possible Causes>
1 . The contact of the leaf spring for the static eliminating brush and the contact of the leaf spring
for the static eliminating brush are faulty.
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.
2 . The transfer charging roller is deformed/worn.
Action: Replace the transfer charging roller.
3 . The contact for the leaf spring for the transfer charging roller and the contact of the transfer
charging roller shaft are poor.
Action: If dirt is found, clean the contact. If the problem is not corrected after cleaning, or
deformation or image is found, replace the faulty part.
4 . The contact for the transfer charging roller on the DC controller PCB and the contact of the
leaf spring for the transfer charging roller are poor.
Action: If dirt is found, clean the contact. If the problem cannot be corrected after cleaning, or
deformation or damage is found, replace the faulty part.
5 . The DC controller PCB is faulty.
Action: Replace the DC controller PCB.
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