Canon LBP-2000, Service Manual

Page: 163 / 222

CHAPTER 4
4 - 12
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.
A c t i o n : 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.
A c t i o n : 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.
A c t i o n : Replace the cartridge.
4 . The DC controller PCB is faulty.
A c t i o n : 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.
A c t i o n : 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.
A c t i o n : 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.
A c t i o n : 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.
A c t i o n : 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.
A c t i o n : Replace the DC controller PCB.