Ricoh Aficio BP20N, Service Manual

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PRINTOUT PROBLEMS
SM 4-11 G144/G145
Trouble-
shooting
4.6 PRINTOUT PROBLEMS
4.6.1 INCORRECT PRINT POSITION
Description: The print job starts even though the paper is not in the correct feed
position.
Cause Solution
Defective feed sensor actuator Replace the defective actuator
4.6.2 VERTICAL BLACK LINE AND BAND
Description: Straight, thin, or dark-black vertical lines are visible on the output
print.
Cause Solution
1. Damaged developer roller, or defective
doctor/cleaning blade in the toner
cartridge.
2. Charge roller surface is scratched.
3. Damage to the surface of the transfer
roller.
1. Replace the toner cartridge and test again.
2. Replace the toner cartridge and test again.
3. Replace the transfer roller and test again.
4.6.3 VERTICAL WHITE LINE
Description: White vertical lines are visible on the output print.
Cause Solution
1. Window or internal lenses of LSU mirror
are contaminated.
2. Particles inside the toner cartridge or low
toner.
3. Particles, contamination, or burr on the
edge of the toner cartridge window.
4. Fusing unit is defective if voids periodically
show on the top of black images.
5. OPC drum is contaminated.
6. Depression or deformation on the surface
of the transfer roller.
1. Clean the LSU window with isopropyl
alcohol. Replace the LSU if there are
unwanted particles inside the unit.
2. Replace the toner cartridge.
3. Clean the exposure window.
4. Check the ribs of the fusing unit and
remove any particles found.
5. Replace the toner cartridge.
6. Replace the transfer roller.