Ricoh B173 Service Documentation page 112

Fault
White or Black
Spots
B173
Signs
• Light or dark 1. If light or dark
black dots on
the image
occur
periodically.
• White spots
occur in the
• 37.7mm interval :
image
periodically.
• 75.5mm interval :
2. If white spots occur in
3. If a black and white or
TONER CARTRIDGE (AIO) SERVICE
Cause & Check
periodical black dots
occur, this is because
the developer rollers
are contaminated
with foreign
substance or paper
particles.
Charged roller
OPC cycle
a black image at
intervals of 75 mm, or
black spots occur
elsewhere, the OPC
drum is damaged or
foreign substance is
stuck to the surface.
graphic image is
partially broken at
irregular intervals, the
transfer roller's life
has been expired or
the transfer voltage is
abnormal.
4-46
Solution
1. In case of 1 –
Run OPC Cleaning
Mode Print 4-5 times
repeatedly to remove.
Especially check foreign
substance on the OPC
surface, then remove
them with a clean gauze
moistened with IPA
(Isopropyl Alcohol) not
to damage OPC if
necessary.
Never use usual
alcohol.
2. In case of 2 -
If they do not
disappeared by
running the OPC
Cleaning Mode Print
4-5 times.
• at intervals of 37.7
mm – Replace the
AIO.
• at intervals of 75 mm
– Remove foreign
substance.
• Broken image -
Replace the AIO.
3. In case of 3 -
Exchange the
transfer roller
because the life of
the transfer roller in
use has been
expired. (Check the
transfer voltage and
readjust if different.)
SM