Service manual

TROUBLESHOOTING GUIDE 2
G130/G131 4-46 SM
Subject Symptom Cause Action
Smeared image When making prints of an
original with a solid image
near the trailing, a smeared
image may appear.
The paper’s trailing edge tends to flip up
and come very close to the fusing belt
after it passes the paper transfer unit.
The static electricity built up on the
fusing belt may cause toner to move,
resulting in the smeared image.
This is most noticeable with 600x600dpi
printing.
Please instruct users to select 1800x600 or
1200x1200dpi
.
Crow marks When making duplex prints in
low temperature and humidity
conditions, crow marks may
appear on black images,
especially in halftone areas
on the 2nd side.
A charge is applied to the paper at each
color station in order to attract each
toner onto the paper. Therefore, the
initial toner colors will receive multiple
charging as they pass each station,
which increases the attractive force
between the toner and paper. Since
black is the last toner to be applied, the
attractive force between it and the paper
is lowest. Black toner moves on the
paper during transport to the fusing
section, due to discharge from the toner
to the surrounding guide plates.
Using SP2-301 (Transfer Current), increase the
paper transfer current for black in the mode in
which the problem occurs.
NOTE: White dotted lines may appear on outputs
if the transfer current is increased too
much. Therefore, after adjusting the
transfer current, it is necessary to check
the results by making a solid or halftone
image in duplex mode.