Service manual

TROUBLESHOOTING GUIDE 2
SM 4-49 G130/G131
Subject Symptom Cause Action
Toner blasting (2)-4 Black toner may blast on the
2nd side of paper under the
low temperature at color print
mode.
Black toner moves on the paper during
transport to the fusing section, due to
discharge from the toner to the
surrounding guide plates.
Decrease the paper transfer current and paper
attraction roller current in SP data from the default
setting to a recommended value depending on the
mode selected as shown below.
SP2-301-021, -023, -025 ([FC Y/M/C] Low speed):
“9” to “6 ~ 7”
SP2-301-022, -024, -026 ([FC Y/M/C] Middle
speed): “12” to “9 ~ 10” (G130)
"16" to "12 ~ 13" (G131)
SP2-801-010 ([FC] Low speed): “5” to “8”
SP2-801-011 ([FC] Middle speed):
“8” to “12” (G130)
"10" to "15" (G131)
(If you want to improve this only at 600 dpi print
mode, change the only values with SP2-301-022,
-024, -026 and SP2-801-011.)
NOTE: If the toner limit is lowered too much, it
may cause the density of shadow areas to
be not smooth.
Symptoms related to color
Color Shift Color shift level is out of the
adjustment standard.
The adjustment standard on this product
is “maximum 150 µm”.
The color shift level may change
depending on a type of paper used.
Check the level of the color shifts reported from
user and follow the troubleshooting procedure
described in section 4- if necessary.
Color missing Color(s) is missing on the
outputs.
The position of 3rd mirror moves due to
the rough transportation of service part;
and then, becomes out of position.
Flat cable(s) is not correctly connected
to the BCU board.
• When replacing the laser optic housing unit
due to any reason, make a color demo page in
the UP mode. If color(s) is missing, open the
unit and reposition the mirror(s).
• Reconnect the flat cable(s) firmly.