Service manual

TROUBLESHOOTING GUIDE 2
G130/G131 4-50 SM
Subject Symptom Cause Action
Symptoms related to color
Image density change
(1)
When the machine is tuned
on in the morning (having
been unused for a while), the
ID of the initial outputs may
be relatively low or high, in
which case the machine
needs to compensate by
raising or lowering the ID
during machine operation.
When the machine is off, the
environmental conditions can begin to
affect the machine’s development
capability. When the main switch is
tuned on, the machine starts a process
control self-check and adjusts the
development parameters to achieve the
proper development potential gap
without adjusting the toner
concentration. Over the course of the
print operation, the ID will then get closer
and closer to the target level.
If this is often pointed out by users who are very
particular about image density, turn on Auto TD
Adjustment (SP3-125-003) as a solution.
NOTE: It takes about 5 minutes to complete the
self-check.
Image density change
(2)
Image density is too low or
high.
If the machine has never been turned off
and Energy Saver 2 (Auto Off mode) is
disabled, the machine has never
performed the initial process control self-
check, causing the image density to
become low or high.
Change the settings of the following SP modes:
SP3-906-003 Non-use Time 1
0 (Default) to 999
SP3-906-004 Non-use Time 2
0 to 2550 (Default: 480)
• If Energy Saver 1 is activated (Default: Off), the
non-use time process control self-check will not
function. Therefore, make sure that Energy
Saver 1 is Off (UP mode).
• With the above setting, the self-check
automatically starts after 500 prints and after no
prints have been made for 480 minutes (8
hours). Based on the average daily printing
volume of 500 prints, self-check would be
performed first thing every morning. These
settings are suitable for machines, which are
used during the day and then kept On in Ready
status throughout the night. Therefore, this SP
mode should be set based on the particular way
the customer uses the printer.