Service manual

TROUBLESHOOTING GUIDE 30 July, 2001
4-36
Subject Symptom Cause Action
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 500
SP3-906-004 Non-use Time 2
30 (Default) to 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 (SP5-101-3 or 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.
Toner blasting Toner may blast, causing
smeared text characters
and/or lines in 2C or process
black mode (depending on
the PDL setting or type of
paper used.)
An excessive amount of toner is used for
development.
Change the toner limit setting in SP mode.
• If toner blasted images appear for text or lines
in 2C, decrease the setting for Text from 190%
to 150 - 170%.
• If toner blasted images for text and lines
recognized as pure image data (i.e. not
processed as text/line data), decrease the
setting for Photo from 260% to 170 - 190%.
NOTE: If the toner limit is lowered too much, it
may cause the density of shadow areas to be not
smooth.