Making Checks On The Printer Side (Checking Halftone Density) - Canon iR7086 Series Service Manual

Chapter 14

14.1.6 Making Checks on the Printer Side (Checking Halftone Density)

iR7105 / iR7095 / iR7086
14-4
Check PG4 (blank)
NO
Is the output foggy?
YES
Make the following in service
mode:
COPIER>DISPLAY>DPOT>VDM.
NO
Is the reading of
<VDM> between 390
and 460?
YES
Make the following selections in
service mode:
COPIER>DISPLAY>DPOT>VL1M.
NO
Is the reading of
<VL1M> between 50
and 90?
YES
Decrease the value of the following
in service mode:
ADJUST>DEVELOP>DE-OFST.
- A lower value makes images
lighter.
F-14-5
Check PG6 (halftone)
Compared with
No. 6 and No. 7 (halftone),
is the density about
the same?
NO
Set the following in service mode
to between 1 and 9:
ADJUST>DENS>DENS-ADJ
- A higher value makes images
darker.
F-14-6
Go to
"Checking Halftone Density"
Check the potential
control system; if
normal, replace the
photosensitive drum.
Check the following; if
faulty, replace it:
1. Laser output
2. Potential control
system
YES
End.
0010-9299