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COPYRIGHT
©
2000 CANON INC. CANON imageRUNNER 600 REV.1 JAN. 2000 PRINTED IN U.S.A.
13-4
2 Checking the Printer Side (1/2)
Is there a
difference in density
between front and
rear?
Is the rear side lighter?
Turn the adjusting screw
at the front of the primary
charging assembly
counterclockwise
(maximum of 2 turns).
Turn the adjusting screw at the
rear of the primary charging
assembly counterclockwise
(maximum of 2 turns).
Turn off and then on the power
switch, and generate one test print
using PG7 or PG4.
[1] If a difference in density remains after giving the adjusting
screw 2 turns on one side (a single turn causes a change of
about 0.7 mm), check the charging assembly, scanning lamp,
and scanner for dirt.
[2] When turning the adjusting screw counterclockwise, be sure
the distance between the wire and the grid wire will not be less
than 7.5 mm.
Is the image
free of blurring and the
density optimum?
Is the test print PG6
(blank) foggy?
Is the reading of
'VDM' between
432 and 452?
Is the reading
of 'VL1M' between
62 and 82?
Set the following to '2' through '7' in
service mode:
OPTION>BODY>CNT-W/HM
•A higher setting will make the
density higher (darker).
Check the following of the
developing assembly system:
[1] developing bias
[2] coating of toner on the sleeve
<Checking the Density Slope>
<Checking the Solid Black Density>
YES
NO
YES
NO
YES
NO
NO
YES
NO
YES
YES
NO
Are there
vertical lines in
the image?
Are there
vertical lines in
the image?
<Checking the Image>
• Use PG4, PG7, and PG8.
YES
YES
NO
NO
Executing
Potential Control
Check the image using PG4.
Check PG8 (solid black).
Caution:
If the wire is moved away from the photosensitive drum, the
image density will increase; if it is moved to the drum, the density
will decrease.
Reference:
Select COPIER>DISPLAY>DPOT>VDM
in service mode.
Select COPIER>DISPLAY>DPOT>VL1M
in service mode.
A
Clean the following, and check
them for adhesion of foreign
matter:
[1] dust-proofing glass
[2] each charging assembly
Check the following; if faulty,
replace parts as needed:
[1] laser output
[2] potential control system
Check the primary charging
system and the potential control
system; if normal, replace the
photosensitive drum.