COPYRIGHT © 2001 CANON INC.
2001200120012001
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
7-3
I. MAINTENANCE AND SERVICING
A. Image Adjustment Basic Procedure
Select M in user mode, and at PG=04 (17 gradations).
Select C in user mode, and at PG=04 (17 gradations).
Select Y in user mode, and at PG=04 (17 gradations).
Select K in user mode, and at PG=04 (17 gradations).
At PG=05 (halftone), DNES-M=48, DNES-C/Y/K=0
At PG=05 (halftone), DNES-C=48, DNES-M/Y/K=0
At PG=05 (halftone), DNES-Y=48, DNES-M/C/K=0
At PG=05 (halftone), DNES-K=48, DNES-M/C/Y=0
At PG=14 (full color, 17 gradations), TXPH=0, THRU=1
START
Execute service mode at
'TEST > PG=05 (halftone),
A4, and copy count 15'.
Is
there
an appreciable difference
in copy density between
the 1st copy and
the 15th
copy?
1. 1.Set to 'DNES-Y/M/C/K
=20'; then, generate 20
copies at 'PG=05 (halftone)'.
2. Check the internal static
eliminator roller.
3. Check the internal static
eliminator high-voltage
system.
YES
NO
Make the following copies under 'TEST' in service mode.
Is the
image fault (difference
in density between front and
rear, fogging, uneven density)
on the copies of the
CA-1 Chart
only?
NO
YES
Are there
wavy lines on the
copies?
1. Check the separation
charging assembly for dirt.
2. Check the separation
charging assembly for leakage.
YES
NO
Are there
toner splashes on the
copies?
1. Check the high-voltage
system for separation charging.
2. Check the high-voltage
system for pre-fixing charging.
3. Check the environment
sensor.
YES
NO
NO
NO
YES
YES
Is the image darker
at the rear?
Turn the charging wire
height adjusting screw at
the front of the primary
charging assembly for the
problem color clockwise.
Generate Test Print TYPE=4.
Execute 'INSTALL->STIR-Y/
M/C/K' (for the problem color).
YES
Check to see if the grid plate
is mounted properly.
1. Check the mounting position of the copyboard glass, standard
white plate, scanning lamp reflecting shade, and No. 1/2/3
mirror.If dirt is found, clean the part.
2. Check to see if the No. 1 mirror mount or the No. 2 mirror
mount should have ridden over the rail.
3. Check to see if the values in service mode are as indicated
on the service label.
If there is no problem after the above checks and cleaning,
execute 'FUNC > CCD > AUTOADJ' in service mode.
Checking the Original Exposure System
Is
a specific
color suffering from
an image fault (density difference,
fogging, low
density)?
NO
YES
Set 'PASCAL' to '1' under
'ADJUST' in service mode.
Excute auto gradation correction.
Check
the transfer system
(a of next page). Is the problem
corrected after performing
the instructions?
YES
Check
the latent image
formation system (b of next
page). Is the problem
corrected after
performing the
instructions?
NO
YES
Check
the developing
system (c of next page).
Is the problem corrected
after performing the
instructions?
NO
NO
Is the color balance
normal?
YES
NO
YES
NO
Execute auto gradation
correction in user mode.
YES
NO
Adjust 'COL-ADJ' in
user mode.
END
Execute
'FUNC > CCD >
AUTOADJ' in service mode.
Is the problem
corrected?
Is the color
balance normal?
Execute 'FUNC > EPC >
in service mode.
3/4 turn
Turn the charging wire
height adjusting screw at
the front of the primary
charging assembly for the
problem color counter-
clockwise.
3/4 turn
Set 'PASCAL' to '0' under
'ADJUST'.
Check the height of each
charging wire, and clean
each wire.
Clean the dust-proofing glass.
Make several copies using
the CA-1 Chart.
Check the original exposure
system.
Is there
a difference in
density between left and
right on copies made at
PG=04
(17 gradations)
?
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