Image Adjustment Basic Procedure - Canon CLC5000 Service Manual

1.1 Image Adjustment Basic Procedure

COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON CLC5000 REV.0 JAN. 2001
START
Set 'PASCAL' to '0' under
'ADJUST'.
Execute service mode at
'TEST->PG=05 (halftone),
A4, and copy count 15'.
Is
there
an appreciable difference
YES
in copy density between
the 1st copy and
the 15th
1. 1.Set to 'DNES-Y/M/C/K
copy?
=20'; then, generate 20
NO
copies at 'PG=05 (halftone)'.
2. Check the internal static
eliminator roller.
Check the height of each
3. Check the internal static
charging wire, and clean
eliminator high-voltage
each wire.
system.
Clean the dust-proofing glass.
Make several copies using
the CA-1 Chart.
Make the following copies under 'TEST' in service mode.
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
Is the
image fault (difference
NO
in density between front and
rear, fogging, uneven density)
on the copies of the
CA-1 Chart
only?
YES
Check the original exposure
system.
CHAPTER 5 TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
Are there
YES
wavy lines on the
copies?
1. Check the separation
charging assembly for dirt.
NO
2. Check the separation
charging assembly for leakage.
Are there
YES
toner splashes on the
copies?
1. Check the high-voltage
system for separation charging.
2. Check the high-voltage
NO
system for pre-fixing charging.
3. Check the environment
Is there
sensor.
a difference in
density between left and NO
right on copies made at
PG=04
(17 gradations)
?
YES
Execute 'INSTALL->STIR-Y/
M/C/K' (for the problem color).
Check to see if the grid plate
is mounted properly.
YES
NO
Is the image darker
at the rear?
YES
Turn the charging wire Turn the charging wire
height adjusting screw at height adjusting screw at
the front of the primary the front of the primary
charging assembly for the charging assembly for the
problem color clockwise. problem color counter-
clockwise.
3/4 turn
Generate Test Print TYPE=4.
Checking the Original Exposure System
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.
F05-101-01
Is
a specific
color suffering from
NO
an image fault (density difference,
fogging, low
density)?
YES
YES
YES
Set 'PASCAL' to '1' under
'ADJUST' in service mode.
Excute auto gradation correction
(full correction).
NO
Is the color balance
normal?
YES
YES
3/4 turn
YES
END
Check
the transfer system
(a of next page). Is the problem
corrected after performing
the instructions?
NO
Check
the latent image
formation system (b of next
page). Is the problem
corrected after
performing the
instructions?
NO
Check
the developing
system (c of next page).
Is the problem corrected
after performing the
instructions?
NO
Execute
'FUNC->CCD->
AUTOADJ' in service mode.
Is the problem
corrected?
NO
Execute 'FUNC->EPC->
in service mode.
Execute auto gradation
correction (full correction)
in user mode.
Is the color
balance normal?
NO
Adjust 'COL-ADJ' in
user mode.
5-3