Canon iR5570 Series Reference manual

(1/5)
Service Bulletin
Issued by Canon Europa N.V. COPIER B/W
HARDWARE
Location:
Laser Scanner Unit
Subject:
Correcting light images and fogging
Particulars:
<Symptom>
The printout may show any of the following symptoms: the entire image is too light; the area in the middle in
sub scanning direction is foggy; the image along the edge in sub scanning direction is too light.
Cause
1. Condensation occurred inside the machine (e.g., as when the machine is turned on immediately after it has
been moved from a low to normal temperature environment as from a warehouse to an office or after it has been
left without power for a long time).
2. The laser scanner unit has become displaced because of vibration/ impact occurring while the machine is
moved.
Factory Remedy
The following will be implemented to prevent displacement of the laser scanner unit:
1. Change the part used to keep the laser unit in place to increase its retention power (pressure).
2. Change the configuration of engagement between the scanner unit and the machine.
Model:
iR5570
iR6570
Ref No.:
iR6570-002
(F1-T01-0M5-10008-01)
Date:
May, 2005

iR6570-002
(2/5)
Points to Note About Servicing:
Go through the following if any of the foregoing symptoms has occurred:
1. Eliminate condensation inside the machine:
1-1. Set the environment switch (drum/ non-interruptive switch) to ON (default: OFF).
1-2. Set "1" to the following in service mode (Level 2): COPIER>OPTION>BODY>DRUM-H-SW
(default: "0").
2. Check the level of laser power (to check for displacement of the scanner unit).
2-1. Return all of the following to the default settings indicated on the service label in service mode:
COPIER>ADJUST>V-CONT>EPOTOFST/VL-OFST/VD-OFST/DE-OFS-P/VD-OFS-P/DE-OFST/VL-
OFS-P.
2-2. Set"1"to the following in service mode: COPIER>FUNCTION>DPC>DPC (to force execution of
potential control).
2-3. Hold down the control panel power switch for 3 seconds or more.
2-4. Go through the shut-down instructions on the screen so that the main power switch may be turned off.
2-5. Turn off the main power switch.
2-6. Turn on the main power switch.
2-7. Execute "COPY SERVICE REPORT" by making the following selections in service mode:
COPIER>FUNCTION>MISC-P>P-PRINT>OK; then, check the values on P-8 (8th page) for LPOWER-P
and LPOWER-C.
If either of the two is 221 or higher, go through the instructions in step 2-8 to correct the mounting of the laser
scanner unit.
If both are 220 or lower, on the other hand, go to step 3.

iR6570-002
(3/5)
<Points to Note When Mounting the Scanner Unit>
1) To eliminate condensation inside the machine, it is important that the drum heater is kept ON while
remounting the scanner unit. Be sure to go through the shut-down instructions when turning off the power.
2) When fitting the laser scanner unit in the machine, be sure to push the top [A] of the unit with your
fingers and push it until it butts against the rear.
3) Do not push the bottom [B] of the laser scanner unit [1]; doing so may hinder the mounting work.
2-8. For instructions on disassembly and assembly, see the section "Removing the Laser Scanner Unit" in the
Service Manual.
4) Before tightening the screw, check to be sure that the gap [t] between the laser scanner unit [1] and the
mounting base [D] is no wider than a sheet of plain paper (about 0.1 mm thick).
5) There is a small protrusion [2] on the laser scanner unit, resulting in a gap of about 0.04 mm between
the unit and the mounting base.
[A]
[B]
[1]
[B]
[C]
[1] [D]

iR6570-002
(4/5)
2-9. Set "1" to the following in service mode: COPIER>FUNCTION>DPC>DPC (to force execution of
potential control).
2-10. Hold down the control panel power switch for 3 seconds or more.
2-11. Go through the down-sequence instructions on the screen so that the main power switch may be turned
off.
2-12. Turn off the main power switch.
2-13. Turn on the main power switch.
2-14. Make the following selections in service mode to print out a Copy Service Report:
COPIER>FUNCTION>MISC-P>P-PRINT>OK. Check the values on P-8 (8th page) for LPOWER-P and
LPOWER-C. If both are 220 or lower, go to step 3. If either of them is 221 or higher, repeat steps from 2-8
through 2-14.
3. Check the images (be sure to allow 15 minutes or more after turning on the environment switch and the drum
heater. Otherwise, the same symptom is likely to occur once again because of condensation).
3-1. Select the source of paper containing A3 by making the following selections in service mode:
TEST>PG>PG-PICK.
3-2. Make the following selections in service mode: TEST>PG>TYPE; then, type in "5" and press OK.
3-3. Select "PG-QTY" and type in "2"; then, press OK.
3-4. Press the Start key; when 2 A3 sheets have been discharged, put TYPE>5 back to 0>PG-QTY>1.
3-5. Check the images and if they are free from the foregoing symptoms, go to step 6. Otherwise go to step4.

iR6570-002
(5/5)
4. Replace the developing assembly.
4-1. For instructions on disassembly and assembly, see the section "Removing the Developing Assembly" in
the Service Manual.
5. Check the images.
5-1. Check the images as in step 3.
5-2. If the images are free of the foregoing symptoms, go to step 6. Otherwise, go to step 6 and then check
other possible causes.
6. Put the drum heater and the environment switch back to their initial settings.
6-1. Set "0" to the following in service mode (Level 2): COPIER>OPTION>BODY>DRUM-H-SW
(default: "0").
6-2. Put the environment switch (drum/ non-interruptive switch) back to the setting used before starting the
work.
Machines Provided with the Factory Remedy
The serial numbers of those machines that have been provided with the factory remedy will be communicated as soon
as they are identified.

Flow of Work: Correcting Image Faults in the iR6570/5570
· Entire image too light
· Area in middle foggy
· Image along edge too
light
Drum heater ON
Check laser
power
Re-mount laser
scanner
NO (221 or higher)
Check laser
power
Check image
YES (220 or lower)
YES
END
NO
(221 or hi
g
her)
Replace developing
assembly
Check image
YES
Put back drum
heater switch
setting
NO
NO
Suspect other
cause
Put back drum
heater switch
setting
END
Force potential
control
YES
(220 or
lower)
Allow 15
min or
more