Shifting The Photosensitive Drum Phase - Canon iR C6800 Series Service Manual

11.3.4 Shifting the Photosensitive Drum Phase

The photosensitive drum can develop drum memory unless the image write start position is shifted at specific
intervals. Be sure to shift the drum phase every so many copies/prints have been made as shown below.
<Overview of the Work>
1. Preparatory work
- making test copies
(service mode)
- disabling initial rotation
(service mode)
F-11-1
<When to Perform the Work>
every some copies or prints made continuously
when detaching and attaching the drum (i.e., when the initial drum phase is lost) Here,3.
"Mechanical Work" in the detailed instructions is not needed. To avoid the possible discrepancy in phase, however,
be sure to perform 1. "Preparatory Work" and 3. "Updating the Density Initial Data."
<Detailed Instructions>
1. Preparatory Work
1 1 Turn off the main power switch, and wait until the machine has entered a ready state.
1 2 To stabilize the machine operation, generate 5 test pattern printouts (A3, double sided) by executing the
following in service mode: COPIER>TEST>PG>TYPE=16.
Be sure not to forget to select a cassette loaded with A3 paper and double sided printing in service mode.
to select a particular cassette in service mode, execute COPIER>TEST>PG>PG PICK=3 or =4.
to select double sided printing in service mode, execute COPIER>TEST>PG>2 SIDE=1.
1 3 Set "1" to the following service mode to disable initial multiple rotation:
COPIER>FUNCTION>INSTALL>AINR OFF.
1 4 Turn off the main power switch.
2. Mechanical work
shifting the photosensitive
drum phase
3. Updating the density
initial data
- rewriting the density initial
data (service mode)
- executing auto gradation
correction
Chapter 11
0006-0350
11-13