Canon iR C6800 Series Service Manual page 907

13.3.2.4 Out of Focus
13.3.2.4.1 Color Displacement in Sub Scanning Direction
Cause
1.the shock occurring when the ITB cleaning blade goes on or off causes the transfer to the ITB to be displaced.
2.the shock occurring when the secondary transfer outside roller goes on or off causes the transfer to the ITB to be
displaced.
Filed Remedy (cause 1)
The following 3 remedies are offered for the field:
1. adjustment of the wire start position in sub scanning direction
2. change to the primary transfer color to color current level
<Adjustment>
1. Adjusting the Wire Start Position in Sub Scanning Direction
1) Print out a Rainbow Chart (by executing 31 in service mode: COPIER>TEST>PG>TYPE).
2) Check the printed chart to find out which color is displaced. (The machine is designed as a C base machine;
use yellow to serve as the point of reference).
3) Adjust the write start position of the displaced color in service mode.
if Y is displaced on the 1st side, execute the following in service mode: COPIER>ADJUST>IMAGE
REG>REG V Y
if M is displaced on the 1st side, execute the following in service mode: COPIER>ADJUST>IMAGE
REG>REG V M
if K is displaced on the 1st side, execute the following in service mode: COPIER>ADJUST>IMAGE
REG>REG V K
if Y is displaced on the 2nd side, execute the following in service mode: COPIER>ADJUST>IMAGE
REG>REG2 V Y
if M is displaced on the 2nd side, execute the following in service mode: COPIER>ADJUST>IMAGE
REG>REG2 V M
if K is displaced on the 2nd side, execute the following in service mode: COPIER>ADJUST>IMAGE
REG>REG2 V K
Chapter 13
0005-5828
13-35