Fixed Displacement In Bk Occurs In A Large Quantity Of Print Job - Canon imageRUNNER ADVANCE C5000 Series Technical Workbook

- If color displacement in the horizontal scanning direction occurs only on the first to 4th sheets, refer to
"Color displacement in the horizontal scanning direction occurs only on the first to 4th sheets."
- If large color displacement suddenly occurs in the horizontal scanning direction, refer to "Large color
displacement suddenly occurs in the horizontal scanning direction".
- If fluctuating displacement in any color of YMC occurs in the vertical scanning direction, "Fluctuating
displacement in any color of YMC occurs in the vertical scanning direction."
- If fluctuating displacement in Bk occurs in the vertical scanning direction, refer to "Fluctuating displacement
in Bk occurs in the vertical scanning direction".
Symptom

Fixed displacement in Bk occurs in a large quantity of print job

Description
Color displacement of Bk in a uniform way in a large quantity of print job occurred in Field cases.
Cause
While a large quantity of print was being made, the temperature inside the main body rose up from the heat
of the fixing unit, etc. As a result, the laser scanner unit became expanded and displaced the laser
irradiated position.
Especially with Bk, because the mechanism of Bk is different from those of the rest of the colors (Y/M/C), the
level of the displacement of the laser irradiated position for Bk became higher than those for the other colors,
so that the color displacement of Bk appeared.
[Reference] Color displacement may also occur because of changes in outside air temperature/ machine
relocation.
Field Remedy
Perform the following steps on the premise that the previous measure against mottled blank on image when
using papers of rough surface (reducing the thickness of ITB/increasing ITB tension/decreasing pressure of
the primary transfer roller) were taken and the system software was upgraded to Ver.70.09 (DCON
Ver.66.05) or later.
1) In Service Mode > Mode List > COPIER > Function > INSTALL > "INIT-ITB," and adjust the ITB neutral
position.
2) In Service Mode (LEVEL2) > Mode List > COPIER > Option > FEED-SW > PINT-REG > and change to
"1". (Default value: 0, Range of setting: 0 to 5)
[Reference] With the said setting, color displacement correction will be changed to perform every 200 sheets
printed, so that the color displacement in a large quantity of print job is prevented. With the default setting,
color displacement correction will be performed every 1000 sheets printed.
3) Settings/Registration > Adjustment/Maintenance > Adjust Image Quality > Auto Correct Color Mismatch >
press "Start."
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