pg. 132
Description
There is a case when color displacement occurs in such a way that an amount of displacement in Bk
fluctuates in the vertical scanning direction.
The below shows the output image of PG31, [a] shows the paper feed direction, [1] to [5] show the number
of sheets, and [3] shows correct image.
Cause
Due to the failure in the encoder or the control PCB of the Drum Drive Assembly, the rotational speed of the
drum becomes unstable, resulting in color displacement.
[Reference] Color displacement may also occur because of changes in outside air temperature/ temperature
increase inside machine/ machine relocation.
Field Remedy
Assuming that the previous measure against mottled blank on image (thin ITB/ increased ITB tension/
decreased primary transfer roller pressure) has been already implemented and the system software has
been upgraded to Ver. 70.09 (DCON Ver. 66.05) or later, clean the sensor or the encoder of the Drum Drive
Unit (Bk) or replace the Drum Drive Unit (Bk) (FM1-B788-000) following the steps below.
1) Turn OFF the main power SW and open the front cover.
2) Remove the Upper Front Cover
3) Remove the ITB Inner Cover. Turn the ITB Pressure Release Lever to the left to release the pressure.
4) Remove the Front Inner Handle Left Cover and the Front Inner Handle Right Cover, and open the
Process Unit Inner Cover.
5) Remove the Developing Assembly (Bk).
[Caution]
- Be sure not to touch the surface [A] of the developing cylinder, otherwise failure may occur in the output
image.
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Страница 3: ...1 Symptoms Solutions For the imageRUNNER ADVANCE C9075 C7065 Series ...
Страница 49: ...47 b 23 Remove the 2 screws 1 1 stepped screw 2 and 1 hook 3 to detach the hopper unit Bk 4 ...