Canon imageRUNNER ADVANCE 8105 Series Service Manual page 542

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Adjustment > When replacing parts > Image Formation System > Primary Charging Assembly
Image Formation System
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Primary Charging Wire
<Procedure of parts replacement>
see "Replacing the Primary Charging Wire," on p. 4-103.
<Procedure of adjustment>
1) Clear the parts counter. (COPIER>COUNTER>PRDC-1>PRM-WIRE)
2) Clean the Charging Wire. (COPIER>FUNCTION>CLEANING>WIRE-CLN)
3) Init of Primary Charging Wire current VL(COPIER>ADJUST>HV-PRI>PRI-GRID)
4) Execute the potential control (COPIER>FUNCTION>DPC>DPC). Turn OFF and then ON
the main power. (The potential control is executed at startup.)
5) Execute the potential control. (COPIER>FUNCTION>DPC>DPC)
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Primary Charging Assembly
<Procedure of parts replacement>
see "Removing the Primary Charging Assembly," on p. 4-96.
<Procedure of adjustment>
1) Output a halftone image using the service mode.
• TEST > PG > TYPE : 5
2) Execute the following procedure according to the density difference on the front and rear
sides of the test print image.
• When the front side test print image is dark, execute step 3.
• When the rear side test print image is dark, execute step 4.
•
When there is no uneven density, execute step 5 and the following.
When the front side test print image is dark
MEMO:
•
When the front side test print image is dark [1], execute step 3 until the density
becomes even. When the density becomes even, execute step 5 and the following.
• When the adjustment screw is turned clockwise, the Charging Wire goes down and
up (gap between grid and Charging Wire becomes narrow and wide). As a result, the
density of output image becomes light.
Note:
Be sure to adjust the dark side (density of the test print image) to be the light side.
5
Adjustment > When replacing parts > Image Formation System > Primary Charging Assembly
3) Make the resin screws [A] and [C] a full turn clockwise. While referring to the
replacement procedure of the Primary Charging Assembly, install it to the main body, output
a test print and check the image.
Note:
Since uneven density might occur, be sure to adjust by turning the 2 adjustment
screws with the same amount.
[1]
[C] [A]
5-7
F-5-5 F-5-5
5-7