Canon imagePRESS C800 Series Troubleshooting Manual page 137

Chapter 1
Please explain the actions to take after replacing the Grid Plate.
Field Remedy
1) Clear the parts counter.
Service Mode > Service Mode > COPIER > Counter > PRDC-1 > PRM-GRID (Primary Charging Grid Plate parts counter)
2) Execute the Charging Wire cleaning.
Service Mode > COPIER > Function > CLEANING > WIRE-EX (Cleaning of Charge Wire (5-reciprocation))
3) Execute the potential control.
Service Mode > COPIER > Function > DPC > DPC (Execution of potential control: 1/1 speed)
4) Output the pattern generator for adjustment of the wire height.
Service Mode > COPIER > Function > MISC-P > GRID-ADJ (Primary Charge Wire height adjusting PG output)
[Caution]
PG can be output only under the following conditions.
- Paper type: Plain paper 1/2
- Paper size: A3+ 329.0 mm x 483.0 mm (13" x 19")/A3/SRA3/Ledger 279.4 mm x 431.8 mm (11" x 17")*/A3+ 305.0 mm x 457.0 mm (12" x 18")
(* Ledger 279.4 mm x 431.8 mm (11" x 17") is supported with DCON Ver. 4.01 or later.)
- Paper source: Cassette 1
Under conditions other than those mentioned above, "NG" is displayed and a blank paper is output.
- This item must be executed after "READY" is displayed. While "WAIT" is displayed, This item is not executed even if OK key is pressed.
- When outputting PG using paper other than A3 extra-long paper which size is 329.0 mm x 483.0 mm (13" x 19"), soiled back of the paper due to secondary transfer
may occur. When soiled back of paper occurs, execute cleaning of roller from Settings/Registration menu.
5) In the case of density difference between the front and the rear on the test print image with the dark image on the front side of the test print, go to step 6) to make
adjustments. With the dark image on the rear side of the test print, go to step 7) to make adjustments. If there is no density unevenness, execute the work in step 8)
and later.
6) Adjust the Primary Charging Assembly (in the case of dark image at the front side on the test print).
In the case of dark image at the front side of the test print, execute step 6-1) through 6-3) below until the density gets even. Then, if there is no density unevenness,
execute the work in step 8) and later.
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