Canon imagePRESS C800 Series, Troubleshooting Manual

Page: 139 / 256

Chapter 1
1-125
11) Execute the uneven density correction.
Settings/Registration > Adjustment/Maintenance > Adjust Image Quality > Correct Shading
[Reference] The replacement timing for the Grid Plate is as follows.
- imagePRESS C800: 600,000 sheets
- imagePRESS C700: 500,000 sheets
FC0-9857 PLATE, ETCHING GRID
1.1.7.1.40 Points to note after replacing Primary Charging Assembly
0031-6187
[ Manual-related ]
Description
Please explain the actions to take after replacing the Primary Charging Assembly.
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.