Canon imagePRESS C800 Series, Troubleshooting Manual

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Chapter 1
1-22
6) If the adjust secondary transfer voltage screen is displayed, the presetting is completed.
7) Select Front Side in the adjust secondary transfer voltage screen, press "+" button five times and if the corrected value[a] is confirmed to be "+5", then press "OK".
The range of setting is from "-20" to "+20" ("0" by default). Changing this value changes the secondary transfer voltage.
[Caution] Changing this setting may increase the secondary transfer voltage and lead to poor image (coarse image/poor transfer with high density original, etc.).
8) Output the image having shown the symptom, and check that the symptom does not occur. If the symptom no longer occurs, the work is completed.
If the symptom does not show an improvement, go back to the step 7) and change the value by one at a time up to "+7".
1.1.1.5.3 White spots by drum pitch due to soiling fused on drum in specific environment (H/H)
0031-7947
[ Case in the field ]
Description
If the Process Unit (Y)/(M)/(C) or Drum Unit (Bk) is used in a specific environment, white spots on images by the drum pitch may occur. The cause is considered
to be the fusing on the drum. The following field remedy explains the cleaning step for the drum with fusing separately for the color drum and black drum.
Field Remedy
[Caution]
Following is a list of cautions when working.
- Do not clean unless fusing occurred due to the possibility of image failure occurring from the deterioration of the drum by light.