Image Blanking On The Leading Edge Of Sheet With Heavy Paper Under A Low Temperature Environment - Canon imageRUNNER ADVANCE C3330 Series Troubleshooting Manual

Copier Color | iR-ADV C3330/C3325/C3320 Series |
Image blanking on the leading edge of sheet with heavy paper
under a low temperature environment
[Symptom]
When a heavy paper is used under a low temperature environment, image blanking [a] may occur on the leading edge.
This symptom does not occur when the leading edge margin is 4mm or more.
The arrow [b] indicates the direction of feeding.
[Cause]
If feeding hard heavy paper into machine, a tiny space may be formed between the trailing edge of paper just in front of the nip
of the secondary transfer roller and ITB as the paper [a] presses ITB [b] toward inside while being fed.
If electricity is discharged in this space, polarity of toner on ITB changes and the toner will not be transferred onto the paper. This
results in the above mentioned symptom. This symptom is likely to occur in a low humidity environment where the set value of
the secondary transfer voltage is high.
[Service work]
Choose and perform among the below a), b) and c) according to the conditions under which the customer is operating.
a) Widen the leading edge margin of the sheet
a-1) Increase the setting value of Service mode > Mode List > COPIER > Adjust > BLANK > [BLANK-T].
Change of the adjustment value by "1" increases the leading edge margin of the sheet 0.04mm.
The range of setting is from "0" to "1000"
[Caution] Change of the setting increases the trailing edge margins of all the output.
a-2) Output the image having shown the symptom, and check that the symptom does not occur.
If the symptom has not improved sufficiently, fine-tune the setting values in the steps a-1)
b) Extend the range where leading edge weak bias is applied.
b-1) Increase the setting value of Service mode (Lv2) > Mode List > COPIER > Adjust > HV-TR > [T2TR-LNG].
Change of the adjustment value by "1" extends the range where leading edge weak bias is applied 0.1mm.
The range of setting is from "-100" to "+100" ("0" by default).
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