Correcting The Output At The Trailing Edge Of Paper; Transfer Charging Assembly Cleaning Mechanism - Canon iR7086 Series Service Manual

Chapter 7

7.8.2.3 Correcting the Output at the Trailing Edge of Paper

iR7105 / iR7095 / iR7086
When copy paper moves in contact with the transfer charging assembly, the resistance of the assembly drops abruptly as soon as the paper leaves, possibly permit-
ting discharge current to flow momentarily, causing transfer faults or image smears along the trail edge of the image. The machine is designed to correct (decrease)
the transfer current to prevent these faults.
In a low humidity environment, paper tends to dry
up collecting excess charges (high resistance); to
counter, the output is reduced.
SERVICE MODE:
- COPIER> OPTION> BODY> TRSW-P-B (enabling/disabling transfer current output correction control)
1: does not vary the transfer current value (default)
(transfer faults occurring along the trail edge of paper)
0: corrects the transfer current value along the trail edge of paper

7.8.2.4 Transfer Charging Assembly Cleaning Mechanism

iR7105 / iR7095 / iR7086
7-28
The output of the transfer current is
varied over a width of 20 mm along
the trailing edge of paper.
Feeding direction
Single-sided printing
Low humidity
Normal humidity
High humidity
Paper
F-7-40
When making a double-sided print, paper will absorb fixing
oil and tend to collect less charges (low resistance); since
the discharge current along the trailing edge of paper will
be low, the output is not varied.
Transfer current correction (µA)
Double-sided printing
+220
+150
F-7-41
20 mm
0010-8072
0010-8074