Canon iR7086, Руководство по обслуживанию

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Chapter 7
7-26
F-7-36
7.8.1.2 Controlling the Output to Suit the Environment
0010-8069
iR7105 / iR7095 / iR7086
The transfer guide bias is optimized to suit the environment (identified with reference to the data from the environment sensor).
F-7-37
SERVICE MODE:
- COPIER> OPTION> BODY> TRNSG-SW (transfer guide bias control mode switchover)
0: switches to +200 V in a high-humidity environment (default)
1: fix the transfer guide bias to +600 V
2: fix the transfer guide bias to +200 V
3: switches to +200 V in a normal humidity condition
4: switches to +200 V in a low humidity condition
Set it to '2' through '4' if a transfer fault is noted.
7.8.2 Transfer Charging Mechanism
7.8.2.1 Outline
0010-8070
iR7105 / iR7095 / iR7086
DC controller PCB
High-voltage DC PCB
J510A
DC 600V/200V
J723
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
0 V
24 VH 24 VH
HVDC_REMOTE
FEEDER_GUIDE_ON
When '1', high-voltage
output is ready.
When '1', the transfer
guide bias goes on.
GND GND
1 2 3 4
Relay PCB
Transfer guide
J733
2
3
FEEDER_GUIDE_CNTR
"1": +200V
"0": +600V
2
1
J721
17
18
1
Transfer guide bias
Paper passing
+600
+200
Paper being fed
+600
+600
Normal/low humidity
High humidity
A bias of the same polarity as the toner is
applied in sync with the rotation of the
photosensitive drum.
The photosensitive drum is rotating;
yet, paper is not being fed.
Normally, +600 V is applied to prevent
adhesion of toner to the transfer guide.
In a high humidity environment, paper tends to absorb moisture
(lower resistance), charging the paper in excess to affect transfer
(faulty transfer); as such, the output is decreased.