Controlling The Output To Suit The Environment - Canon imageRUNNER 7095 Service Manual

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7.8.1.2 Controlling the Output to Suit the Environment

The transfer guide bias is optimized to suit the environment (identified with reference to the data from the

environment sensor).

A bias of the same polarity as the toner is

applied in sync with the rotation of the

photosensitive drum.

Normally, +600 V is applied to prevent

adhesion of toner to the transfer guide.

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.

Normal/low humidity

High humidity

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.

The photosensitive drum is rotating;

yet, paper is not being fed.

Transfer guide bias

Paper passing

Paper being fed

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