Generating Transfer Bias; Toner Cartridge; Toner Level Detection; Toner Cartridge Absence/Presence Detection - Canon LBP3010 Series Service Manual

Hide thumbs Also See for LBP3010 Series:

Service manual (146 pages)

Table of Contents

2.4.2.4 Generating Transfer Bias

LBP3100 / LBP3010B

Transfer bias (TR) is a bias that is output to transfer toner to papers. There are two types of bias; DC positive bias and DC negative bias, and generated by the transfer

high-voltage generating circuit in the high-voltage power supply circuit. The DC positive bias is output at the time of toner transfer, and the DC negative bias at the

time of cleaning the photosensitive drum.

The high-voltage power supply circuit applies the generated transfer bias to the transfer roller according to each print sequence.

Each print sequence is described below.

- Cleaning bias:

The bias to move (clean) the toner attached to the transfer roller to the photosensitive drum at the time of warming up or last rotation sequence.

The transfer negative bias is applied to the transfer roller.

- Paper intervals bias:

The bias to prevent the toner remained on the photosensitive drum from attaching to the transfer roller at paper intervals during continuous printing. A minor

transfer positive bias is applied to the transfer roller.

- Print bias:

The bias to transfer the toner on the surface of the photosensitive drum to papers at the time of print sequence. The transfer positive bias is applied to the transfer

roller.

2.4.3 Toner Cartridge

2.4.3.1 Toner Level Detection

LBP3100 / LBP3010B

This equipment has no function of toner level detection.

2.4.3.2 Toner Cartridge Absence/Presence Detection

LBP3100 / LBP3010B

The engine controller detects the position of the Toner cartridge detection flag to judge the absence/presence of the Toner cartridge.

At the time of turning on the power or closing the upper cover, the engine controller judges the position of the Toner cartridge flag based on the output result of the

leading edge sensor (PS801).

When the output result of PS801 is L, it is judged that the Toner cartridge is absent; If being H, it is judged that the Toner cartridge is present.

The leading edge sensor performs both this detection and paper feed detection. Therefore, the engine controller cannot make a judgment of 'Toner cartridge absent'

or 'jam occurrence' when jam occurs.

The engine controller judges this case as 'Toner cartridge absent' and notices it to the main controller.

If jam occurs when 'Toner cartridge absent' is detected, check if there is a fault in the leading edge sensor and the detection flag.

PS801

Top of paper

sensor detection flag

Toner cartridge = No

PS801="H"

Engine controller