The machine checks the amount of paper remaining based on the reading of a variable resistor that operates in conjunction with the movement of the lifter drive

shaft.

SERVICE MODE:

COPIER> ADJUST> CST-ADJ> C3-LVOL

Indicates the value when 50 sheets of paper exist in cassette 3.

COPIER> ADJUST> CST-ADJ> C3-HVOL

Indicates the value when 275 sheets of paper exist in cassette 3.

COPIER> ADJUST> CST-ADJ> C4-LVOL

Indicates the value when 50 sheets of paper exist in cassette 4.

COPIER> ADJUST> CST-ADJ> C4-HVOL

Indicates the value when 275 sheets of paper exist in cassette 4.

8.4.5 Identifying the Size of Paper (cassette 3/4)

iR5065 / iR 5055 / iR5075 / / /

Outline

The machine uses the paper size sensor mounted to the rear of the cassette holder to identify the size of paper inside the cassette.

When the cassette is slid into the cassette holder, the paper size sensor is pushed by the boss on the cassette, permitting the machine to detect the width and the

length of paper. The DC controller PCB identifies the size of the paper with reference to the combination of its width and length, and communicates the result of

identification to the controller unit and the reader unit.

The boss pushing the paper size sensor works in conjunction with the guide plate inside the cassette, and its location is determined when the guide plate is set to

suit a specific paper size.

Identifying the Size Paper

The paper length sensor consists of 2 photointerrupters, and the combination of its 2 outputs is used to find out the length of paper.

The paper width sensor, on the other hand, is a variable resistor, and the machine refers to the reading (resistance) of the sensor to find out the width of paper.

Paper sensor

Paper detecting lever

Lifter

F-8-15

T-8-11

3 bars

100% to about 50% of capacity

2 bars

about 50% to about 10% of capacity

1 bar

10% or less of capacity

no bar