Identifying The Size Of Copy Paper In The Cassette; Outline - Canon NP6251 Service Manual

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CHAPTER 5 PICK-UP/FEEDING SYSTEM

C. Identifying the Size of Copy Paper in the Cassette

The size of the copy paper inside the cassette is identified by the paper size sensor

mounted to the rear of the cassette holder.

When the cassette is slid into the cassette holder, the paper size sensor is pushed

by the boss on the cassette and turns on, thereby enabling identification of the width and

the length of the copy paper.

The copier uses combinations of widths and lengths of copy paper to find out the size

of the copy paper, and determines where to reverse the scanner and how to control the

blanking exposure mechanism.

The boss used to push the paper size sensor operates in conjunction with the guide

plate inside the cassette, and its position is set when the guide plate is set to suit the

2. Identifying the Size of Copy Paper

The copy paper length sensor consists of two photointerrupters, and the length is

identified with reference to combinations of the outputs of these two sensors.

The paper width sensor, on the other hand, is a variable resistor, and the resistance

output of the sensor is used to identify the width of paper.

Figure 5-206 shows the relationship between paper widths and variable resistor

outputs. You must register the correct basic settings whenever you have replaced the

DC controller PCB or the sensor so that the relationship may be maintained. (See

Chapter 11 "Registering the Paper Width Basic Value.")

Figure 5-206

CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)

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