Detecting An Original - Canon NP6412 Service Manual

CHAPTER 8 ADF
D.

Detecting an Original

1. Outline
The ADF's original detection mechanism has the following two functions:
1. Detecting the Presence/Absence of an Original
Checks whether there is an original on the original tray.
2. Identifying the Length of the Original
Checks the length of the original placed on the original tray.
3. Detecting the Presence/Absence of an Original
The original placement sensor (PI3) is used to check the presence/absence of an original.
When an original is placed on the original tray, the original placement sensor (PI3) sends the
original detection signal (PDP3) to the ADF controller PCB in response to the movement of the
detecting lever away from the sensor.
8-6
COPYRIGHT © 1999 CANON INC.
Original
Original tray
Detecting lever
PI3
ADF controller PCB
Figure 8-106
CANON NP6512/6612/7120/7130/7130F REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)