Detecting The Presence/Absence Of An Original - Canon DU7-1101-000 Service Manual

2.

Detecting the Presence/Absence of an Original

The presence/absence of an original on the original tray is detected by the original sensor (S6).
When an original is placed on the original tray, the light from the light-emitting side of the origi-
nal sensor will be blocked, causing the light-receiving side of the sensor to send the original detection
signal (DTS) to the ADF controller PCB. In response, the ADF controller PCB turns on the Original
Set indicator.
If an original is detected,
ADF controller PCB
S6
(light-emitting side)
Blocks
the light.
S6 (light-receiving side)
COPYRIGHT © 1999 CANON INC.
ADF controller PCB
S6
(light-emitting side)
S6
(light-receiving side)
Original
Figure 2-209
CANON ADF FOR iR600 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 2 OPERATIONS
If an original is not detected,
ADF controller PCB
S6
(light-emitting side)
S6 (light-receiving side)
2-15