Canon 1000 Service Manual page 183

b. Identifying the Size of Paper in the Multifeeder
The slide guide assembly of the multifeeder tray is equipped with a variable resistor, and the width of
paper is detected when the slide guide is moved against the edge of paper.
The length of paper, on the other hand, is checked in reference to how long the registration paper sensor
(PS1) remains ON.
The slide guide (front) and the slide guide (rear) each are equipped with a multifeeder paper sensor
(PS4, PS5) to check the presence/absence of paper. The message 'ADD PAPER' is indicated on the control
panel when either of them is off.
Slide guide (rear)
Multifeeder paper sensor
(rear: PS5)
J2207B
J2207B
-13
COPYRIGHT © 2001 CANON INC.
Variable resistor
Multifeeder relay PCB
-15
DC controller PCB
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
Multifeeder paper sensor
(front: PS4)
J2207B
-12
Figure 3-609
3. OPERATION AND TIMING
Slide guide (front)
3-139