Scanner Home Position Sensor And Operation - Canon CLC 1120 Service Manual

2. Scanner Home Position Sensor and Operation

Original scanner home
position sensor (PS1; SCHP)
The scanner home position sensor turns on only at the following timing:
· At the end of WMUP after power-on.
· At the end of pre-scanning.
· At the end of all scanning for the specified number of copies.
The sensor is not designed to turn on during continuous copying. If it should turn on because of
an erratic operation, the copier will immediately stop scanning.
Figure 3-104 shows the movement of the scanner during copying operation. (The start position
is the point reached by the scanner by moving approximately 61 mm from the home position.)
Pre-scanning
Move to the start position
Scanning during copying
operation
Last scanning
COPYRIGHT © 1999 CANON INC.
Scanner motor
Forward
Table 3-102
PS1
2mm
Home position
Figure 3-104
CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 3 EXPOSURE SYSTEM
In reverse
Switches to forward movement.
Moves 2 mm in reverse, and stops.
(The point at which it stops is the
home position.)
14mm
Start position
Operation
Leading edge of
an original
Original
3-3