Canon 1000 Service Manual page 75

2. Original Scanner Home Position Sensor and Operations
Original scanner home position
sensor (PS37: SCHP)
The original scanner home position sensor turns on:
• At power-on.
• At start of copying.
• At end of original scanning.
• During CCD adjustment (service mode).
[1]
HP search at power
-on
[2]
Shading correction
[3]
Original detection
[4]
Original scan
COPYRIGHT © 2001 CANON INC.
Original scanner motor
Forward
Table 3-201
PS37
1mm
HP Start position
Figure 3-204
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
Reverse
Switches to forward movement.
Moves forward 1 mm, then stops.
(The position reached is home
position.)
Original leading edge
8mm
3. OPERATION AND TIMING
Operation
Original
3-31