Canon 1000 Service Manual page 211

6. Correcting Displacement of the Transfer Belt
When rotated continuously, the transfer belt tends to shift to the front or the rear. The transfer belt end
sensor 1 (front; PS17) and the transfer belt end sensor 2 (rear; PS18) are used to monitor such movement of
the transfer belt; when displacement occurs, the transfer belt swing motor (M13) tilts the swing roller so that
the transfer belt is moved askew in the opposite direction, thereby correcting the displacement.
To prevent full displacement and, thereby damage, of the transfer belt, the transfer belt end sensor 3
(front; PS19) and the transfer belt end sensor 4 (rear; PS20) are used.
See Figures 3-635, -636, and -637 for diagrams of the mechanism used to correct displacement of the
transfer belt, from detecting displacement to moving the swing roller.
If the CPU on the DC controller PCB detects the activation of each of the sensors under the following
conditions, 'E075' will be indicated on the control panel:
• The transfer belt edge sensor 1/2 (PS17/PS18) detects the end of the transfer belt (sensor lever not
over the sensor) longer than a specific period of time.
• The transfer belt end sensor 3/4 (PS19/PS20) detects the end of the transfer belt (sensor lever over
the sensor).
M14
Transfer belt motor
Sensor lever
Drive roller
COPYRIGHT © 2001 CANON INC.
Transfer belt
PS18
PS20
Transfer belt
rotation
PS19
direction
Sensor lever
Figure 3-635
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
M13
Transfer belt swing motor
PS17
Front of copier
3. OPERATION AND TIMING
Linked roller
Swing roller
3-167