Canon 1000 Service Manual page 207

4. Detecting the Home Position of the Transfer Belt
The transfer belt is moved by the drive of the transfer belt motor (M14). As many as five (A4/LTR) sheets
of paper may be retained on the transfer belt by the charges from the transfer blade.
If paper was put on the transfer belt using the same timing at all times, different sizes and copy modes
would put some sheets over the seam of the transfer belt. Transfer on paper kept over a seam would
adversely affect the images because of uneven charging efficiency.
To prevent such a problem, a seam detection sticker is put on the transfer belt. When the Start key is
pressed, the transfer belt home position sensor (PS16) detects the seal so as to control the timing at which
the registration roller turns on, thereby making sure that paper will not be put over the seam. (See Figure 3-
633.)
If, for some reason, the transfer belt home position sensor fails to detect the home position of the transfer
belt, 'E070' will be indicated on the control panel.
The seam detection sticker on the transfer belt is put on the back of the transfer belt (at the rear).
Transfer belt motor
M14
Drive roller
COPYRIGHT © 2001 CANON INC.
Transfer belt
Figure 3-633
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
3. OPERATION AND TIMING
Seal detection sticker
PS16
Transfer belt home position sensor
3-163