3. Detecting the Remaining Length of the
Cleaning Belt
The remaining length of the cleaning belt is
identified mechanically by the cleaning belt
detecting lever (Figure 3-435) in reference to two
notches in the belt.
When the cleaning belt detecting lever comes to the
notches, a warning is indicated on the control panel.
Figure 3-435 shows the spatial relationship
between the cleaning belt detecting lever and
sensors when the lever detects the short notch
and the long notch.
3. OPERATIONS AND TIMING
COPYRIGHT © 1996 CANON INC.
CANON NP6085 REV.0 JULY 1996 PRINTED IN JAPAN (IMPRIME AU JAPON)
3-121
Q9
OFF
OFF
ON
Q8
OFF
ON
OFF
Display on control
panel
Indicates a warning
when SW921 on
the jam indicator
PCB is pressed (in
service mode); im-
mediately after de-
tection, the length
is about 5600 mm,
equivalent of about
100,000 copies.
E005
Cleaning belt detecting lever
Cleaning belt
Upper fixing roller
Q9
Q8
Q9
Q8
Q9
Q8
Photointerrupter
After detecting short notch
Before detection
After detecting long notch
Figure 3-435
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