Canon NP6012 Service Manual page 101

OPERATIONS AND GN
7. Correcting Displacement of the Fixing
Film
a. Outline
The fixing film can become displaced
toward the front or the rear as it keeps mov-
ing. To correct such displacement, the copier
is equipped with a correction mechanism.
The fixing film displacement Correction
mechanism consists of the following four
parts:
* tension roller
* swing arm
* tension wire
* balance spring
Displacement, if any, of the fixing film is
corrected by moving the front side of the ten-
sion roller up and down by the balance
Swing arm Tension wire
Balance spring
spring and the wire. When the fixing film has
become displaced toward the front, the copi-
er lowers the front of the tension roller; when
the fixing film has become displaced toward
the rear, the copier moves up the front of the
tension roller.
The tension roller is designed to stop
where the fixing film can move without dis-
placement by the work of the balance spring
and the wire.
lf the fixing film becomes displaced
toward the rear or the front in excess of the
range within which displacement is correct-
ed, the fixing film displacement sensor (PS4)
turns on. When the sensor (PS4) turns on,
the fixing film is stopped and an error code
(EO and 07 alternately flashed) is indicated
on the control panel.
DC controller
PCB
Tension roller
Figure 3-412
3-56 COPYRIGHT © 1995 CANON INC,