Canon imageRUNNER 2545 Series Service Manual page 50

2
Technology > Controller System > Controls > Fan
Overview
When paper narrower than the A4 width (297 mm) is fed, the air outlet of the paper edge
cooling fan (rear)/(front) opens to blow air to both ends of the fixing film, thus cooling the
sections where paper is not fed.
When paper wider than the A4 width (297 mm) is fed, the air outlet of the paper edge cooling
fan (rear)/(front) closes to cool the paper that has passed through the fixing unit.
Control sequence
1) The shutter motor (M8) is driven and the home position of the edge cooling shutter is
detected with the shutter HP sensor (S10).
2) The opening width of the edge cooling shutter is determined according to the paper size.
3) After completion of adjustment of the paper feed temperature for the first sheet, the paper
edge cooling fans (rear)/(front)(FAN1/FAN2) start operating intermittently every second.
* The opening width of the shutter is changed, the rotational speed is increased to the full
speed, or the fans are stopped according to the difference in temperature between sub
thermistors TH1 and TH2.
4) When the width of the last paper is narrower than the A4 size (297 mm), the fans stop
when the difference in temperature between sub thermistors TH1 and TH2 becomes 20
degree or more.
When the width of the last paper is wider than the A4 size (297 mm), the fans stop after
operating for 10 seconds after completion of printing.
2 Technology > Controller System > Controls > Fan
Shutter (rear)
Film unit
Shutter HP
sensor (S10)
FAN1
FAN2
2-24
Shutter motor (M8)
Shutter (front)
F-2-44
2-24