Fixing Drive Assembly - Canon NP6251 Service Manual

B. Fixing Drive Assembly
If a jam occurs in the fixing/delivery assembly, the DC controller PCB generates the
fixing drive stop signal to turn on the fixing drive stop solenoid (SL3), thereby
immediately stopping the fixing roller.
The cleaning belt used to clean the upper fixing roller is taken up by the cleaning belt
take-up arm moving up and down in response to the activation of the fixing cleaning belt
solenoid (SL14).
The area where the fixing roller comes into contact with the cleaning belt guide is
made rather large so as to prevent offset.
The height of the fixing assembly inlet guide is varied by turning on and off the fixing
assembly inlet guide drive solenoid (SL16) so as to facilitate feeding of copy paper.
The height is varied according to the following conditions, and the change is made
with reference to a height of about 130 mm (at start of copying and upon end of rotation):
• High if the copy paper is B5R or longer (including B5R).
• Low if the copy paper is shorter than the above.
However, if 'free size' is selected for the multifeeder, the control will be as follows:
• High at the start of copying.
When the first copy paper moves past the registration paper sensor (PS23), its
length is measured and the above control is executed.
COPYRIGHT © 1997 CANON INC.
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CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 6 FIXING SYSTEM
6-3