Service manual

COPYRIGHT © 1999 CANON INC. CANON GP160 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 1 INTRODUCTION
1-38
In this unit, the main image formation components; drum, toner, primary charging,
developing and drum cartridge are integrated in a cartridge system.
Furthermore, this unit employs the SURF fixing process; fluorocarbon coated film is
heated and the paper is passed between pressure rollers, thus being fixed by heat and
pressure.
This units image formation process is composed of the following steps.
Step 1 Primary charging (AC & negative DC)
Step 2 Laser emission
Step 3 Developing (AC & negative DC bias)
Step 4 Transfer (positive DC)
Step 5 Separation (negative DC)
Step 6 Re-charge eliminator (positive DC)
Step 7 Fixing
Step 8 Drum cleaning
Reference:
Regarding the Re-charge step
In the transfer charging step, the transfer toner image on the paper adheres due to a
positive charge from the back of the paper. This charge is weakened by the separa-
tion step, therefore the toner would scatter if moved in this state to the fixing step. In
order to prevent this, the Re-charge eliminator is located before the fixing step., and
positive DC bias is applied to the back of the paper.
Figure 1-703
Fixing film
Paper
DC bias
Re-charge eliminator
+ + + + + + + + +
+ + +
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