Temperature Control In Response To Change Of Paper Size - Canon iR4570 Series Service Manual

The second side of an automatic double-sided copy requires lower control temperature in comparison with the first
side. For this reason, the control temperature is lowered for the second side of an automatic double-sided copy so as
to prevent adverse effects such as rises in temperature.

9.3.2.7 Temperature Control in Response to Change of Paper Size

iR2270 / iR2870 / iR3570 / iR4570 / iR3530
The machine has a function to switch the paper size during continuous mode such as in rotation sort. When small-
size paper is qenerated continuously, the temperature of the end portion of the fixing film rises. Immediately
thereafter, if large-size paper is passed, high-temperature offset might occur at the end portion where the temperature
is likely to have risen. To prevent high-temperature offset, the control temperature is changed when the paper size
chanqes.
9.3.3 Cleaning
9.3.3.1 Fixing Film Cleaning
iR2270 / iR2870 / iR3570 / iR4570 / iR3530
Purpose
In the event of a jam or when wear on the fixing film advances, the fixing film is rotated idly for collection of toner
from both the film and the pressure roller to the cleaning roller.
The timing of control is as follows:
1. If the reading of the cleaning counter has exceeded the interval (expressed in terms of the number of sheets), the
machine starts cleaning with the fixing motor rotating at 1/4 speed. The length, timing, and intervals of cleaning
may be set in service mode: COPIER>OPTION>BODY>FIX-CLN. Further, the cleaning counter reading is reset
at the end of cleaning.
COPIER > OPTION > BODY > FIX-CLN
Cleaning control
temperature
Cleaning control time
Cleaning intervals
If a copy or print job arrives while cleaning is under way, the machine will not pick up paper until the ongoing
cleaning ends.
If last rotation is under way in response to a rise in temperature at the film edge, the machine will hold cleaning until
T-9-2
0 (default) 1
0 225
0 60
0 500
2 3
225 225
60 60
200 100
Chapter 9
0007-5454
0007-5300
9-7