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5.4 Reducing the Copying Speed
5.4.1 Outline
The machine is not equipped with a paper width detection mechanism; for this reason, if
paper with a limited width is used in continuous printing, the ends of the fixing heater
would overheat. To prevent overheating, the machine switches among 3 copying speeds with
reference to the readings of the sub thermistor.
1. Normally, the machine reduces the speed to 4 ppm when the reading of the sub ther-
mistor reaches 245°C/473°F or higher.
2. The machine will further reduce the copying speed to 3 ppm if the reading of the sub
thermistor reaches 255°C/491°F or higher after it has reduced it to 4 ppm.
3. The machine will further reduce the copying speed to 2 ppm if the reading of the sub
thermistor reaches 260°C/500°F or higher after it has reduced it to 3 ppm.
COPYRIGHT © 2001 CANON INC.
2000 2000 2000 2000
CANON SmartBase PC1200s/iR1200s REV. 0 DEC. 2001
CHAPTER 4 OPERATION
4-23
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Troubleshooting
