Controlling The Fixing Film Temperature - Canon imageRUNNER 2270 Service Manual

[A]Paper feed direction
[B]Speed sensor output
[C]1 rotation of fixing film
Timing of Control
The speed of fixing film rotation is monitored at all times after the fixing motor goes on and
its speed reaches a specific value. The speed of the fixing motor is then controlled so that it
remains at a specific level at all times.

9.3.2 Controlling the Fixing Film Temperature

9.3.2.1 Controlling the Power Supply in Response to Low
Temperature
In a low temperature environment, the heater is supplied with power before the fixing film
is driven so as to soften the grease applied to the fixing film. The mechanism of control is
as follows:
If the temperature of the fixing film detected by the thermistor is lower than a specific level,
the heater is supplied with power for a specific period of time before a normal start-up
mechanism is initiated.
If the temperature of the fixing film detected by the thermistor is higher than a specific level,
the normal start-up mechanism is imitated.
9.3.2.2 Controlling the Feeding in Response to Low Temperature
In a low temperature environment, the feeding timing is changed according to the
temperature detected by the environment sensor so as to enhance the fixing capability. The
details are described below.
When the environment sensor detection temperature is 13 deg C or less, the feeding timing
is delayed by 5000 msec.
In thick paper mode, the feeding timing is not changed even if the environment sensor
detection temperature is 13 deg C or less.
Chapter 9
0007-5125
0007-5401
9-5