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FIXING UNIT CF5001 Ver.1.0 Sep. 2003
2-64
II UNIT EXPLANATION
12.2.3 Web control
The web motor (M54) is driven for a specified period of time for each print to clean the fixing roller /U
through the cleaning roller.
The operation of M54 starts at the same time as the registration roller motor (M30). In order to make web
travel distance even on the cleaning roller, the ON time of M54 is determined by the accumulated M54
drive time.
12.2.4 Temperature control
The fixing roller /U is heated by the fixing upper lamp /1 (L2) and the fixing upper lamp /2 (L3). The fixing
roller /L heated by the fixing lower lamp /2 (L4). L2 and L3 are connected in parallel and they turn on and
off at the same time.
the fixing temperature sensor /1 (TH1) and the fixing temperature sensor /3 (TH3) detect the temperature
of the fixing roller /U and control it by turning on and off L2 and L3 through the AC drive board (ACDB) so
that it is held at the specified temperature.
In the same way, the fixing temperature sensor /2 (TH2) and the fixing temperature sensor /4 (TH4) detect
the temperature of the fixing roller /L to turn on and off L4.
A. Warm-up
The moment the main switch (SW2) turns on, the lighting circuits of the fixing upper lamps 1/ and /2 (L2,
L3) and the fixing lower lamp /2 (L4) inside the AC drive board (ACDB) turn on. L2, L3 and L4 are kept on
until a specified temperature is obtained.
After completion of warming-up, the printer control board (PRCB) controls the L2, L3 and L4 so that the set
temperature is maintained while in idling. At this time, L2, L3, and L4 are not turned on simultaneously.
Warm-up time: 420 sec. or less in Metric/390 sec. or less in Inch (at room temperature of 20 °C)
B. Protection against abnormality
Thermostats are employed to protect the fixing roller against its abnormal temperature rise. The fixing
roller /U is provided with thermostat /1 (TS1) and the fixing roller /L is provided with thermostat /2 (TS2)
respectively.
When TS1 detects an abnormal temperature, the flow of electricity to the fixing upper lamp /1 (L2) and the
fixing upper lamp /2 (L3) is shut off at the same time.
And when TS2 detects an abnormal temperature, the flow of electricity to the fixing lower lamp /2 (L4) is
shut off.