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10.4 TEMPERATURE CONTROL
Hot
Roller
Temp.
195
190
185
180
175
170
165
160
The main board monitors the temperature of the hot roller through TH1 and
the temperature of the pressure roller through TH2. The CPU determines
whether or not to turn on the fusing lamp based on the combination of the
input from these two thermistors. If the pressure roller is cool, the CPU keeps
the hot roller temperature high. However, if the pressure roller is hot, the CPU
decreases the operating temperature of the hot roller. The above graph
shows the relationship between the temperatures of the hot and pressure
rollers.
The operating temperature of the hot roller and pressure roller can be
adjusted using service programs #28 and #29. These programs are used to
compensate for variations in the response of different thermistors. Service
program #28 adjusts the hot roller temperature and service program #29
adjusts the pressure roller temperature. Both of these service programs shift
the temperature in 2 degree increments. The maximum change is 10 degrees
or --8 degrees. The fusing temperature can be monitored using service
program #32.
Also. the setting for fusing warm-up cycle (after main switch on) can be
adjusted using service program mode #14 to off or from one to three minutes,
in one minute increments.
o
10
SP #28
o
8
75
80
85
90
Pressure Roller Temp.
SP #29
o
o
8
10
95
100
105
2-43
6 January 1990
120
110
115
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