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31 December 1992
10.4 TEMPERATURE CONTROL
Hot Roller
Temp. (°C)
200
195
190
185
180
175
170
165
160
155
75 80
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. Service program #28 shifts the
temperature in 1 degree increments (–4°C to +5°C). Service progtam #29
shifts the temperature in 2 degree increments (–8°C to +10°C). The fusing
temperature can be monitored using service program #32.
NORMAL
LOW
85
90
95
Pressure Roller Temp. (°C)
2-45
FUSING AND PAPER EXIT
HIGH
100
105
110
115
Operating
temp. (Low)
Lower Limit
(Low)
120
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