20-4.Fusing Temperature Control - Minolta Di450 Service Manual

20-4. Fusing Temperature Control
• The Fusing Roller Heater Lamp is turned ON and OFF to keep a set temperature on the
surface of the Fusing Roller.
• The Fusing Roller surface temperature is detected by using a thermistor that translates
the temperature to a corresponding electrical signal.
• If the Fusing Roller temperature becomes excessively high, the Fusing Roller Heater
Lamp is shut down.
• The Lower Fusing Roller Heater Lamp is not turned ON during a copy cycle. During a
warm-up cycle, both the Upper and Lower Fusing Roller Heater Lamps can be turned
ON at the same time.
• The temperature for fusing temperature control can be selected from among three
options (180, 190, and 200 °C) by using a Tech. Rep. Choice function.
Part Name Symbol
Upper Fusing Roller
H1
Heater Lamp
Lower Fusing Roller
H2
Heater Lamp
Upper Fusing Roller
TS1
Thermostat
Upper Fusing Roller
TH1
Thermistor
Lower Fusing Roller
TH2
Thermistor
Power Switch ON
Warm-Up
(°C)
190
A
140
B
0
7
A: 45 sheet Copier-160 °C, 55 sheet Copier-175 °C
B: 45 sheet Copier-50 °C, 55 sheet Copier-85 °C
ON during a warm-up cycle, standby state, or a copy
cycle.
ON during a warm-up cycle or standby state.
Detects the surface temperature of the Fusing Roller
becomes inordinately high
Detects the surface temperature of the Upper Fusing
Roller.
Detects the surface temperature of the Lower Fusing
Roller.
Start key ON
Copy Cycle
Stand by
Stand by
13
M-73
Function
Energy
Saver
Stand by
(minute)
Control
Temperature
-
-
230 °C
190 °C
140 °C
Upper Fusing
Roller Surface
Temperature
Lower Fusing
Roller Surface
Temperature
4002M571AA