PRINTER
14 June, 2002
6-32
Fusing Temperature Control
Overview
T0: Room
temperature
T1:
Heater on full power until 170
°
C (No ON/OFF Temp. Control)
T2: Fusing
Temperature
1
*1
T3: Fusing
Temperature
2
*1
T4: Fusing
Temperature
3
*1
t1:
Time to shift from High to Lower Temperature 1
t2:
Time for Lower Temperature 2 (ON/OFF shift time)
*1: Differs according to paper size
At power on, the fusing lamp switches on and remains on until the thermistor in
contact with the hot roller detects the standby temperature (80
°
C).
When a print job starts, the fusing lamp remains on until the hot roller reaches the
print start temperature (T1). The print job starts at this temperature but the paper
stays at the registration roller until the thermistor detects the 1st fusing
temperature.
As shown in the illustration above, the fusing temperature is highest for the first
part of the job (t1). Then the temperature is gradually stepped down to prevent both
ends of the hot roller from overheating.
Example: For A4 paper, the heat at both ends of the hot roller does not
dissipate because these areas are not being used, allowing the ends to reach
a very high temperature. If the temperature was not corrected and if the next
job was on A3, the ends of the hot roller would be much hotter than the center,
and this could cause hot offset (double images).
T2
T1
T3
T4
T0
t1
t2
Standby
Startup
(without
Fusing Lamp
ON/OFF
Control
Startup (With
Fusing Lamp
ON/OFF
Control)
1st Fusing:
High Fusing
Temperature
ON/OFF Control
2nd Fusing:
Lower Fusing
Temperature 1
ON/OFF Control
3rd Fusing:
Lower Fusing
Temperature 2
ON/OFF Control
H310D908.WMF
