Fusing Temperature Control - Konica Minolta BizHub C360 Service Manual

20. FUSING SECTION
20.3.6

Fusing temperature control

• Fusing temperature control uses a noncontact type thermistor to detect the temperature
of the fusing roller and fusing pressure roller and thereby controls to turn ON the fusing
heater lamp for controlling the fusing temperature.
A. Fusing heater lamp
(1) Heating roller
• The heating roller contains a fusing heater lamp in it. The fusing heater lamp turns ON to
generate heat, which heats the heating roller and fusing belt. The lamp turns OFF to stop
heating. (The temperature of the heating roller and fusing belt decreases.)
• The fusing heater lamp consists of two heaters, each having a unique characteristic dif-
ferent from each other. One is called the "long" heater that uniformly heats the entire
area of the heating roller and the other is called the "short" heater that heats only the
central portion of the heating roller.
• The "long" and "short" heaters are used differently depending on the temperature condi-
tion of the heating roller. To be more specific, the "short" heater may typically be used in
the following condition: when a multi-print cycle using a large volume of small sized
paper is run, the temperature of the heating roller at its central portion can at times be
decreased. In such conditions, the "short" heater is turned ON to heat the central portion
of the heating roller to a temperature appropriate for printing. The temperature of the
ends of the heating roller which are not heated decreases, which corrects uneven tem-
perature of the roller.
Heating roller
thermister/S
Heating roller
thermister/M
216
fusing pressure roller
thermostat (TS2)
Heating roller
thermister/C
Heating roller Fusing heater lamp (long)
Theory of Operation Ver. 1.0 Jul. 2009
Heating roller thermostat
(TS1)
Heating roller thermister
Pressure roller fusing
heater lamp
Heating roller Fusing heater lamp (short)
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