Fuser temperature control
The fuser temperature control maintains the temperature of the fuser heater at its targeted temperature.
The DC controller monitors the FIXING TEMPERATURE (FSRTH) signals and sends the FIXING
HEATER CONTROL (FSRD) signal according to the detected temperature. The fuser heater control
circuit controls the fuser heater depending on the signal so that the heater remains at the targeted
temperature.
Figure 1-9 Fuser-heater control circuit
FSRTH
DC controller
RLYD
FREQSNS
AC input
H1
TH1
FU1
Pressure roller
FSRD
RL101
Engine controller
Fuser film unit
Fuser heater
control circuit
Fuser heater
safety circuit
Fixing control
Fuser unit
Relay control
circuit
Frequency detection
circuit
(220-240V model only)
14 Chapter 1 Theory of operation ENWW
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