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HP LaserJet Pro M201n - Page 32

HP LaserJet Pro M201n
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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 1-10 Fuser-heater control circuit
AC power supply
Engine controller
DC controller
Fuser control
Fuser
Pressure roller
Fuser film ass’y
FREQSNS
FSRTH
FSRD
Frequency detection
circuit
(220-240V only)
Fuser heater
control circuit
Fuser heater
safety circuit
Relay control
circuit
RL101
H1
FU1
TH1
RLYD
16 Chapter 1 Theory of operation ENWW

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