Fuser temperature control
The fuser temperature control detects the temperature of the fuser heater surface, and then controls the
FUSER HEATER DRIVE (FSRD1) signal to the fuser heater until the fuser heater temperature reaches the
target temperature.
The DC controller controls the FSRD1 signal by monitoring the detected fuser heater temperature—using
the thermistor (TH3)—and then holds the heater at the target temperature.
Figure 1-11 Fuser temperature control
JP1001
100V: Open
200V: Close
Relay
(RL101)
Fuser heater
drive circuit
Relay
(RL102)
Zero crossing
circuit
Fuser control
AC input
DC controller
Current
detection circuit
Fuser heater
safety circuit
H1
TH1
TH2
TP1
J128
Q704
+3.3V
/HITMP
FSRTH1
FSRD1
FSRTH2
/FSRARI
/AC200
CPU
/RLD
/ZEROX
CURRMS
FSRSAFE
TB10
TB11
2
1
+24VC
16 Chapter 1 Theory of operation ENWW
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