●
Control fuser temperature
●
Detect fuser failures
●
Prevent excessive temperature rise
●
Detect remaining life in the fuser
●
Determine if the correct fuser is installed
Fuser circuits
The fuser heater control circuit and the fuser heater safety circuit control the fuser temperature according to
commands from the DC controller. The fuser consists of the following major components:
Figure 1-6 Fuser components
FUSER TEMPERATURE signal
FUSER HEATER CONTROL signal
DC controllerLow-voltage power supply
TH1
TP
H1, H2
Pressure roller
Fuser film
Fuser heater
control circuit
Fuser heater
safety circuit
TH3
TH2
Table 1-13 Fuser components
Type of component Abbreviation Name Function
Heaters H1, H2 Fuser heaters Heats the center of the fuser lm
assembly
Thermistors
(Contact type)
TH1 Main thermistor Detects the center temperature of
the fuser heater
ENWW Engine-control system 15
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