Component Designator Description
Switch SW501 Cartridge-door switch
SW502 Power switch
Fuser-control circuit
The fuser-control circuit monitors and controls the temperature in the fuser. The product uses on-
demand fusing. The fuser-control circuit consists of the following major components:
●
Fuser heater (H1); heats the fusing film
●
Thermistor (TH1); detects the fuser temperature (contact type)
●
Thermal fuse (FU1); prevents abnormal temperature rise in the fuser (contact type)
Figure 1-8 Fuser control circuit
Fuser heater safety
circuit
TH1
FU1
H1
DC controller
Fuser heater control
circuit
Engine controller
FUSER TEMPERATURE signal
FUSER HEATER CONTROL signal
Pressure roller
Fuser film
Fuser control
Table 1-6 DC controller controlled components (continued)
12 Chapter 1 Theory of operation ENWW
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