1-36 Service Manual
4023-001
Fusing Section
Fusing
Toner-transferred paper feeds from the transfer section to the fusing
section when power from the transport motor (M2) transmits to the
upper fusing roller.
The fusing roller heater lamp (H1, built in the roller) heats the upper
fusing roller. The fusing roller thermistor (TH1) attached to the upper
fusing roller controls the heater temperature. To ensure overheating
does not occur, the fusing roller thermostat (TS1) and fusing roller
heater lamp fuse (TF1) are connected in series to the heater lamp
(H1). The heater lamp (H1) heats when an AC voltage is applied.
Temperature Control Using The Thermistor
The resistance of the thermistor (TH1) attached to the upper fusing
roller varies with temperatures. When temperature rises, the
resistance of the thermistor (TH1) decreases, and vice versa.
Thermostat (TS1) and Heater Lamp Fuse (TF1)
If an abnormal current flows into the heater lamp because of
thermistor trouble and the upper fusing roller temperature reaches
1 Separator 5 Upper Fusing Roller
2 Thermostat (TS1) 6 Paper
3 Thermistor (TH1) 7 Lower Fusing Roller
4 Heater Lamp (H1) 8 Guide
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