Gp 15 Fusing; Fusing Temperature Control Circuit - Xerox FaxCentre F116 Service Manual

GP 15 Fusing

Overview
• A heat roller system is used as the fusing system. The toner image is fused by the Fuser Roll
heated by the Fuser Lamp, and securely fixed by the pressure between the Fuser Roll and
Pressure Roll.
• The toner image transferred onto the paper is securely fixed to the paper.
Thermostat (TS1)
Thermistor (TH1)

Fusing Temperature Control Circuit

• The Thermistor detects the surface temperature of the Fuser Roll and inputs that analog volt-
age into IC1A-78. Corresponding to this data, the Fuser Lamp ON/OFF signal is output from
IC1A-55, causing the Heater Lamp to turn ON or OFF to control the fusing temperature.
• When the Fuser Lamp is not turned OFF even if the Thermistor detects a high temperature mal-
function (if the surface temperature of the Fuser Roll exceeds 230°C), the signal from IC1-79
changes from L to H to turn OFF the Fuser Lamp.
FaxCentre F116/F116L
Paper Separator
Fuser Lamp (H1)
Fuser Roll
PU1
CN1
H1
1
HEAT_N
2
N.C.
3 HEAT_L
TS1
Figure 1.
PJ2
1 1 1
TH1
2 2 2
PJ7
CN2
+24V 1 1
GND 2 2
GND 3 3
4 4
GND
+5V
5 5
+5V 6 6
L
7 7
FUSER_LAMP
GND
L H1: ON
H
H1: OFF
Figure 2.
9/04
General Procedures/Information
Paper
Pressure Roll
Fusing Entrance Guide
4127s025
PWB-A
78
CMPIN/AN8/P63
DC5V
GND GND
IC1
DT1
IC2
L
79
3
H CMPOUT
1
L
55
2
P01
DC5V
4121s037
6-47