Minolta PagePro 1200 Series Service Manual Page 55

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PagePro 1200 Series Mechanical / Electrical
55
(1) Overview
The toner image transferred onto the paper is securely fixed to the paper.
A heat roller system is used as the fusing system. The toner image is fused by the Heat Roller
heated by the Heater Lamp, and securely fixed by the pressure between the Heat Roller and
Backup Roller.
(2) Fusing Temperature Control Circuit
The Thermistor detects the surface temperature of the Heat Roller and inputs that analog voltage
into IC1. Corresponding to this data, the Heater 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 Heater Lamp is not turned OFF even if the Thermistor detects a high temperature mal-
function (if the surface temperature of the Heat Roller exceeds 230
°
C), the signal from IC1-79
changes from L to H to turn OFF the Heater Lamp forcibly.
4127s025
Paper
Paper Separator
Thermostat (TS1)
Thermistor (TH1)
Heater Lamp (H1)
Backup Roller
Fusing Entrance Guide
Heat Roller
1
2
1
2
PJ2
2
1
TH1
1
2
CN1
H1
TS1
PU1
DC5V
78
IC1
PWB-P
3
2
1
DT1
GND
DC5V
IC2
79
55
CMPOUT
P01
CMPIN/AN8/P63
GND
GND
H1: ON
H1: OFF
L
H
H
L
L
L
1
2
3
PJ7
4
5
1
2
3
4
5
CN2
6
7
6
7
+24V
GND
GND
GND
FUSER_LAMP
+5V
+5V
N.C.
HEAT_N
HEAT_L
3
4121s037
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