3-7.Fusing; 3-7-1.An Overview; 3-7-2.Fusing Temperature Control Circuit - Minolta QMS PageWorks/Pro 1100 Service Manual

3-7. Fusing
3-7-1. An 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.
Paper Separator
Thermostat (TS1)
Thermistor (TH1)
Heater Lamp (H1)
Heat Roller
3-7-2. Fusing Temperature Control Circuit
- The Thermistor (TH1) detects the surface temperature of the Upper Fusing
Roller and inputs that analog voltage into IC1A-78. Corresponding to this
data, the Heater Lamp ON/OFF signal is output from IC1A-55, causing the
Heater Lamp (H1) 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 malfunction (if the surface temperature of the Upper Fusing
Roller exceeds 210°C), the signal from IC1A-79 changes from L to H to turn
OFF the Heater Lamp forcibly.
H1
TS1
4121s37
1
TH1
2
PU1
CN2
+24V 1
GND 2
GND 3
+5V 4
CN1
SLEEP_MODE 5
1
HEAT_N
24V_MON 6
2 N.C.
7
FUSER_LAMP
3 HEAT_L
L H1: ON
H
H1: OFF
40
Paper
Backup Roller
Fusing Entrance Guide
4121s036
PWB-P
PJ2
1
1
2
2 DC5V
GND
PJ7
1
2
3
4
5
6
DT1
L
IC2
7
H
1
DC5V
GND
78
CMPIN/AN8/P63
GND
IC1
L
79
3
CMPOUT
L
2 55
P01