Fusing Temperature Control - Epson AcuLaser Color 2000 Service Manual

EPSON AcuLaser C2000

2.2.8.2 Fusing Temperature Control

Control Circuit
Thermistor 1 (TH1) detects the surface temperature of the heat roller and
inputs temperature signal to CPU. Heater lamp (H1) turns on/
off according to the heater on/off signal, which is conveyed in the form of
Pout signal output according to the thermistor 1 detected temperature.
The surface temperature of the pressure roller is adjusted by the
heater lamp (H2) and thermistor 2.
Even when the thermistor detects the abnormal high temperature (the
surface temperature of the roller exceeded 210
not turned OFF, the printer turns off the relay of PU1 and turns the
heater lamp OFF compulsory.
Table 1-1. Heater Lamp On/OFF Signal
L Heater ON
H Heater OFF
Operating Principles
C), if the Pout signal is
°
Printing Process
CPU
DC5V
-
+
H H
H
POUT
H
Heater ON/OFF
L Heater ON
L Heater ON
Figure 2-31. Fusing Temperature Control
Revision C
Thermistor 1
PJ4D
TH 1
DC5V 2
1
DC5V
1
2
PJ5D TH 2
Thermistor 2
Thermostat Heater Lamp
H1
TS1
C N95
PU1
1
PJ4A PJ5P
1
1 2
L
2
0
3
3
9
4
8
Signal 1
86