Panasonic UF-585 Service Manual page 206

Panasonic UF-585 / 595
Fuser Temperature Control Circuit
The fuser temperature is controlled by IC1 on the LPC PC Board, which contains A/D (Analog/Digital) converters ANI0 and
ANI7. The Fuser Temperature Control Circuit uses A/D converter, ANI0. When thePC301 drive current is transmitted from the
LPC PC Board to the LVPS, the Fuser Lamp turns ON. IC4 is a conparator with open output at pins 1 and 7 and is used as an
abnormal temperature detection circuit. IC4, pin 1, has a high impedance when Q10 is activated, turning ON the Fuser Lamp.
An abnormal temperature is detected when the VTH voltage level becomes higher than V+, forcing IC4, 1, pin 1 Low and deac-
tivating Q10.
Abnormally low and high temperatures, as well as Thermistor release status, are detected by IC1 (CPU) programming.
CN
6
7
Thermistor
214
R89
pSSRA
+5v
+5v
GND
GND
GND
47
(ANI0)
IC1
CPU
Fuser Temperature Control Circuit Diagram
SCA (SCB)
PCB
CN67 CN15
CN6
9 9
10
3
2
Q10
1
GND
+24V
2 8
1
3
IC4.1
4
GND
pSSRA
LPC PCB
+24v
CN33
PC301
6
1
10
2
4
LVPS