Panasonic DP-1510P Technical Manual page 23

5. Fuser Temperature Control Circuit
The fuser temperature is controlled by IC1 on the LPC3 PC Board, which contains A/D (Analog/Digital)
converters. IC1 adjusts temperature, observing Thermistor and voltages separated by R61 with A/D
converters. When the PC101 drive current is transmitted from the LPC3 PC Board to the HTC PCB,
the Fuser Lamp turns ON. IC5 is a converter with open output at pins 1 and 7 and is used as an
abnormal temperature detection circuit. IC5, pin 1 and 7, has a high impedance when Q7 and Q8 are
activated, turning ON the Fuser Lamp. An abnormal temperature is detected when the VTH voltage
level becomes lower than V-, forcing IC5, pin 1 and 7 Low and deactivating Q8.
Abnormally low and high temperatures, as well as Thermistor release status, are detected by IC1
(CPU) programming.
nSSRA
IC1
(Fuser)
Thermistor
Edition 1.0
+5V
L: ON
H: OFF
+5V
Q24
VTH
R61
+5V
CN708
+5V
+5V
Q23
Q3
Fuser Temperature Control Circuit
+5V
R25
Q7
GND
IC5
uPC393
V-
+5V
THERM
(A/D)
23
(HTC PCB)
+5V
PC101
Q8
IC1
DP-1510P/1810P
/1810F/2010E
JUL 2002