Panasonic DP-3000 Technical Manual page 31
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Also See for DP-3000:
- Operating instructions manual (199 pages) ,
- User manual (105 pages) ,
- Service manual (9 pages)
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5. Fuser Temperature Control Circuit
The fuser temperature is controlled by IC101 on the LPC PC Board, which contains A/D (Analog/
Digital) converters. IC101 adjusts temperature, observing two Thermistors and voltages separated by
R418 and R439 with A/D converters. When the PC101 drive current is transmitted from the LPC PC
Board to the HTC PCB, the Fuser Lamp turns ON. IC401 is a converter with open output at pins 1 and
7 and is used as an abnormal temperature detection circuit. IC401, pin 1 and 7, has a high impedance
when Q407 and Q413 are activated, turning ON the Fuser Lamp. An abnormal temperature is detected
when the VTH voltage level becomes higher than V+, forcing IC401, pin 1 and 7 Low and
deactivating Q407 and Q413.
Abnormally low and high temperatures, as well as Thermistor release status, are detected by IC101
(CPU) programming.
CN716
4
3
1
2
IC101
+5V
2
VTH
-
+5V
V+
+
3
R415
6
VTH
-
+5V
V+
+
5
R442
+5V
Q408
+5V
Q414
Fuser Temperature Control Circuit
(LPC PCB)
IC401
1
+5V
R448
IC401
7
+5V
IC404
Q407
+5V
IC404
Q413
31
CN765
+5V
PC101
9
R104
5
CN708
8
6
+5V
PC101
5
4
R104
CN732
3
6
CN765
(HTC 1 PCB)
(HTC 2 PCB)
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