31
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.
+5V
C402
R418
Thermistor
Thermistor
+5V
+
-
R417
R416
R415
IC401
C418
+5V
+
-
R441
R440
R442
IC401
R439
+5V
+5V
+5V
+5V
PC101
R104
5
6
PC101
R104
5
6
+5V
+5V
+5V
R448
IC404
IC404
Q407
Q413
R450
R451
Q408
Q414
IC101
(LPC PCB)
(HTC 1 PCB)
(HTC 2 PCB)
Fuser Temperature Control Circuit
CN765
CN765
CN708
8
9
CN732
3
4
CN716
1
2
3
4
VTH
V+
VTH
V+
R449
R419
7
6
5
1
2
3
Summary of Contents for DP-3000
Page 2: ...The contents of this Technical Guide are subject to change without notice Published in Japan...
Page 148: ...148 2 27 EP PC Board Drawing Name EP PC Board 1 8 Model DP 2000 2500 3000...
Page 149: ...149 Drawing Name EP PC Board 2 8 Model DP 2000 2500 3000...
Page 150: ...150 Drawing Name EP PC Board 3 8 Model DP 2000 2500 3000...
Page 151: ...151 Drawing Name EP PC Board 4 8 Model DP 2000 2500 3000...
Page 152: ...152 Drawing Name EP PC Board 5 8 Model DP 2000 2500 3000...
Page 153: ...153 Drawing Name EP PC Board 6 8 Model DP 2000 2500 3000...
Page 154: ...154 Drawing Name EP PC Board 7 8 Model DP 2000 2500 3000...
Page 155: ...155 Drawing Name EP PC Board 8 8 Model DP 2000 2500 3000...
Page 156: ...156 2 28 G3B PC Board Drawing Name G3B PC Board 1 10 Model DP 2000 2500 3000...
Page 157: ...157 Drawing Name G3B PC Board 2 10 Model DP 2000 2500 3000...
Page 158: ...158 Drawing Name G3B PC Board 3 10 Model DP 2000 2500 3000...
Page 159: ...159 Drawing Name G3B PC Board 4 10 Model DP 2000 2500 3000...
Page 160: ...160 Drawing Name G3B PC Board 5 10 Model DP 2000 2500 3000...
Page 161: ...161 Drawing Name G3B PC Board 6 10 Model DP 2000 2500 3000...
Page 163: ...163 Drawing Name G3B PC Board 8 10 Model DP 2000 2500 3000...
Page 164: ...164 Drawing Name G3B PC Board 9 10 Model DP 2000 2500 3000 LCU LCE PCB LCU LCE PCB...
Page 165: ...165 Drawing Name G3B PC Board 10 10 Model DP 2000 2500 3000 To SC PCB...
Page 166: ...166 2 29 FRM PC Board Drawing Name FRM PC Board 1 1 Model DP 2000 2500 3000...
Page 177: ...177 2 31 LANC PC Board Drawing Name LANC PC Board 1 1 Model DP 2000 2500 3000...
Page 185: ...185 2 38 MAIN LVPS PC Board 100V MAIN LVPS PC Board 100V Drawing Name Model DP 2000 2500 3000...
Page 186: ...186 2 39 MAIN LVPS PC Board 200V MAIN LVPS PC Board 200V Drawing Name Model DP 2000 2500 3000...
Page 191: ...191 Drawing Name Finisher Controller PC Board 2 11 Model DP 2000 2500 3000...
Page 192: ...192 Drawing Name Finisher Controller PC Board 3 11 Model DP 2000 2500 3000...
Page 193: ...193 Drawing Name Finisher Controller PC Board 4 11 Model DP 2000 2500 3000...
Page 194: ...194 Drawing Name Finisher Controller PC Board 5 11 Model DP 2000 2500 3000...
Page 195: ...195 Drawing Name Finisher Controller PC Board 6 11 Model DP 2000 2500 3000...
Page 196: ...196 Drawing Name Finisher Controller PC Board 7 11 Model DP 2000 2500 3000...
Page 197: ...197 Drawing Name Finisher Controller PC Board 8 11 Model DP 2000 2500 3000...
Page 198: ...198 Drawing Name Finisher Controller PC Board 9 11 Model DP 2000 2500 3000...
Page 199: ...199 Drawing Name Finisher Controller PC Board 10 11 Model DP 2000 2500 3000...
Page 200: ...200 Drawing Name Finisher Controller PC Board 11 11 Model DP 2000 2500 3000...
Page 342: ...DZZSM00171 0...