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Heater
Control
Thermal
Fuse
Lamp
H1TH1
AC IN
21
L
N
L
N
Power
Switch
(SW1)
Noise
Filter
Rectfier
Inlet
Transformer
Rectfier
Chopper
Over
Voltage
Detector
Feedback Control
1
4
2
3
6
7
5
8
HEAT/
+24V
+5V
+5V
±0V
±0V
+24VRET
FANLOCK/
P3
To Heater Circuit
F101
F102
P1
Figure 3.9 Low-Voltage Power Supply PCB Block Diagram