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Low-voltage power supply
The low-voltage power-supply circuit converts the AC power from the wall receptacle into the DC voltage
that the product components use. The product has two low-voltage power-supplies for 110 Volt or 220
Volt input.
Figure 1-5 Low-voltage power-supply circuit
+3.3V
24RMT
+24VA
+12VA
SW1
+5VC
+24VB
SW2
PWROFF
PWRSWON
ZEROX
PSTYP100
+3.3VS
+5VB
ICB
Fuse
Formatter
+3.3V
generation
circuit
Power switch
Remote switch
control circuit
+24V
generation
circuit
+5V
generation
circuit
Protection circuit
Rectifying
circuit
Zerocross
circuit
Low-voltage power supply
AC input
Fuse
Noise filter
Noise filter
Rectifying
circuit
+12V
generation
circuit
Protection circuit
Switching
circuit
DC controller
Fuser control
circuit
The low-voltage power supply converts the AC power into three DC voltages, which it then subdivides,
as described in the following table.
Table 1-8 Converted DC voltages
Main DC voltage Sub-voltage Behavior
+24 V +24 VA Constantly supplied
12 Chapter 1 Theory of operation ENWW