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HP (Hewlett-Packard) CF081A#BGJ Benutzerhandbuch

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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
+3.3VA
Protection circuit
24VRMT
Low-voltage power supply
AC input
Noise filter
Fuse
DC controller
Fixing control
circuit
Rectifying
circuit
+24V
generation
circuit
+24VA
+5VA
SW2
+5VC
SW1
+24VB
SW3
Protection circuit
/ZEROX
PSTYP100
+3.3VC
Rectifying
circuit
+5V
generation
circuit
+3.3V
generation
circuit
Fuse
PWRSWON
VC5VOFF
Formatter
ICB
+5VD
+5VB
+3.3VB
+3.3VA
+5VB
VC3VOFF
PWRSAVE
Noise filter
+24VB
Switch
Switch
Switch
Switch
Switch
Zero crossing
circuit
Power switch
The low voltage power supply converts the AC power into three DC voltages, which it then subdivides,
as described in the following table.
12
Chapter 1   Theory of operation
ENWW