HP LaserJet Enterprise M552 - Low-voltage power supply

Low-voltage power supply
The low-voltage power-supply (LVPS) circuit converts the AC power from the wall receptacle into the DC
voltage that the printer components use.
Figure 1-5 Low-voltage power-supply circuit
+3.3VA
+5VB
VC5VOFF
PWRSAVE
+24VB
ZEROX
+5VA
+24VA
+3.3VA
+3.3VC
24VRMT
+3.3VC
+3.3VD
POWER_SW
+5VA
FET
FET
FET
+3.3VB
+5VC
FET
+3.3VB2
AC input
Low-voltage power supply
DC controller
Fuse
FU100
Interlock switch
SW1
Rectifying
circuit
Zerocross
circuit
+3.3V
generation
circuit
+24V
generation
circuit
+5V
generation
circuit
Fuser
Power switch
SW4
Rectifying
circuit
Protection
circuit
Fuse
FU101
Fuser power supply
Protection
circuit
Switching
circuit
Formatter
18 Chapter 1 Theory of operation ENWW