2HA/2HB
2-3-1
2-3 Operati on of the PWBs
2-3-1 Power source PWB
Figure 2-3-1 Power source PWB block diagram
The power source PWB (PSPWB) is a switching regulator that converts an AC input to generate 24 V DC and 5 V DC. It
includes a rectifier circuit, a switching regulator circuit, a 24 V DC output circuit, a 5 V DC output circuit, overvoltage detec-
tion circuit, zero-cross circuit and a fuser heater control circuit.
IL001
FG