HP LaserJet 3100 and 3150 Series printer

The AC, DC, and high-voltage power supply circuits are all contained within the ECU.

AC power distribution

The AC power circuitry supplies AC voltage whenever the power cord is connected to the AC power source. The AC voltage is distributed to the DC power supply circuitry and to the AC driver circuitry, which controls AC voltage to the fusing assembly's heating element.

DC power distribution

The DC power distribution circuitry, located on the ECU, distributes +5 VDC and +12 VDC as follows:

3

+5 VDC:

Formatter

 

Photosensors

 

DC-controller circuitry

 

Laser/beam-detect circuitry

+12 VDC:

Motor

 

Scanner motor

 

Solenoid

+12VADC:

High-voltage power supply

 

 

EN

AC and DC power distribution 133