Low-voltage power supply

The low-voltage power supply (LVPS) converts ac input voltage to dc voltage. The LVPS has two fuses on the PCA. The LVPS 24 V output is interrupted to the fuser and the high-voltage power supply if the cartridge-door interlock switch (SW501) is in the off position (cover open).

WARNING! The product power switch only interrupts dc voltage from the LVPS. The ac voltage is present in the product when the power cord is plugged into a power receptacle and the power switch is in the off position. You must unplug the product power cord before servicing the product.

Figure 1-13Low-voltage power supply (LVPS)

 

 

Engine controller unit

 

 

Low-volt age power supply

 

 

Fuse(FU1001)

 

 

 

Noise filter

Fuser control

Fuser

 

circuit

 

 

 

Fuse(FU1002)

 

 

Power-switch

 

 

control circuit

 

 

 

Noise filter

 

 

Power switch

 

 

 

 

 

 

(SW240)

 

 

 

High-voltage

 

 

/FDOORSNS

power supply

 

 

 

 

 

 

+24R

 

+24V

 

 

+24V generation

 

 

circuit

REM24

 

Door switch

 

 

 

(SW501)

 

+3.3V generation

+3.3V

 

 

 

 

 

circuit

DC controller

+24U

Protection

 

 

 

 

 

 

circuit

 

 

+3.3V

 

+5V generation

 

+5V

 

circuit

 

 

 

 

20 Chapter 1 Theory of operation

ENWW