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 1-13 Low-voltage power supply (LVPS) 20 Chapter 1 Theory of operation ENWW Engine controller unit Low-volt age power supply Fuse(FU1001) Fuser control Noise filter Fuser circuit Fuse(FU1002) Power-switch control circuit Noise filter Power switch (SW240) High-voltage power supply /FDOORSNS +24R +24V +24V generation circuit REM24 Door switch (SW501) +3.3V +3.3V generation circuit DC controller +24U Protection circuit +3.3V +5V generation +5V circuit Low-volt age power supply Fuse(FU1001) Fuser control Noise filter circuit Fuse(FU1002) Noise filter /FDOORSNS +24V +24V generation circuit REM24 +3.3V +3.3V generation circuit DC controller Protection circuit +5V generation circuit /FDOORSNS Door switch (SW501) +24U +3.3V +5V DC controller Noise filter N oise fil ter