A SERVICE OF

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