Power system on the power-supply assembly
The power-supply assembly supplies the AC, DC, and high-voltage power-supply circuits.
AC power distribution
The AC power circuitry supplies AC voltage whenever the power cord is connected to the AC power
source and the power switch is on. The AC voltage is distributed to the DC power-supply circuitry and
to the AC driver circuitry, which controls AC voltage to the fuser-assembly heating element.
DC power distribution
The DC power distribution circuitry, located on the printer (product base) power assembly, distributes
+3.3 Vdc, +5 Vdc, and +24 Vdc as shown in
Table 5-4 DC power distribution on page 46:
Table 5-4 DC power distribution
+3.3 Vdc ECU, sensors, formatter
+5 Vdc Control panel
+24 Vdc Main motor, laser/scanner motor, ADF motor, solenoid, high-voltage power supply, fuser, safety circuit,
door switch
Overcurrent/overvoltage
There are two overvoltage devices in this product:
●
Fuse F101 provides overcurrent protection for the fusing-system circuitry.
●
Fuse F102 (110 V product models only) provides overcurrent protection to the product DC power-
supply circuitry.
You can check or replace the fuses by removing the left cover.
NOTE: If either of these fuses fails, replace the power supply. See Power supply on page 119.
46 Chapter 5 Operational theory ENWW
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