HP LaserJet 3052 Service Manual - Page 97
Power system on the power-supply assembly, Ac power distribution, Overcurrent/overvoltage
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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 4-5 Dc power distribution on page 77: Table 4-5 Dc power distribution +3.3 Vdc +5 Vdc +24 Vdc ECU, sensors, formatter ADF motor and scanner Main motor, laser/scanner motor, solenoid, high-voltage power supply, fuser, safety circuit, door switch Overcurrent/overvoltage There are two overvoltage devices in this all-in-one: ● Fuse F101 provides overcurrent protection for the fusing-system circuitry. ● Fuse F102 (110 V all-in-one models only) provides overcurrent protection to the all-in-one 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 175. ENWW Printer (product base) functions 77