HP 1018 Service Manual - Page 52

Power system on the engine power assembly, AC power distribution, Overcurrent/overvoltage

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Page 52 highlights

Power system on the engine power assembly The engine-power assembly provides 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. 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 engine-power assembly, distributes +3.3 Vdc, +5 Vdc, and +24 Vdc as follows: ● +3.3 Vdc ● +5 Vdc ● +24 Vdc ECU, sensors, formatter Parallel interface on the HP LJ 1015 printer formatter Main motor, laser/scanner motor, solenoid, high-voltage power supply, fuser, safety circuit, door switch CAUTION Overcurrent/overvoltage Two overvoltage devices are in this printer: ● Fuse F101 provides overcurrent protection for the fusing-system circuitry. ● Fuse F102 (110 V printers only) provides overcurrent protection to the printer dc power-supply circuitry. You can check or replace the fuses by removing the left cover. If either of these fuses fails, replace the engine-power assembly. High-voltage power distribution The high-voltage power supply applies an overlap of dc and ac voltage to the primary-charging roller and to the developing roller. This circuit also applies a positive or negative dc voltage to the transfer roller according to the instructions from the engine-control unit. This circuit also controls the image density by changing the primary ac voltage and the developing ac bias according to the print-density setting. See Setting media types on page 22. The high-voltage power supply is disabled when the print-cartridge door is open. 44 Chapter 4 Operational overview ENWW

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Power system on the engine power assembly
The engine-power assembly provides 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. 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 engine-power assembly, distributes +3.3 Vdc,
+5 Vdc, and +24 Vdc as follows:
●
+3.3 Vdc
ECU, sensors, formatter
●
+5 Vdc
Parallel interface on the HP LJ 1015 printer formatter
●
+24 Vdc
Main motor, laser/scanner motor, solenoid, high-voltage power supply, fuser, safety
circuit, door switch
CAUTION
Overcurrent/overvoltage
Two overvoltage devices are in this printer:
●
Fuse F101 provides overcurrent protection for the fusing-system circuitry.
●
Fuse F102 (110 V printers only) provides overcurrent protection to the printer dc power-supply
circuitry.
You can check or replace the fuses by removing the left cover. If either of these fuses fails, replace
the engine-power assembly.
High-voltage power distribution
The high-voltage power supply applies an overlap of dc and ac voltage to the primary-charging roller
and to the developing roller. This circuit also applies a positive or negative dc voltage to the transfer
roller according to the instructions from the engine-control unit.
This circuit also controls the image density by changing the primary ac voltage and the developing ac
bias according to the print-density setting. See
Setting
media
types
on
page
22
.
The high-voltage power supply is disabled when the print-cartridge door is open.
44
Chapter 4
Operational overview
ENWW