HP LaserJet 1010 Service Manual - Page 53

Power system on the engine power assembly,

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VDO /VDO /BDI CNT0 CNT1 /BD /ACC /DEC Laser driver PCB Cylindrical lens BD sensor Photosensitive drum Figure 4-3. Formatter Engine controller PCB Laser/scanner operation Four-sided mirror Scanner motor Focusing lens Power system on the engine power assembly The AC, DC, and high-voltage power supply circuits are all provided by the engine power assembly. 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: Overcurrent/overvoltage ECU, sensors, formatter Parallel interface on the 1015 formatter Main motor, laser/scanner motor, solenoid, highvoltage power supply, fuser, safety circuit, door switch ENWW Printer functions 41

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VDO
/VDO
CNT0
CNT1
/BDI
/BD
/ACC
/DEC
Formatter
Laser driver PCB
Focusing lens
Scanner motor
Four-sided
mirror
Cylindrical lens
BD
sensor
Engine
controller
PCB
Photosensitive
drum
Figure 4-3.
Laser/scanner operation
Power system on the engine power assembly
The AC, DC, and high-voltage power supply circuits are all provided by the engine power
assembly.
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 1015 formatter
●
+24 Vdc:
Main motor, laser/scanner motor, solenoid, high-
voltage power supply, fuser, safety circuit, door
switch
Overcurrent/overvoltage
ENWW
Printer functions
41