HP LaserJet 1010 series

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
Photosensitiv
e
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