HP LaserJet 1010 series

Printer functions
Printer functions are divided into five groups:
● Engine control
● Formatter
● Image formation
● Laser/scanner
● Pickup and feed
The following figure is a block diagram of the printer:
Output tray
Priority input tray
Main input tray
To external device
(host computer, etc.)
Scanning mirror
Laser
diode
Cleaning
unit
Fuser
unit
Primary
charging
roller
Photo
sensitive
drum
Engine power assembly
FORMATTER
ENGINE CONTROL SYSTEM
PAPER PICKUP/FEED

SYSTEM
IMAGE
FORMATION
SYSTEM
LASER/SCANNER UNIT
BD
sensor
Scanner
motor
ECU
Pickup
control
unit
Develop-
ing unit
Transfer
charging
roller
Figure 4-2. Printer functional block diagram
Engine control system (engine control unit and power
assembly)
The engine control system coordinates all print engine activities. The engine control system
includes both the engine control unit (ECU) PCA and the engine power assembly PCA.
Note
In other HP LaserJet products, the ECU and power functions are combined onto one PCA
known as the controller PCA or the DC controller PCA. In the HP LaserJet 1010 series, the
control functions are primarily relegated to the ECU PCA and the power functions to the
engine power assembly PCA.
ENWW Printer functions 39