HP LaserJet 1010 Service Manual - Page 51

Printer functions, Engine control system (engine control unit and power assembly), FORMATTER

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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 LASER/SCANNER UNIT Scanning mirror To external device (host computer, etc.) FORMATTER Figure 4-2. Note Laser diode BD sensor Scanner motor ENGINE CONTROL SYSTEM Engine power assembly ECU Fuser unit IMAGE FORMATION SYSTEM Cleaning unit Primary charging roller Photo sensitive drum Developing unit Transfer charging roller Priority input tray Pickup control unit Main input tray PAPER PICKUP/FEED SYSTEM 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. 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

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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