Engine control system (engine control unit and power-supply assembly)
The engine control system coordinates all print engine activities. The engine control system includes
both the engine control unit (ECU) printed circuit assembly (PCA) and the power-supply 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 M1319f, the control functions
are primarily relegated to the ECU PCA and the power functions to the power-supply assembly PCA.
The ECU controls the following systems and functions:
●
Print-engine control
◦
Paper-motion monitoring and control (printing)
◦
Motor
●
Product base laser/scanner
The power-supply assembly provides the following functions to the power system:
●
AC power distribution
●
DC power distribution
●
Overcurrent/overvoltage protection
●
High-voltage power distribution
Print-engine control system
Paper motion monitoring and control. The ECU controls paper motion in the product by continuously
monitoring the two paper sensors and coordinating the timing with the other print processes.
Motor. The ECU controls the motor. The motor drives all of the product paper movement.
44 Chapter 5 Operational theory ENWW
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