Service manual

The ECU controls the following systems and functions:
■ Printer-engine control
■ Paper-motion monitoring and control (printing)
■ Motor
■ Printer laser/scanner unit
The engine-power assembly provides the following features in the power system:
■ AC power distribution
■ DC power distribution
■ Overcurrent/overvoltage protection
■ High-voltage power distribution
Printer-engine-control system
Paper motion monitoring and control
The ECU controls paper motion in the printer by continuously monitoring the two paper sensors and
coordinating the timing with the other print processes.
For a detailed explanation of paper movement and the interaction of the sensors and pickup solenoid
with the paper-movement process, see
Printer paper-feed system on page 56.
Motor
The ECU controls the motor. The motor drives all of the paper movement in the printer.
ENWW Printer functions 51