User guide

EN Printer functions and operation 87
Printer engine control system
Paper motion monitoring and control
The ECU controls paper motion in the printer by continuously
monitoring the various paper sensors and coordinating the timing with
the other print processes.
For a detailed explanation of paper movement and the interaction of
the photo sensors and solenoid with the paper movement process,
see “Printer paper-feed system” on page 94.
Motor
The motor is controlled by the ECU. The motor provides all of the
printer paper movement.
Printer laser/scanner drive
The ECU sends signals to the laser/scanner assembly to modulate
the laser diode “on” and “off” and to drive the laser/scanner motor.
Figure 15. Overview of laser/scanner operation