Print engine control system
Printer laser/scanner drive
Based on information received from the formatter, the ECU sends signals to the laser/scanner assembly to modulate the laser diode “on” and “off” and to drive the laser/scanner motor. For more information, see “Image formation system” later in this chapter.
Paper motion monitoring and control
The ECU controls paper motion 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 photosensors and solenoid with the paper movement process, see the “Printer feed system” section later in this chapter.
12-volt DC power shutoff switch
The
Engine test switch
The engine test switch (SW201), located on the ECU, is activated manually from the bottom of the HP LaserJet 3100/3150 product. The switch causes the print engine to perform a
Motor
The motor is controlled by the ECU. The motor provides all of the printer's paper movement.
EN | ECU/power system 69 |