Scanner Mirror Motor Control; Laser Diode Drive; Figure 2-18. Scanner Motor Control Circuit; Figure 2-19. Laser Diode Drive Circuit - Epson EPL-N1200 Service Manual

EPL-N1200 Service Manual Operating Principles

2.1.2.3 Scanner Mirror Motor Control

Figure 2-18 is the scanner mirror motor (M2) control circuit. The scanner mirror motor is driven
while the scanner motor receives the POLYGON MOTOR (M2:ON) signal.

Figure 2-18. Scanner Motor Control Circuit

2.1.2.4 Laser Diode Drive

Figure 2-19 shows the laser diode drive circuit. Laser diode emission is controlled by three signals
(L DATA, DA1, and DA2) from the engine controller board (PWB-A).

Figure 2-19. Laser Diode Drive Circuit

The L DATA signal is the laser ON/OFF signal. When it is LOW, the laser emits, and when it is
HIGH, the laser stops emitting. L DATA is the combination of the two signals in the figure below. If
the VIDEO or the FORCED LASER DIODE ON signal is activated (LOW), the L DATA signal will be
active. The VIDEO signal is an image signal sent from the video controller board (C205 MAIN
board). The FORCED LASER DIODE ON signal is a laser emission signal to apply the laser beam
to the SOS sensor.

Figure 2-20. /L DATA Generation Circuit

Rev. A 2-13