Laser Diode Drive - Epson ActionLaser 1600 Service Manual

Principles of Operation
Figure 2-22 is the scanner mirror motor driving timing chart. The scanner mirror
motor rotates 0.15 seconds after the main motor (Ml) turns on. If the MIRROR
MOTOR LOCK (M2:LOCK) signal is not turned on within 3 seconds after the
scanner mirror motor turns on, the printer indicates a scanner mirror motor
malfunction.
Figure 2-22. Scanner Motor Driving Start Timing

Laser Diode Drive

Figure 2-23 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 2-23. 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, 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 is also active. The VIDEO signal is
an image signal sent from the video controller board (C125 MAIN board). The
FORCED LASER DIODE ON signal is a laser emission signal to apply the laser
beam to the SOS sensor.
2-20
EPSON ActionLaser 1600 Service Manual