Laserdiode Drive - Epson EPL-9000 Service Manual

Operating
Laser Diode Drive
2.1.3.5
Figure 2-30 is a laser diode drive
and
DATA
MO 4
Bead (MCU
The DATA signal is the laser on/off signal. When it is LOW, the laser is allowed to emit and when
it is HIGH, the laser is stopped.
The MO is the laser emission power monitor analog signal. The engine controller board (MC
adjusts the laser emission power by
adjust signals, they are analog signals.
If the signal is not detected, it will be judged that there ia a laser diode
If the SOS signal is not detected, it would be judged as a scanner motor malfunction.
2-18
Laser diode emission is
from the engine controller board (MC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-30. Laser Diode Drive Circuit
and VLl signals.
by four signals (DATA,
and are laser emission power
malfunction.
Manual
Rev.