Epson EPL-N1200 Service Manual - Page 72

Controller Board, C205 MAIN, Forced Laser Diode

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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. Engine Controller Board (PWB-A) CN5A 5 +24V 4 GND2 3 POLYGON MOTOR 2 PORYGON LOCK 1 PORYGON CLOCK Scanner Motor M2 M 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). CN5A 12 S SCAN 11 CO 10 DA2 9 DA1 7 L DATA LD SOS (PWB-D) Laser Diode SOS Mirror Engine Controller Board (PWB-A) SOS sensor 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. Forced Laser Diode ON VIDEO from the Video Controller Board (C205 MAIN) Figure 2-20. /L DATA Generation Circuit L DATA Rev. A 2-13

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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.
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).
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.
+24V
GND2
POLYGON MOTOR
PORYGON LOCK
PORYGON CLOCK
5
4
3
2
1
CN5A
Engine Controller Board
(PWB-A)
Scanner Motor
M2
M
Figure 2-18.
Scanner Motor Control Circuit
S SCAN
CO
DA2
DA1
L DATA
Engine Controller
Board (PWB-A)
LD
SOS
(PWB-D)
Laser Diode
SOS sensor
SOS Mirror
12
11
10
7
9
CN5A
Figure 2-19.
Laser Diode Drive Circuit
L DATA
Forced Laser Diode ON
VIDEO
from the Video
Controller Board
(C205 MAIN)
Figure 2-20.
/L DATA Generation Circuit
EPL-N1200 Service Manual
Operating Principles
Rev. A
2-13