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