Main Motor Mechanism Control; Laser Unit Control - Epson EPL-N2000 Service Manual

EPL-N2000 Service Manual
2.2.1.1 Main Motor Mechanism and Control
The main motor, which is located in the driving unit, transmits drive force to the rollers in the
printer. A main motor malfunction is detected if any of following conditions is detected:
1. The lock signal (CN5-1) goes OFF (LOW), and the OFF status continues for 1 second or
more.
2. The lock signal (CN5-1) does not go OFF (LOW) within 1 second after the main motor
goes ON (CN5-2=Low).
Figure 2-10 shows the main motor (M1) drive circuit.

2.2.1.2 Laser Unit Control

The laser unit, which consists of the laser diode unit and the polygon mirror, exposes the PC drum.
The output level of laser is adjusted prior to the printing, and a laser error occurs if the adjustment
fails.
If any of following conditions in the polygon motor is detected, the polygon motor is regarded as
malfunctioning.
1. The polygon motor lock signal does not go ON within 10 seconds after the polygon
motor goes ON.
2. The polygon motor lock signal goes ON after the polygon motor is energized, but it goes
OFF again and does not come back ON within 1 second or more.
3. The SOS signal is not detected during printing.
Rev.A
Figure 2-10. Main Motor Drive Circuit
Figure 2-11. Laser Control
Operating Principles
2-11