Fuser Control; Figure 2-15. Main Motor Drive Circuit; Figure 2-16. Fuser Control Circuit - Epson EPL-N1200 Service Manual

EPL-N1200 Service Manual Operating Principles
Figure 2-15 shows the main motor drive circuit. The main motor (M1) is a four-phase stepping
motor. This motor is controlled by the CPU (IC1) on the engine controller board (PWB-A). The
power supply board (PU1) has a stepping motor driver IC. This IC drives the main motor (M1) with
a constant current.

Figure 2-15. Main Motor Drive Circuit

2.1.2.2 Fuser Control

The fuser is heated by the heater lamp, which is powered by AC voltage. When the power supply
board receives a FUSER LAMP signal from the engine controller board (PWB-A), the power supply
board (PU1) supplies the AC voltage to the heater lamp. This AC voltage is cut by the interlock
switch when the top cover opens.
The fuser temperature is detected by the thermistor. Based on the TH1 signal from the thermistor,
the engine controller board (PWB-A) controls the fusing temperature using the FUSER LAMP
signal.

Figure 2-16. Fuser Control Circuit

Rev. A 2-11