Epson EPL-5500 - Fan Motor Control; Power Supply Circuit Function and Safety Protection

2.1.2.7 Fan Motor Control
The fan motor (M3) rotates at engine initialization, and stops after 2 sec. The fan motor also rotates
during printing. When printing ends, the fan motor stops after 3 min. If the following condition is
detected, the printer indicates a Fan motor error.
The voltage equivalent to the motor current of the fan motor remains 160 mV or lower for 2 sec.
2.1.2.8 Power Supply Circuit Function and Safety Protection
The printer’s power supply board (PWB-E) supplies the +5 VDC and +24 VDC. The +24 VDC is
used as the bias voltage supply, main motor (M1) drive, scanner motor (M2) drive, fan motor (M3)
drive, and solenoid drive. For safety protection, the +24 VDC line is cut when the interlock switch
(case open switch) is off.
AC IN
Interlock
SW
+24 VDC
+5 VDC
FG
SG
Power Supply Board
(PWB-E)
Figure 2-24. Power Supply Circuit Block Diagram
Operating Principles EPL-5500 Service Manual
2-16 Rev. B