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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 laser 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 2-23. Power Supply Circuit Block Diagram
EPL-5500W Service Manual Operating Principles
Rev. A 2-15