Epson AcuLaser M4000N, Service Manual

Page: 54 / 477

EPSON EPL-N3000/AcuLaser M4000N Revision C
Operating Principles Functions of Major Components 54
Confidential
2.5.8 ELECTRICAL
INTERLOCK S/W 24V
When the COVER OPEN is open, this safety switch shuts off the power supply of 24
VDC from the LVPS to the HVPS/MCU, MAIN MOTOR, etc.
INTERLOCK S/W 5V
When the COVER OPEN is open, this safety switch shuts off the power supply of 5
VDC from the LVPS to the LD Assembly of the ROS ASSY, etc.
INTERLOCK S/W REAR
When the COVER REAR is open, this safety switch shuts off the power supply of 24
VDC from the LVPS to the HVPS/MCU, MAIN MOTOR, etc.
FAN MAIN
To prevent abnormal temperature rise inside the printer, this fan sends out the air from
inside the printer.
FAN SUB
To prevent an abnormal temperature rise inside the printer, this fan takes in outside air.
Mounted above the ROS ASSY in the center of the Front side, this fan takes in outside
air from the Front side.
LVPS
Generates low DC voltages (5 V and 3.3 V for the logic circuits, 5 V for the
Laser Diode and 24 V for the motor and clutch) from AC power.
HVPS/MCU
The functions of HVPS and those of MCU are incorporated on one circuit board. The
HVPS circuit generates AC and DC high voltages and supplies them to the processes
for charging (BCR), development (Magnet Roll), transfer (BTR) and separation
(Detack Saw).
The MCU circuit controls printing operation based on communication with the print
controller and information sent from sensors and switches.
CONTROLLER BOARD
Receives data from the host to print paper and control the whole printer.
PWBA EXIT MOTOR
Controls the MOTOR ASSY EXIT according to the signal from the HVPS/MCU.
SWITCH I/L ASSY (EPL-N3000 ONLY)
Consists of the two following safety switches:
†
INTERLOCK S/W 5VR
When the COVER OPEN is opened, this safety switch shuts off the power supply
of 5 VDC from the LVPS to the LD Assembly of the ROS ASSY and others.
†
INTERLOCK S/W Front R
When the COVER OPEN is opened, this safety switch disconnects the
INTERLOCK BEF (Front Cover Open detection signal) transmitted from the
LVPS to the HVPS/MCU.
Figure 2-32. Major Components of the ELECTRICAL
J26125EAK1
PWBA EXIT MOTOR
LVPS
FAN SUB
HVPS/MCU
PWBA ESS
INTERLOCK S/W 24V
(EPL-N3000 only)
INTERLOCK S/W 5V
(EPL-N3000 only)
INTERLOCK S/W REAR FAN MAIN
CONTROL PANEL (ROUGH)