Epson EMP-8000 - 2.3. Power Supply Unit; 2.3.1. Power supply unit circuit block

EMP-9000/8000
2-8Revision:A SEIKO EPSON
2.3. Power Supply Unit
The power supply unit function is divided by 2, one is from the EMI filter circuit to the sub
power supply (Primary) and another is the main power supply (Secondary). The sub power
supply is actuated always, nonexistent the relation to the power ON/OFF. The main power
supply department actuation is contorolled by the power supply control signal (PWON) that is
output from the main board Assy unit.
Figure2-10
2.3.1. Power supply unit circuit block
The Power supply unit includes the EMI filter circuit, safety circuit (the thermostat), cooling
fan, sub power supply circuit and regulator circuit. (RC receptor board is not composed of the
power supply unit.)
Figure2-11
Power Supply Fan
DC Output/Input cable
(connected to Main board
Assy unit)
Power Supply connector
for Ballast
AC input Connector
EMI Filter
Primary
regulator
circuit
Thermostat
Interlock
Switch
CN103
AC INLET
AC input
Ballast
output
DC
output
C
N
2
0
3
Cooling fan
Power Supply
Fan
CN201
Sub Power Supply Circuit
(+3.3R)
Resident Power Supply
Main power Supply
(DC regurator)
PW ON
FAN CL
Ballast Power
Supply