Power Supply Unit; Power Supply Unit Circuit Block - Epson EMP-8000 Service Manual

2.3. P ower Su pply Un it
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.
AC input Connector
Power Supply Fan
DC Output/Input cable
(connected to Main board
Assy unit)
2.3.1. P ower su pply u n it cir cu it 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.)

AC INLET
AC input
Ballast
output
C
N
DC
2
output
0
3
PW ON
FAN CL
Revision:A
EMP-9000/8000
Figure2-10
CN103
Interlock
Switch
Ballast Power
Supply
Main power Supply
(DC regurator)
Figure2-11
Thermostat
Sub Power Supply Circuit
2-8
Power Supply connector
for Ballast
EMI Filter
Primary
regulator
circuit
(+3.3R)
Resident Power Supply
CN201
Cooling fan
Power Supply
SEIKO EPSON
Fan