Epson EMP-S4 - Power Supply Ballast Unit; Power Supply Circuit Block Diagram

2-11
EMP-S4
SEIKO EPSON Revision:B
2.5 Power Supply Ballast Unit
The Power Supply Ballast Unit contains the power supply/ballast section, power supply filter
and the AC cord socket. The power supply/ballast section re-regulates the DC power supply
that comes from the AC inlet and power supply filter in order to generate the AC power supply
170W for the lamps.
Figure 2-12. Power Supply Ballast Unit
2.5.1 Power Supply Circuit Block Diagram
Figure 2-13. Power Supply Circuit Block Diagram
Fuse: Protects the power supply and internal circuitry from overcurrent on
the AC supply line.
EMI filter circuit: Eliminates interference from the AC power supply input.
AC Inlet
A
C Input
A
C100-240V
Ballast output
250W
DC output
to CN2000
on MA board
EMI Filter
EMI Filter
The First Power Supply
Smoothing/Control circuits
Secondary Power Supply