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

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.

2.5.1 Power Supply Circuit Block Diagram

AC Input
AC100-240V
Ballast output
250W
DC output
to CN2000
on MA board
Fuse:
EMI filter circuit:
SEIKO EPSON
EMP-S4
Figure 2-12. Power Supply Ballast Unit
EMI Filter
Secondary Power Supply
Figure 2-13. Power Supply Circuit Block Diagram
Protects the power supply and internal circuitry from overcurrent on
the AC supply line.
Eliminates interference from the AC power supply input.
2-11
AC Inlet
EMI Filter
The First Power Supply
Smoothing/Control circuits
Revision:B