Power Supply Unit - Epson EMP-7300 Service Manual

2.2 POWER SUPPLY UNIT

The Power Supply unit includes DC regulator, blower fan and interlock switch with
lamp cover.
The Power Supply unit generates the voltage for the control circuit (+3.3V,+5V, +12V,
+22V) and for the ballast (AC power) from AC input
Front temperature thermistor is installed on the side of the power supply inhale fan
and is retained with a clamp on the power supply unit. It detects the temperature, if it
senses overheat, it shuts off the regulator output via the CD10MA board.
Although the outline of its function is shown below, please never disassemble the
power supply unit at the field maintenance service.
Connect to
CN600 on the
CD10MA board
(DC output and
power control
signals)
Power cable for
light source
Interlock switch
(1) Function block
AC IN
CD10MA
BOARD
REV.A
Figure2- 6 Power supply unit
INTERLOCK SW SAFTY SW
N/C
C
N
6
0
0
Front temperature
Thermister
Figure2- 7 Function block
2-5
N/C
FILTER/
RECTIFIRE
POWER CONTROL
BLOWER FAN
Light source
lamp
Front temperature
Inhale fan
REGULATOR
AC
+5V
+22V
+12V
+3.3V