Power Supply Unit - Epson PowerLite 5000 Service Manual

EPSON PowerLite 5000 Service Manual

2.2 POWER SUPPLY UNIT

The power supply unit includes a DC regulator, intake fan, and interlock switch for the
lamp cover. This unit generates the voltages for the control circuit (+3.3 V, +5 V, +12 V,
+22 V) and for the light source lamp (+350 V) from AC input.
The PBS thermistor is installed on the side of the power supply intake fan and is retained
with a clamp on the power supply unit. It detects the temperature. If it senses overheating,
it shuts off the regulator output via the main board. Although a functional diagram is shown
below, never disassemble the power supply unit at field maintenance service.
Connects to
CN800 on the
main board
(DC output and
power control
signals)
PBS Thermistor
Intake Fan
Functional Block
AC IN
MAIN
BOARD
Figure 2-5
INTERLOCK SW
N/C
C
N
8
6
0
PBS Thermistor
CN800
Figure 2-6
SAFETY SW
N/C
FILTER/
RECTIFIER
INTAKE FAN
LAMP
2-6
Interlock Switch
Power Cable for
Light Source
REGULATOR
350 V
+5 V
+22 V
+12 V
+3.3 V