Power Supply Unit - Epson ELP-3500 Service Manual

2.2 POWER SUPPLY UNIT

The power supply unit includes a DC regulator, exhaust fan, and interlock switch for the
lamp cover. This unit generates the voltages for the control circuit (+5 V, +12 V, +18 V)
and for the light source lamp (+65 V) from the AC input. Although a functional diagram is
shown below, never disassemble the power supply unit during field maintenance service.
Power Supply Unit
Functional Block Diagram
FUSE
AC IN 250 V - 6.3 A
SAFETY
SWITCH
(overheating
protection)
CONNECTIONS TO MAIN BOARD AND DRIVER BOARD
* An interlock switch is included for safety purposes. The interlock switch shuts off the supply of AC power if
the lamp cover at the bottom of main chassis is opened.
* The safety switch input signal is designed for protection from overheating. It stops power output to the light
source lamp if the projector detects overheating in the lamp housing area.
Figure 2-5.
INTERLOCK SW POWER SW
NC
NC
MAIN
BOARD
CN505
Figure 2-6.
EPSON ELP-3500 Service Manual
FILTER/
RECTIFIER
EXHAUST FAN
LAMP
2-4
REGULATOR
+6.5 V
+5 V
+18 V
+12 V