Temperature Control; Sensors And Switches - Epson EMP-1825 Service Manual

EMP-1825/EMP-1815/EMP-1810

2.3 Temperature Control

The internal temperature of this projector is monitored by the sensors (the Lamp thermistor, L/
V thermistor) in order to protect the projector from internal overheat, which may cause unsafe
state or damage to the projector. The fans' revolutions are controled according to the detected
temperature data. The fans' revolutions are altered by changing the driving voltage based on
the detected data. In this way, the ventilation level is optimaized and the internal temperature is
kept stablized.

2.3.1 Sensors and Switches

The fans and sensors mounted in this product, and the routes of air flow are shown below.
EX Fan
TH Board
Lamp Fan
PS Ballast
(Heat source)
Part Name
Intake Fan A/B
P/S Fan
Lamp Fan
PBS Fan
EX Fan
SEIKO EPSON
Lamp (Heat source)
Figure 2-5.
Take in fresh air from the intake duct (with Air Filter) located in the bottom of
the projector, and supply it to the Light Valves R/G/B.
Ventilates the circuit boards of the PS Ballast Assy.
Ventilates the inside of the Lamp Unit.
Ventilates the PBS (Polarizer) of the Optical Engine.
Exhausts the heated air generated inside the projector to the outside.
PBS Fan
P/S Fan Intake Fans
Function
2-7
CONFIDENTIAL
POP (Susceptible to heat)
LV
Thermistor
Revision:C