Epson EMP-1815, Service Manual

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CONFIDENTIAL EMP-1825/EMP-1815/EMP-1810
SEIKO EPSON Revision:C
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.
Figure 2-5.
Part Name Function
Intake Fan A/B
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.
P/S Fan Ventilates the circuit boards of the PS Ballast Assy.
Lamp Fan Ventilates the inside of the Lamp Unit.
PBS Fan Ventilates the PBS (Polarizer) of the Optical Engine.
EX Fan Exhausts the heated air generated inside the projector to the outside.
PBS Fan
EX Fan
TH Board
Lamp Fan
P/S Fan Intake Fans
LV
Thermistor
Lamp (Heat source)
PS Ballast
(Heat source)
POP (Susceptible to heat)