Temperature Control; Sensors And Switches - Epson EMP-822 Service Manual

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 controlled 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 optimized and the internal temperature is
kept stabilized.

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 Thermistor)
TH Board
(PS Ballast)
PS Ballast
(Heat source)
Part Name
Intake Fan A/B
P/S Fan
Lamp Fan
EX Fan
SEIKO EPSON
EMP-822/EMP-83/EMP-X5/EMP-S5
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.
Exhausts the heated air generated inside the projector to the outside.
Lamp Fan
P/S Fan Intake Fans
Function
2-7
POP (Susceptible to heat)
Revision:A