Eiki LC-XT4E, Service Manual

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Circuit Protections
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To control the driving power of the cooling fans.
This projector detects internal temperature and automatically controls operating power of cooling fans.
The CPU checks the temperature and atmospheric pressure inside a projector. It checks a temperature using
temperature sensor-IC5801and it checks an atmospheric pressure using pressure sensor-IC886.
The CPU controls the driving power of the cooling fans so the temperature inside the projector is maintained to
normal temperature.
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To shut down the projector.
The CPU checks temperature of Blue polarized glass (PTH901) and inhalation air(IC5801). If each part temper-
ature reaches to abnormal temperature, the CPU will turn off a projector, and will blink WARNING TEMP. indi-
cator at intervals of 0.5 seconds. Cooling fans operate until temperature returns to normal. WARNING TEMP.
indicator will stop blink, if temperature returns to normal.
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Temperature Monitor System
Main Board
A-side
Front side
B-side
Temp. Sensor
IC2541
Temp. Sensor
(Inhalation air)
IC5801
Pressure Sensor
IC886
Temp. Sensor
(Blue polarized glass)
PTH901
Temperature sensors location
Blue polarizer unit