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Circuit Protections
● Temperature Monitor System
■
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-IC4849.
The CPU controls the driving power of the cooling fans so the temperature inside the projector is maintained to
normal temperature.
■
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.
Pressure Sensor
IC4849
Temp. Sensor
(Blue polarized glass)
PTH901
Blue polarizer unit
Temp. Sensor
(Inhalation air)
IC5801
Temperature sensors location
- 8 -
Temp. Sensor
IC1519
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