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The temperature monitor system is provided to prevents damage of optical components (the LCD panel and polarization film
etc.) inside a projector from overheat. Two protection systems are provided.
Each system operation as follows ;
----- The temperature monitor -1: -----
■
To control the driving power of the cooling fans.
The CPU checks the temperature and atmospheric pres-
sure 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 polarization glass
(PTH901) and inhalation air(IC5801). If each part tem-
perature reaches to abnormal temperature, the CPU will
turn off a projector, and will blink WARNING TEMP.
indicator at intervals of 0.6 seconds. Cooling fans operate
until temperature returns to normal. Indicator will stop
blink, if temperature returns to normal.
PRESSURE
SENSOR
IC4849
PTH901
Temp. Sensor
(Blue polarization glass)
Temperature sensors
location
❏
Overheating Protection
Blue polarizer unit
IC5801
Temp. Sensor
(Inhalation air)
--
The temperature monitor system --
----- The temperature monitor -2 : -----
(Temperature check of lamps. )
Temperature switches (SW 903~906) are arranged near
the four lamps. Temperature switches will operate, if
temperature reaches 100 degrees.
SW (903~906)
-----
(Lamp-1~4)
When temperature switches have operated, lamp ballast
units will be shut down, then a projector will be turned
off.
Note. The CPU does not check operation of temperature
switches. Therefore, when temperature switches have
operated and a projector has shut down, WARNING
TEMP. indicator does not blink.
- 7 -
It operates at 100 degrees.
Temp.
SENSOR
IC1519
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