----- The temperature monitor -1: -----
■ To control the driving power of the cooling fans.
The CPU checks the temperature and atmospheric pressure
inside a projector. It checks a temperature using temperature
sensor-IC5801 and 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 tem-
perature.
■ To shut down the projector.
The CPU checks temperature of Red-LCD panel periphery
(IC2541) and inhalation air(IC5801). If each part temperature
reaches to abnormal temperature(IC2541 ; 47degrees /
IC5801 ; 42degrees), the CPU will turn off a projector, and
will blink TEMPERATURE WARNING indicator at intervals
of 0.6 seconds. Cooling fans operate until temperature returns
to normal. Indicator will stop blink, if temperature returns to
normal.
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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 -2 : ---
(Temperature check of lamps. )
Temperature switches (SW 903~904) are arranged near the
two lamps. Temperature switches will operate, if temperature
reaches 90~100 degrees.
SW904 (Lamp-1)----- It operates at 90 degrees.
SW903 (Lamp-2)----- It operates at 100 degrees.
When temperature switches have operated, lamp ballast units
will be shut down, then a projector will be turned off.
Note.
CPU does not check operation of temperature switches.
Therefore, when temperature switches have operated and a
projector has shut down, TEMPERATURE-WARNING
indicator does not blink.
Y/V
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