Table of Contents
Advertisement
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: -----
I To control the air-flow 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.
CPU judges data from sensors and controls the air flow of the cooling fans so
the temperature inside the projector is maintained to normal temperature.
I To shut down the projector urgent.
The CPU checks temperature of Red-LCD panel periphery (IC2541) and
inhalation air(IC5801). If each part temperature reaches to abnormal temper-
ature(IC2541 ; 47degrees / IC5801 ; 42degrees),
the CPU will turn off a projector, and will blink TEMPERATURE WARN-
ING indicator at intervals of 0.6 seconds. Cooling fans operate until tempera-
ture returns to normal. Indicator will stop blink, if temperature returns to nor-
mal. Trace the cause of an unusual temperature, and repair the projector.
(Refer to the item of " temperature abnormality" of troubleshooting.)
"SW903" Temperature
"SW903" Temperature
switch for Lamp-2.
switch for Lamp-2.
It operates at 100˚C
It operates at 100˚C
Temperature sensors
location
❏
Overheat Protection
D7/E7
PRESSURE
PRESSURE
Sensor
Sensor
IC886
IC886
Temperature
Temperature
Sensor
Sensor
IC2541
IC2541
Temperature
Temperature
Sensor
Sensor
IC5801
IC5801
--
The temperature monitor system --
----- The temperature monitor -2 : -----
I 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)-----
SW903 (Lamp-2)-----
When temperature switches have operated, lamp ballast units will be shut
down, then a projector will be turned off.
I Note;
(1) If other protection equipments ( The function of fan operation check, The func-
tion of voltage check "Power-failure" and Temperature monitor 1 ) are rightly
operating, the lamp does not become an unusual temperature. So, the temperature
monitor 2 rarely operates. However, when those protection equipments do not
operate with fault, the temperature monitor 2 operates and the broken protection
equipment is covered. If this temperature monitor 2 operates, it is thought fault of
other protection equipments. Also trace the cause of fault of other protection
equipments with the cause of an unusual temperature.
(Refer to the item of " temperature abnormality" of troubleshooting.)
(2) The CPU does not check operation of temperature switches. Therefore, when
temperature switches have operated and a projector has shut down, TEMPERA-
TURE-WARNING indicator does not blink.
-5-
It operates at 90 degrees.
It operates at 100 degrees.
"SW904" Temperature
"SW904" Temperature
switch for Lamp-1.
switch for Lamp-1.
It operates at 90˚C
It operates at 80˚C
D7/E7
Advertisement
Table of Contents
