PT-EX12KU, PT-EX12KE - Panasonic Projector Service Manual (repair manual). Page 13

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The projector provides 2 temperature sensor ICs, 1 sensor on the main board and 1 sensor on the ex temp board, 
and 1 wind sensor on the intake duct. The sensor ICs monitor surrounding temperature of the panels/prism, and 
surrounding temperature of the intake duct, and the wind sensor monitors airflow passed through the air filter in the 
intake duct.
- Temperature sensor (IC8856) on the main board for monitoring the surrounding temperature of B-panel.
-  Temperature sensor (IC8811) on the ex temp board for monitoring the surrounding temperature of the intake duct. 
- Wind sensor (S901) on the filter box. 

When  the  temperature  inside  the  projector  reaches  a  certain  level,  the 
<WARNING TEMP.> indicator starts blinking. If the temperature rises more-
over,  the  projector  will  be  automatically  shut  down  to  protect  the  inside  of 
the projector, and the <WARNING TEMP.> indicator is blinking fast and the 
<POWER> indicator turns off. When the projector has cooled down enough 
(to its normal operating temperature), the <POWER> indicator turns on and 
the projector can be turned on again by pressing the 

 button.

✔

•   The <WARNING TEMP.> indicator continues to blink even after the tem-

perature inside the projector returns to normal. When the projector is turned 
on again, the <WARNING TEMP.> indicator stops blinking. 

Check the items below
- Remove dust around the air filter.
-  Ventilation slots of the projector are blocked. In such an event, reposition the 

projector so that ventilation slots are not obstructed.

-  Check if projector is used at higher temperature place (Norma; operating 

temperature is 0 to 40 ºC or 32 to 104 ºF).

IC8856
(Behind)

S901
Wind sensor

IC8811