DOWNLOAD Panasonic PT-EX12KU / PT-EX12KE Service Manual ↓ Size: 31.28 MB | Pages: 127 in PDF or view online for FREE

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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

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The projector provides the detection circuits of the power failure and the fan lock. When the detection circuit detects 
an error at the power supply line or at the fan operation circuit, the projector will turn into the standby mode to protect 
the other circuits defective.

CAUTION
DO NOT LEAVE THE PROJECTOR WITH THE AC POWER CORD 
CONNECTED UNDER AN ABNORMAL CONDITION. IT MAY RE-
SULT IN FIRE OR ELECTRIC SHOCK.

When the projector detects an abnormal condition (Power supply lines failure 
, fans failure), it will be automatically shut down to protect the inside of the 
projector and the <STANDBY> indicator lights on and other indicators blink. 
In this case, unplug the AC power cord and plug it, and then turn on the pro-
jector once again to verify operation. If the projector cannot be turned on and 
these indicators are still lighting and blinking, unplug the AC power cord. See 
the troubleshooting chapter.

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When cleaning or replacing the unit, always turn off the power and remove the power plug from the outlet.

n

  Wipe off dirt and dust with a soft, dry cloth.
  •  If the dirt is persistent, soak the cloth with water and wring it thoroughly before wiping. Dry off the projector with 

a dry cloth.

  •  Do not use solvents such as benzene, thinner, rubbing alcohol, household cleaners, or chemical wipes. Using 

them may cause deterioration of the outer case.

n

  Wipe off dirt and dust off the front surface of the lens with a soft, dry, and clean cloth.
  • Do not use a cloth that is fluffy, dusty, or soaked with oil/water.
  • Do not use excessive force when wiping the lens as it is fragile.

  •  Lenses are made of glass. Impacts or excessive force when wiping may scratch its surface. Please handle with 

care.

  •  Never use flammable solvents or air sprays on or around the projector. The temperature within the projector 

may be extremely hot due to the projection lamp operation. An explosion or fire may still occur even after turn-
ing off the projector. Other than flammable air spray, the internal parts may also become damaged due to cold 
air.

n

Clean the air filter in the following cases.
  •  When the replacement message is displayed and the filter indicator <WARNING FILTER> lights up due to a 

blockage.

  •  The temperature inside the projector becomes high and the temperature indicator <WARNING TEMP.> lights, 

causing the projector turn off, due to a blockage. (When the power if turned off, the temperature indicator 
<WARNING TEMP.> and standby indicator <STANDBY> flashes.)

1) Slide the air filter cover.
  • Pull and slide the air filter cover in the direction shown by the arrow.
  • The top part of the air filter appears.

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2) Remove the air filter.
  • Hold the grip of the air filter to pull up.

3) Cleaning the air filter
  • Removing the dust from the air filter
    (i) Remove the dust from the air filter using a vacuum or other cleaner.
     

• If the dust persists after cleaning with a vacuum, wash the air filter in water.

  • Washing the air filter
    (i) Soak the air filter in water or warm water and rinse it lightly.
     

• Do not use materials such as blushes or detergent.

     

• When you rinse the air filter, hold the frame and avoid excessive force on the filter part.

    (ii) Change the water two or three times while you rinse the air filter.
     

• Rinse it until the cloud of the water clears. If the air filter is not rinsed sufficiently, odor may result.

  • Drying the air filter
    Naturally dry the air filter in a well-ventilated place, avoiding dust and direct sunlight.
    • Do not use a hair drier or other drier.