Question about Hitachi CP-X250 Multimedia Projector

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Check air flow

A small whit bow comes up in the middle of the screen saying check air flow. I cannot get it off. What should I do?

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Re: Check air flow

You need to clean the filters. When the filters collect alot of dust on them, they block the airflow to the internal parts of the projector and can cause the bulb to blow due to the temperature getting to hot.

Posted on Dec 05, 2007

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A growing black spot

the heat from the lamp has damaged your LCD panel
you may need to service the projector check the air flow o avoid further damage to the panels
check the filter and see if it is blocking the air flow!
in most cases the LCD panel has to be replaced and its not worth doing so as it cost a bomb

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The machine says please clean filter, do you know what we need to do and how. Thank you Peter

The filter is a very important to the COOLING OF THE LAMP and so if this is clogged there will not be free flow which can reduce the lamp hours.
So check the filter which is a small window with a LID that must be opened- close to the fan vent. This air is pulled up through the filter and so must be clean. Also the lid must be placed back properly to activate the micro switch within the door to allow the set the power on.

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It says to Check the air flow

Open the cover. At some ends there will be 'filters', to clean the air entering the projector. If these filters are blocked with dust or lint, air flow will be blocked.
Clean any dust from these filters. Close the cover and check whether your problem is solved.

Sep 14, 2011 | Hitachi CP-X251 LCD Projector

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What do I do when I get a box that says to 'Check Air Flow'? Nothing is blocking the air flow....

There is probably dust and dirt blocking the air flow...
Use a spray can of dust remover like you would use on your keyboard and blow out the passageways where the fan pulls the air in and blows it out again...


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My InFocus IN2102EP projector is recently projecting a small white spot. If it was a PC, I'd say that a pixel was out. I've try blowing compressed air in various places, and have removed and replaced the...

Sounds like the DMD chip is on it's way out.
Check if the intermittent problem is related to the external air temperature. Try blowing cold air around the unit with a personal fan to see if it does the same thing.
Check if the air vents and filter is clean

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If you have the user manual,read it first.It will show the reasons why those messages are poping up.Temperature sensors are located on the vents which gives you the problem messages. Usual problem is that the vents cooling your system is blocked preventing the air to cool your heating lamp.If you want to do service on your own(try your warranty first,opening the unit voids the warranty) you can unscrew the covers yourself.Unplug the unit first.Get a clear tape and as you remove the screws,tape the screws near the holes you got them from to prevent confusion upon rescrewing the covers back.Locate the vents filters,usually found on near exhaust fans and locate another one with a foam and screen near a smaller fan.Blow or get a smaller powered vacuum to **** dirts out.Re-install the foam and screen filter the way you removed it,be sure to observe the connector for the fans.

Nov 25, 2010 | Hitachi CP-X260 LCD Projector

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Hitachi CP-x430 "Check air flow"

I have run in to this time and time again. This is why I like to keep things clean. take the bulb out and blow the unit out with air and make sure you wipe off what you can with Q-tips The blub allows air to flow thew the filament so what ever dust that might touch the fillament while its burning will burn at a higher temp. this will send and indication to the unit to send a message that says replace bulb soon and If there is not enough air flow it will say CHeck air flow take the fliter out and clean it with water dont replace it. IF you do just buy a carbon pad and cover the hole(not recomended foir those who are not handy) but keep things clean and it will save you $ in the long run. How many bulbs do you want to buy?

Dec 20, 2008 | Hitachi CP-X430 Multimedia Projector

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ok " sounds like you have a bad heat sensor , it will have to be replaced.

Jan 21, 2008 | Hitachi Performa CP-RS55 Multimedia...

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A yellow blob in the middle of the Screen

Recently, I had exactly the same problem on my VPl CX1 but also found the solution on the web. It is overheating. I cleaned the filter that is underneath the projector and also raised it slightly (resting on the lens cover and rear stand) for better air flow. Problem least for me.

Sep 21, 2007 | Sony VPL CX1 Multimedia Projector

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Displayed massege to check air flow

With most projectors there is a foam air filter behind a grill that is the opening to the cooling channels. A fan ensures air flow to cool the lamp, etc. This filter prevents dust from gumming up the works (and depending on design) may prevent dust getting into the optics. As the filter gets dirty it gradually cuts off the air and at some point a protective circuit kicks in and turns off the lamp.
If the projector is on you will feel a stream of hot air coming out of the exit vent. Projectors vary in terms of amount of air flow, so its difficult to define what is normal for a specific model. However, you can simply hold a hand in front of the vent and see if there is air flow (It will be hot air so, careful). If there is a "good" stream of air things are fine, but if only a very light flow is felt the filter may be dirty.
If the filter has not been cleaned or replaced recently make sure the projector is turned off and cooled down then take off the inlet cover and remove the filter. Clean or replace per the instructions for the projector (and periodically as defined .. but taking into account the operating conditions). Once cleaned turn on the projector and feel the "normal" air current for future reference.
Heat is one of the major causes of projector failure, so make sure cooling vents (inlet and outlet) are not obstructed and filters are kept clean

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