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How To Unlock a NEC Projector?


NEC projectors display many different lock messages. It can be difficult to figure out just how to unlock your projector, from a cabinet lock to a fan lock. 

Your projector locking can be scary, especially if the buttons and lamp are unresponsive. 

Don’t fret. Your projector hasn’t died. But how can you get your unit working normally without taking it to a projector technician? 

What types of locks are there on NEC projectors? 

How can you unlock a NEC projector? 

Keep reading to find out! 

How to Unlock a Control Panel Key / Cabinet Lock?

Hold the Cancel/Exit button to unlock the Control Panel.

to hold the exit button

If your NEC projector’s control panel is locked, you may have accidentally enabled Cabinet lock

This type of lock can be useful if you don’t want others pressing the control panel buttons or using the projector. 

However, a cabinet lock can become a nuisance if you’re using your projector at home. 

Luckily, you can unlock your projector with the click of a button, literally!

Find the Cancel or Exit button (depending on the model) on your unit’s control panel. Hold it down for about ten seconds, then release it. 

If you find that your projector is still locked, use your remote to open the Menu. Click Advanced, then select Cabinet Button. Select the Unlock option, then check that it’s working properly. 

Now you know how to unlock your NEC projector’s control panel! 

How to Unlock a Fan Lock?

Follow our suggestions to unlock your projector’s fan.

An NEC projector’s fan may lock for several reasons, though the most common is overheating or a dirty/misplaced filter

misplaced air filter

Touch your unit to check for overheating. Unplug it immediately if it’s warm and let it cool. 

Once cooled, ensure its air vents are clean and that the projector is uncovered. Place it on a flat, hard surface, and do not place anything within several inches. 

If your projector is still locked, check the filter unit

Locate the filters, usually found on either side of the projector, and vacuum out any dust. Do not stick anything into the filters or use any cleaning products to try and clean them. 

The projector’s filters must be locked in place for the unit to function, ensuring they’re secure. 

If you use your projector often and rarely clean the filters, you may have to replace them. Order compatible filter replacements  online or at a projector repair shop. 

Changing the bulb and filters on an NEC NP610 projector

Remove the old filters and install the new ones. When installing the new filters, listen for a small clicking sound, which will let you know they are firmly and correctly placed. 

If you’ve tried the above suggestions and your unit’s fan is still locked, contact NEC Customer Support

How to Unlock a Projector Security Lock?

Unlock your projector by inserting the password or calling the manufacturer. 

enter password

Similar to how you enter a password on your phone or computer, you can also set up a password function on your NEC projector

This is great if you want to be the only one to use the projector, or if you’re leaving it in a public space like a school or museum. 

If you know the password, type it into your projector, then click Enter. It should grant you access and unlock immediately. 

However, there is a solution if you’ve just bought a used NEC projector that’s password locked or have forgotten your password. 

Observe the 36-digit code in the Security Keyword pop-up window. This code identifies your projector and its password. 

Call NEC Customer Support, give them the code, and provide any additional information. They will give you a password that can be used to unlock your projector. 

contact customer support

Once unlocked, you can disable the security function and remove the password lock. 

Open the Menu and go to the Setup tab. Under Installation, select Security. Toggle the security feature off and check that the password function has been disabled. 

Alternatively, you can select a new password by turning it off, then on, and inserting a new password following the on-screen instructions. Just remember not to forget it! 

How to Unlock a Signal Lock? 

unlock signal lock

Unlock a signal lock through your projector’s settings. 

An NEC projector’s signal lock only allows input from one specified source. This means that if the signal lock is set to HDMI 1, you will not be able to use any of the other input sources.  

Unlock your unit’s signal lock by opening the settings. Go to Setup, select Search signal lock, and turn it off. 

Now your projector will automatically detect any input signal. 

Check Your Lamp Unit and Cover

Adjust or replace the lamp unit and cover. 

to adjust projector lamp cover

Check that your lamp is in good condition by looking at the lens. Consider replacing it if the lamp looks burnt or you’ve had your projector for a few years or when you see a Lamp Error message on the screen. 

Note that not all NEC projector models have replaceable lamps. Check under the Maintenance section in your user manual to see if your unit’s lamp can be replaced. 

We’ve all lost user manuals before. Luckily, you can read all NEC projector manuals online here

Always exercise caution when replacing projector lamp units, as they contain mercury vapor. Mercury vapor is extremely lethal, so contact your local health services immediately should you see the lamp is cracked or broken. 

Contact NEC customer support for further information before replacing the lamp unit.

Check that the lamp cover is correctly placed and observe a small, plastic post on the bottom of the cover. This post alerts your projector that the cover is correctly placed, allowing it to turn on. 

If you see that the lamp cover is damaged, contact NEC customer support

Watch the video below to learn how to remove the lamp cover on an NEC projector, using an NEC VT695 as an example. 

Note that the process of removing the lamp cover may vary depending on your projector’s model, so consult your user manual for additional information. 

NEC VT695 Projector - Remove the Lamp Cover

Wrapping Things Up

NEC projectors have several different locks, all of which require their own solutions. 

These locks can usually be fixed through your unit’s settings or by adjusting the filter, lamp unit, or cover. 

Remember, these locks are put in place to help you and your projector safe. 

If you have any more questions or concerns, don’t hesitate to reach out to NEC Customer Support

What’s your experience with unlocking an NEC projector? 

Let us know in the comments below! 

Last update on 2022-08-07 / Affiliate links / Images from Amazon Product Advertising API.


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