I lost my manual for my Sentry Safe SW3750 can anyone find one?

The battery compartment is in the door right behind the key pad.

How Do I Change the Batteries on My Safe? ' SentrySafe

Sentry Safe https://www.sentrysafe.com > support > faqs > how-do...
Learn how to change the batteries on your safe with step-by-step instructions, image references and video demonstrations.

Ask here. They say they have a manual.

SentrySafe G1459E 14-Gun Electronic Lock Safe Review

https://www.thesafesleuth.com > Gun Safes
User Manual - If you have lost the original operating instructions that came with the SentrySafe G1459E then feel free to download a copy of the manual: ...
‎SentrySafe G1459E 14-Gun... · ‎Who Will Benefit From This... · ‎Conclusion

Wherever you are reading 3540-1 is incorrect. This is the link to find it 'generally'.

https://www.google.com/search?q=Sentry+gun+safe+3540-1+manual

This the link that says the Search Query must include '3540-1'.

https://www.google.com/search?q=Sentry+gun+safe+%223540-1%22+manual

and finally this link only includes "sentry safe" and "3540-1".

https://www.google.com/search?q=%22Sentry+safe%22+%223540-1%22

It doesn't exist.

notify sentry customer service

go to sentry safe site and download or request one the 2nd link is the manual for the 6250
http://www.sentrysafe.com/pdfs/OwnersManuals/401149.pdf https://carlucurtprot.files.wordpress.com/2015/11/sentry-safe-6250-owner-s-manual.pdf

Brian, You can contact the manufacturer at link below, you will need factory code from them to reset. They will need forms filled out before supplying info.
http://www.sentrysafe.com/Products/57/A3750_FIRE-SAFE_HomeOffice_Safe

Go to the Sentry safe website, http://www.sentrysafe.com/CustomerCare/Find_Your_Safe and click on "lost your combination" and they should be able to help you retrieve yours.

To close and lock

You can relock the safe in two ways. With the door

closed, depress the key lock (if equipped) with your

finger, or spin the combination dial one full turn.

For greatest security, do both. (Make sure the door
handle is in the horizontal position.) There is a link to the manual at the bottom of this page...
http://www.sentrysafe.com/Products/380/SW3750_Electronic_FIRE-SAFE_

The combination is generally printed on the front of the owners manual along with the serial number and model number (sticker).

If you do not have the owners manual.. or managed to open the safe.. then lock the manual inside .. and did not register your product via their website..

Then you must contact Sentry and provide them with a notarized letter stating you are the owner.. the notary cannot have the same last name as the owner.. etc etc... all the specific requirements are listed on their website.

www.sentrysafe.com

Just clik on the Customer Care Button..and the Lost Your Combo Button to get the details.

If you registered the product..following these same instructions will allow you to log in and retrieve your combination.

Best of luck

Go to the sentry website and they will give you instructions on resetting the safe. Also you probably can download that whole manual there.