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Opening instructions for a Sentrx A3817 - Sentry Fireproof Safe

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I have the key and combination to my safe, but haven't open it in a while, is there a battery that can be changed?

Posted on Jan 08, 2013


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Posted on Jan 02, 2017


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I desire the default code for my older model a3817, I can not locate the information.

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2 Answers


1. Hold the "receiver" with the open end up.
2. Insert the small spring in the opening.
3. Insert the fuse in the opening.
4. Place the metal ring atop and around the opening with the "sharp" edge of the ring down and the smooth surgace of the ring up. The fuse should now be protruding thru the metal ring.
5. Place the chrome "tip/cap" atop the fuse end.
6. Place the black plastic part over the chrome "tip/cap" with the black plastic part's threads going toward the receiver opening and push the black plastic part's threaded end through the opening in the metal ring and into the receiver opening and screw it in fairly tightly.
7. The chrome "tip/cap" should now protrude through the end of the black plastic part and everything should now be securely held in its proper place.
8. You should now be able to press your finger down on the "tip/cap" and it should depress slightly and then spring back when you release it. If that works you should be able to plug it in to the car's cigaraette lighter opening and connect your Garmin GPS.
9. Last but not least: EVERY time you remove the GTM 20 from the cigarette lighter opening you should check to make sure that the black plastic part with the threaded ends (the part that's holding everything in it's proper place) has not loosened. If you don't check this religiously you are likely to end up losing one or more of the parts I've just discussed.
DO NOT be tempted to glue that part in place as the fuse may blow someday which will require you to replace the fuse.

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