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La Gard Reset Box

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MartinHewitt

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Post Sun Jun 14, 2020 8:24 pm

La Gard Reset Box

Finished my La Gard reset box project. The reset box can reset without knowing the Management Code nearly all La Gard electronic safe locks, when there is direct access to the lock. It is not usable to open a locked safe!

I have attached the schematics of the original La Gard reset box and a rebuilt one. Instead of the original parts I used two 10kOhm resistors, the next best npn transistor and a standard diode. Working perfectly. There are descriptions about its use online. Don't ask me.

Now I only need a La Gard without known PIN.
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GWiens2001

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Lock-Goblin-Gordon
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Post Sun Jun 14, 2020 10:05 pm

Re: La Gard Reset Box

Thanks for posting. Will have to make one. Keep from having to disassemble and jump.

Gordon
Just when you think you've learned it all, that is when you find you haven't learned anything yet.
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Anarchy_won

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Post Sun Jun 14, 2020 10:51 pm

Re: La Gard Reset Box

Great work MartinHewitt. I dont have a La Gard to test it with but if I run across one I will let you know how it go's.
(17:44:28) HAL 9000 Sez: LockSport is full of children who throw fits because low priced low security products sold in discount department stores do not meet their arbitrary expectations.
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least

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Post Mon Jun 15, 2020 6:56 pm

Re: La Gard Reset Box

Hi,
I assume the diode is there to allow the reset-box to power up the lock in case its battery died... Depending on the operating voltage range of the lock, the schottky diode might make a difference if the battery of the reset box would be low - this type of diode has much lower (roughly less than half) forward voltage drop, compared to usual diodes, so the lock might get almost 0.5V more with the schottky.
Kind regards,

Michal
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MartinHewitt

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Post Mon Jun 15, 2020 8:26 pm

Re: La Gard Reset Box

The battery of the reset box is the only battery connected to the lock. See instructions of the La Gard reset box. The purpose of the diode is IMHO only to protect against doing wrong connections. For the operation it is not important if there is none, a Schottky or a normal diode. With a normal diode the battery looks maybe a bit more used than with the Schottky, but it will work also with a bit more used battery and the voltage is regulated inside the lock.The reset box is also not connected for months.
In case you wonder ... Martin Hewitt is a fictional detective in stories by Arthur Morrison:
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