Problems with S&G 2740B

[MartinHewitt]

I do have here a 2740B from a friend. It was made in 2018 and was basically a NOS. I have also one and no issues with it, but this one is making me (and him) problems. Calibration to 0 works. Opening with 50-25-50 results in an error (single brap) and more sooner than later gives the 10 minute delay. It is unlikely, that someone changed the combo to something else, but possible. So I tried the recovery procedure too. I got also an error (single brap) after I dialled the serial. I rechecked the serial and it is the same in the cover and next to the bolt. It is probably impossible that someone changed the serial. So any idea what I could try to get it working?

[Squelchtone]

Hi Martin,

You could try to call or email S&G technical support. I am not sure if they will talk with you unless you are an authorized S&G reseller.

Squelchtone

[MartinHewitt]

The chances, that S&G will help me as a non-US, non-government person are probably zero.

PS: Connector looks good. Will try to remove the battery for a while.

[MartinHewitt]

Recalibrated dial multiple times.
Checked dial orientation.
Checked connector pins.
Checked serial number.
Removed, waited, reinserted batteries.

An attempt to dial 50-25-50 results always in an error and after multiple times in a 10 minute wait.
An attempt to dial the recovery procedure does often result in an error after dialling the serial, but sometimes the 3 beeps before the serial won't happen and the lock is then generally unresponsive until there is after a minute or two a brap.

I don't think there is anything left I could try.

[MartinHewitt]

Put in my dial and got it open at the second attempt. So it is possibly a mechanical problem. The spacing of the numbers does not that even on both dials. Or maybe I am dialling to fast. I'll try a few things.

[MartinHewitt]

I get the lock reliably open with 49 3/4 - 25 - 49 3/4 to 48 3/4 - 25 - 48 3/4. And the 25 in the range of -/- 1/4. Recovery combo works with slight modifications too. Great, that this lock is not borken.

And here a photo of the dial


Spacing is different on his and my dial.

[MartinHewitt]

The calibration of this lock stored precisely by the position of 0. But the combination seems to be stored as numbers evenly distributed around the dial. So directly opposite of 0 is 50. When I set a new combination and dial there 50 it detects, that it is a 50 and puts the center of this 50 directly opposite of 0. So I could dial perfectly to 50 while setting the combination, but the center was always of. The original, true 50 was 48 3/4 - 49 3/4 on this dial. When I set the combination to 50 it became to the lock 51, which was on this dial 49 3/4 to 50 3/4. To have a usable, better centered combination I changed the 51-26-51 back to probably a true 50-25-50 and changed instead the calibration to about 0 1/2. The serial doesn't work for recovery with this tweak. This lock costs nearly a thousand dollars and they can't make an evenly numbered dial. A week ago this was my favorite electronic lock. Now, I am not so sure. Maybe this botched dial explains, why they are so rare and the X locks so common.