Still learning about digital. I have 14 of a larger collection of Marklin locos that have a "Model Tronix Digital" sticker on the Marklin box. In the list of loco addresses my late father has prefixed each address with MT (Model Tronix) suggesting to me that there is something different about the decoder in these locos.
I have a Piko and Fleischmann loco with this sticker on the box and these work perfectly with a 6021 controller with dip switches 1,2,3 on and 4 off.
All the Model Tronix Marklin locos do not respond at all. I have tried the 6021 dip switches 1,2,3 on 4 off ; 2 on 1,2,3 off; and 1-4 all off. Absolutely no response at all . Pressing Function does nothing, no lights.
I have tested 12 of these locos so I think it is unlikely this is anything other than a decoder and user issue. There is probably a simple explanation.
All of the non Model Tronix digital locos work perfectly on the same layout.

I think the Model Tronix digital aftermarket digital replacement /modification probably happened in South Africa.

Has anyone seen this. I don't really want to have to send them all to Marklin.

Edited by user 23 August 2015 22:48:30(UTC)  | Reason: Watch topic, spelling

Model tronix digital is for industry.
They produce weigh controller in digital.

Thanks for the replies
Yes they are definitely not industrial weighing controllers.
6 of the locos are indeed in boxes that are not digital and clearly these have been converted.
The other 6 that don't work are in Marklin Digital HO boxes, I suppose they may have been repaired at some point.

The Piko and fleischmann are digital locos.

A couple of the boxes have LokPilot/Loksound leaflets in them suggesting that ModelTronix is/was a company and fitted LokPilot decoders.

It is very odd that NONE of the Marklin locos work.

I think I will send one or two to Marklin, I am not yet experienced enough to fit my own decoders.

Edited by user 23 August 2015 22:49:17(UTC)  | Reason: Not specified

I hope these get attached

The few locos I have opened all have similar decoders.

I guess I will have to learn how to do it.

Don't do that yet, there are a goodly few of us in the UK with digital experience.

But having said that, I don't recognise those decoders either.

Is the decoder from Minitrix or Trix?

Could it be "Model Tronic" ??

My friend Google tells me that there is a Spanish company by that name, and also that they once produced a diesel sound unit for H0.

EDIT: I see now the sticker which clearly says "Model Tronix".

Per.

HO, thank you.
When I first read your General Advice, I thought , no I wired the tracks correctly and everything else has been running anyway. Fortunately I checked.
I feel like rather an idiot.
With the greatest humility thank you to all who have replied.

I will still try to find out what the decoders are.

These decoders were locally made in Johannesburg, South Africa and seem to be unbranded. I gather they are not that good and it is extremely difficult to make any changes to them. Most users who had them have had other, better decoders installed.

Now I just need to find someone in the UK who installs decoders.