Xls In Lgb Brunig 21470

[PhilP]

I have recently fitted an XLS decoder in one of these, using the 10-pin interface on the existing board..

This works, but 'something' is getting in the way of being able to read/write to the decoder..
This means I have to open the loco, disconnect the 10-way, and bodge track/motor leads to read/write to the decoder. - Will be a problem for the Owner, as he did not want a volume control fitted.

Is there a way round this? - All I can think of is to take track-power directly to the decoder (as well as the LGB board?) and see if this works..
TIA,
PhilP.

 

[stockers]

not a power buffer in there, is there?

 

[PhilP]

not a power buffer in there, is there?

Not that I can see.. Unless anyone knows better that LGB built them into/onto some of their boards??

 

[idlemarvel]

I had a similar problem with one of the new Trix/Maerklin decoders, I couldn't read or write to it. This thread lists various suggestions from forum members. In the end I tried a different command station (Lenz) and it worked.
https://www.gscalecentral.net/threads/marklin-lgb-decoders-and-jmri.300339/#post-356984

 

[PhilP]

Thanks for that Dave..
This is a different problem. An 'ordinary' Massoth decoder, which will respond to command requests, but not to CV reading / writing requests. - Have tried with lights and sound turned OFF as well.
I have to disconnect the 10-pin from the LGB board in the loco, and plug track / motor direct.

This is on both a Didgitrax, and Massoth DCC setup.

 

[Greg Elmassian]

That proves that you have something else "across" the rails when it is installed, you should be able to see this with an ohm meter with the decoder removed.

Greg

 

[stockers]

That proves that you have something else "across" the rails when it is installed, you should be able to see this with an ohm meter with the decoder removed.

Greg

Tend to agree with that.

 

[PhilP]

Whilst I agree with you Greg, this is the first time I have had this problem, with a 'standard' LGB internal board..
Could it 'just' be the internal regulator / smoothing on this board is pulling all the current when initially trying to program / read? - There is only power for a very short (no pun!) time..

I will 'open her up' this morning, and have another look for anything 'extra'.
Will check a few CV's whilst I can get at the decoder.
Will perhaps try either a resistor across the track, or in series with one lead. - Never sure which is supposedly the correct method.

 

[idlemarvel]

In parallel I think; if you have in series you will drop voltage. The purpose of the resistor is to simulate some load and draw some current I believe.