Yes, I have 9 locos programmed ok - and have changed some of those to make sure the programming is working OK which it is.

John

Thanks but unfortunately this doesn't work.
Having input Point Loco 8 Preset 8 Enter R
The 511 responds with " No response received" or Found  - 3-------(.
However if I then try and reprogram from 3 to another number,   The 511 does not detect it!

I now have some 9 locos like this, and short of buying new decoders, I do not know what to do. ANy further ideas please?

John

I have a ZTC control system with Bachmann 36-552 decoders in the locos.   Over time a number of the decoders have ceased to be recognised at all by the controller ( and when I get the controller to scan for the Loco cv, it fails to "see" it.  I have read elsewhere that I need to instal an isolation switch between the controller and track that should be opened whenever the layout is powered up or down to prevent the scrambling of the decoders and I obviously need to do this urgently!

My question is how can I recover/reset the decoders if the system will not even recognise the loco cv?  Can they be reset at all? Or will I have to buy ned decoders (ouch!)
Thanks
J