Is there a slot for the cab switch? The switch is part of the circuit board. Perhaps someone removed the board. Mine works great, but it is very sensitive to pure DC voltage change to go to uncouple mode. I have never tried this loco on pulsed power and it may not work on pulsed power. Hopefully someone running pulsed power can respond to this question.

 

I am ATM using pure DC mostly LGB controllers

Is this switch mounted vertically?

NO switch in the cab but what looks like a slot for one :-(

I will take the loco apart and do some pictures and psot ASAP

thanks

 

Update

WELL where to start.

First the cab was not held on by the two screws into the main chassis and was only being held on by the engine cover.

NO switch but a slot for the switch covered up by some double sided sticky tape.

Getting the top off was easy only two screws holding the front engine cover one , rotate that up and the cab came with it.

UNDERNEATH was a RATS NEST of wires and boards.

Seems we have a Lenz LE230 DCC controller on board.

Looks like this was not a professional install as it all looks like a dogs breakfast.

OWELL :-(

see pictures

thanks

 

Perhaps this diagram could help in understanding the duo wiring.


http://www.beathis.ch/lgb/21900/21900.html

And if you do not have this, the original duo manual which no longer applies due to the conversion.
https://www.trainli.com/USER-GUIDE-PDF/New LGB Engines/lgb-21900-user-guide.pdf

And the original control board from modell-land.de
21900-E157


LGB service diagram/cable wiring diagram for the 21900
http://www.onlytrains.com/manuals/21900-1.pdf

 

Thanks again

I have the manual both the user manual and the service one

 

More info

After digging deeper it looks like the uncoupling may/will work on a DDC system

It looks like the wee board at the front sitting on multi-layers of double sided sticky tape is a Lenz Function module LF200

DIGITAL plus with 3 isolated function relays outputs are isolated from decoder function inputs Used to interface decoders with sound systems, lighting, signals, switch
machines or other on/off devices that require more current than the decoder
can supply


Each function relay operates a maximum load of 1A


All connections are designed as screw terminals


Compatible with NMRA DCC decoders of all brands.


Size: L 1.6" x W 1.22" x H .47"
L 40 mm x W 31 mm x H 12 mm

http://www.lenzusa.com/1newsite1/Manuals/le230.pdf

http://www.lenzusa.com/1newsite1/Manuals/lf200.pdf

thanks