1.Did you first add number 15 as keyboard before to program?
2.What version do you have with LDT TT decoder?

Hi Charles,

I am also using the LDT TT decoder (although controlled by PC software instead of CS2).

I noticed that my TT may get out of sync if I forget to switch off the power to the decoder before shutting down my software... I have fitted a small toggle switch for this reason. Same when starting up - first I boot up Cs2 (and in my case PC as well) and then power on the decoder.

Below is extract from manual for programming the TT:

First step is to check that communication is working between CS2 and decoder:

1. Switch-on your digital-layout and the TurnTable-Decoder TT-DEC. If you
want to perform the programming of the TT-DEC via your model railway
software you have to switch-on those and adjust the turntable if required at
first in accordance to the relevant instruction of the software. It is important
that your model railway software supports the Märklin-turntable decoder
7686 because the TT-DEC is compatible to the commands of the Märklin
decoder.
2. Please press shortly 1-times the key S1 which is located at the right side next
to the TT-DEC heat-sink. Now the yellow LED will flash.
3. Send now several times the command >Drehrichtung< (Turning Direction) at
clockwise direction or anti clockwise from your command station or from
your model railway software in accordance to the programming- and control
table (chapter 4.7.). If the TT-DEC has recognized the command after several
sending intervals this will be indicated by a switched-off yellow LED.
4. The TT-DEC will leave the programming mode automatically. All three light
emitting diodes will glow.

And this steps are for actual programming the TT:

1. Press shortly the key S1 2 times. The green LED flashes.
2. Send now the command >Input<. The red LED will be shortly switched-off
and the turntable bridge turns eventually to the last programmed reference track.
3. Turn now the turntable bridge with the commands >Step< (clockwise or anti
clockwise) to the track 1 (reference track).
4. Send now in accordance to the operation instruction of your command
station or your model railway software the command >Clear< or >Clear< and
>Input< to store the position track 1 (reference track). The red LED will be
switched-off shortly.
5. Turn the turntable bridge with the command >Step< clockwise to the next
required track connection. Please consider eventually as well single
opposite track connections.
6. Store the track connection with the command >input<. The red LED will be
switched-off shortly.
7. Prepare further track connections on the same way.
8. If you have completed the programming of all track connections send the
command >End<. The turntable bridge will turn to track 1 (reference track)
and the programming mode will be automatically finalized. If the turntable
bridge will not return to the defined reference track you have to repeat the
programming process.

Brgds - Lasse

I use Marklin 7687 Digital Retrofit Set on 7286 Turntable with using CS2 and it work fine.

Hello Steven.

Would you have the instruction handy for the marlin decoder. Could you e mail/pm them to me.

copy and paste the link into new window.

Hello.

I think I might give that a go. I can get a new one in the UK for £100.

Charles.

I used Dale's solution as well (I also gave up on the Marklin decoder - I suspect mine was faulty out of the box, but too expensive to send back to Germany for repair). You don't need to remove the rectifier from the 7286 controller as Dale did - you can use an appropriately speced purchased rectifier, but just be aware that the pin connections might be different.

The solution works well and is reliable.