Hi there,

I hope someone can help me with my configuration and the setup of a Marklin 7286 turntable (10y) with a recently bought 7687 digital retrofit kit in ebay and CS1 with Rocrail.
I connected the kit with the turntable. Have power on tracks but can't seem to move the turntable. Before that it worked fine with the conventional command.

I setup the turntable with address 225, type ttdec and Protocol Motorola.
Do i need to adjust some other setting, even for getting to the next track?

I have a Rocrail version of last week and my CS1 obviously got the last fw from Marklin, a decade ago! ... but it's working with everything in Rocrail.

Thanks.
Pedro.

Hi Pedro
A 7286 user here but with a different decoder (DSD2010) a CS3 and Rocrail.
No you don't need to use a different setting to drive your decoder (if it works fine)
If the 7286 was a 2nd hand, open the case and check the soldering bridges (It is the unit configuration)
On the Märklin website I could only find the 7287 manual here https://static.maerklin....876e4b34bc1574773383.pdf
So IMO using address 225 is very fine
In Rocrail you have to decide or set:
- if the bridge block is embedded or not (not in my case). This means that somewhere on your plan, you need to add a block named DS1 with its one sensor in your case

- the Turntable (TT) interface looks like this

One difference is the sensors in the red frame. You should use only sensor 1
The other is the type (TTDEC in your case, instead of dsd2010)

- the TT track definition looks like this

The key is to decide where is your Track 0 on your TT (this will be the reference for RR). RR order in COUNTERCLOCKWISE
Also key is, for each line to make a correspondance between the track # (from 0 to 47) and the order to be sent to your decoder 7687
The position sensor can be skipped with a simplified decoder

One important thing to remember is that the command is incremental. Meaning: for the first use the position must be manually set on the bridge (pushing the black lever towards the center of the bridge and rotating the bridge to its RR position.
This is the little I know about using a 7286 TT with Rocrail
Here is mine in total automatic operation by Rocrail

I hope this helps
Cheers
Jean

Thanks Jean for your wonderful reply.
I've seen other topics from you about the turnout.



In the meanwhile i was able to start the programming with an old 6021 + 6040 ((separated from the layout, so without CS1 and without Rocrail).
I'm able to program it but after ending the program the turntable doens't move anymore, nor with the step or turn keys nor with the number of the memories.
This is a different problema. I followed, several times, the manual and i just can't use it after programming.
So Jean i haven't tested the TT again in Rocrail because it must work outside Rocrail first.
It can be the 7687... but it's strange that the programming is done ok (i think!) and afterwards i can't use it.

Pedro.

It could be that the 7687 is faulty and won't take programming - maybe that is why it was sold. I know there were circumstances where these were reported to lose their programming. I don't know how it saves its configuration.

It may be better to get an LDT TT-DEC which is functionally equivalent to the 7687 as a minimum, and has some extra features as well. If you are handy building electronics then it can also be obtained as a kit (second item on this page, fully built up is third item). The kit requires the plastic body to be purchased seperately.

Thanks Ross, will try that when i get home.

Pedro.

Jean,



One never knows. sometimes we are doing something wrong and are not able to correct it easily. However i made the programming sequence several times. The TT makes the warning bips when starting the programming, accepts the steps < > when programming the tracks and accepts the "end" of programming with the expected beeps. Afterwards it doesn't move, nor with the memories (numbers), nor with Turn or Steps.
I'll try Ross solution this evening.

Pedro.

Hi Pedro,

The problem you describe is the same as others have had and the fix seemed to reset the decoder to operating status.

Hopefully you will have the same success.

Read my article on programming the turntable it may be of help.

Thank you very much for all the help.
Unfortunally @Ross the fix is not working. There is no feedback from the TT after aplying the Prog (bip sounds) -> 24 -> End. Nothing happens, nothing moves with step/turn.

@Jean, i have no leds connected to the decoder but when i start the programming in the first 5 seconds, it beeps. Then i go to position 1 and hit clear and then go thru the needed steps for positioning the other tracks, hiting input at each one. As i see on the manual, input is the same as prog (the initial key for programming in the first 5 seconds). At the end i hit "end" and the TT goes back to the first position, as expected. Then no more moves with step/turn or memories.

I tried also what @blid wrote, about hitting step before ending the programming. Also nothing after going back to the first position.

I'm doing this with the old control unit and a keyboard (15).

TT is ok with the original command.

EDIT: As i'm still testing, i'm not connecting a second transformer to the L connector, i'm just using the red output from the Control Unit to power the TT. Altought it's not adviced in the normal use, i think that for testing purposes it's the same. Am i wrong?
Like seen on this page:

Hi Pedro,

Good to know you have sorted the operation of the turntable out, well done.

Having well thought out questions with accurate information always helps people trying to give the correct answers.

For you and others the wiring information for the different turntable decoders is on pages 12-14 of my article below

7686 and 7687 turntable setup

Link corrected 31-12-2024

You may find other tips that will help operating your turntable.

Edited by user 31 December 2024 00:07:29(UTC)  | Reason: Not specified

You're welcome.
I don't use the old turntable much in my current layout, except as track loop to change ride direction. Note that old railroad crossing motors also use analog AC, which can be connected to the same (white) transformer as the turntable (yellow+common ground).

Hi Pedro

Embedded block (in the TT)
When you right click on your TT symbol, in "general" tab on center left you don't click on "embedded block"
RR wiki says "The turntable itself act like a block object and does not need an external bridge block."
So I selected to have a block represented separately with its sensors.

You wrote "in the TT i have the tracks programmed, now in rocrail i have to adjust those memories to the position of the tracks in the track layout by using the TT -> Tracks and them fill in the "decoder track" for each track?"
I don't know much your decoder but what is key is:
- to pick a track 0 (your choice) and then going counter clock wise, you have tracks from 0 to 47
- what RR wants to know is what code your TT decoder is expecting for it to drive the TT to T1...T47
- For RR to understand and get this info, you must fill the Track table" and especially the row "decoder track"

Lets take an example track 1 is the first track for your decoder (RR calls it Track 0)
Because you are not using all the tracks the next used track for your decoder is Track 2 but it is located on Track6 of you physical TT , so you write on line 6, in the field "decoder track" the value 2 (it is track 2 for your decoder) and so forth for all tracks you use (generally much less than the 48 positions.
I hope this helps
Jean