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Offline Drongo  
#1 Posted : 24 October 2019 05:30:17(UTC)

Joined: 03/06/2008(UTC)
Posts: 1,021
Location: Sydney, NSW
Hi Everyone,

Whoever designed the Turntable (7286) to be used with decoder (7687) must be a very sadistic "person" - not allowed to use bad language on the forum.

Anyway, I'm having nightmares trying to get things working - sometimes they do and mostly they don't. The instructions are written for people who know what to do, NOT to instruct people who don't know. The TT & decoder are so temperamental that it's beyond a joke. I have 2 decoders (7687) and both have failed on me i.e. they work for awhile and then they die. Either I've wired it up incorrectly or the product is cheap rubbish. The latter I feel as it's typical of Marklin's electronic products.

Can someone please direct me to a video with the instructions (in English, please) so that I can get the TT working. Also, can someone recommend an alternative decoder to the 7687 which is far more reliable.

Take it easy . . . . or any other way you can get it !!!!
Website - www.simplesite.com/gregstrain
Offline JohnjeanB  
#2 Posted : 24 October 2019 12:06:09(UTC)

Joined: 04/02/2011(UTC)
Posts: 578
Location: Paris, France
Hi Greg

I don't have the 7686 decoder but I read a number of complains about its implementation and memory problems
On my 7286 TT I have installed a DSD2010 decoder made by DigitalBahn. It is sophisticated and IMO the most powerful one.
It allows
- up to 3 rail sensors on the bridge to detect locos position
- 2 speed control of rotation
- optical sensor for TT position (no more klac klac noise when reaching a track
- it can drive 4 signals, cabin lighting, flashlight, sound all digital controlled.

It is made of 2 decoders: one under the bridge ("Bühne")and one outside ("Grube")
It is sold as a kit with all SMCs (Surface mounted components) already wired). The cost is 135€
The manuals can be downloaded here:
- user's manual https://digital-bahn.de/shopping...sd2010_anleitung_1v7.pdf
- installation manual https://digital-bahn.de/shopping...010_einbau_anleitung.pdf
- all other documentations (wiring instruction, test protocol, etc https://www.digital-bahn.de/bau_ds2010/dsd2010_doku.htm

The configuration and diagnostic software can be download (no charge) here https://www.digital-bahn.de/bau_ds2010/exe/dsd2010_070.exe
The changes to be made to the TT are:
- the removal of the electromagnetic latch / solenoid
- the addition of the opto-sensor for the bridge rotation
- the wiring of signals (optional)
- the plugging of a SUSI sound module (optional)

This is an excellent product (the best IMO) BUT
- the instructions are in German
- the wiring of the bridge is delicate
- the decoder connection to the PC is using an RS232 link so if your PC doesn't have one you need a USB/RS232 converter

You may see the result here in automatic operation using Rocrail

So in short it is an ambitious project that is worth the while.

My lay-out videos
latest vid
humping yard
thanks 1 user liked this useful post by JohnjeanB
Offline DaleSchultz  
#3 Posted : 24 October 2019 14:42:45(UTC)

Joined: 10/02/2006(UTC)
Posts: 3,124
Hi Greg,

correct the decoder is an awful product.

I used a K84 module instead - which I describe here: https://cabin-layout.mixmox.com/2004/12/Digitizing-turntable-7286.html
Intellibox + own software, K-Track
My current layout: https://cabin-layout.mixmox.com
Arrival and Departure signs: https://remotesign.mixmox.com
thanks 1 user liked this useful post by DaleSchultz
Offline PMPeter  
#4 Posted : 24 October 2019 17:36:11(UTC)

Joined: 04/04/2013(UTC)
Posts: 987
Location: Port Moody, BC
I use the LDT TT-DEC-G decoder for mine and am very happy with it.
Offline French_Fabrice  
#5 Posted : 24 October 2019 19:04:10(UTC)

Joined: 16/05/2011(UTC)
Posts: 1,234
Location: Lyon, France
Same as Peter, I use the LDT TT-DEC.

Read the doc here: http://www.ldt-infocente...ungen/ttdec_06_13_en.pdf and see if it's more understandable.

Offline Drongo  
#6 Posted : 08 November 2019 12:25:15(UTC)

Joined: 03/06/2008(UTC)
Posts: 1,021
Location: Sydney, NSW
Thanks fellas for the advice. I ordered LDT TT-DEC and it arrived today. All I need is a quiet few hours with no interruptions and I'll give it a go.

Take it easy . . . . or any other way you can get it !!!!
Website - www.simplesite.com/gregstrain
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