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STTS Decoder Problems

Chrissaf

12053 posts


Community Moderator

I opened a Hornby 8 pin docoder today and one wire wasn't soldered at all and doesn't look like it ever was. So much for quality control at Hornby.

 

@ArmyMedic

Just to add to Rog (RJ)s cryptic reply.

 

The Hornby R8249 [as do many other brands] has 9 wires connected on the decoder, but there is only 'as standard' an 8 way connector plug. This means that one wire [the purple / mauve one] has to be free and un-terminated as there is no connector pin spare for it. This wire is the fourth function wire and is switched negative by sending an F2 command from the controller. The wire can be used for any suitable use within the loco. For example a Cab Light.

 

The other three functions are Function 1 & Function 2 which are the 'Directional Lighting' functions controlled by F0 on the controller. The third function is the decoder 'Green' wire [Pin 3] on the 8 way connector and controlled by sending F1 from the controller.

 

Therefore it is not a 'Quality Control' issue. The decoder is designed that way and they are all the same.

 

Note: None of this information is applicable to the TTS decoder to which the original post relates. It is only applicable to four function 8 pin decoders such as the Hornby R8249.

 

Chris........ Making the wood in the trees visible.

RAF96

13830 posts


Community Moderator

@armymedic

As suspected it seems like an H-bridge half failure. Send them back under the no-quibble TTS warranty.

 

As Colin said we only hear about the few duff ones, not the tens of thousands of good 'uns.

Halton Brat - Running Win 10, 64-bit - RM (Pro-Pack) with Elite as Controller-A, Select as Walkabout and E-Link as Controller-B - Locos are mostly TTS. http://www.halton96th.org.uk/robs_rails.html

ArmyMedic

9 posts

@Chrissaf

I opened a Hornby 8 pin docoder today and one wire wasn't soldered at all and doesn't look like it ever was. So much for quality control at Hornby.

 

@ArmyMedic

Just to add to Rog (RJ)s cryptic reply.

 

The Hornby R8249 [as do many other brands] has 9 wires connected on the decoder, but there is only 'as standard' an 8 way connector plug. This means that one wire [the purple / mauve one] has to be free and un-terminated as there is no connector pin spare for it. This wire is the fourth function wire and is switched negative by sending an F2 command from the controller. The wire can be used for any suitable use within the loco. For example a Cab Light.

 

The other three functions are Function 1 & Function 2 which are the 'Directional Lighting' functions controlled by F0 on the controller. The third function is the decoder 'Green' wire [Pin 3] on the 8 way connector and controlled by sending F1 from the controller.

 

Therefore it is not a 'Quality Control' issue. The decoder is designed that way and they are all the same.

 

Note: None of this information is applicable to the TTS decoder to which the original post relates. It is only applicable to four function 8 pin decoders such as the Hornby R8249.

 

Cryptic isn't the word I'd use but thanks for your explanation but it wasn't the mauve wire. I have managed to the solder the culprit back on and it works ok fortunately. I bought three 8 pin docoders.

I have decided to ditch the Hornby Select in favour of the NCE Power Cab. The reviews from other modellers were good. I doubt I will ever have a huge layout, so it should last me a while. The locomotives are going back for a refund.

If it fits, wear it

yelrow

4168 posts

Use it as a Walkabout, and buy an Elite.

Use Windows 7, only, On french version of windows. Run RM, with Elite. DCC layout, Large DC, and 3 Rail layouts. Also, TT, and N Gauge

ColinB

1464 posts

I had an interesting one today. My Duke of Gloucester that I bought new  two years ago came with sound fitted, I decided to run it. It runs for about one loop and then the sound stops, intially after about another loop it stopped but it seems to have stopped doing that after I played around with everything. It comes back with a reset. So I rewired the socket and a fitted new socket  and changed everything, except the motor. Still it does it. Even if I put one of my spare TTS decoders in it, the same happens. I eventually fitted the decoder to a diesel and it works perfectly. So the only thing left is the motor. All the pickups are perfect, what I will do tomorrow is swap the tender with another Cornation class loco. Obviously, there is something with this loco does not like TTS decoders. Oh and I checked for capacitors and inductors, not even any around the motor. I even changed DCC controllers and it still happens. I have my suspicions what it is, but at the moment it is guess work. 

RAF96

13830 posts


Community Moderator

Sounds like the decoder is self protecting from an overload. Motor drawing marginal amps perhaps.

Folk have reported decoders not working after a long lay off, but they wake up again after a reset and readdress and continue to work fine thereafter.

Halton Brat - Running Win 10, 64-bit - RM (Pro-Pack) with Elite as Controller-A, Select as Walkabout and E-Link as Controller-B - Locos are mostly TTS. http://www.halton96th.org.uk/robs_rails.html

ColinB

1464 posts

@RAF96 funny that was what I was thinking it might be, but thank you for the advice. The decoder also must have an issue with its recovery strategy, in that it comes back with no sound. I will run it around the track for about half an hour an see if it recovers, if not I will try one of my Zimo sound decoders in it and see if I get the same issue. They have a much higher current cutoff, so the issue might disappear, in which case long term I will replace it with one of those. Trouble is, I probably only tested over a length of track when I bought it so it could always have done it. This is one of the few occasions where a small capacitor across the motor might help.

sg43

2 posts

Thanks for all the replies.

Can I ask  - how do you get notified of a response to your post? - I only noticed this by chance today,  as I have yet another TTS Decoder problem, but seems like I generated a lot of dicussion. 

As a treat, my wife got me the Flying Scotsman R3736 Empire exhibition livery.  Fitted an A1/A3 decoder and it worked fine until Saturday when it suddenly started jerking and stopped, though the sound was still there. 

Have replaced the analogue blanking plate and converted back to DC - I have an old R965 analogue controller and the Flying Scotsman came back to life, so assume there is a problem with the TTS decoder and not the loco itself.

 

 

 

 

 

Chrissaf

12053 posts


Community Moderator

Can I ask  - how do you get notified of a response to your post?

 

You Don't. There is no auto notification feature on this forum. I suggest when you raise a post that you come back and check each hour for new replies. Note that sometimes additional useful replies are still left days after you think that your question has been answered. So it is useful to come back and check at least once daily for a week to be absolutely sure that your thread has come to a natural ending.

Chris........ Making the wood in the trees visible.

howbiman

2747 posts

@sg43..........to get back to your original problem running the TTS decoder.........I would suggest that you change CV150 by calling it up on your Select (V2.0) and Writing a value of 1........this will change an algorithym and vastly improve the loco's smooth running..........this tweak has been recommended 100's of times now..........HB

Do you know who I am?..........No, but I'm sure Matron does!

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