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Soundtrax tsunami tsu-750
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 Posted: Sat Sep 21st, 2013 06:38 am
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nzreg
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I have one of these decoders installed in my Ixion Coffee Pot.
The first decoder was dead on arrival but was replaced by Soundtrax, I installed the second one and programmed it ok.
It runs fairly well except for one thing.
Every so often the loco stops for a second or two then restarts, no matter which speed step I have it set to it takes off like a scalded cat, I then have to throttle it back to the required speed.
If I reset the loco either by turning off the power or removing it from the track it behaves itself again until the next stop.
I am not sure if these stops are caused by dirty track or a fault in the decoder.
I am using the NCE Powercab.
Any ideas?



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 Posted: Sun Sep 22nd, 2013 12:29 am
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Lost Creek RR
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Hi Reg
I had a similar issue with that soundtrax decoder in a Bachmann Gas mechanical. Solved the problem as it was thought that there was in fact two issues.
   1/ That decoder gets very hot so made sure it had plenty of space around it (well as much as you can get) added a heat sink out of a piece of aluminum and drilled holes in the body of the loco to let more air around it.
   2/ We added the capacitor to the circuit ( had been told by some guy that it was not needed) that was wrong.
Now works like a charm. There are some photo's way back in my post that might be usefull.
Trust this is of some help.
Rod.

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 Posted: Sun Sep 22nd, 2013 03:11 am
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nzreg
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Thanks Rod,

Tried the capacitor in the circuit but it makes no difference.
I should mention that the decoder is attached to a large piece of thick brass plate mounted in the roof space of the coffee pot passenger carriage, I have run the CP with the roof off and the decoder stays cool to the touch.
All my other locos run fine on the track without issues, these range from a 4 6 0 to a small diesel switcher.
No matter which speed setting I run the CP on it stops after a few seconds, then restarts itself but at twice the speed, when it stops again it will restart at four times the speed.
If I put it into reverse from this situation the loco once more runs at the set speed until it stops of its own accord then goes into its speed doubling act.
I know the symptoms of dirty track the stopped loco usually requires a small push to get it going again.
I am coming to the conclusion that this replacement decoder is also faulty.:bang:



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 Posted: Sun Sep 22nd, 2013 11:13 am
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nzreg
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Hi Rob,

Your comment re the capacitor set my mind off on another track (excuse the pun) and after further investigation found that I was routing power to the carriage lighting through the decoder.
Normally this wouldnt be a problem but with the low rating on the 750 it must have been enough to cause an overload trip which of course reset itself fairly quickly.
I disconnected the cabin lights and away she went, hopefully no further issues.
I ran the loco for twenty minutes without a hitch.
Many thanks for your help.



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 Posted: Mon Sep 23rd, 2013 01:35 am
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Lost Creek RR
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Great outcome.
Rod

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