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Decoder Powers Up But Doesn't Respond ?
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 Posted: Fri Jul 19th, 2019 12:35 am
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Eric T
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I'm having trouble with a brand new Soundtraxx TSU-2200.

I suspect that I wired something wrong,
and I'm hoping you guys can help me determine which wire(s) are in error.


I know the red and black wires are correct,
because the blue LED shines through the shrink wrap. 

However, it won't respond to address 3,
nor is it producing any sound.

I tried unharnessing the decoder and swapping in an identical model,
and it's giving me the same results.


I'm able to control another locomotive on the same track,
and JMRI it says it can't detect the decoder,
even after manually entering its information.


Can you tell me which wires might be crossed or shorted to produce this behavior?


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 Posted: Fri Jul 19th, 2019 01:16 am
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NathanO
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Do you have some resistors?

With the decoder out of the loco,
hook up a 1K resistor to the motor leads,
and the pick up leads to the program track.

See if JMRI sees the decoder.

Nathan


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 Posted: Fri Jul 19th, 2019 07:14 am
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2foot6
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With decoders you need to have a load connected,

the load being the motor.


If not connected you cannot read or program the decoder.


I know all this because it caught me a few years ago.


.....Peter


:doh:




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 Posted: Sat Jul 20th, 2019 05:31 am
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Eric T
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I checked the manufacturer's parts page today,

and found that there's a board with resistors already connected to the motor.


https://estore.bachmanntrains.com/images/On30_parts/10123-PCB01.JPG


:bang:


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 Posted: Sat Jul 20th, 2019 06:29 am
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2foot6
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Eric,

The red/black, as you stated, go to the track/wheels pick up.

The orange/gray go to the motor, that must be connected (not just the board).


If that doesn't work you may have a faulty decoder.

Do you have another decoder, to plug or wire in, as a comparison?


...............Peter.




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 Posted: Sat Jul 20th, 2019 08:15 am
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corv8
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Eric,


Before tinkering with an $$$ sound decoder,

I usually put one of my cheap Lenz standard decoders in the chassis,

and run the loco a few minutes.


Sometimes there is a hidden bug that is easier to discover this way...


Two times I have fried a sound decoder,

because a headlight wire has touched the metal body.




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Gerold
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 Posted: Sat Jul 20th, 2019 06:23 pm
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Eric T
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I did some poking around with my continuity tester,
and found that the tender plug was miswired.


Seems that the pinout isn't the same as the contact arrangement,
which led to the rail and motor wires being crossed. 

:f:

I corrected the wiring and the sound and headlight now work,
but the backup light and motor don't respond.

Those two functions do still work when I touch the wires to batteries,
so I know they aren't fried.


Oh well, time to order decoder #3...


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