mkt
New Member
Posts: 1
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Post by mkt on Mar 14, 2021 7:45:44 GMT -8
I am not new to installing DCC chips. But recently I installing a TSU/sound. Worked except when I hit the horn or bell function the loco stalls momentarily then picks back up. Any suggestions?
Thanks.
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Post by edwardsutorik on Mar 15, 2021 6:45:32 GMT -8
1.) Maybe those two events draw slightly more power because they're "louder", and there's a bad electrical connection that's then showing up. Seems EXTREMELY unlikely. Until it happens.
2.) More likely to me is an extremely weird decoder. You can replace the one that's being that way with another (hopefully not matchingly weird*) and see if that fixes the problem. If it doesn't, there's a problem with your wiring.
3.) And then there's the one you're probably asking: is there some goofy programming thing going on here that I can fix with the proper CV. Beats me. Since the thing you're seeing is hardly typical programming, it seems wiping the decoder and re-programming might work. That may be the first choice, since you don't have to do lotsa work. I HAVE heard that sometimes you've got to do the wipe several times to get it to stick.
3a.) I HAVE received a fresh decoder-equipped locomotive that came with not-usual programming. And I did end up wiping it and reprogramming. And then it behaved.
Ed
* The best way to do this is to pull a decoder that you KNOW is working well from another locomotive, and pop it into the one with the problem: FIXED? "bad" decoder. NOTFIXED? bad loco (wiring). Of course, there's a third option: When you changed decoders, you joggled the bad wire connection enough to temporarily fix it. So when the loco runs well, you think it was the decoder. A proper test of that would be to put the potentially bad decoder into the now empty sacrificial loco. And see what happens.
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Post by Mark R. on Mar 15, 2021 7:29:37 GMT -8
Try turning the volume way down and see if the problem persists.
Mark.
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Post by edwardsutorik on Mar 15, 2021 7:56:26 GMT -8
Try turning the volume way down and see if the problem persists. Mark. Good one!! Ed |
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Post by canrailfan on Mar 16, 2021 19:14:21 GMT -8
Have you tried other sound functions (couple/uncouple, short horn, cab chatter, etc.) to see if they also affect the loco speed?
If this is a PNP or 21-pin format decoder go over the board with a strong magnifying glass and look for stray bits of solder (spatter) or wire clippings bridging component leads or stuck between two components. Not bridged solder joints but where a wire clipping or solder spatter may have landed on the board during installation.
It's happened to me twice over many installs. Removing the solder or wire clipping fixed the decoder both times.
(Solder spatter should be removed by picking it off with the tip of a knife blade. Don't use a soldering iron as you may damage the component connection to the board.)
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Post by Mark R. on Mar 17, 2021 20:25:01 GMT -8
Where'd the OP go ?
Mark.
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Post by bnsf971 on Mar 18, 2021 2:33:22 GMT -8
He was online here yesterday. |
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