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Post by loudigrazia on Oct 15, 2012 15:01:28 GMT -8
I have an HO Atlas GP40 with their dual-mode decoder that I'm attempting to switch back to regular DC for another modeler. I moved the jumper plug back to the DC position, and the loco runs but the front headlight will not light. On my DCC layout both headlights work fine with the decoder in DCC mode, so I know it's not a bad bulb or loose connection. Any ideas? Thanks.
Lou DiGrazia
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Post by bnsf971 on Oct 15, 2012 16:03:55 GMT -8
Bad connection on the jumper plug? Try turning the plug 180 degrees, and put it back in. The plug also may not be in all the holes.
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Post by Bill Nielsen on Oct 20, 2012 4:33:32 GMT -8
Hi Lou,
Before you switched the plug, were the lights switched on & working? On some decoders (not sure about Atlas), if the lights are switched off in DCC mode, they will also stay off when running on DC. Perhaps a quick shot of DeOxit or other cleaner on the plug would help, if it's an oxidation/contact problem.
Bill in FtL
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Post by Jens Wulf on Dec 23, 2012 5:50:44 GMT -8
late reply  anyway, the mode plug (DC/DCC) affects only the power pickup to motor connections. The lights are always fed by the dual-mode-decoder, and hence on DC that decoder needs to have the alternate power mode enabled (DC mode), or in other words, CV29=4, or 6, or 38 etc. And further, you need to make sure that the decoder truly understands the DC mode, as some analog power produce pulsed waveforms the decoder may misinterpret as digital (and then as "bad digital") |
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