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Why does this old Spectrum loco run away? It's not the decoder.
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<P mce_keep="true">Ok, this is a cheap old pre-owned split-frame Spectrum GP30. But it is in pristine shape and a very quiet runner for a Spectrum.</P> <P mce_keep="true">But ever since the first decoder install (NCE D13SR) it has run away forward when simply set on a powered track, throttle on brake. If I move the throttle to forward and then move up a notch, the initial fast runaway sometimes ceases and it responds to the throttle setting, but back to fast runaway when the throttle is turned down to zero.</P> <P mce_keep="true">I can bring it to a halt by switching the throttle to reverse. Then the forward setting will work properly until the loco is once again removed from the track and then set down again on a powered track. The situation returns to runaway at zero froward throttle setting and/or on brake.</P> <P mce_keep="true"><EM>Now here's the odd part.</EM> It is not the decoder. I just replaced the NCE with an old Bachmann Lenz decoder and to my infinite surprise, the darned thing ran away exactly in the same way</P> <P mce_keep="true">What I have done:</P> <P mce_keep="true">Cleared all loco settings in my Zephyr</P> <P mce_keep="true">Set the NCE to DCC only setting</P> <P mce_keep="true">Tried both decoders at various addresses</P> <P mce_keep="true">checked for odd wiring/continuity with my meter.</P> <P mce_keep="true">Could it possibly be in some glitch in the motor? This was never a DCC loco so it has no Bachmann cap.s or diodes.</P> <P mce_keep="true">If it didn't run so smoothly I would break it up for parts.</P> <P mce_keep="true">Thanks for any experience with this.</P> <P mce_keep="true"> </P>
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