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Dr Gerbil-Fritters

DCC problems with a MM071

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Guys,  I've had no problems so far with any MM071... but number 80 is turning into a bit of a dog.

I fitted a loksound5, and although the sound and lights work fine, she runs intermittently, and stalls completely (killing sound and lights) frequently.  It's not registering as a short on my Powercab.

In DC mode, she'll run fine for a bit then suddenly slow right down and run as if on half speed.  

I've checked the other locos, and swapped chips around - it doesn't seem to be a problem with the new chip or a track power problem...  On stationary test, it'll run fine, so it doesn't seem to be a pick up problem.  The problem only appears once the loco is moving freely.

Perplexed, and a little annoyed as I can't figure it out myself.  

I also can't work out how to get into the mechanicals, I've had the bonnet off to get the chip in, and accidentally half removed one of the truck side frames, but I wonder if its a problem with the grease around the wheels/gears/pick ups.... grabbing at straws really.

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