Jon Gwinnett Posted November 11, 2010 Share Posted November 11, 2010 My new Bachmann 105 runs perfectly (if a little noisily) in DC But in DCC it shorts out the moment its placed on the track. I'm using a Bachmann 36-553 decoder. I've tried a second decoder and the same thing happens. Any ideas? Link to post Share on other sites More sharing options...
Guest Max Stafford Posted November 11, 2010 Share Posted November 11, 2010 Try pulling out the decoder plug from the socket very slightly. It's not unknown for the prongs to come into contact with an inadequately insulated area of the chassis block beneath. Dave. Link to post Share on other sites More sharing options...
Jon Gwinnett Posted November 11, 2010 Author Share Posted November 11, 2010 No joy. Now with one decoder it shorts instantly. With the other there is motor noise but no control, movement or otherwise. Not a dead short any more though. Confused! Link to post Share on other sites More sharing options...
Jon Gwinnett Posted November 11, 2010 Author Share Posted November 11, 2010 Realised I didn't thank Max in the previous post - apologies. Have given up and decided I'll take it back and swap it tomorrow if the shop has any left. I was feeling really pleased at having got the body off without any damage too. Tried taking off the cast weight to see if I could see any shorts. Big mistake - the cardan shaft slipped out of the motor which is fixed to the weight, not the chassis and lifts off as you lift the weight off. However its all back together, no evidence of any shorts inside and runs again on Dc . Have reassembled and will sleep on it. Link to post Share on other sites More sharing options...
muddys-blues Posted November 11, 2010 Share Posted November 11, 2010 Daft question, have you got a decoder in both cars ? or just the power car ? If you have got decoders in both cars, have you tried putting one car at a time on the track to see which car is causing the problem, and have you tried something else on the track you are using to check the problem is not on the track. Best regards Craig. Link to post Share on other sites More sharing options...
Jon Gwinnett Posted November 12, 2010 Author Share Posted November 12, 2010 Hi Craig. Tried my newly chipped 03 on the track - no problems at all Was only trying the power car - hadn't started the trailer. Thanks for the suggestions. Link to post Share on other sites More sharing options...
muddys-blues Posted November 12, 2010 Share Posted November 12, 2010 Hi John, have you tried the power car on DC with blanking plug back in the chassis ? Link to post Share on other sites More sharing options...
ScRSG Posted November 12, 2010 Share Posted November 12, 2010 OK Jon, the problem has been solved and appears to be a one off. D&F (specifically Dave)have found a mis-soldered joint on the underside of the eight pin DCC socket which connected two pins together, these had no effect on DC operation but resulted in voltage being applied from pickups to the "wrong end" of the chip! Once this had been tidied up unit ran perfectly with chip. Unfortunately the first chip was fried! I would hope and be reasonably sure that the replacwments will be ok, both unit and chip. Took some time but we got there! Yet another challenge sorted!!!! Link to post Share on other sites More sharing options...
Jon Gwinnett Posted November 12, 2010 Author Share Posted November 12, 2010 OK Jon, the problem has been solved and appears to be a one off. D&F (specifically Dave)have found a mis-soldered joint on the underside of the eight pin DCC socket which connected two pins together, these had no effect on DC operation but resulted in voltage being applied from pickups to the "wrong end" of the chip! Once this had been tidied up unit ran perfectly with chip. Unfortunately the first chip was fried! I would hope and be reasonably sure that the replacwments will be ok, both unit and chip. Took some time but we got there! Yet another challenge sorted!!!! D&F were excellent as always - first class customer service gents. I will try the new one in the next few minutes and report back. Glad you found a fault TBH - was worried it was me! Dare I ask how long you and Dave spent looking at it? I'll bin the other chip I tried -likely it fried that as well. The two replacements today will sort that. At the risk of sounding sycophantic, this is the joy of dealing with a proper model shop! Cheers chaps. Link to post Share on other sites More sharing options...
Jon Gwinnett Posted November 12, 2010 Author Share Posted November 12, 2010 Hi John, have you tried the power car on DC with blanking plug back in the chassis ? Yes we tried that. No problems at all on DC, only on DCC - as Scrsg says, its been explained now. Thanks for taking the trouble to help out. Link to post Share on other sites More sharing options...
ScRSG Posted November 12, 2010 Share Posted November 12, 2010 Took a while, Dave did all the work, I as usual, knocked off sharpish! Link to post Share on other sites More sharing options...
Jon Gwinnett Posted November 12, 2010 Author Share Posted November 12, 2010 Delighted to say there's no problem with the replacement. Link to post Share on other sites More sharing options...
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