TaffsTT Posted December 29, 2023 Share Posted December 29, 2023 Hi,Purchased a TT120 A4 (William Whitelaw in a non HM7000 set).Purchased a HM7000 Next18 chip, and fitted.However, sound comes on but when it starts to go, it cuts out (like its a short or something as connection also gets lost to app).Worked fine on dc before and when I restore loco back with a blanking chip.Any ideas or issues encountered with this chip / loco combo please thst might help me?Cheers Link to comment Share on other sites More sharing options...
96RAF Posted December 29, 2023 Share Posted December 29, 2023 Have you updated the sound profile to the very latest TT version (currently v2.0) as early versions had a stop/go problem, later fixed. Link to comment Share on other sites More sharing options...
TaffsTT Posted December 29, 2023 Author Share Posted December 29, 2023 96RAF,I think so. Link to comment Share on other sites More sharing options...
96RAF Posted December 29, 2023 Share Posted December 29, 2023 Nope - SD999 is the decoder factory default. You need SD038 for a TT A4.Go to profiles and scroll along until you get to it then select your decoder ID from the drop down. Install as usual.If you try to do it from loco settings >> select profile it may crash or hang or not. Either way whatever works for you. Link to comment Share on other sites More sharing options...
TaffsTT Posted December 29, 2023 Author Share Posted December 29, 2023 Thankyou 96RAF. Will try now tomorrow. Link to comment Share on other sites More sharing options...
TaffsTT Posted December 30, 2023 Author Share Posted December 30, 2023 Hi all again. So SD038 profile loaded onto loco and same issue exactly. Link to comment Share on other sites More sharing options...
LTSR_NSE Posted December 30, 2023 Share Posted December 30, 2023 @TaffTT - check to ensure you are fully seating the decoder in the socket (you should feel & hear a ‘click’ when correctly installed.)If that is already the case, then your issue sounds remarkably similar to the following thread:https://uk.hornby.com/community/forum/r1255m-and-8txs-bluetooth-disconnects-375842?ccm_paging_p=3#end-of-replies(only difference is Next18 decoder rather than 8 pin.)Seeking assistance from the developers by emailing: hm.customercare@hornby.com might therefore be advisable. Link to comment Share on other sites More sharing options...
TaffsTT Posted December 30, 2023 Author Share Posted December 30, 2023 If that is already the case, then your issue sounds remarkably similar to the following thread:https://uk.hornby.com/community/forum/r1255m-and-8txs-bluetooth-disconnects-375842?ccm_paging_p=3#end-of-replies(only difference is Next18 decoder rather than 8 pin.) Tried that thanks - just in case but the same happens. The fault above is exactly the same issue!! Link to comment Share on other sites More sharing options...
TaffsTT Posted December 30, 2023 Author Share Posted December 30, 2023 Uploaded a video of issue to my YouTube channel here: Link to comment Share on other sites More sharing options...
Daedalus Posted December 31, 2023 Share Posted December 31, 2023 That does not look right. My WW will creep, I have decreased the acceleration rate to 140 well below the default.Only swapping the tenders with your other A4 will provide further diagnosis or ring Hornby.It's either the decoder or motor/chassis but which? Link to comment Share on other sites More sharing options...
LTSR_NSE Posted December 31, 2023 Share Posted December 31, 2023 @Daedalus - according to OP it works correctly on DC which suggests that motor/chassis are working correctly. Link to comment Share on other sites More sharing options...
Daedalus Posted December 31, 2023 Share Posted December 31, 2023 That's a very bold statement. It rather assumes the decoder outputs the same waveform as the DC controller. Link to comment Share on other sites More sharing options...
LTSR_NSE Posted December 31, 2023 Share Posted December 31, 2023 No assumptions regarding decoder waveforms or specific faults were intended in my post.I was only suggesting that if the loco performs correctly, reliably and demonstrates faultless behaviour, when run on DC - then a socket/decoder issue appears more likely than a motor/chassis one.However it is certainly not impossible for an intermittent motor/chassis fault to only appear under very specific conditions. Link to comment Share on other sites More sharing options...
TaffsTT Posted January 5 Author Share Posted January 5 Thanks all. The decoder has now been sent back for quality checks and the loco been returned too so will update you all.with any progress / results. Link to comment Share on other sites More sharing options...
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