Pendragon Sailing Posted January 26 Share Posted January 26 Here’s a new one for me….8 Pin decoder all successfully installed into a brand new Bachmann Fairburn 2-6-4T, with the 2MT sound profile loaded and working. Sound volume set at 35.Everything running fine, THEN the without any obvious cause, the sound started to distort - all crackly and hissy.I’ve re-loaded the 2MT sound profile, same distortion. I then loaded the Class 08 sound file to be sure it wasn’t the 2MT file causing the issue……same distortion. I’ve swapped speakers several times…same distortion. I then removed the decoder from the loco onto my Test-Board to check it wasn’t the loco’s PCB causing the problem….same distortion.Any thoughts on what might be happening here or what I might do to resolve? Link to comment Share on other sites More sharing options...
SteveM6 Posted January 26 Share Posted January 26 Its not unheard of for the speakers to fail if overstressed. Contact Hornby Customer Services and they will replace it. Link to comment Share on other sites More sharing options...
LTSR_NSE Posted January 26 Share Posted January 26 I’d initially suspect speaker too, however if same distortion is present on multiple speakers, I’d suspect a fault with decoder’s amp was more likely the culprit. Either way contact George & ask his advice for what to return. Link to comment Share on other sites More sharing options...
Pendragon Sailing Posted January 26 Author Share Posted January 26 Thanks Chaps.I’ve just emailed George W.I suspect the amplifier too, although what might have caused it remains a mystery.Let’s see what he says. Link to comment Share on other sites More sharing options...
Britannia Builder Posted January 26 Share Posted January 26 I wonder if the speaker socket has come loose on the circuit board? I think there have been previous reports of this.Regards, John Link to comment Share on other sites More sharing options...
Pendragon Sailing Posted January 26 Author Share Posted January 26 Good point BB……I’ll check that out. Link to comment Share on other sites More sharing options...
ColinB Posted January 26 Share Posted January 26 I did have this happen on a TTS, I only noticed it was that badly distorted when I bought another one off Amazon because they were doing a deal. I eventually sent it back to Hornby for a replacement. Normally it is the speaker, or as I found with HM7000 the supply voltage not being high enough but there is some electronics that can go wrong. Link to comment Share on other sites More sharing options...
96RAF Posted January 26 Share Posted January 26 Make sure the speaker driver and enclosure are sealed as air leaks with cause crackly sound. A smear of silicone sealant is ideal as it can be removed later if necessary. Link to comment Share on other sites More sharing options...
Pendragon Sailing Posted January 26 Author Share Posted January 26 I’ve tried four different speakers, two hornby supplied and two from Roads & Rails…..I don’t think its the speaker (they can’t all be faulty) Link to comment Share on other sites More sharing options...
Pendragon Sailing Posted January 26 Author Share Posted January 26 I wonder if the speaker socket has come loose on the circuit board? I think there have been previous reports of this.Regards, John No, the speaker socket connection looks sound, so (probably) not that. Link to comment Share on other sites More sharing options...
Pendragon Sailing Posted January 26 Author Share Posted January 26 I wonder if the speaker socket has come loose on the circuit board? I think there have been previous reports of this.Regards, John No, the speaker socket connection looks sound, so (probably) not that. Link to comment Share on other sites More sharing options...
Pendragon Sailing Posted February 10 Author Share Posted February 10 Quick update. Hornby have now replaced this decoder; the previous one having developed a fault in the sound chip. Link to comment Share on other sites More sharing options...
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