William Whitelaw issue with Next18 HM7000

[TaffsTT]

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

[96RAF]

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.

[TaffsTT]

96RAF,

I think so.

[96RAF]

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.

[TaffsTT]

Thankyou 96RAF. Will try now tomorrow.

[TaffsTT]

Hi all again. So SD038 profile loaded onto loco and same issue exactly.

[LTSR_NSE]

@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.

[TaffsTT]

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!!

 

 

[TaffsTT]

Uploaded a video of issue to my YouTube channel here:

[Daedalus]

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?

[LTSR_NSE]

@Daedalus - according to OP it works correctly on DC which suggests that motor/chassis are working correctly.

[Daedalus]

That's a very bold statement. It rather assumes the decoder outputs the same waveform as the DC controller.

[LTSR_NSE]

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.

[TaffsTT]

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.