ColinB Posted April 6, 2023 Share Posted April 6, 2023 No the other pin on the two pin connector didn't go to pin 4 on mine. Definitely got continuity on the other pin to pin 8. I must admit as it is my very expensive HD Sir Nigel Gresley I gave up at that point. I did notice that the tender pickups are hard wired to the board it might be that this connector was meant for the tender pickups but at the last minute they found out that there was a fault with the board so ditched it. There again I cannot think what L+ and L- stand for, L is normally short for inductor but I have no idea. Loudspeaker is normally SP so it is not that. Link to comment Share on other sites More sharing options...
Brew Man Posted April 6, 2023 Share Posted April 6, 2023 L certainly is the usual symbol for an inductor, and that there are two, L+ and L- suggests maybe a suppression circuit in play. Is that a possibility? Link to comment Share on other sites More sharing options...
Fishmanoz Posted April 6, 2023 Share Posted April 6, 2023 If it were a suppression circuit without the inductor fitted, the rails supply would be open circuit as suppression inductors are in series in the track supply. The opposite to suppression capacitors which are in parallel. Link to comment Share on other sites More sharing options...
96RAF Posted April 6, 2023 Share Posted April 6, 2023 L could be lights as in running lights for a steamer, cab lights for a diesel or firebox flicker or smoke unit or link to some other device in the tender. When the designer gets back we may get an answer. Link to comment Share on other sites More sharing options...
Jon-350572 Posted April 6, 2023 Share Posted April 6, 2023 RAF,do we know when the designer is back? Link to comment Share on other sites More sharing options...
ColinB Posted April 6, 2023 Share Posted April 6, 2023 Yes Fishmanoz you are probably right but on the pcb there are several surface mount component positions not populated so it could be in series. Similarly it could be for lights again because of the missing components I wouldn't have found a link to the pin on the DCC socket. I must admit L for lamp makes more sense. Link to comment Share on other sites More sharing options...
96RAF Posted April 7, 2023 Share Posted April 7, 2023 RAF,do we know when the designer is back? No as my contact has gone on holiday too. Try again after Easter. Link to comment Share on other sites More sharing options...
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