RMweb Gold Dougjuk Posted May 9, 2019 RMweb Gold Share Posted May 9, 2019 Hi guys, Need some help from someone who knows electronic stuff. I bought a class 47 chassis to go with the spare 47346 body I had obtained. However this chassis does not have the headlight LED's fitted so I bought the LED's but they will not work because there are a couple of missing parts. Take a look at the photo I am missing the connections at C6 and R6, I have added the second photo of the panel in 47359 with those parts. Can someone ID the bits and where I can get them. regards and thanks Doug Link to post Share on other sites More sharing options...
tractor_37260 Posted May 11, 2019 Share Posted May 11, 2019 Hi Doug C6 a surface mount (SMD) capacitor - unsure how you could find out it's value ? R6 - a surface mount (SMD) resistor 1.5Kohm - (152) - same as the others on the circuit board The New White LED's would appear to be fitted in the 2 holes directly below D and the Blue wire to the terminal left of the Green Wire. The Bachmann 47 unusually has dual common return wires, normally there are only 3 wires on other models - 2 feeds 1 common return. Being so small, these SMD components are not normally sold individually, but available on eBay in multi-strips HTH Ken Link to post Share on other sites More sharing options...
RMweb Gold Dougjuk Posted May 12, 2019 Author RMweb Gold Share Posted May 12, 2019 On 11/05/2019 at 17:02, tractor_37260 said: Hi Doug C6 a surface mount (SMD) capacitor - unsure how you could find out it's value ? R6 - a surface mount (SMD) resistor 1.5Kohm - (152) - same as the others on the circuit board The New White LED's would appear to be fitted in the 2 holes directly below D and the Blue wire to the terminal left of the Green Wire. The Bachmann 47 unusually has dual common return wires, normally there are only 3 wires on other models - 2 feeds 1 common return. Being so small, these SMD components are not normally sold individually, but available on eBay in multi-strips HTH Ken Hi Ken, Many thanks for that, I have found that Bachmann sell the boards but have been quoted £22 inc postage, not sure if thats for the pair or just one. But I have been looking around a couple of spare PCB's from dead locos and found some resistors marked 152 and a few capacitors that look the same size but as you said no markings. I am going to have a go at removing and see if I can install. At leat I have something I can copy and I have spare LED's in case. Once again thanks for the help. Doug 1 Link to post Share on other sites More sharing options...
nimbamoss Posted February 21, 2021 Share Posted February 21, 2021 On 11/05/2019 at 17:02, tractor_37260 said: Hi Doug C6 a surface mount (SMD) capacitor - unsure how you could find out it's value ? R6 - a surface mount (SMD) resistor 1.5Kohm - (152) - same as the others on the circuit board The New White LED's would appear to be fitted in the 2 holes directly below D and the Blue wire to the terminal left of the Green Wire. The Bachmann 47 unusually has dual common return wires, normally there are only 3 wires on other models - 2 feeds 1 common return. Being so small, these SMD components are not normally sold individually, but available on eBay in multi-strips HTH Ken Hi Ken, I know 2 years have passed ince your post, but I have a question if you have a monent to help. The C6 capacitors, are these for the DC operation? Do I need them if as I plan, replace the complete Bachman main board with a Zimo Adaplu board, aand change the wiring setup of the headcode board. Ian Link to post Share on other sites More sharing options...
tractor_37260 Posted February 21, 2021 Share Posted February 21, 2021 Hi Ian If your completely replacing the Bach main circuit board with a Zimo board, therefore using DCC I'd leave the nose end boards as is unless you plan adding headlights if they are missing. I'm not familar with that Zimo board but check if it has any on board resistors for the decoder outputs. If not in-line resistors can be fitted to each output wire Yellow/White etc etc all Blue wires being connected together. Try 1K resistors to start with and check if your happy with the light brightness. Ex factory lights are usually far too bright. HTH Ken Link to post Share on other sites More sharing options...
nimbamoss Posted February 21, 2021 Share Posted February 21, 2021 Thanks Ken, I'll let you know how I fair. Ian Link to post Share on other sites More sharing options...
RMweb Gold Dougjuk Posted February 24, 2021 Author RMweb Gold Share Posted February 24, 2021 I ended up getting a replacement from Bachman and kept the old kit for spares. Doug Link to post Share on other sites More sharing options...
tractor_37260 Posted April 7, 2021 Share Posted April 7, 2021 (edited) On 24/02/2021 at 17:48, Dougjuk said: I ended up getting a replacement from Bachman and kept the old kit for spares. Doug Noticed you managed to get new nose circuit boards. I was working today on an early Bach 47 which also has the headlights missing. I removed the nose end circuit boards and fitted a 1K SMD resistor at R6 along with a capacitor ( I robbed it from an old Bach circuit board) at C6 together with new White LED's - result working headlights with the markers. So it can be done. HTH Ken Edit: The capacitor is not required, just the a new LED and a 1K resistor, works fine without. Edited April 8, 2021 by tractor_37260 Add text Link to post Share on other sites More sharing options...
RMweb Gold Dougjuk Posted April 8, 2021 Author RMweb Gold Share Posted April 8, 2021 Nice job, that's is what I should have done really but my eyesight these days makes it a bit tough. Doug Link to post Share on other sites More sharing options...
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