richard Posted October 16, 2007 Share Posted October 16, 2007 Hello We have some rather old green ginger install dimmers which are a little d o d g y. Gradually the ways are going and we are needing to fix or repair them. Each module is either four 2kw channels (4 small heatsinks) or two 5kw channels (2 big heatsinks) which slot into the rack itself. I have some spare 5k modules but could do with some spare 2k modules if anyone has any. Otherwise does anyone know how to fix broken channels. They appear to have just locked on at full. Changing out the module fixed the problem so it is not just a demux/cable problem. Any thoughts would be appreciated. Thanks Richard Link to comment Share on other sites More sharing options...
musht Posted October 16, 2007 Share Posted October 16, 2007 Sounds like classic triac failure, not expensive or difficult to fix. Link to comment Share on other sites More sharing options...
boswell Posted October 16, 2007 Share Posted October 16, 2007 I repaired a couple of channels of the 2kw version, all parts or equivalents are easily available from CPC,Maplin, RSC. Info on parts available on the net.Easy to fault find with a scope! Unfortunately I do not have a circuit diag, only a part one I drew until I found the fault, (dry joint on pulse transformer) Link to comment Share on other sites More sharing options...
boatman Posted October 16, 2007 Share Posted October 16, 2007 Sounds like classic triac failure, not expensive or difficult to fix. Either that or a sync detector failure. A typical sync detector used an opto-isolator or transistor in series with a 100k 2W carbon film resistor. The latter has a habit of going open circuit. If any have, then replace them with a 100k 2W metal-film and you should be up and running again. Link to comment Share on other sites More sharing options...
richard Posted October 17, 2007 Author Share Posted October 17, 2007 Thanks for the info guys. Sadly I am not too hot with an osciliscope, but will have a look and see what I can see. If there is anyone in London who would like to earn a little $$ to fix these then do let me know! Thanks Richard Link to comment Share on other sites More sharing options...
oilyspark Posted October 18, 2007 Share Posted October 18, 2007 not too hot with an osciliscope, but will have a look and see what I can see. Hopefully you won't need one. Check with power off and load disconnected for continuity across the triac main terminals. If shorted, you probably won't need to look any further. Link to comment Share on other sites More sharing options...
richard Posted October 19, 2007 Author Share Posted October 19, 2007 Hello all Thanks for all the help! Brian is going to take them all away and service for me, so hopefully all will be well!! Thanks ichad Link to comment Share on other sites More sharing options...
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