LeroyOZ Posted March 2, 2010 Share Posted March 2, 2010 Hi everyone, I bought a Dbx 1231 EQ unit from the states and plugged it into my Australian 240 volt mains. I have bought other Dbx gear with switching power supplies, alas, this was not. It made a humming noise and then I realised and turned it off. How much damage may I have done and to which parts? Link to comment Share on other sites More sharing options...
Mixermend Posted March 2, 2010 Share Posted March 2, 2010 Have you blown the input mains fuse? All you can now do is to try it again, via an appropriate step down transformer this time. It is not uncommon to see 120 volt US equipment here in the UK - and I have done the same thing, which is really easy, especially when you have standard detachable IEC type mains leads. Usually got away with it - so I hope that you have also! Link to comment Share on other sites More sharing options...
LeroyOZ Posted March 2, 2010 Author Share Posted March 2, 2010 Have you blown the input mains fuse? All you can now do is to try it again, via an appropriate step down transformer this time. It is not uncommon to see 120 volt US equipment here in the UK - and I have done the same thing, which is really easy, especially when you have standard detachable IEC type mains leads. Usually got away with it - so I hope that you have also! Where is the input mains fuse? I can't see one. Link to comment Share on other sites More sharing options...
david.elsbury Posted March 2, 2010 Share Posted March 2, 2010 If it's not obvious, try alongside the IEC connector for a little rectangular removable panel. Link to comment Share on other sites More sharing options...
KevinE Posted March 2, 2010 Share Posted March 2, 2010 The DBX eq's have thermal fuses wound into the mains transformers which will fail if overloaded or put on the wrong voltage. The rest of the unit should be ok, they use ic-style linear voltage regulators that are pretty hardy. Link to comment Share on other sites More sharing options...
LeroyOZ Posted March 2, 2010 Author Share Posted March 2, 2010 The DBX eq's have thermal fuses wound into the mains transformers which will fail if overloaded or put on the wrong voltage. The rest of the unit should be ok, they use ic-style linear voltage regulators that are pretty hardy. Sounds promising. I'll change the transformers and cross my fingers. Link to comment Share on other sites More sharing options...
Mixermend Posted March 2, 2010 Share Posted March 2, 2010 It is always a nuisance to have to use external voltage changing transformers - so replacing the US voltage type is probably a good idea.However, you haven't said whether the unit works when the correct voltage is applied?Easy to test the continuity of the transformer primary winding with a multimeter - this will tell you if any fuse, thermal or normal type has failed. Link to comment Share on other sites More sharing options...
LeroyOZ Posted March 3, 2010 Author Share Posted March 3, 2010 I'm an electronics novice. Could you run me through this test? Link to comment Share on other sites More sharing options...
Andrew C Posted March 3, 2010 Share Posted March 3, 2010 Unplug it, switch on, and check for resistance between the live and neutral pins of the plug with a multimeter. Should read a low, but non-zero value. Link to comment Share on other sites More sharing options...
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