kg4guy Posted March 18, 2010 Share Posted March 18, 2010 I pulled 2 of these out of my old Pioneer A-X30 amp and it has 3 leads on it one is longer than the other two is this other for stability to hold it on the board better as it doesn't appear to be in the circuit on the board? Quote Link to comment Share on other sites More sharing options...
JL Sargent Posted March 18, 2010 Share Posted March 18, 2010 That picture is kinda tough. Other than sectoral type capacitors I have not seen them with more than two leads. It would be interesting to know if "structural leads" are sometimes added to larger ones. Quote Link to comment Share on other sites More sharing options...
kg4guy Posted March 18, 2010 Author Share Posted March 18, 2010 Hard to get a clear photo however when I test it with my meter I get noting when I touch it and one of the shorter leads only when I touch the smaller leads do I get a reading. Quote Link to comment Share on other sites More sharing options...
kg4guy Posted March 18, 2010 Author Share Posted March 18, 2010 Says 4700uF 35v thats all? Quote Link to comment Share on other sites More sharing options...
WMcD Posted March 18, 2010 Share Posted March 18, 2010 I was thinking along the lines of md. That was the way it was with the big old cans in old equipment. But. 1) You say the long post is not connected to anything on the circuit board, 2) There seems to be no electrical effect of the long post. It is not electrically connected internally 3) The label has only one value. Therefore I'd have to say it is just a single cap in there. - - - - From the value and size, this is most probably a polarized electrolytic cap. There may or may not be some marking indictating which of the short posts is the plus, or minus. In any case, the long post should make it possible to insert it in the circuit board in only one orientation. Therefore the long post is a mechanical way of preventing the assembler from putting it in backwards. Just my bright idea for the evening. I don't know from any spec sheet. But it makes sense. Wm McD Quote Link to comment Share on other sites More sharing options...
kg4guy Posted March 18, 2010 Author Share Posted March 18, 2010 That is a very good point about the long post and a very good way of preventing a cap from blowing up. Anyway I have put new caps in just haven't plugged it in yet maybe I will take it out in the back yard and plug it in and let it set for a while? Quote Link to comment Share on other sites More sharing options...
djk Posted March 18, 2010 Share Posted March 18, 2010 It looks like an idiot proof capacitor, even an idiot can't put it in backwards. Asia came up with an idiot proof 9-pin SIP as well, you can't put it in backwards. Quote Link to comment Share on other sites More sharing options...
WMcD Posted March 18, 2010 Share Posted March 18, 2010 Fool proof? Yes! Idiot proof? No! Quote Link to comment Share on other sites More sharing options...
Marvel Posted March 19, 2010 Share Posted March 19, 2010 It could be an assumption that you already have a schematic, but here it is anyway. Bruce Pioneer-AX30 amp.pdf Pioneer-AX30 amp.pdf Quote Link to comment Share on other sites More sharing options...
kg4guy Posted March 20, 2010 Author Share Posted March 20, 2010 Wow thanks Bruce I looked all over for that couldn't find it. Quote Link to comment Share on other sites More sharing options...
Mike Dubay Posted March 21, 2010 Share Posted March 21, 2010 On the lower right hand section of the schematic, just after the power transformer it is capicators C135 and C136. It forms the +28 and -28 voltage section. If you don't have two caps in that position, then it is more likely a dual section capacitor. Quote Link to comment Share on other sites More sharing options...
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