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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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672D Capacitor Spec? (In 2465B)
While scraping together enough parts to satisfy the DigiKey $25 order
threshold (sans $5 service charge), I decided to open up my 2465B and see which electrolytic caps were in the PS section (which appears to be soft, as I previously posted). I was able to track down replacements for most of them, but I'm stumped on three other types. Two of them are 672D series, the other 39D. All three appear to have United Chemi-Con logos. More specifically: 1. 672D150 - 250uF, 20V, 105C 2. 672D? - 180uF, 40V, 105C 3. 39DX1314 - 290uF, 200V Both the 672D and 39D were Sprague series, but I'm not sure if they were the same as these UCC caps. Neither Vishay/Sprague nor UCC have any information about either series on their websites (Vishay has a U673D series, presumably a lead-free version of the 672D, except that they are all radials, whereas at least one of the 672Ds in the scope is an axial). I googled six ways from Sunday and came up empty, though I found a cross-reference on the Illinois Capacitor site (672D - RZS if radial, TMA if axial), and worked backwards to UCC series RZ (radial) or KME-T (axial), Nichicon PZ (radial), and Panasonic NME (axial). Of course these last four may have worse specs than the Illinois caps and perhaps the 672D as well. An actual spec for the original caps would settle the matter, but I can't locate that either. Any other suggestions for determining what cap(s) would be suitable replacements? Just get the lowest-ESR, highest ripple 105C axial that will fit? One more thing - none of those three capacitance values are available in the axials I found; closest are 330uF and 220uF. How critical are the values in the 2465s supplies? Thanks, TM |
#2
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672D Capacitor Spec? (In 2465B)
On Dec 3, 9:20 pm, wrote:
While scraping together enough parts to satisfy the DigiKey $25 order threshold (sans $5 service charge), I decided to open up my2465Band see which electrolytic caps were in the PS section (which appears to be soft, as I previously posted). I was able to track down replacements for most of them, but I'm stumped on three other types. Two of them are 672D series, the other 39D. All three appear to have United Chemi-Con logos. More specifically: 1. 672D150 - 250uF, 20V, 105C 2. 672D? - 180uF, 40V, 105C 3. 39DX1314 - 290uF, 200V Both the 672D and 39D were Sprague series, but I'm not sure if they were the same as these UCC caps. Neither Vishay/Sprague nor UCC have any information about either series on their websites (Vishay has a U673D series, presumably a lead-free version of the 672D, except that they are all radials, whereas at least one of the 672Ds in the scope is an axial). I googled six ways from Sunday and came up empty, though I found a cross-reference on the Illinois Capacitor site (672D - RZS if radial, TMA if axial), and worked backwards to UCC series RZ (radial) or KME-T (axial), Nichicon PZ (radial), and Panasonic NME (axial). Of course these last four may have worse specs than the Illinois caps and perhaps the 672D as well. An actual spec for the original caps would settle the matter, but I can't locate that either. Any other suggestions for determining what cap(s) would be suitable replacements? Just get the lowest-ESR, highest ripple 105C axial that will fit? One more thing - none of those three capacitance values are available in the axials I found; closest are 330uF and 220uF. How critical are the values in the 2465s supplies? Thanks, TM Hi Tim, I fix these all the time. The 330uf is what I prefer to use @50vdc for all the 220uf caps (actually 35vdc will work). Be sure they are 105c or they will not last. Change all the 220uf caps and the 100uf closer to the transformer. You can actually swap the 100uf caps if they are not bad. The one I am talking about gets a lot of stress because it series couples the -15 to make the -8 unreg. The other one is just a filter and never fails. The rest of the caps do not fail often. |
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