Midiverb ii issues?
in [Repair]
|
Prev: Concepts in Federal Taxation 18E Higgins 2011 ISM is available for purchase at affordable prices. Contact me at allsolutionmanuals11[at]gmail.com to buy it today.
Next: Dell W3000 aka LG W3000i vertical stripes on display
From: Arfa Daily on 28 Jul 2010 09:22 "JW" <none(a)dev.null> wrote in message news:ht1056l7egepmdrn9epm4ddkabbr3iquel(a)4ax.com... > On Tue, 27 Jul 2010 12:52:09 +0000 (UTC) Meat Plow <mhywatt(a)yahoo.com> > wrote in Message id: <pan.2010.07.27.12.52.02(a)hahahahahahahah.nutz>: > >>On Mon, 26 Jul 2010 13:35:24 -0700, El Grillo wrote: >> >>> Thank you everyone for your help! >>> >>> I will try to work out some of the issues tomorrow at the shop. >>> >>> Also, if a filter cap tests good using a ESR meter, could it still be >>> bad?? >> >>If there is a doubt, sub it. As far as I'm concerned if it passed the ESR >>test it's good (for the time being) > > Well, it could be shorted. Somewhat rare for electrolytics IME, though. In the past, I have seen many electrolytics that were serving as rail decouplers, that have gone short. The little purple 10uF's that Panasonic used to litter everything that they built with, were favourites for failing short. As you say, doesn't seem to be as common an occurrence these days as it once was, though. Interestingly, I had a s/c electrolytic just today (see my post regarding some Restek speakers). It was one of those brown plastic 'Siemens' types that you used to see a lot of in Grundigs and B&O's. Arfa
From: Michael A. Terrell on 28 Jul 2010 17:18 Arfa Daily wrote: > > "JW" <none(a)dev.null> wrote in message > news:ht1056l7egepmdrn9epm4ddkabbr3iquel(a)4ax.com... > > On Tue, 27 Jul 2010 12:52:09 +0000 (UTC) Meat Plow <mhywatt(a)yahoo.com> > > wrote in Message id: <pan.2010.07.27.12.52.02(a)hahahahahahahah.nutz>: > > > >>On Mon, 26 Jul 2010 13:35:24 -0700, El Grillo wrote: > >> > >>> Thank you everyone for your help! > >>> > >>> I will try to work out some of the issues tomorrow at the shop. > >>> > >>> Also, if a filter cap tests good using a ESR meter, could it still be > >>> bad?? > >> > >>If there is a doubt, sub it. As far as I'm concerned if it passed the ESR > >>test it's good (for the time being) > > > > Well, it could be shorted. Somewhat rare for electrolytics IME, though. > > In the past, I have seen many electrolytics that were serving as rail > decouplers, that have gone short. The little purple 10uF's that Panasonic > used to litter everything that they built with, were favourites for failing > short. As you say, doesn't seem to be as common an occurrence these days as > it once was, though. Interestingly, I had a s/c electrolytic just today (see > my post regarding some Restek speakers). It was one of those brown plastic > 'Siemens' types that you used to see a lot of in Grundigs and B&O's. It was very rare with American built electronics. Most failures were open filter capacitors, or damaged 160 mF, 250 V 'Low Power Factor' electrolytics used in the voltage doubler power supplies. BTW, 'Low Power Factor' were rated in the ripple current they could handle. Today, they would be a Low ESR rating. The only shorted electrolytics I remember in American built electronics was the low voltage caps used in the cathode circuits of audio amps.
From: Arfa Daily on 28 Jul 2010 20:56
"Michael A. Terrell" <mike.terrell(a)earthlink.net> wrote in message news:0IadndnEp-heA83RnZ2dnUVZ_h2dnZ2d(a)earthlink.com... > > Arfa Daily wrote: >> >> "JW" <none(a)dev.null> wrote in message >> news:ht1056l7egepmdrn9epm4ddkabbr3iquel(a)4ax.com... >> > On Tue, 27 Jul 2010 12:52:09 +0000 (UTC) Meat Plow <mhywatt(a)yahoo.com> >> > wrote in Message id: <pan.2010.07.27.12.52.02(a)hahahahahahahah.nutz>: >> > >> >>On Mon, 26 Jul 2010 13:35:24 -0700, El Grillo wrote: >> >> >> >>> Thank you everyone for your help! >> >>> >> >>> I will try to work out some of the issues tomorrow at the shop. >> >>> >> >>> Also, if a filter cap tests good using a ESR meter, could it still be >> >>> bad?? >> >> >> >>If there is a doubt, sub it. As far as I'm concerned if it passed the >> >>ESR >> >>test it's good (for the time being) >> > >> > Well, it could be shorted. Somewhat rare for electrolytics IME, though. >> >> In the past, I have seen many electrolytics that were serving as rail >> decouplers, that have gone short. The little purple 10uF's that Panasonic >> used to litter everything that they built with, were favourites for >> failing >> short. As you say, doesn't seem to be as common an occurrence these days >> as >> it once was, though. Interestingly, I had a s/c electrolytic just today >> (see >> my post regarding some Restek speakers). It was one of those brown >> plastic >> 'Siemens' types that you used to see a lot of in Grundigs and B&O's. > > > It was very rare with American built electronics. Most failures were > open filter capacitors, or damaged 160 mF, 250 V 'Low Power Factor' > electrolytics used in the voltage doubler power supplies. BTW, 'Low > Power Factor' were rated in the ripple current they could handle. > Today, they would be a Low ESR rating. > > The only shorted electrolytics I remember in American built > electronics was the low voltage caps used in the cathode circuits of > audio amps. Interesting. I wonder why the difference ? A few years back - say 10 or so - I would have said that I saw as many short circuit electrolytics, as any other problems with them such as open circuit, low value, leaking, bulging etc. Now though, short circuit is comparatively rare. As to cathode caps, I think that I have probably seen more that were open circuit than short. Used to be a big problem in the frame output and audio output stages of TV sets, back in the day ... Arfa |