- Vivitar 3500 "zoom thyristor" flash won't whine - 1 Update
- Zenith SF3537H modules wanted - 2 Updates
| Peabody <waybackNO584SPAM44@yahoo.com>: Oct 12 05:03PM -0500 abrsvc says... > OP may provide details, but I supplied transistors to > him and as of this writing, one is working by changing > transistor and some caps. Yes, thanks very much, Dan. I found that one of the two ganged transistors had failed short. So I replaced that one with one of Dan's 2SB324 transistors, and I replaced the two electrolytic capacitors, one of which tested bad for ESR. And now it works. I have two more of these flashes which still work, but don't always spin up when I first turn on power. I'm going to make sure their transistors are good, but I'm going to replace their capacitors. The existing ones are 35 years old, so it's not too soon to replace them. They are Panasonic CE series, which don't appear to have been anything special. Thanks for bailing me out, Dan. I was thinking of trying to switch over to silicon transistors, but at least for now I don't have to do that. These flashes run on two NiMH AAs, so about 2.4V, so the lower base drop of germanium may actually be important. Anyway, I was not looking forward to making that transition. |
| Chuck <chuck23@dejanews.net>: Oct 12 12:10PM -0500 >Zenith never wanted board level repairs on them. Just module exchanges. >-bruce >bje@ripco.com It was PTS. At one point, they had offices in most major US cities. Thomson bought RCA, not Phillips. |
| John-Del <ohger1s@gmail.com>: Oct 12 01:07PM -0700 On Monday, October 12, 2020 at 1:10:53 PM UTC-4, Chuck wrote: > >bje@ripco.com > It was PTS. At one point, they had offices in most major US cities. > Thomson bought RCA, not Phillips. Also, PTS started out as Precision Tuner Service. There were a dozen or more similar companies in the U.S., like Castle Tuner Service. They started out servicing mechanical tuners, then electronic tuners, then expanded to TV modules. PTS still exists as a recycler that sells used boards: https://www.ptselectronicsinc.com/ |
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