Re: Ampliphone HV revisited

Remove and test the resonating capacitor (C8? Hard to read schematic.
 It's the capacitor connected across the emitter/collector of the BU406D).

Christopher X. Candreva wrote:

>I'm finally getting back to the Ampliphone HV board I was fixing back in
>January. Reviewing quickly:
>
> o Monitor was blowing +24 reg and BU406D.
>
> o Replaceing both, reg now gets very hot and BU406D blow again
>
> o With BU406D out, +/- 24 checks, Waveform at 555 checks out
>
> o All other transistors / SCR check out
>
> o Replaced the brown jumper with wire -- no change.
>
>What was left was the Wintron and the red can. I've since tried Tom
>McClintock's replacement of 3 10mh inductors in a triangle -- still blows
>the BU406D, and reg's get very hot. (I've added a 1.5a fust to the +v
>input, didn't blow this time).
>
>My LOPT tester came yesterday, spent a late night last night building it --
>and the Wintron rings fine.
>
>So what's left is starting to swap parts with my working ampliphone --
>something I don't relish doing as I don't want two dead Wintron's and/or
>MC1's on my hands. That, and takeing out every other resistor, cap, etc and
>testing them.
>
>I am open to suggestions at this point.
>
>-Chris
>
>==========================================================
>Chris Candreva -- chris@westnet.com -- (914) 967-7816
>WestNet Internet Services of Westchester
>http://www.westnet.com/
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Received on Sun Apr 6 15:36:51 2003