I think that was my post on EEVBlog. :)
On Sat, Apr 6, 2019, 12:26 PM Bob Albert via Groups.Io <bob91343=
[email protected]> wrote:
I suggest you go to EEVblog and connect with a guy there who has what seems to be the same issue.
As you probably know, HP has no available information on the innards of the doubler.? I repaired mine but it had a different problem.? The factory, even when it was supporting the unit, required that the doubler be returned to the factory for repair or replacement.? I don't know how much they charged for that but I suspect it would have been well over $1000, since the whole generator went for something like $13k.
I think this guy already tried relacing the regulator.? Anyway perhaps between you two a solution can be found.
Bob
On Saturday, April 6, 2019, 6:02:34 AM PDT, <
tcuff65@...> wrote:
I read through a lot of the posts on the 8657b doubler issues, but haven't found any ideas that match my issue.
I seem to have the same issue VE2ZAZ had with his.
When my doubler acts up, a red led lights up inside the doubler, and the -5.2v supply gets loaded down.
Then after a little bit, the led goes out and the -5.2v supply recovers, and all is well again.
There is a power resistor by the 723 regulator that has overheated some.
I'm guessing that the led is tied to that regulator somehow.
But I have no idea where to begin with no service data available.
Also, is the 38v supply only for the doubler as well?
Thanks for any help.
