I fixed the one I purchased from eBay with the help from goys here! I'm
sure you can fix it!
Now, I'm not an expert, but in my case it was -after many days and emails
and searches on the web....- easy fix (if you can call it that).
If I can help with something specific I'll help.
My problem was - see my youtube here:
Gooood luck!
Tony
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On Wed, Aug 14, 2019 at 4:51 PM Paul Gallimore <paulmk22@...> wrote:
Hi,
I acquired a 2445A a few years back and never switched it on until now. I
am now starting to look at it for the first time and there are a couple of
issues, but I have no scope fixing experience. Plus it's been a while since
I did any fault finding on anything truly electronic.
So, I am trying to assess whether I should sell this on Ebay (UK) as a
broken item, or whether I should take a shot at fixing it up.
I have powered it up and there are no reported faults, plus the scope
traces appear as they should, as well as on screen characters. However,
after a warm-up period (5-10 mins) the sweep stops and I am left with just
a vertical trace. Using the J119 test points I can see that the supplies
all look good with a DVM, but using Pico scope (laptop based scope) I can
see some ripple on the supplies. I have yet to determine whether the ripple
is in spec. (Though, I know where the info for that is in the manual)
Where do you think I should start with this? Should I just do a bulk
capacitor swap out an ask questions later, or are there a few particular
ones I should go for?
I should also say that some of the on-screen characters seem to get
corrupted after a while as well.
Any opinions on where I should go with this would be appreciated.
Thanks
Paul
