On 10/16/2017 04:39 PM, ve3poa@... [hp_agilent_equipment] wrote:
So far I've removed all the boards I could that were relatively easy.? I
have not touched the ones that are under a metal panel identified as A
and then a number. A31 or A32 for example.
I'm no longer getting the several beeps sequence as before so something
has changed. Noticed after examining the power supple boards. However
the alphanumerics still do not display and the flashing dot on the
screen remains.
No burnt components were noticed when examining the boards or even a
hint that something was askew.
So, on to the next phase but that will be tomorrow.
Hey Peter, just a random data point here, from my own experience. I
picked up a 3585A awhile back that seemed to be a basket case. Display
problems, sweep control problems, pretty much everything seemed broken.
It was very cheap, and I had the service manual, so I was up for the
challenge.
I spent hours troubleshooting it, and eventually found that nearly all
of its problems were due to poorly-seated boards.
The only other issue was a blown fuse in the display section. Now,
conventional wisdom says "something caused that fuse to blow", but the
documentation simply states that if it's blown, just replace it. It
seems that fuse was just a bit under-specified, and they knew it.
Anyway, after some quality time with some DeOxit gold wipes on the
card-edge connectors, the analyzer is rock solid. There are a LOT of
card-edge connectors in that analyzer, and they're getting old by
now...you might want to take a look in that direction.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
Dave McGuire