Hi Tod,
I just pulled that board (i think) and found a burned 22uF tantalum.
Tantalum caps should have a very long life unless used on the wrong
place. I guess this is an example. I do not even stock them, the last
bad one I had to replace was in a G&M secutest 2 years ago. ( I repair
around 10-20 Secutests a year and that was the only bad tantalum)
With what type/value cap did you replace them ?
I found the 4708 manual at KO4BB but that is a user manual without
schematics.
The calibrator should be OK but before I try to start her I always like
check things like caps, connectors, solderjoints etc. It really looks
like new, not even a scratch or dust. It came with a new looking HP8640
and a new looking HP counter 5248. Both from the same cal lab (part of a
company that stayed there) that cal-lab closed about 30 years ago, but
all gear stayed where it was (I already had received most of their gear
a few years ago). This were the last things because my friend retires.
Fred
.
On 07/20/2017 04:51 PM, Todd Micallef wrote:
Fred,
Shorted tantalums most likely. I had several on mine that went bad as
quickly as I replaced them. I would start with the inguard supply board.
I think the 4708 manual is available for download at KO4BB or xDevs. If
not, I can dig up something. I have a set of the manuals.
Todd
On Thu, Jul 20, 2017 at 10:01 Fred <pa4...@gmail.com> wrote:
Today a friend gave me a Datron 4700. It looks like new. It is stored
(working) for many years in the cal lab he works. He was allowed to
take it home (for me, in return I will repair his SA), He plugged it in,
Fail 1 on the display followed by a sound and a smell.
I opened it but nothing looks burned.
I can not find a service manual, does someone has one ?
On the back the label shows no options but if he remembers it well it
should have all or at least most options. All slots are filled with
pcb's. The "box" in the left upper corner is full and there is a very
small pcb next to it. There is not much room left. Just enough to store
a small multimeter between the huge transformer and that box.
Fred
www.pa4tim.nl
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