[volt-nuts] Datron 4700 manual and options

[Fred]

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 <pa4tim at 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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