[time-nuts] Advantest U3641 problem
magnus at rubidium.dyndns.org
Fri Jan 16 11:52:50 EST 2015
Well, there can be steerable "pots", DACs, DDSes and other similar
settings, but it may need the control which has not been left for either
users or service stations. This is sufficient to make enough boards go
through factor testing and out as sold products.
We didn't use to have requirements on this service degree on
instruments, since we used to have it anyway, but maybe there needs to
be such requirements about service-ability over time. If enough
govrement and industry adopt such rules, the market motivator may be
there. However, I see no such force today.
It's hard to show what the bottom line cost of different approaches is.
On 01/16/2015 04:48 PM, paul swed wrote:
> Chuck if its not a totally integrated PLL board then you might reverse
> engineer it and go from there.
> As Bob says thats harder and harder to do because adjustments are done in
> software and theres a big black chip with no clue these days. Technically
> speaking WAS (we are screwed). :-) Or in a sentence it WAS working.
> On Fri, Jan 16, 2015 at 7:05 AM, Bob Camp <kb8tq at n1k.org> wrote:
>> Usually (but not always) these are VCO drift issues. If you can spot a
>> tuning adjust on that board you are lucky. A lot of this stuff is now done
>> “no adjust” boards. They just swap out the board …
>>> On Jan 16, 2015, at 12:27 AM, Chuck Forsberg WA7KGX <caf at omen.com>
>>> My Advantest spectrum analyzer now comes up with an
>>> error 900 complaining about no PLL lock.
>>> This would appear to be a fault on the PLL board but the
>>> brain damaged Advantest service manual has no schematics
>>> for the boards.
>>> Any suggestions other than don't buy anything from Advantest?
>>> Chuck Forsberg WA7KGX caf at omen.com www.omen.com
>>> Developer of Industrial ZMODEM(Tm) for Embedded Applications
>>> Omen Technology Inc "The High Reliability Software"
>>> 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430
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