[time-nuts] Advantest U3641 problem
paulswedb at gmail.com
Fri Jan 16 10:48:24 EST 2015
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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