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?
--
Hi
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 …
Bob
On Jan 16, 2015, at 12:27 AM, Chuck Forsberg WA7KGX c...@omen.com wrote:
My
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
Hi,
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
