Hi Beth,
Can you measure a 2H 90 deg pulse or measure the output from the 2H Tx board
with an oscilloscope? Does the lock signal still scale with the lock power
setting?
Glenn
> On May 22, 2025, at 12:52 PM, Beth Moscato via groups.io wrote:
>
>
> Hi
>
> I’ve got an 400MHz AVANCE I console that is suddenly giving little /
> no lock signal. I had very similar symptoms in April which I tracked down
> to a loose 2H_TR_J4 cable (jostled during other troubleshooting), but I
> am seeing identical issues now which developed suddenly overnight (presumably
> without students jostling the console).
>
> Basically, when looking at the lock display, I see very little signal –
> when I am unlocked and sweeping with my doped D2O sample, I am see maybe 4x S/N
> for the sine waves even using the lock power settings for 90% H2O. Locking is
> of course difficult or impossible under these circumstances.
>
> The channel wobbs fine, and a pw90 on 2H yields 400us – slightly
> higher than the desired 350, but not so high to explain the problem. Zg2h
> yields decent signal.
>
> I went and tightened all the cables on the LCB, R-TX, and L-TX boards. Several
> are older and may be a bit frayed – I noticed that this was a o
> problem earlier this year.
>
> All the lights on the LCB board are green, but the red “error”
> message is also on. I can’t find the original AVANCE I LCB manual –
> I don’t know what it means specifically.
>
> Is there any chance there’s a repository of technical manuals for
the AVANCE series online somewhere, by the way? I’ve got a scope,
but I don’t know what power levels I should be expecting to detect.
>
> Thanks for any advice,
> Beth
>
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Received on Thu May 22 2025 - 10:14:31 MST