Date: Mon, 6 Oct 2025 17:24:29 +0000
Dear all,
To continue on with my previous post on this topic:
Here is the message I get when atma fails on carbon after a reboot. Interestingly
atma is not always trying to go to same position on the same match motor.
I tried the unplug/plug back PICS cable trick - did not work in my case.
The .bb file also always looks fine.
Previously I reported cycling through "wobb' and "atmm" to get atma to work.
Another method that works for me is to try atmm on another X nucleus, then
atmm (not atma) on carbon, then atma works on carbon, this seems to work
with only one iteration, not repeated cycles.
I might add for removing the probe cover, removing the probe cover is quite
easy, you just need to be very careful. First mark the base of the cover and
the base plate of the probe so that you can replace it back in the same position.
The screws (usually two) holding the cover to base plate can be removed from
the bottom of the base plate. Next is to tighten (turn clockwise) the two set
screws noting how many turns you use so that when you replace the cover you
use the same number of turns counterclockwise, usually 1.5-2 turns only is
required. These screws can be found in the holes along the side of the probe
about 60% and 80% of the way up the probe (top and bottom holes in the pic),
and good luck finding a suitable Allen key (I think they are metric). Then
gently slide off the cover with absolute minimal twisting and force.
Regards,
K. Klika
________________________________________
> From: main_at_ammrl.groups.io on behalf of Michael Groves via groups.io
> Sent: 04 October 2025 00:04:07
> To: main_at_ammrl.groups.io
> Subject: Re: [AMMRL] Tuning rods pinned?
I would strongly recommend against pulling the ATM unit off of the probe.
Unless you know how to do it, it's extremely likely you'll cause further
damage to the probe when you try to put it back on.
If you must disassemble something, I would recommend pulling the probe cover
off instead and trying to see which tuning rod might be jammed to the stop
and rotate the rod from there. Gently. If you want to pull the cover off,
there are a couple of screws that hold it on and a couple of teeny set-screws
behind holes in the probe body--they're like 1mm allen screws or something--
they're behind two little holes in the probe body (not the lock tuning hole(s)
and you have to screw them in or the probe cover will bind up on them and you
risk further damage if you yank on things. And be careful of the hardware at
the top of the probe--there are ceramic spacers and glassware up there and
you don't want to crunch stuff when you put it back together.
If you look at the rods you'll see the threaded bits and some little sliders
that go up and down between the stops. From that you should be able to tell
which rod it thinks is jammed to the stop. Don't go too nuts... If things
don't move fairly easily don't force them. If you do, I know some guys who
will happily repair your probe for a reasonable price. But we don't want
to give them extra work unnecessarily. Good luck.
Cheers,
Mike
On Friday, October 3, 2025 at 02:03:25 PM MDT, Baleja, James D via groups.io wrote:
Hi all, I reset the PICS line, and re-wrote the .bb file (changing the +244 to -99,
because that’s what I saw in the 90%/D2O line)
But alas get a similar error message "Can't move to position-99 (current 3)"
Maybe the next step is to remove the ATM unit so I can access the tuning rods
(I don’t think they are accessible without removing the ATM).
First I have to figure out how to remove the ATM unit!
Have a good weekend
Jim
--------------------------
Jim Baleja
Pronouns: he, him, his
Department of Medical Education (MV525S)
Department of Developmental, Molecular, and Chemical Biology (lab:Room MV614, rear)
Tufts University School of Medicine
136 Harrison Avenue
Boston, MA 02111
Tel: 617-636-6872
> From: main_at_ammrl.groups.io On Behalf Of PLscientific
> Sent: Thursday, October 2, 2025 6:51 PM
> To: main_at_ammrl.groups.io
> Subject: [External] Re: [AMMRL] Tuning rods pinned?
Hi Jim,
I would repeat the Ed suggestion. It is indeed a probe-dependent, but 244 looks
too high a number for 1H tuning, so the .bb file was likely overwritten with
the wrong number. In whichever case, after correction of .bb file (if it was
done correctly for the correct NMR probe), you should see a different number
in your ATMA error, like
"Can't move to position 21 , current -3" . If it continues to complain about
244, restart Topspin one more time. Indeed, it's good to swap PICs because the
ATMA probe reinitialization will be done again afterward.
Regarding the .bb file, other solvents may have a correct value, so you may
try to change a solvent simply by starting lock on another solvent.
If a similar problem occurs with the correct .bb file, the ATMA system will
have to be repaired. The simplest would be to check if the motor has not
got stuck in one of the limit positions (a rare reason, but you mentioned 19F).
Over the last three years, > 10 of our customers have asked us to fix that
error-related fault, so it is relatively common for the 2nd generation of
ATMA probes...
Regards,
Dr. Pavel Iouchmanov,
--
Repair/upgrade of NMR probes and NMR spectrometers
Electrophoretic NMR and custom NMR solution for electrochemistry
--
+46736220672
P&L Scientific AB
Applied Physical Chemistry, KTH
Teknikringen 36,
100 44 Stockholm
Sweden
pavel_at_plscientific.se<mailto:pavel_at_plscientific.se>
http://www.plscientific.se
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