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 <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 complan
about 244, restart Topspin one more time. Indeed, it's good to swap PI
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
http://www.plscientific.se
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Received on Mon Oct 06 2025 - 05:05:19 MST