Date: Thu, 23 Oct 2025 15:37:18 +0000
Hi NMRers,
Showing my lack of knowledge here, but I'm trying to remove our Bruker TXI
probe and I have 4 questions.
1. How do I remove the gradient connection (the cable to the left of the
fuzzy photo)?
2. How do I remove the flush gas tube (the white tube to the back right)?
3. How do I replace the flush gas tube (it's fragile and I partially snapped
it - although I can probably fix well enough with parafilm)?
4. How is the probe held in place? In the past it was brass rods with knurls,
but I think it's a clip now?)
Next job is to see if I can find a manual somewhere!
I'm trying to see if I can get our ATM unit to respond while the probe is
outside the magnetic field. If not responding, I'll send the probe back
for repairs
Thanks
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 Michael Groves via groups.io
> Sent: Friday, October 3, 2025 5:04 PM
> To: main_at_ammrl.groups.io
> Subject: [External] 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 +24=
4 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 A
TMA 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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