Bruker BioSpin NMR CASE User manual

Version
think forward
Bruker BioSpin
NMR CASE
021
NMR Spectroscopy
Troubleshooting Guide

This manual was written by
Martin Rindlisbacher
© January 29, 2004: Bruker Biospin Corporation
Billerica, MA, USA
This manual was desktop published by
Stanely J. Nles
© January 12, 2009: Bruker Biospin GmbH
Rheinstetten, Germany
P/N: B2927
DWG-Nr.: 0000021
For further technical assistance on the NMR CASE unit, please
do not hesitate to contact your nearest BRUKER dealer or
contact us directly at:
BRUKER BioSpin GMBH
am Silberstreifen
D-76287 Rheinstetten
Germany
Phone: + 49 721 5161 0
FAX: + 49 721 5171 01
Email: [e-mail]
Internet: www.bruker.com
Copyright © by Bruker BioSpin NMR GmbH
All rights reserved. No part of this publication
may be reproduced, stored in a retrieval
system, or transmitted, in any form, or by any
means without the prior consent of the
publisher. Product names used are
trademarks or registered trademarks of their
respective holders.

Troubleshooting Guide Version 021 BRUKER BIOSPIN 3
Contents
Contents ............................................................................ 3
1 Installation Problems ......................................................... 5
1.1 Sample Eject (Lift) Problems .............................................................. 5
Sample lift air flow ..........................................................................5
Sample holder tray slamming ..........................................................5
Light barrier ....................................................................................5
Seals ..............................................................................................6
Seating of the adapter collar ...........................................................6
Alignment of the adapter collar, seal ring and brown interface tube ..6
Sample lift air bypass ......................................................................6
Interface tube inside the adapter collar ............................................6
1.2 Sample Insert (Down) Problems ......................................................... 7
NMR CASE or magnet not level ......................................................7
BST shim stack with sharp edges ....................................................7
Sample lift air bypass ......................................................................7
Too much sample lift air flow ...........................................................8
Sample holder tray does not advances firmly ..................................8
Alignment of the adapter collar, seal ring and brown interface tube ..8
Interface tube inside the adapter collar ............................................8
1.3 Sample holder tray does not advance at all ......................................... 9
1.4 The sample holder tray advances when the eject air is turned OFF ..... 9
1.5 The motion controller does not work ................................................. 10
1.6 The sample holder tray slams samples when advancing ................... 12
1.7 The adapter collar does not fit to the shim stack ............................... 12
1.8 The NMR CASE does not fit ............................................................. 12
1.9 The sample spin rate goes up to 150 Hz ........................................... 13
1.10 Intermittent problems ........................................................................ 13
1.11 Sample lift (eject) sometimes hangs on top of the BST and does NOT go
up into the NMR Case ......................................................................13
1.12 Sample lift (eject) always hangs on top of the BST and does NOT go up
into the NMR Case ...........................................................................14
1.13 Sample lift (eject) hangs just below the top of the sample holder tray 14
1.14 Sample insert (down) sometimes hangs on top of the sample holder tray
..........................................................................................................14
1.15 Sample insert (down) sometimes hangs at the white ring on top of the
adapter collar ................................................................................... 14
1.16 The sample holder tray does not advance away from position 0 ........ 15
1.17 Sometimes the tray rotates in the wrong direction ............................. 15
1.18 Sometimes the tray does not rotate ................................................... 15
1.19 Sometimes samples stuck in brown interface tube (inside the adapter col-
lar) ................................................................................................... 16

4 BRUKER BIOSPIN Troubleshooting Guide Version 021
Contents
2 Problems During Operation ..............................................17
2.1 The air cylinder is too weak and does not rotate the sample tray complete-
ly ..................................................................................................... 17
2.2 The air cylinder leaks oil ................................................................... 18
2.3 The NMR Case shares off sample tubes ........................................... 18
2.4 The air cylinders do not work ............................................................ 19
2.5 The adapter collar cannot be removed from the BST upper stack. .... 19
2.6 The black push lever on the side of the NMR Case feels loose and does
not move at all. ................................................................................ 20
A Illustrations ...................................................................... 21
Figures ............................................................................. 25

Troubleshooting Guide Version 021 BRUKER BIOSPIN 5 (27)
1
Installation
Problems 1
Sample Eject (Lift) Problems 1.1
Sample lift air flow 1.1.1
When ejecting the sample, it must come up with speed (within 10 seconds) and
climb all the way to the top of the NMR Case. There must be enough airflow so
that the top of the spinner is pressed against the sample stop head on top of the
sample tray. A setting of 850 for the sample lift air flow is the normal value for the
operation with a NMR Case.
If the sample creeps up very slowly and barely reaches the sample stop, then the
sample lift airflow must be increased. There is a dedicated method on how to ad-
just the sample lift airflow within the NMR console. It is done either by software or
with the BSMS. Do not increase the console main air pressure. Read the corre-
sponding manual on how to adjust the sample lift airflow (or ask Bruker for assis-
tance).
In case the sample lift airflow needs to be increased fully to its maximum, then
there is possible an air leak. Read and follow sections 1.1.3 to 1.1.8 to find the
fault.
Note that the factory sample lift air flow setting is 750 and that the console will re-
vert back to this factory setting after a power loss, unless the larger value of 850 is
stored in memory.
Sample holder tray slamming 1.1.2
If the sample holder tray slams when advancing, it may need more sample lift air
than necessary. See section 6 for adjustments.
Light barrier 1.1.3
There is a light barrier built into the top part of the BST shim stack, it slows down
the sample lift. Use the sample control modifier cable P/N B1428 to disengage the
light barrier. Read the instruction sheet P/N B2300.

6 (27) BRUKER BIOSPIN Troubleshooting Guide Version 021
Installation Problems
Seals 1.1.4
To avoid sample lift air leaks, the following four seals must be properly installed
(see Installation manual Figure 1, page 19):
1. Inside the adapter collar: one O-Ring.
2. On top of the adapter collar: one flat rubber seal.
3. Inside the large white round ring plate: one flat rubber seal.
4. One white or brown seal ring on top of the large white round ring plate.
Seating of the adapter collar 1.1.5
Check that the adapter collar is seated correctly on top of the BST shim stack.
The lower end of the collar must be flush with the lower end of the top large por-
tion of the BST.
Alignment of the adapter collar, seal ring and brown interface tube 1.1.6
The adapter collar, seal ring and brown interface tube inside the collar must be
aligned. Loosen the three screws of the collar and insert the gray safety ring
through the seal ring into the brown interface tube. The safety ring serves as
alignment tool. Tighten the three screws again and remove the safety ring.
Sample lift air bypass 1.1.7
There is a small pneumatic cylinder located inside aluminum housing underneath
the NMR Case base plate (see Figure A.2. and Figure A.3.). This cylinder opens
and closes a sample lift air bypass exit hole, located in the adapter collar. If the by-
pass exit hole is not closed completely, the sample will not eject to the top of the
sample tray, but will sit on top of the BST instead.
Read section 1.1.8 on how to check for correct operation.
Interface tube inside the adapter collar 1.1.8
Inside the adapter collar is a tube, which interfaces the adapter collar with the
BST shim upper stack (see Figure A.2. and Figure A.3. at the end of this manual
and Figure 3 at the end of the installation manual). The correct seating of the
adapter collar and the interface tube is critical for the reliability of the sample
changer.
To check the seating, first remove the 3 screws and then remove the NMR Case
base plate, leaving only the collar in place.
Check that the bottom of the collar is flush with the BST. Check that the interface
tube is flush with the top of the collar.
Check that the five fingers of the interface tube are not bent inwards and block the
inside diameter of the BST.

Sample Insert (Down) Problems
Troubleshooting Guide Version 021 BRUKER BIOSPIN 7 (27)
See Figure 4 at the end of the installation manual for the correct seating. See Fig-
ure 5 at the end of the installation manual for the incorrect seating.
If the collar cannot be seated correctly, then check the BST top head for parts
sticking out (labels or covers).
If the O-ring does not engage onto the BST (it feels too tight), then apply some sil-
icone grease onto the O-ring inside the collar.
If the interface tube is not flush with the top of the collar, then it may be an old ver-
sion (made from brown plastic). Replace it with a new version made from black
metal (P/N B3695).
If the inner diameter of the interface tube seems to be too small, then it may be an
old version, made from brown plastic. Replace it with a new version made from
black metal (P/N B3695).
Sample Insert (Down) Problems 1.2
NMR CASE or magnet not level 1.2.1
The shim stack must be vertical and the NMR Case horizontal aligned. Check it
with the circular level (supplied with the tool kit). The bubble must be inside the in-
nermost ring. Adjust the magnet stand and the telescopic front feet as necessary.
BST shim stack with sharp edges 1.2.2
On top of the BST, where the samples are inserted, there are some cutouts locat-
ed on the inside diameter. Some cutouts have sharp edges. If this is the case
(check it with a finger), either replace the BST or remove the sharp edges with a
file.
Sample lift air bypass 1.2.3
After changing a sample, the new sample should stay on top of the sample holder
tray for a short moment, before it is rapidly inserted into the BST (within 2 sec-
onds).
There is a small pneumatic cylinder located inside aluminum housing underneath
the NMR Case base plate (see Figure A.2. and Figure A.3.). This cylinder opens
and closes a sample lift air bypass exit hole, located in the adapter collar. Check
for the correct opening and closing of this bypass exit hole.
If the bypass exit hole is not open completely, the sample does not get inserted
fast enough into the BST and may get stuck on top of the BST.
If the bypass exit hole is not closed completely, the sample will not eject to the top
of the sample tray, but will sit on top of the BST instead.
If the bypass does not open or close, adjust the air flow valves. Refer to Figure
A.3. at the end of this manual and locate the air flow adjustment screws number 1
and 2. Using a small screwdriver, rotate both screws out (counterclockwise) by
one turn each. Then do the same with airflow valves number 5 and 6.

8 (27) BRUKER BIOSPIN Troubleshooting Guide Version 021
Installation Problems
Too much sample lift air flow 1.2.4
If the sample lift airflow is excessive large, then the sample is not inserted rapidly
into the BST as described in section 1.1.1 above, despite the open bypass exit
hole. The samples may get stuck on top of the BST.
Reduce the sample lift airflow.
See section 1.1.1 of this manual on how to adjust the sample lift airflow for a good
sample lift within 10 seconds.
If the sample lift airflow needs to be excessive large, then check section 1.1.2 and
section 1.1.4 for possible faults.
Sample holder tray does not advances firmly 1.2.5
The sample holder tray must advance with some speed and should be stopped
firmly in the next position. If the sample holder tray just creeps forward slowly and
hesitantly, then the next openings for the sample may not be aligned properly and
the sample may get stuck. Although the NMR Case is factory adjusted, this specif-
ic adjustment is air pressure dependent and therefore may need some tweaking
at the installation site.
Check that the bottom of the sample holder tray is clean and free of foreign debris
like sticky tape, glue from tape or staplers.
Check that the 3 white round plates located on the NMR Case base plate are
clean and free of foreign debris like sticky tape, glue from tape or staplers parts.
Switch off the motion controller and push the black pin on the side to the inside
out of the way. Mount the sample holder tray and check for smooth rotation by
hand. It should not go easy, but with a constant force and without steps.
If the sample holder tray rotates smooth, then increase the airflow for the pneu-
matic piston by adjusting flow reducers # 4. It is located underneath the NMR
Case base plate, on a manifold (see Figure A.3.). Use a small screwdriver and
turn the adjustment screws counter clockwise (CCW) out by quarter turn incre-
ments. Check for the firm advancement and turn further out if necessary. If there
is no change in the sample holder tray advancement, then turn flow reducer # 3
out counter clockwise (CCW) by quarter turn increments as well.
However the airflow should not be increased too much or the sample holder tray
will slam the sample tubes. See section 6 of this manual.
Alignment of the adapter collar, seal ring and brown interface tube 1.2.6
Check the alignment according section 1.1.6 of this manual.
Interface tube inside the adapter collar 1.2.7
Check it according section 1.1.8 of this manual.

Sample holder tray does not advance at all
Troubleshooting Guide Version 021 BRUKER BIOSPIN 9 (27)
Sample holder tray does not advance at all 1.3
A sample has been removed manually or the NMR Case has been used in manu-
al mode. Make sure there is no sample inside the magnet. Press the RESET but-
ton while the sample lift is OFF to clear the sample tracking memory.
Increase the airflow for the pneumatic pistons by adjusting the flow reducers #
1,2,3,4. They are located underneath the NMR Case base plate, on a manifold
(see Figure A.3.). Use a small screwdriver and turn the adjustment screws coun-
ter clockwise out by one turn each.
Open the motion controller (see section 1.5). Observe the turn ON/OFF sequence
of the green LED lights. The upper row of lights is marked IN, the lower row of
lights is marked OUT.
Check that IN - 0 is turned ON when the sample is on top of the sample holder
tray. The sample holder (spinner) must be pressed up firmly against the sample
stop head of the tray by the sample lift air. This turns on IN –0. If there is a gap be-
tween the spinner and the stop head, then IN – 0 is not turned ON and the motion
controller does not rotate the sample holder tray. Increase the sample lift airflow
according section 1.1.1.
Check that IN-3 is ON before IN-0 is ON when ejecting the sample. If IN-3 is ON
after IN-0, then the controller unit should be exchanged with a new version (ECL
30).
If the room temperature is above 24 degrees C and the supply main air pressure
above 70 psi (5 bar), then it can happen that the green lights ON –1 and ON – 0
do come on, but the sample holder tray does not rotate. If this is the case, then the
motion controller should be exchanged with a new version (ECL 30).
The sample holder tray advances when the eject air is turned OFF 1.4
The hoses for sample lift air and spinning rate air are switched around. The spin-
ning air activates the NMR Case.
Events LED sequence
Sample goes up (eject) ON IN - 1, 3, 2, 0
Sample holder tray rotates ON OUT - 1, 0
Sample goes down (insert) OFF IN - 0, 2, 3, 1
Rotating mechanism resets OFF OUT - 1, 0
Air ON (always ON) ON OUT - 2
Next sample is inserted ON OUT - 3
No sample is inserted OFF OUT - 3
Reset button depressed ON
OFF IN – 4 OUT - 3

10 (27) BRUKER BIOSPIN Troubleshooting Guide Version 021
Installation Problems
Check that the sample lift air comes out of the white hose.
The motion controller does not work 1.5
Make sure there is no sample in the magnet and press the RESET button.
This clears the sample position memory. The controller will not change samples if
he thinks that a sample is already down in the shim coil.
If it still does not work after pressing the RESET button, then follow the next steps.
1. The controller contains electrical valves, which do not work in a magnetic field.
Make sure that the controller is at least 2 meters (6 feet) away from the magnet
dewar cryostat.
2. Open the motion controller. First loosen the four screws of the cover by two
turns counter clockwise each. Now lift up the cover up as far it goes (the cover
may stick to the case, just pull on it). Finally loosen the screws all the way and
pull the cover off.
3. Switch the motion controller off and on. Observe all LED lights and check on
which outputs the air comes out.
For the first two seconds the following LED’s should blink and no air should
come out:
Two seconds after switching on, air should come out of L-IN and RET, the
LED’s should be on (* Out 3 may be green or not):
012345IN
Green Green Red Green
PWR RUN ERR STAT 012 3OUT
012345IN
Green Green Green Green (Green*)
PWR RUN ERR STAT 0 1 2 3OUT

The motion controller does not work
Troubleshooting Guide Version 021 BRUKER BIOSPIN 11 (27)
Three seconds after switching on, the air should come out of L-OUT and
RET, the LED’s should stay on (* Out 3 may be green or not):
4. If there are no LED lights, check the power cord and the fuse. There is a spare
fuse inside the unit, 250V-3A slow-blow.
5. If the red LED stays on longer than two seconds, then the motion controller
unit needs to be replaced.
6. To check the IN-LED’s individually, use a short piece of Ø 4 mm hose (sup-
plied) to blow into the corresponding sensor inputs.
7. To check IN-4, press the RESET button, it activates IN-4 (and switches OUT -3
off if it was on).
8. Connect SENSOR 1, SENSOR 2 and SL-SENSE of the black pneumatic hose
assembly to the motion controller and, at the other end, blow simultaneously
into the three hoses no. 5, 6 and 7.
9. While slowly increasing the blowing pressure, observe the sequence of the IN-
LED’s turning green:
IN-2, IN-0, IN-1, IN-3.
10. As soon all four IN-LED’s turned green, the OUT-LED’s should turn on/off in
the following sequence:
OUT-3 on, OUT-3 off, OUT-1 on, OUT-0 on, OUT-3 on.
11. At the same time, air should come out of the pneumatic outputs in the following
sequence: RET air off, EXT air on, L-OUT air off, L-IN air on.
After releasing the blow pressure, the controller goes back to the status in sec-
tion 1.5
012345IN
Green Green Green (Green*)
PWR RUN ERR STAT 012 3OUT
LED Input Event status Hardware
IN-0 SENSOR 1 Sample up, on top Pressure sensor 1.5 “ H2O PSF 100 A – 1.5
IN-1 SL-SENSE Sample lift air on ,low pressure Pressure sensor 4” H2O PSF 200A dual 4/15
IN-2 SENSOR 2 Adapter collar pressure on Pressure sensor 0.5 “ H2O PSF 100 A – 0.5
IN-3 SL-SENSE Sample lift air on, high pressure Pressure sensor 15” H2O PSF 200A dual 4/15
IN-4 RESET Reset sample insertion memory RESET switch at the side of motion controller

12 (27) BRUKER BIOSPIN Troubleshooting Guide Version 021
Installation Problems
The sample holder tray slams samples when advancing 1.6
If the sample holder tray is slamming into the next position so hard that the sam-
ple tubes are shaking dangerously, then the airflow for the pneumatic piston
needs to be decreased. This is done by adjusting the air flow reducer # 4, located
underneath the NMR Case base plate on a manifold (see Installation manual Fig-
ure A.3.). Use a small screwdriver and turn the adjustment screw clockwise (CW)
in by quarter turn increments. Check for slamming and turn further in if necessary.
However the airflow should not be decreased too much, else the sample holder
tray will no longer advancing firmly. See section 1.3 of this manual.
The adapter collar does not fit to the shim stack 1.7
One adapter collar for a shim upper stack type BST is included with every NMR
Case.
For shim stacks other than of type BST, different adapter collars can be ordered
and mounted to the NMR Case base.
Read and follow the NMR Case system requirement manual P/N B2928, section
1.6.
The NMR CASE does not fit 1.8
Read and follow the NMR Case system requirement manual P/N B2928, section
1.11.
LED Output Action Hardware
OUT-0 On CYL A L-IN (Latch in) MAC valve for CYL A (located in middle)
Connector Indicates tray advanced Test connector pin 7 = + 5 V / Ground =
pin 5
Off CYL A L-OUT (Latch out)
OUT-1 On CYL B EXT (Latch extend, rotate tray) MAC valve for CYL B (located at left)
Off RET (Latch retract)
OUT-2 On MAIN AIR Main air on MAC main air valve (small, located at
right)
Off Main air off
OUT-3 On Connector Indicates sample changed.
Can be switched off with
RESET button.
Test connector pin 3 = + 5 V / Ground =
pin 5
Off

The sample spin rate goes up to 150 Hz
Troubleshooting Guide Version 021 BRUKER BIOSPIN 13 (27)
The sample spin rate goes up to 150 Hz 1.9
Check the following to see if the problem goes away:
Unplug the spin rate cable connector at the BST shim stack. Check it and plug it
back in.
Remove the BSMS sample control modifier cable B1428 (see instruction sheet
B2300).
Check the spin rate settings.
Intermittent problems 1.10
The following 4 items need to be properly adjusted for a reliable long-term opera-
tion of the NMR Case.
Sample lift (eject) sometimes hangs on top of the BST and does NOT go up into
the NMR Case 1.11
Item Necessary Adjustments Troubleshooting Guide
1NMR Case or magnet not leveled Section 1.2.1
2Sample lift air flow Section 1.1.1 and 1.1.7
3Sample holder tray movement Section 1.2.5 or 1.2.6
4Seating of collar and adapter tube Section 1.2.7
Item Check out Troubleshooting Guide
1Correct closing of the sample lift air bypass Section 1.2.3
2Seating of collar and adapter tube Section 1.2.7
3Sample lift airflow Section 1.1.1
4Alignment of collar, ring, brown tube Section 1.2.6
5Sample holder tray advances firmly Section 1.2.5
6Sample lift airflow Section 1.1.1

14 (27) BRUKER BIOSPIN Troubleshooting Guide Version 021
Installation Problems
Sample lift (eject) always hangs on top of the BST and does NOT go up into the
NMR Case 1.12
Sample lift (eject) hangs just below the top of the sample holder tray 1.13
Sample insert (down) sometimes hangs on top of the sample holder tray 1.14
Sample insert (down) sometimes hangs at the white ring on top of the adapter
collar 1.15
Item Check out Troubleshooting Guide
1Sample lift airflow Section 1.1.1
2Correct closing of the sample lift air bypass Section 1.2.3
3Sample holder tray advances firmly Section 1.2.5
4Motion controller has no power Section 1.5
5Motion controller has no air pressure Section 1.5
Item Check out Troubleshooting Guide
1Sample lift airflow Section 1.1.1
2Sample holder tray advances firmly Section 1.2.5
Item Check out Troubleshooting Guide
1Sample holder tray advances firmly Section 1.2.5
2Correct opening of the sample lift air bypass Section 1.2.3
3Too much sample lift air flow Section 1.2.4
Item Check out Trouble Shooting Guide
1Sample holder tray advances firmly Section 1.2.5

The sample holder tray does not advance away from position 0
Troubleshooting Guide Version 021 BRUKER BIOSPIN 15 (27)
The sample holder tray does not advance away from position 0 1.16
1. A sample has been removed manually or the NMR Case has been used in
manual mode. Make sure that there is no sample inside the magnet. Press the
RESET button (on the side of the controller) while the sample lift is OFF to clear
the sample tracking memory. Note: pressing the RESET button while the sample
lift is ON does not work.
There was a mains power outage. See section 2.6.
Sometimes the tray rotates in the wrong direction 1.17
Refer to Figure A.3. at the end of this manual and locate the air flow adjustment
screws number 1 and 2. Using a small screwdriver, rotate both screws out (coun-
terclockwise) by two turns each.
Make sure that the sample holder tray rotates fast enough. Refer to section 1.2.5
of this manual and, if necessary, adjust the air flow adjustment screw number 4
out (counterclockwise) in half turn steps until the tray advances fast and comes to
a firm stop (but does not slam the samples).
Check that the motion controller is not too close to the magnet, see section 1.5
If this does not solve the problem, then the motion controller should be exchanged
with a new version EC 30.
Sometimes the tray does not rotate 1.18
2Alignment of collar and white ring Section 1.2.6
3Seating of collar and adapter tube Section 1.1.8
4BST shim with sharp edges Section 1.2.2
5NMR Case or magnet not leveled Section 1.1.8
Item Check out Troubleshooting Guide
1I – 0 turn ON Section 1.3
2I – 3 ON before I – 0 Section 1.3
3O – 1 and O – 0 ON, but no tray rotation Section 1.3
4Controller too close to the magnet Section 1.5
5Oil or dust in the cylinders Section 2.1, 2.2, 2.4

16 (27) BRUKER BIOSPIN Troubleshooting Guide Version 021
Installation Problems
Sometimes samples stuck in brown interface tube (inside the adapter
collar) 1.19
Exchange the brown (plastic) interface tube with a new black (metal) one. The
part number for the new black interface tube is B3695.
See Figure A.1. and Figure A.2. for location of the adapter tube.
See figure 3 of the installation manual on how to exchange it.

Troubleshooting Guide Version 021 BRUKER BIOSPIN 17 (27)
2
Problems During
Operation 2
This chapter covers problems that occur after the unit has been operating routine-
ly for a longer time.
The air cylinder is too weak and does not rotate the sample tray completely 2.1
Actually the air cylinders are so strong that they can slam the sample tray with a
large force, causing damage to the push lever, extend stop post and finally the
base plate.
Therefore the air cylinders have to be restrained. This is done with airflow control
valves. Each cylinder has two airflow control vales. The airflow passing through
the valve can be adjusted with a screwdriver and thus the power of the cylinders
can be set precisely.
So if there is not enough sample tray rotation, a quarter turn counter-clockwise
(out) on the adjustment screw of the # 4 flow control valve usually solves this
problem.
See Figure A.3.: NMR Case bottom view for the location of the airflow adjustment
screws.
See installation manual B926, Figure 6, page 24 for another view of the air flow
adjustment screws.
See the manual “NMR Case System Requirements, section 1.10” for the specifi-
cations of the compressed air.
Dust in the compressed air or gas line can block the small opening inside the air-
flow control valves. To unblock the valves, do the following:
1. Switch off the motion controller.
2. Pull off all air hoses at the cylinder ports.
3. Switch on the motion controller.
WARNING!
Oil and dust from the compressed air source will weaken and dam-
age the air cylinders after a while.

18 (27) BRUKER BIOSPIN Troubleshooting Guide Version 021
Problems During Operation
4. While the air is coming out of the open hoses, turn the screw of the airflow con-
trol valves all the way out and then back in. This clears out the small particles.
5. Switch off the motion controller and plug the hoses back into the ports of the
cylinder.
6. Switch the motion controller back on and adjust the airflow control valves ex-
actly.
See section 2.5 for other possible causes of incomplete sample tray rotation.
See section 2.4 on how to check out the air cylinders.
The air cylinder leaks oil 2.2
There should be no oil inside the cylinders. The whole NMR Case is based on oil-
free air cylinders and air valves.
The oil is coming from the compressed air source. It will damage the air cylinders
after a while.
All oil filters need to be flushed out and cleaned on a regular basis, otherwise they
stop the filtering operation.
See the manual “NMR Case System Requirements, section 1.10” for the specifi-
cations of the compressed air.
To remove the oil, clean air must be blown through all hoses and valves of the
NMR Case and the Motion controller. The air cylinders may need replacement.
The Bruker part number for the large Bimba cylinder A and B is 92551
The Bruker part number for the small Bimba cylinder is 92552
The NMR Case shares off sample tubes 2.3
After a mains power loss the console will set the sample lift air flow back to the
stored value. If the stored value is the factory default of 750 (instead of the neces-
sary 850), the sample will not eject all the way up to the top of the sample tray
anymore, but rather stay somewhere inside the sample tray.
If this is the case, the built in safety features of the NMR Case controller prevents
the advance and rotation of the sample tray and the sample is protected.
If the operator now decides (wrongly) to press the RESET button before ejecting
the sample, then the safety feature of the NMR Case is overridden, the sample
tray will advance and share off the sample tube.
The better way:
•Read "Sample lift air flow" on page 5 for adjusting sample lift air flow.
•Make sure to store the larger air flow value in memory.
•The RESET button should be pressed only if a sample has to be removed
manually without going into the sample holder tray.
•Only press the RESET button if there is no sample inside the magnet.

Problems During Operation
Troubleshooting Guide Version 021 BRUKER BIOSPIN 19 (27)
The air cylinders do not work 2.4
To check the air cylinders:
1. Make sure the motion controller is switched on. Remove the sample holder
tray. Refer to Figure A.2.. Try to move manually the black push lever at the
side of the base cover to the left (to position Cyl B Extend) and also try to push
it in. It should require a great force to move the push lever.
2. Switch off the motion controller and move the push lever the same way as
above. Now it should be easy to move and it should not stick at any point.
The Bruker part number for the large Bimba cylinder A and B is 92551
The Bruker part number for the small Bimba cylinder is 92552
The adapter collar cannot be removed from the BST upper stack. 2.5
The adapter collar should sit tight on the top of the BST shim stack. There is an O-
ring inside the collar, which causes the tight fit. There are no screws that attach
the collar to the BST shim stack. Normally the collar can be pulled off by hand, us-
ing a little force.
The BST shim stack has a serial number label glued to the outside of the cylindri-
cal top part. The glue of this label can be the reason for a very tight fit of the collar.
In this case, use a piece of wood to lever off the collar from the shim stack.
To avoid this problem in the future, remove the label carefully from the shim stack
and reattach it again to the lower, narrower part of the shim stack, and apply some
silicon grease to the O-ring.
WARNING!
Oil and dust from the compressed air source will weaken and dam-
age the air cylinders after a while. See section 2.1.
WARNING!
Do not use metallic tools (screwdriver). Beware of the very strong
magnetic field.

20 (27) BRUKER BIOSPIN Troubleshooting Guide Version 021
Problems During Operation
The black push lever on the side of the NMR Case feels loose and does not
move at all. 2.6
Item Check out Troubleshooting Guide
1Motion controller has no power Section 1.5
2Fuse is blown Section 1.5
3Motion controller has no air pressure Section 1.5