The sample holder tray slams samples when advancing.
NMR Case
Trouble Shooting Guide BRUKER Page 9 of 15
4.1.10 switching the controller on and off. During the first 2 seconds, no air comes out. After two seconds, air comes out at
CYL A L-IN and CYL B RET. After four seconds, air comes out at CYL A L-OUT and CYL B RET.
Row LED Output Action Hardware
CYL A Latch in MAC valve for CYL A L – IN / L – OUTOO-0
Connector Indicates tray advanced Test connector pin 7 = + 24 V / Ground = pin 5
O O-1 CYL B Latch extend ( rotate tray) MAC valve for CYL B EXT / RET
O O-2 MAIN AIR Main air on MAC main air valve
O O-3 Connector Indicates sample changed Test connector pin 3 = + 24 V / Ground = pin 5
5. The sample holder tray slams samples when
advancing.
If the sample holder tray is slamming into the next position so hard that the sample 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 Figure 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, or the sample holder tray will no longer advancing firmly. See
section 2.5 of this manual.
6. The adapter collar cannot be removed from the
BST upper stack.
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,
using a little force.
The BST shim stack has a serial number label glued to the outside of the cylindrical 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.
Warning: Do not use metallic tools (screwdriver). Beware of the very strong magnetic field.
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.
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