74 (107) BRUKER CryoProbe User Manual
Troubleshooting
General failure 7.4
0
If the displays are erratic, blank, or unresponsive, this suggests a general failure
of the CryoController, probably resulting from a problem in the power supply or in
the CPU circuit.
1. Check the connections and cables between the units.
2. Reboot the CryoController with the rotary main switch on the Cryo-
Cooling Unit front (this is the same as an "Emergency Off" on page
71).
3. Check the fuses.
No mains 7.4.1
Is there a plug in the R
EMOTE SWITCH socket at the CryoCooling Unit rear panel?
The plug short-circuits the two pins of the socket. If the plug is missing or if the
short inside is broken, the mains power of the whole CryoCooling Unit is inhibited.
Check "Fuses and reset buttons" on page 73
.
Spinning problems 7.4.2
The circumstances of a sample spinning problem restrict the choice of possible
causes. Go sequentially through the following list, it is organized by increasing
complexity and decreasing likelihood of the fault.
During operation
Is the pneumatic gas supply for sample spinning still ok? Check its input pressure
at the rear of the spectrometer cabinet.
Is the VT gas flow rate too high such that it lifts the sample?
Eject the sample and check if it is ok.
Has the vertical alignment of the magnet changed? Check with a water-level.
After insertion of a new sample
Try another sample or another spinner. Check if a high quality sample tube (e.g. a
B
RUKER standard sample) in a high quality spinner can be spun.
Check the CryoProbe cavity for dirt and clean it if necessary (see "Cleaning" on
page 67).
When the CryoProbe had been removed and was mounted again
Is the CryoProbe at the correct position inside the shim system, i.e. is there a gap
of ~0.5 mm between the CryoProbe body and the shim system bottom plate? Is
the shim system bottom plate fixed firmly? Try another probe: Is the same unusual
gap present? Had the shim system been removed some time ago?
If the gap is larger, do the five screws in the Mounting Hardware fail to support
the CryoProbe? If they are ok, lower the CryoProbe by a few mm and re-insert it
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