47
ZTKS0162 / Z31928 / 04
Troubleshooting
Continued from page before
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Indicator Possible reason Solution By
Shorting plug can
not be removed.
The connector is
covered with ice
(frozen moisture or
nitrogen ice).
Carefully remove the ice with
warm helium gas. Use the
dipstick or the precooling tube
as tubing for the warm helium
gas to remove small ice spots
from the connector.
Bruker Service
The magnet system
quenches.
Loss of
superconductivity.
See chapter ”After a
Quench” on page 53.
Bruker Service
The helium level was
too low for energiz-
ing, cycling,
shimming,
de-energizing or
sweeping.
See chapter ”After a
Quench” on page 53.
Bruker Service
The Power Supply is
defective. The main
current is oscillating.
Replace the Power Supply. Bruker Service
The main coil switch
can not be closed on
field.
The helium level is
too low for energiz-
ing. The main coil
switch is not covered
with liquid helium.
Never try to energize the
magnet with less than the
"minimum level during ener-
gizing" in the helium vessel.
Bruker Service
The Power Supply is
defective. The main
current is oscillating.
Replace the Power Supply. Bruker Service
Shim current can not
be set correctly.
The control cable is
not connected
correctly to the
current lead or to the
Power Supply.
Connect the control cable
correctly to current lead and
power supply.
Bruker Service
Switch „Main Coil/
OFF/Shim Coil“ in
wrong position.
Change the switch position. Bruker Service
Shims do not affect
the NMR signal.
Shim heater current
is not correct. The
shim switches are
not opened.
Set the shim heater current to
the specified value (see
Appendix Technical Data).
Bruker Service
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