AMMRL group,
I have a problem with a Bruker Advance 500 that has not been resolved by
phone support and swapping boards. I would appreciate any suggestions
and advice while I wait for a service engineer.
Just for background, prior to our problem a student acquired about 48
hours of continuous acquisition (gs-TOCSY and gsNOESY, that look very
good after processing). After his experiment I set up a gsCOSY and and
noticed the lock had failed to be re-established. So after about 1 to 2
minutes when running a gradient experiment the lock will drop and not
return back to its previous level. There are no error lights on. I can
not re-lock the sample unless I initialize the BSMS. If I decrease the
gradient level from 10% to 1% I can delay re-locking failure. Here is
what I have replaced:
LCB on the BSMS (no effect)
HPPR cover module (no effect)
GCU on the AQR (no effect)
TCU on the AQR (no effect)
2H HPPR module (no effect)
Now for what did have an effect:
When I replaced the GAB board (first time) I could not communicate with
the BSMS. Switched tty connections and still could not communicate with
BSMS. Swapped my GAB board back in and now I could not communicate with
it, after swapping tty connections!! I also had to disconnect and
reconnect the tty connection to the LCB board due to a problem when
trying to read in shim files (message: checking rs-channel). So Bruker
sent me another GAB board, think the first one may be bad, and it
behaved the same way. I swapped my GAB board back in and lost
communication with it and nothing worked to re-establish communication
with the BSMS. I then noticed the 10V light was dim on the CPU board on
the BSMS. I replaced the CPU board on the BSMS and now have
communication with the BSMS.
I am reluctant to try the GAB board again since it may kill the BSMS CPU
board. I guess it is better to have a half broker NMR than a completely
broken NMR. Do you think a tty problem could cause one to lose the lock
in a gradient experiment and then not be able to re-lock unless the BSMS
is reinitialized?? I would appreciate any advice?
---------------------------------
Dr. Marcus Wright
NMR Lab Manager
Wake Forest University
Chemistry Department, Salem Hall
Winston-Salem, NC 27109-7486
(336)-758-4656 Fax
(336)-758-5981 Office
(336)-758-4707 NMR Lab
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Received on Fri Nov 16 2001 - 09:38:37 MST