My NMR Notes:

11/2/2004  Solvent Suppression----Suppress two solvent peaks on INOVA600

De-Energize QE300 Magnet

ALOX_300 Magnet

Vacuum Pump Operation

Power Supply and Shim Power Supply

Qtune on INOVA NMR System

Varian Service ID

Varian Probe Specification

Q&A from Varian Experts:

1001 - 1020

• Shimming Techniques and Homogeneity Problems.
• How do I restart communication between the Sun host computer and the console?
• How do I restart communication between the Sun host computer and the printer?
• Why can't I get the configuration window to open?
• My VNMR window is broken, and the message "last menu not found" appears.
• How do I change window size and background colors?
• What is the password for gradient shimming and other special features?
• How do I obtain patches for Solaris and VNMR? How do I load them?
• My floppy drive doesn't work?
• Why can't I print on a Lexmark printer?
• How can I install a second hard disk?
• How can I get the correct partial integral display?
• Sample cannot eject, ejects too fast, or does not spin
• No lock signal displayed on screen (INOVA and UNITYplus
• No lock signal displayed on screen (UNITY and VXR)
• No lock signal displayed on screen (MERCURY)
• No lock signal displayed on screen (GEMINI 2000)
• No NMR spectrum or noise only on the screen
• Magnet is iced up or forming ice from the neck tube
• Flow meter gauge reading is very high
• Reading diagnostic messages from console

1020 - 1030

• Recovering from forgetting the root password
• No decoupling or partial decoupling only
• VT is not responding or not heating
• Probe has water and/or air has water
• Why do I get error messages at shutdown?
• How do you fix a HeartBeat not found error?
• Why doesn't the Print button work in the VNMR Config window?
• How do I 'unlock' an experiment that is 'locked'?
• In CDE, the color of VNMR window flashes. What do I do?
• SGI trying to run VnmrX remotely fails with error message 'Could not load ....'

1100 -

• Intermittent gain and/or phase problem.
• Image or center peak on the spectrum.
• Consistent spikes in spectrum.
• Cannot tune probe.
• Noisy baseline (NMR signal is present).
• NMR signal or z0 is changing daily.
• WALTZ birdies when doing WALTZ decoupling.
• Observing the NMR signal from a second channel?
• Cannot do deuterium decoupling. (UNITYplus and INOVA only)
• Spectrum does not decouple with WALTZ.(XL,VXR, UNITY only).
   

1200-

• Lock signal freezes, acquisition window disappears, and system says number of points not equals to np.
• Lock signal freezes or is erratic.
• Sample does not insert or spin speed does not regulate.
• System hangs after running normally for several hours.
• System says FIFO underflow after taking acquisition.
• Cannot setup after bootup.
• System says setup completed, but no normal relay clicking sound.
• Differential Box causes Sun workstation to hangup.
• Cannot do decoupling or cannot control decoupler power.
• Spectrum has birdies everywhere with pw=0.

1300-

• No response or control on any shimming gradients.
• No response or cannot shim on one of the five knobs.
• Z3 and Z4 are very sensitive.
• A big hump on one side of the lineshape.
• The lock signal is locking negative instead of positive.
• Cannot get rid of the sidebands.
• Ringing on the base of the lineshape.
• Z0 is always shifting back and forth.
• Some of the non spin gradients are very sensitive.

1400-

• My Gemini console beeps, system does not start
• My XL, VXR, Gemini (w/o Sun Host computer) system does not bootup.
• The computer says setup is complete, but the console hardware is not setup.
• What is the maximum ripple voltage for the console power supply?
• System stops working after a few minutes.
• The console fan area is very noisy.
• The main switch is up, but the system is not running.
• What are the RF and digital supply voltage specification tolerances?
• The power supply indicator does not light or is very dim.