03-914978-00:1
131
Troubleshooting
Check for an Open Filament
Diagnostics will determine is one or both filaments are open. If only one filament
is open, enter System Control. Click on Set Points. Under Filament Selection,
select the other filament.
If both filaments are open, shut down the instrument. Then check the filament
continuity and wire connections after you have removed the ion trap assembly
from the manifold.
•
If necessary, replace the filaments.
Check the Turbomolecular Pump
Diagnostics Vacuum test will determine if the Turbomolecular pump speed
reading is at least 100
±
2%, or if the Diffusion pump has a fault present
Make sure the pump speed reading is at least 100
±
2%.
•
If it is not, inspect cooling fans for proper operation.
Check the RF Adjustment
Check whether an RF adjustment is needed (particularly after you have changed
the ion trap temperature), proceeding as follows:
1. Open System Control.
2. Click on Adjustments, and select Adjust RF Ramp.
3. Adjust the RF ramp by turning the RF tuning screw.
4. Adjust the RF ramp until the highest value is minimized.
Check the Parameter Settings
Check whether you have set inappropriate method parameters, proceeding as
follows:
1. Enter System Control. Click on Auto Tune and select Electron Multiplier
Tune. Click on Start Auto Tune.
2. Click on Air/Water Check and Start Auto Tune. If air and/or water levels are
out of range, go to section on Air/Water leaks to troubleshoot these
problems. If a spectrum is present, enter Method Editor and check if
•
You specified the EI ionization mode.
•
Make sure that the ionization storage level permits storage in the trap of
the ions selected in the scan range.
3. If you are unsure of appropriate levels, then reset parameters by clicking on
the Defaults button in each section.
•
Save your method file as Default.
•
Activate Default file, turn on trap and Cal gas. Check for cal gas
spectrum.
4. If the spectrum returns, note which parameter(s) were causing the problem. If
no spectrum is present, and the trap was recently disassembled, the
assembly of the trap must be checked.
