Waters 2707 Operator's Manual page 75

Following are number of causes and possible solutions for analysis problems.
For further help, contact Waters Service.
When reproducibility fails to meet specifications, check the following:
Cause
Air in flow path
Leaking syringe
Leaking syringe valve
Rotor seal worn out
Dead volumes in tubing
connections
Broken degasser
If a blank gives a peak too high for the criteria:
Cause
Solubility problem
Contaminated blank
Solution
Perform an initial wash by clicking "Wash needle"
in the 2707 Console or using the control panel.
If leakage occurs at the top of the syringe,
determine whether the syringe is mounted
properly and that its gasket is in place.
If leakage occurs at the bottom of the syringe,
replace the syringe or plunger tip.
Inspect the valve and replace if needed.
Replace the seal. Inspect the stator.
Redo connections with new ferrules and nuts.
Repair the component, and confirm operation.
Solution
Modify the sample or wash solution.
Use a new blank.
Conducting analytical troubleshooting 4-5