174 Installation, Operation, and Maintenance
Part 3, Maintenance and Troubleshooting
10 Troubleshooting
Symptom: No Signal/No Peaks
Table 3 0 Signal/Peak problems
Possible cause Action
Syringe plunger is malfunctioning. Verify that the syringe plunger is secured by the plunger
screw. If the plunger screw is loose, tighten it. See“Installing
a Syringe” on page 103.
Check the syringe needle for plugging. If the syringe is
plugged, replace or clean the syringe.
Sample level is too low in vial. If there is no or very little sample in the vial, the needle may
not be able to reach it. See “Filling sample vials” on page 112.
Alternately, you may edit your method to adjust the needle
sampling depth. See Sampling offset in “Setting Injector
Parameters on a 6890 GC” on page 87.
Sample is viscous. If the sample is viscous, try the following:
• Increase the viscosity delay time.
• Use the tray quadrants to warm the sample.
• Dilute the sample in an appropriate low-viscosity
solvent.
• Turn the tower fan off.
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