18 Agilent 7890 Series Troubleshooting
2 ALS and Detector Symptoms
Plunger Errors
If the ALS reports a front or back plunger error, check the
following possible causes:
• The syringe plunger is sticking or is not securely connected
to the plunger carrier.
• The plunger solenoid is binding.
• The plunger carrier encoder is inoperable.
• The autoinjector plunger carrier mechanism will not move.
• The plunger does not move freely due to sample residue or
wear. Install a new syringe, making sure to prime the syringe
with solvent before installing.
Procedure
1 Remove the syringe and check it for plunger stickiness or
binding. Replace the syringe if necessary (7693A, 7650A,
7683).
2 Check the viscosity of the sample against the viscosity
parameter. Reset the viscosity parameter if necessary.
3 Restart the sequence.
4 If the error occurs again, obtain Agilent service.
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