Waters 600e - Page 148

Troubleshooting the 600E System 123
Erratic flow
rate/pump pulsa-
tions
(continued)
Dirty or malfunc-
tioning check
valve(s)
To determine if the symptom is due to a problem
with the inlet or outlet check valve, refer to
Section 5.4, Advanced 600E Pump Testing. If neces-
sary, replace the check valve as described in
Section 4.2.6, Cleaning and Replacing Pump Check
Valves .
Ensure eluent is properly filtered to prevent addi-
tional precipitation.
Buffer precipitation in a check valve can occur when
running a mixture of buffer and an organic eluent in a
concentration of 50% or higher. The actual degree of
precipitation can vary depending on the organic
eluent and the buffer in use.
Eluent inlet filter or
inlet lines blocked
Check lines for blockages. Replace if necessary.
Clean the eluent inlet filter frit by attaching to a
priming syringe and drawing methanol through in
both directions.
Gradient propor-
tioning valve failure
Contact Waters Technical Service.
Pump plunger seal
leaking (under
pump head)
Replace pump plunger seal (see Section 4.2.4,
Replacing the Plunger Seal).
Worn pump plunger Replace the plunger (see Section 4.2.5, Cleaning and
Replacing the Pump Plunger).
Immiscible eluents
in pump head
Refer above to Corrective Action for “Pump not
delivering eluent” symptom.
Pump head
cavitation
Refer above to Corrective Action under “Pump not
delivering eluent” symptom.
Pump electronics
failure
Contact Waters Technical Service.
Inadequate eluent
blending
Immiscible eluents
in pump head
Set up eluent reservoirs as described in Section 2.2.1,
Setting Up the Eluent Reservoirs.
Gradient propor-
tioning valve failure
Contact Waters Technical Service.
Table 6-1 600E System Troubleshooting (Continued)
Symptom Possible Cause Corrective Action