78 1100 Series Nano Pump Service Manual
2 Troubleshooting and Test Functions
No pressure increase or minimum pressure of plateau 1 not reached
Potential Cause Corrective Action
Pump not running. Check the logbook for error messages.
Wrong solvent-line connections to solvent
selection valve.
Ensure the solvent lines from the degasser to
the solvent selection valve are connected
correctly.
Loose or leaky fittings. Ensure all fittings are tight, or exchange
capillary.
Large leaks (visible) at the pump seals. Exchange the pump seals.
Large leaks (visible) at active inlet valve, outlet
valve.
Ensure the leaky components are installed
tightly. Exchange the component if required.
Pressure limit not reached but plateaus horizontal or positive
Potential Cause Corrective Action
Degasser and pump channels A and/or B not
flushed sufficiently (air in the channels).
Purge the degasser and pump channels
thoroughly with isopropanol under pressure
(use the restriction capillary).
Wrong solvent. Install isopropanol. Purge the degasser and
pump channels thoroughly.
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