Agilent Technologies 1100 Series Service Manual page 95

Fourth plateau negative or unstable and at least one other plateau positive
Potential Cause
Air in pump chamber of channel B or seals not
yet seated.
Loose active inlet valve in channel B.
Loose pump head screws in channel B.
Loose outlet valve in channel B.
Leaking seal or scratched plunger in channel B1. Exchange the pump seals in channel B. Check
Defective active inlet valve in channel B.
1100 Series Nano Pump Service Manual
Troubleshooting and Test Functions
Corrective Action
Flush channel B thoroughly with isopropanol
under pressure (restriction capillary).
Tighten the active inlet valve in channel B
(14mm wrench). Do not overtighten!
Ensure the pump head screws in channel B are
tight.
Ensure the sieve in the outlet valve is installed
correctly. Tighten the outlet valve.
the plungers for scratches. Exchange if
scratched.
Exchange the active inlet valve in channel B.
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