Agilent Technologies 1100 Series Service Manual page 94

2 Troubleshooting and Test Functions
Third plateau negative or unstable and at least one other plateau positive
Potential Cause
Air in channel A or new seals not yet seated.
Loose active inlet valve in channel A.
Loose pump head screws in channel A.
Loose outlet valve in channel A.
Leaking seal or scratched plunger in channel A1. Exchange the pump seals in channel A. Check
Defective active inlet valve in channel A.
82
Corrective Action
Flush channel A thoroughly with isopropanol
under pressure (use restriction capillary).
Tighten the active inlet valve in channel A
(14mm wrench). Do not overtighten!
Ensure the pump head screws in channel A 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 A.
1100 Series Nano Pump Service Manual