Agilent Technologies 1100 series Reference Manual page 100

Troubleshooting and Test Functions
Evaluating the Results
Second plateau negative or unstable, and at least one other plateau
positive
Potential Cause
Leaking outlet valve in channel B.
Loose pump head screws in channel B.
Leaking seal or scratched plunger in channel
B2.
100
Corrective Action
Clean the outlet valve in channel B. Ensure
the sieve in the outlet valves are installed
correctly. Tighten the outlet valve.
Ensure the pump head screws in channel B
are tight.
Exchange the pump seals in channel B. Check
the plunger for scratches. Exchange if
scratched.