80 1100 Series Nano Pump Service Manual
2 Troubleshooting and Test Functions
First plateau negative or unstable, and at least one other plateau positive
Potential Cause Corrective Action
Leaking outlet valve in channel A. Clean the outlet valve in channel A. Ensure the
sieve in the outlet valves are installed correctly.
Tighten the outlet valve.
Loose pump head screws in channel A. Ensure the pump head screws in channel A are
tight.
Leaking seal or scratched plunger in channel A2. Exchange the pump seals in channel A. Check
the plunger for scratches. Exchange if
scratched.
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