1100 Series Nano Pump Service Manual 117
Repairing the Pump 3
Exchanging the EMPV Assembly
Exchanging the complete EMPV
1 Turn the pump off.
2 Remove the pump from the stack and remove the top cover and foam.
3 Using a 1/4 inch wrench disconnect the capillaries:
• going to the flow sensor.
• coming from the filter.
4 Disconnect the waste tube. Beware of leaking solvents due to hydrostatic
pressure.
5 Disconnect the EMPV connector (P9) on the main board see Figure 22 on
page 135.
6 Using a hex key, unscrew the complete EMPV and remove it.
7 Screw a new one in place.
8 Reconnect the capillaries:
• going to the flow sensor.
• coming from the filter.
9 Run the EMPV test see "EMPV Test" on page 84.
Frequency If valve internally leaking
If unstable column flow in micro mode
If column flow and system pressure drops from time to time.
Tools required Wrench 1/4 inch
Wrench 14 mm
Wrench 7/16 inch
Parts required EMPV assembly G1361-60000
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