Waters ACQUITY UPLC Operator's, Overview And Maintenance Manual page 71

4. Ensure the inlet switching-valve is set to Waste.
To change the setting to Waste, click System and select Waste.
Tip:
Switching-valve cartridge:
2-mm hex screw
5. Use the 2-mm hex wrench to remove the hex screw at the 10 o'clock
position on the switching-valve cartridge.
6. Remove the switching-valve cartridge from the switching-valve
assembly by pulling it straight outward.
7. Label the inlet switching-valve cartridge.
8. Repeat step 1 through
9. For both inlet- and outlet switching-valve cartridges, ensure that the
groove in the cartridge housing aligns with the groove on the drive
clamp.
If the grooves fail to align, turn the drive clamp until they
Requirement:
do so, taking care to avoid scratching the drive clamp or housing.
Aligned grooves
Drive clamp
step 7 for the outlet switching-valve cartridge.
Switching-valve cartridge housing
Preparing the column compartments
Lock ring
Lock ring stop
Stator ID
67