Waters SYNAPT G2 Operator's, Overview And Maintenance Manual page 167

6. Using the needle-nose pliers, carefully swing the ring terminal tags out
of the terminal block.
7. Using the needle-nose pliers, gently grasp the heat-shrink tubing on the
heater cartridge assembly and slide the assembly out of the ion block.
Heater cartridge assembly
Ring terminal tag
Heat-shrink tubing
Replacing the ion block source heater 5-89