Waters Xevo G2-XS QTof Overview And Maintenance Manual page 213

To avoid damaging the heater cartridge assembly wires,
Notice:
do not bend or twist them when removing the assembly and
ceramic heater mounting block from the ion block.
6. Carefully remove the PEEK terminal block and ceramic heater
mounting block, complete with heater cartridge assembly, from the ion
block.
You can invert the ion block assembly to facilitate this process.
Tip:
Ceramic heater
mounting block
7. Use the combined 2.5-mm Allen wrench and cone extraction tool to
loosen the 2 screws securing the heater wires to the PEEK terminal
block.
8. Disconnect the heater cartridge wires from the PEEK terminal block.
Replacing the ion block source heater
Heater cartridge wire
securing screws
PEEK terminal block
April 2, 2015, 715004496 Rev. B 213