Firstly, turn off the whole machine power.
Instructions (may vary but the principle is the same):
Remove old part:
1. Unplug the wire between laser tube and laser power supply and take out from the hole, like below.
2.unfix the tube.
① Cut the white ribbon
② Remove the screws
3.drain the water away from the tube.
Install new part:
In order to ensure laser path correct, location of new tube should be the same with the old one.
Then fix the tube and wire.
SEE ATTACHED PDF FOR LEGACY INSTRUCTIONS AND INFO ON SPLICING HV WIRES.