I followed these instruction I got from a member here.
Turn off and unplug the machine.
Hit the green button a few times and wait 15 mins to discharge everything.
Take off the front cover (head and damper cover only – not the big top cover)
put some app paper on the platen and around the cables etc to protect from ink drops
slide the head over to the middle of the platen (there’s a latch on the right of the head assy)
remove the bracket that holds the head carriage. Just loosen the screws, the bracket then can be taken out.
pull the dampers – learn how to do this properly. pull straight up, don’t wiggle.
Make sure they are labeled for correct order.
wrap them up in a bag to stop drips, also try to not touch the left side of the damper, more ink will flow out if you do.
Undo the 2 toggle retainer screws, pull the latch back and lift the head out.
Careful not to scratch the underside of the head on the latch tab.
Pull the ribbon cables and head memory cable. Be very careful with these, they are very fragile.
remove the head and then reverse procedure.
Check if there’s a head rank written on it, you’ll need to input this later ( I didn’t do this so not sure how?)
I also didn’t bother with slant adjust as it looked pretty good. (if you choose to do a slant test you will need a loupe to magnify the dots.
Just did a drop position adjust and all good.
It’s pretty easy.
Hardest part was not getting ink everywhere when pulling the dampers