Roland VersaEXPRESS RF-640 Service Notes page 163

Open the Clamp as shown, remove the Ink Tubes form the
11
Clamp.
Pull the old Tube which end is not taped until the new Tube
12
reaches the Choke valve.
Peel off the tape connecting the Tubes, and remove the old
Tube from the new one.
Connect the new Tube to the Damper Joint, then fix the
13
Damper Joint to the Damper.
In the case of RF-640A, connect the new Tube to
the Y Joint.
When you connect the Ink Tube, the Ink Tube
may bend. Do not use any bent Ink Tubes.
Damper Joint
3-89
Head Side