Roland VersaEXPRESS RF-640 Service Notes page 177

Remove the Rear Ink Cartridge
4
Cover
by removing the 7 screws as shown.
Disconnect the cables wired to the Choke Valve.
5
All connectors are the same type. Make sure
not to mix up if you disconnect two or more
connectors at the same time.
Remove the tubes connected to the top and bottom of the
6
Choke Valve.
In order to avoide the ink spatters, overlaying
waste cloth or paper under the Choke Valve Unit
is recommended.
Replace the Choke Valve by removing two screws as show.
7
< Rear View >
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Rear Ink Cartridge Cover