Roland VersaEXPRESS RF-640 Service Notes page 144

Fix the Carriage Cover.
19
The positions of screws for fi xing the Carriage Cover are at
the left, right and top of the Carriage Cover.
The Carriage Cover has six screws.
Move the Head Carriage to the whole width of the Guide Rail several times to remove the slack in the Carriage Belt.
20
Then, carry out the following adjustments.
1. [4-8 BELT TENSION ADJUSTMENT]
2. [4-9 BELT POSITION ADJUSTMENT]
3. [4-4 LIMIT POSITION & CUT DOWN POSITION INITIALIZE]
3-70
Carriage Cover