Roland VersaEXPRESS RF-640 Service Notes page 213

Loosen the two Fixing Screws which is located on the left
4
end of the belt halfway round.
Be careful with the sharp edges around the belt
when loosening the screws. It may cause injury.
Insert a wrench through the holes on the Side Frame and
5
loosen the two screws to make a gap of three millimeters
between the tip of the screw and Idle Pulley Holder.
(The belt tension cannot be adjusted higher when the
screw contacts with Idle Pulley Holder.)
The gap between the screws and Idle Pulley can be
seen from both front side and rear side of the ma-
chine.
Turn the Adjustment Screw as shown in the fi gure to adjust
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the value of the tension gauge within acceptable range refer-
ring to 3 .
Turn the screw CW: Tension is increased
Turn the screw CCW: Tension is decreased
Tighten the two Fixing Screws shown in the fi gure, and again
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confi rm that the tension is within the proper range.
<Top view>
ネジ
Screws
Adjustment
Screw
4-34
Fixing Screw
Fixing Screw
3mm
Idle Pulley Holder
Fixing Screw
Fixing Screw