Roland SOLJET Pro III XC-540 Service Notes page 195

Insert a wrench through the holes on the side frame
8
prepared for the adjustment, and loosen the two screws
to make a gap of 3mm 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 machine.
Turn the adjustment screw shown in the figure to adjust
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the value of the tension gauge to be around 1.05kgf
with the procedure of 6 .
Turn the screw CW: Tension is increased
Turn the screw CCW: Tension is decreased
Tighten the two fixing screws shown in the figure, and
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again confirm that the tension is within the proper value.
Tighten the two screws shown in the figure to slightly
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contact with Idle Pulley Holder.
Make sure not to tighten the screws too
tight. It may move the fixed Idle Pulley Holder
accidentally.
Move on to [4-16 BELT POSITION ADJUSTMENT].
SCREW
ADJUSTMENT SCREW
SCREW
4-64
3mm
IDLE PULLEY HOLDER
FIXING SCREW