Roland VersaCAMM VP-540 Service Notes page 196

Turn the Adjustment Screw as shown in the figure to adjust
6
the value of the tension gauge within acceptable range
refferring to step 3.
Turn the screw CW: Tension is increased
Turn the screw CCW: Tension is decreased
Tighten the 2 Fixing Screws shown in the figure, and again
7
confirm that the tension is within the proper value.
Tighten the 2 screws shown in the figure to slightly contact
8
with Idle Pulley Holder.
Move on to [4-15 BELT POSITION ADJUSTMENT].
Make sure not to tighten the screws too tight.
It may move the fixed Idle Pulley Holder
accidentally.
ADJUSTMENT
SCREW
SCREWs
4-55
FIXING SCREW
FIXING SCREW
IDLE PULLEY HOLDER