Roland VersaCamm VS-640 Service Notes page 233

If the MAX voltage is not proper, refer to the voltage dis-
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played in [ ] on the lower screen. Adjust the VR on the Tool
Carriage Board so that the voltage in [ ] to be 2.7 +/-0.2V.
Because of the ink dry, the voltage displayed in [ ]
decreases in time. Perform this operation quickly for
the adjustment is done smoothly
Perform [OUTLEVEL CHECK] again and confirm that the
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MAX voltage is proper.
If the voltage is not proper, adjust the voltage again.
Min2.5V Max2.7V
[2.5V]
4-35
VR
Min2.5V Max2.7V
[2.5V]