Kegel IKON Lane Machine Operation Manual page 56

To adjust the voltage meters accurately you
must have a dependable voltmeter. Locate
the three-pin plug above the fuse bank.
Put the voltmeter probes in the appropriate
pins then add or subtract using the buttons
at the bottom of the screen until the Voltage
on the screen matches the correct Voltage
from the external voltmeter.
Using the screen to the left, press on the Voltage
you want to adjust; the buttons will become
enabled and an adjustment reference number will
appear.
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