Konica Minolta bizhub PRO C6501 Troubleshooting Manual page 36

(1) Adjust the side guides with both hands
If only one hand is used, only one side is moved and the side guide at the opposite sides
does not move smoothly and the center of the loaded papers may slightly moves.
Be sure to use both hands
during moving side guides
Read the indication and ensure
that the value is the same
between the indicators at the front
and rear
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