Nikon LS4000 - Manual (Page 151)

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When rotating the rollers, turn the toothed wheel slowly with the ball of your thumb. Do not
use force or attempt to turn the wheel with a screwdriver or other rigid object, as this could
deform the wheel.
Toothed wheel
Rollers
Roller frame
Work with the adapter and scanner on a table or other flat, stable surface. The adapter or
scanner could be damaged should either fall to the floor.