Oki ES8453 MFP User Manual - page 644
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3.
While opening the tabs (2) on the paper feed roller in the front of
the paper cassette outward and slide the paper feed roller (3) to
the left to remove.
4.
While opening the tabs (4) on the paper feed roller in the back of
the paper cassette outward and slide the feed roller (5) to the left
to remove.
5.
Attach a new paper feed roller (with gear) to the axis in the back.
6.
Attach a new paper feed roller (without gear) to the axis in the
front.
643