Kyocera TASKalfa Pro 15000c Advanced Operation Manual page 39

Daily Management and Maintenance > Changing Settings
Changing Paper Size Letter to A4
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Pull out the cassette.
Remove a screw for the length guide on the back side of the
cassette, insert the length guide into the "A4", and then fasten
the guide with the screw.
Remove a screw for the length guide on the front side of the
cassette, insert the length guide into the "A4", and then fasten
the guide with the screw.
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