Kyocera KM-4230 Instruction Handbook Manual page 12

4. Paper
Adjust the insert guides to match the size of the envelope.
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Open the envelope and, with the surface to be printed onto face up and the flap facing
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away from the printer as shown in the illustration, insert it into the stack bypass tray
along the insert guides until it stops.
* If a mistake is made in setting an envelope, the direction of printing and the surface
that printing is accomplished onto will not be as expected.
Press the Copier/Printer switching key to switch to the printer function screen.
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Press the "Custom sizes" key. The custom size setting screen will appear.
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Press the "–" or "+" key to select the desired width and length. The width can be
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adjusted between 3 7/8" - 11 5/8", and the length between 5 3/4" - 17".
Press the "End" key. The message display will return to the printer function screen.
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