Ricoh All in One Printer Operating Instructions Manual page 88

Adding Paper and Replacing Print Cartridges
J
Press down the right side of the side fence lock to release the fence.
K
Press the release lever and, without letting go of the lever, adjust the side
fences according to the size of paper to be loaded.
6
L
Press the metal plate down until it clicks.
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AMH032S
AMH033S
AMH039S