Ricoh Aficio SP C232DN Operating Instructions Manual page 70

D
Pinch the front end paper guide and slide it inward to match the standard size.
When loading custom size paper, position the paper guide slightly wider
than the actual paper size.
E
Load the new paper stack print side up.
Make sure paper is not stacked higher than the upper limit (upper line)
marked inside the tray.
Slide the guides inward, until they are flush against the paper's sides.
ASH141S
ASH126S
ASH140S
Loading Paper
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