Ricoh Aficio SP 5210DN Hardware Manual page 123

To avoid paper jams, make sure the tray is securely inserted.
Specifying paper size automatically for a standard or optional paper feed tray
1. Press the [Menu] key.
2. Press the [ ] or [ ] key to select [Paper Input], and then press the [OK] key.
3. Press the [ ] or [ ] key to select [Paper Size: (tray name)], and then press the [OK] key.
4. Select [Auto Detect] using the scroll keys, and then press the [OK] key.
5. Press the [Menu] key to return to the initial screen.
• For details about the available paper sizes, see p.101 "Supported Paper for Each Tray".
CEC216
Loading Paper in Trays
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