Ricoh Aficio 551 Copy Reference Manual page 160

Copying
B
Press the [Book] key.
2
C
Press the [Book 2 Sided] key.
D
Press the [Multi 2 Sided] key.
E
Press the [OK] key.
F
Select the paper.
G
Set your originals, then press the {Start} key.
Note
When placing one original on the exposure glass or in the document feeder
in Batch (SADF) mode, press the {#} key after all originals are scanned.
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