Canon imageRunner 400 Reference Manual page 64

Changing the Copy Ratio (Enlarging/Reducing Originals)
Specifying the Copy Ratio by Number of Output Pages
1
Place your original and press the [ZOOM] key.
2
Press the [MULTI-PG ENLARGE] key.
3
Press the [NUMBER OF OUTPUT PGS]
key, then press the [OK] key.
4
Press the [PAPER SELECT] key.
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