Konica Minolta bizhub 421 - Manual (Page 58)

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Using copy functions 2
– Touching [Custom Size] will display the Custom Size screen, on which
you can select custom size previously registered. Touch the desired key.
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Detail
In order to specify a custom paper size in Enlarge Display mode, the custom
paper size must first be stored before entering Enlarge Display mode.
5
Touch [OK], and then touch [OK] in the next two screens that appear.
Otherwise, touch [Main Screen].
The Basic screen appears again.