Ricoh GR-C1 Series Service Training page 68

Duplex Printing as Default
The default setting for Duplex Printing in the printer driver
will be "On" when the driver is first installed.
The first printing job will be done in duplex mode unless
the customer modifies the printer driver settings first.
Slide 68
Duplex will be default for drivers on the CD-ROM, but not for drivers downloaded
from the web site.
For some features, duplex must be off. Users must be aware of this.
Environment
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GR-C1 Training