Konica Minolta magicolor 1690MF - Manual (Page 266)

Duplex Option 10-7
Duplex Option
Duplex (Double-Sided) printing can be performed automatically with the
duplex option installed.
For details, refer to “About Duplex Printing” on page 3-22.
In order for the duplex option to be installed, either of the following must be
installed on the machine.
z Tray 2
z Attachment
Kit Contents
"
If Tray 2 is installed, it is not necessary to install the attachment. In this
case, skip “Installing the Attachment”, and continue with “Installing the
Duplex option” on page 10-9.
Duplex option Attachment