Oki 391 - Manual (Page 15)

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User’s Guide: English 15
Parts Identification
The parts identified here are parts of the unit that you will use
during normal operation.
For accessories (consumables, options, replacement parts, and
documentation), refer to “Accessories.”
Printer Serial Number
The serial number of your machine is on a label on the back
of your machine.
The label says “S/N.”
An example serial number is: 401A0154693.
! You will need your printer serial number if your
machine requires servicing.
A written receipt for the product, showing the date of
purchase, dealer’s name, and both the model and serial
numbers of the product must accompany any request or
claim for work to be performed under Limited
Warranty.