Introduction > 7
I
NTRODUCTION
Congratulations on purchasing this printer!
This printer series is designed to provide highly reliable letter quality printing and high 
resolution graphics for the desktop/office printing environment. It combines state-of-the-
art, 9-pin (ML3320ECO/ML3321ECO) and 24-pin (ML3390ECO/ML3391ECO), serial impact 
dot matrix printing technology with advanced materials and superior construction to 
provide high performance and versatility in a desktop sized unit. Careful attention to 
ergonomics and application needs provides user friendly operation for operators of varying 
technical capabilities.
A
BOUT
 
THIS
 
GUIDE
This manual is your user’s guide (check the web site, www.okiprintingsolutions.com, for the 
most up-to-date version) for your printer and forms part of the overall user support listed 
below:
> Installation Safety booklet: provides information as to safe use of the printer.
This is a paper document that is packaged with the printer and should be read before 
setting up your printer.
> Set-up guide: to describe how to unpack, connect and turn on your printer.
This is a paper document that is packaged with the printer.
> This User’s Guide: to help you to become familiar with your printer and make the 
best use of its many features. Also included are guidelines for troubleshooting and 
maintenance to ensure that it performs at its best.
This is an electronic document stored on the manuals CD.
> Network Configuration Guide: to provide detailed technical information for 
network administrators to configure the optional accessory network interface.
This is an electronic document stored on the CD that accompanies the network 
interface card optional accessory.
> On-line Help: on-line information accessible from the printer driver and utility 
software.
O
N
-
LINE
 
USAGE
This guide is intended to be read on screen using an Adobe Acrobat Reader. Use the 
navigation and viewing tools provided in Acrobat.
You can access specific information in two ways:
> In the list of bookmarks down the left hand side of your screen, click on the topic of 
interest to jump to the required topic. (If the bookmarks are not available, use the 
“Contents” on page 4.)
> In the list of bookmarks, click on Index to jump to the Index. (If the bookmarks are 
not available, use the “Contents” on page 4.) Find the term of interest in the 
alphabetically arranged index and click on the associated page number to jump to 
the page containing the term.