ML 3390/3391
SEL
SEL
MENU
LF
SHIFT
FF/LOAD
Micro Feed
Down
POWER ALARM
Micro Feed
PRINT QUALITY
Up
GROUPEXIT
ITEM SET
QUIETPARKTEAR
LQ
COURIER
TOF
MENU
UTILITY
PRINT
PRESTIGE
CHARACTER PITCH
10 12 15
17
20 PROP
English
GOTHIC
ROMAN
ORATOR
SWISS
Help Guide
Every eff ort has been made to ensure that the information in
this document is complete, accurate, and up-to-date. Oki
assumes no responsibility for the results of errors beyond its
control. Oki also cannot guarantee that changes in software
and equipment made by other manufacturers and referred to
in this guide will not affect the applicability of the information
in it. Mention of software products manufactured by other
companies does not necessarily constitute endorsement by
Oki.
© 1995 by Oki. All rights reserved.
First edition January 1996.
Written and produced by the Documentation Department.
Oki and Microline are registered trademarks of Oki Electric
Industry Company, Ltd.
Energy Star is a trademark of the United States En vironmental
Protection Agency .
Epson is a registered trademark of Epson America, Inc.
IBM is a registered trademark of International Business
Machines Corp.
Energy Star
As an Energy Star Partner, Oki
has determined that this product
meets the Energy Star guidelines
for energy efficiency.
Safety
Your printer has been carefully designed to give you years of safe,
reliable performance. As with all electrical equipment, there are a
few basic precautions you should take to avoid hurting yourself or
damaging the printer:
• Read the setup and operating instructions carefully. Be sure
to save them for future reference.
• Read and follow all warning and instruction labels on the
printer itself.
• Unplug the printer before you clean it. Use only a damp cloth;
do not use liquid or aerosol cleaners.
• Place your printer on a firm, solid surface. If you put in on
something unsteady , it might fall and be damaged; if you place
it on a soft surface, such as a rug, sofa, or bed, the vents may
be blocked, causing it to overheat.
• To protect your printer from overheating, make sure no
openings on the printer are blocked. Do not put the printer on
or near a heat source, such as a radiator or heat register . If you
put the printer in any kind of enclosure, make sure it is well
ventilated.
• The printhead can get quite hot when it has been printing for
a length of time. Do not touch the printhead until it has had a
chance to cool off.
• Do not use your printer near water, or spill liquid of any kind
into it.
• Be certain that your power source matches the rating listed
on the back of the printer. If you are not sure, check with your
dealer or with your local power company.
• Your printer has a earthed, 3-pin plug as a safety feature, and
it will only fit into a earthed outlet. If you can not plug it in,
chances are that you have an older , non-earthed outlet; contact
an electrician to have it replaced with a earthed outlet. Do not
use an adapter to defeat the earthing.
• The outlet into which you plug your printer must remain easily
accessible at all times.
• To avoid damaging the power cable, do not put anything on it
or place it where it will be walked on. If the cable becomes
damaged or frayed, replace it immediately.
• If you are using an extension cable or power strip with the
printer, make sure that the total of the amperes required by all
the equipment on the extension is less than the extension’s
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iHelp Guide
rating. Generally, the total ratings of all equipment plugged
into any one power line should not exceed 13 amperes. Do
not exceed this unless you know that the power line your
equipment is plugged into has a rating above 13 amperes.
• Do not poke anything into the ventilation slots on the sides of
the printer; you could get a shock or cause a fire.
• Aside from the routine maintenance described in the manuals,
don’t try to service the printer yourself; opening the cover
may expose you to shocks or other hazards. Do not make any
adjustments other than those outlined in the manual, you might
cause damage requiring extensive repair work.
• If anything happens that indicates that your printer is not
working properly or has been damaged, unplug it immediately
and contact your Oki dealer for service. These are some of
the things to look for:
• The power cable or plug is frayed or damaged.
• Liquid has been spilled into the housing, or the printer
has been exposed to water.
• The printer has been dropped or its cabinet has been
damaged.
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• The printer doesn’t function normally when you are
following the operating instructions.
ii ML3320/21
Contents
Safety .................................................................................. i
Maintenance ....................................................................... 1
Replacing the Ribbon Cartridge ........................................ 1
Clearing Paper Jams .......................................................... 2
Rear-Feed Jams ................................................................. 2
Correcting Repetitive Rear-Feed Jams .............................. 4
Single-Sheet Jams.............................................................. 6
Cleaning the Housing ........................................................ 7
Troubleshooting................................................................. 8
Using Y our Printer ........................................................... 11
Print Mode: Indicator Lights ........................................... 11
Print Mode: Control Panel Keys...................................... 12
Selecting the Print Quality and Font ............................... 13
Selecting the Character Pitch .......................................... 14
Menu Mode: Control Panel ............................................. 14
Entering and Exiting the Menu Mode ............................. 15
Resetting the Menu.......................................................... 15
Printing the Menu Settings.............................................. 15
Summary of Menu Settings............................................. 16
Explanations of Menu Items............................................ 19
Paper Park Feature........................................................... 22
Specifications................................................................... 23
Index ................................................................................ 27
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iiiHelp Guide
English
iv ML3320/21
Maintenance
3. Remove and discard the used ribbon cartridge.
Replacing the Ribbon Cartridge
Note: For the best results, use genuine Oki ribbons.
1. Make sure the printer is turned OFF.
2. Centre the printhead (➊).
Caution! The printhead may be HOT!
➊
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4. Unpack the new ribbon cartridge.
Help Guide 1
5. Install the new ribbon cartridge.
6. Turn the knob (➊) in the direction of the arro w to take up
any ribbon slack.
➊
Clearing Paper Jams
Rear-Feed Jams
1. Turn the printer OFF and use the platen knob to back the
paper all the way out.
2. Open the access cover, and remove the pull-up roller
assembly.
2 ML3390/91
3. Remove any torn pieces of paper.
6. Turn the printer on.
4. Replace the pull-up roller assembly , and close the access
cover .
5. Reload paper.
7. Press FF/LOAD.
FF/LOAD
Micro Feed
Up
ITEM
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Help Guide 3
Correcting Repetitive Rear-Feed Jams
QUIETPARKTEAR
SET
PRINT
TOF
PRINT QUALITY
CHARACTER PITCH
HSD
NLQ
UTL
SSD
10 12 15
17
20 PROP
If the paper keeps jamming, you probably have bits of paper
stuck in the paper path.
3. Fold some continuous-form paper over three times to
make a page four sheets thick, load it on the tractors and
close the covers.
1. Perform steps 1 through 3 under “Rear-Feed Jams.”
2. Grasp the paper separator (➊), lift it slightly, pull back
on it, then swing it forward.
➊
4. Swing the paper separator over, and use the platen knob
to draw the quadruple-thick page around the platen: this
SEL
SEL
MENU
LF
SHIFT
FF/LOAD
Micro Feed
Down
POWER ALARM
Micro Feed
PRINT QUALITY
Up
GROUPEXIT
ITEM SET
QUIETPARKTEAR
HSD
UTL
TOF
MENU
NLQ
PRINT
SSD
CHARACTER PITCH
10 12 15
17
20 PROP
4 ML3390/91
brings out any jammed bits of paper.
5. Remove the paper pieces, and use the platen knob to back
the paper out.
FF/LOAD
Micro Feed
PRINT QUALITY
Up
QUIETPARKTEAR
TEM SET
HSD
UTL
TOF
MENU
NLQ
PRINT
SSD
CHARACTER PITCH
10 12 15
17
20 PROP
6. Swing the paper separator over , reload re gular paper , and
lower the paper separator back into place.
7. Replace the pull-up roller assembly , and close the access
cover .
8. Turn the printer on.
9. Press FF/LOAD.
FF/LOAD
Micro Feed
Up
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Help Guide 5
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