OKI ML5591 Manual
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ML5590/91
user s gui e’d

PREFACE > 2
PREFACE
Every effort has been made to ensure that the information in this
document is complete, accurate, and up-to-date. The manufacturer
assumes no responsibility for the results of errors beyond its control.
The manufacturer 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 the manufacturer.
While all reasonable efforts have been made to make this document
as accurate and helpful as possible, we make no warranty of any kind,
expressed or implied, as to the accuracy or completeness of the
information contained herein.
The most up-to-date drivers and manuals are available from the Oki
Europe website:
http://www.okieurope.com
Copyright © 2003. All rights reserved.
Oki and Microline are registered trademarks of Oki Electric Industry
Company, Ltd.
Hewlett-Packard, HP, and LaserJet are registered trademarks of
Hewlett-Packard Company.
Microsoft, MS-DOS and Windows are registered trademarks of
Microsoft Corporation.
Other product names and brand names are registered trademarks or
trademarks of their proprietors.
As an Energy Star Program Participant, the manufacturer
has determined that this product meets the Energy Star
guidelines for energy efficiency.
This product complies with the requirements of the
Council Directives 89/336/EEC (EMC) and 73/23/EEC
(LVD) as amended where applicable on the
approximation of the laws of the member states relating
to electromagnetic compatibility and low voltage.

CONTENTS > 3
CONTENTS
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Features / Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Printer Drivers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Emulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Printer Drivers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Installing the driver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Using a Compatible Driver . . . . . . . . . . . . . . . . . . . . . . . 10
Interfaces - General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Connecting the USB Cable . . . . . . . . . . . . . . . . . . . . . . . 11
Using your printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Components: Rear Feed (Continuous Forms) . . . . . . . . . . . 13
Components: Top Feed (Single Sheets) . . . . . . . . . . . . . . . 13
Top of Form (TOF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Forms Tear-Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Setting Top of Form (TOF) . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Temporarily Changing the Top of Form . . . . . . . . . . . . . . . . 18
Resetting Top of Form to the Factory Default . . . . . . . . . . . 18
Forms Tear-Off Feature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Potential issues with software packages . . . . . . . . . . . 19
Changing the Forms Tear-Off Setting . . . . . . . . . . . . . . . . . 20
Manual Forms Tear-Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Paper Park. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Changing Paper Paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Continuous Forms to Single Sheets. . . . . . . . . . . . . . . . 21
Single Sheets to Continuous Forms. . . . . . . . . . . . . . . . 22
Printhead Gap. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Print Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Character Pitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Printer Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Emulations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Menu Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Menu Mode Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Entering and Exiting Menu Mode . . . . . . . . . . . . . . . . . . 30
Resetting the Menu to the Factory Defaults . . . . . . . . . 30
Printing the Menu Settings. . . . . . . . . . . . . . . . . . . . . . . 30

CONTENTS > 4
Printing all Menu Settings . . . . . . . . . . . . . . . . . . . . . . . 30
Changing the Menu Settings . . . . . . . . . . . . . . . . . . . . . 30
Menu Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Explanation of Menu Items. . . . . . . . . . . . . . . . . . . . . . . 35
Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Replacing the Ribbon Cartridge. . . . . . . . . . . . . . . . . . . . . . 43
Ribbon Cartridge Handling . . . . . . . . . . . . . . . . . . . . . . . 43
Loading Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Rear Feed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Top Feed (Single Sheets) . . . . . . . . . . . . . . . . . . . . . . . . 56
Clearing Paper Jams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Rear Feed Jams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Rear Feed, Repeating Paper Jams . . . . . . . . . . . . . . . . . 59
Single Sheet Paper Jams . . . . . . . . . . . . . . . . . . . . . . . . 62
Cleaning the Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Parts and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Printer Control Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Epson LQ Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
IBM Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Setting up your Printer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Installing the Ribbon Cartridge . . . . . . . . . . . . . . . . . . . . . . 84
Ribbon Cartridge Handling . . . . . . . . . . . . . . . . . . . . . . . 84
Power Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Computer Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Parallel (LPT), IEEE 1284 . . . . . . . . . . . . . . . . . . . . . . . . . 87
USB, Specification 1.1 Compliant . . . . . . . . . . . . . . . . . 87
Loading Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Testing the Printer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Oki contact details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

NOTES, CAUTIONS AND WARNINGS > 5
NOTES, CAUTIONS AND WARNINGS
NOTE
A note appears in this manual like this. A note provides additional
information to supplement the main text which may help you to use and
understand the product.
CAUTION!
A caution appears in this manual like this. A caution provides
additional information which, if ignored, may result in equipment
malfunction or damage.
WARNING!
A warning appears in this manual like this. A warning provides
additional information which, if ignored, may result in a risk of
personal injury.

INTRODUCTION > 6
INTRODUCTION
>Extremely reliable, durable operation: 20,000 hours Mean
Time Between Failures (MTBF) at 25% duty cycle and 35%
page density.
>Advanced paper handling, with built-in rear push tractor and
zero-tear forms capability.
>Very high print speeds:
>High Speed Draft (HSD) Mode: 420 cps
>Utility Mode: 315 to 472.5 cps
>Letter Quality (NLQ) Mode: 105 to 210 cps
>This rugged 24-pin printer can meet the needs of harsh and
demanding environments.
FEATURES / TIPS
Forms Tear-Off
The Forms Tear-Off feature allows a printed continuous forms page to
be torn off without wasting paper or adjusting the printer.
When printing stops, Forms Tear-Off automatically moves the paper to
align the perforation with the tear bar (located under the access
cover), after a time interval which you select through the menu.
Paper remains in the tear-off position until the printer receives more
data. Then, the paper moves back down for printing.
This feature has to be enabled.
Paper Park
Your printer’s Paper Park feature allows you to print a single sheet
(cut-sheet) page without removing continuous feed paper from the
printer.
For more information, see “Paper Park” in “Using your Printer”.

INTRODUCTION > 7
Top of Form (TOF)
Top of Form (TOF) sets the print start position. The factory default is 1"
from the top.
The TOF can be changed in increments of 1/144", for a single print job
or set to a new default. The overall amount of adjustment is limited to
avoid paper jams.
The first line prints at the red line of the plastic paper shield (1) on the
printhead.
For more information, see “Top of Form (TOF)” in “Using your Printer.
Turning the Platen Knob
Always turn the printer off before turning the platen knob! If you turn
the platen knob when the printer is on, the Top of Form will misalign.
NOTE
The Forms Tear-Off and the Top of Form settings interact. For more
information, see “Top of Form (TOF) and Forms Tear-Off” in “Using your
Printer”.
1

INTRODUCTION > 8
Controlling Access to the Printer
>You can control access to the printer by changing the setting
for the Operator Panel Function in the Menu from Full
Operation (the factory default) to Limited Operation.
>When Limited Operation is selected, the PRINT QUALITY and
CHARACTER PITCH keys don’t work. This prevents these
settings from being changed from the control panel when
several people are using the printer.
For more information, see “Changing the Menu Settings” in “Using your
Printer”.

PRINTER DRIVERS > 9
PRINTER DRIVERS
EMULATIONS
The factory default emulation for your printer is Epson LQ.
If you wish to change to one of the IBM emulations, see “Using your
Printer”.
PRINTER DRIVERS
The Oki driver for your printer is provided on the CD included with the
printer. You can either load the Oki driver or select one of the
compatible drivers listed below in your software application.
1. Insert the CD into your CD-ROM drive.
2. Select your Language.
3. When the Menu Installer window appears, click the Driver
Installation button.
4. Follow the on-screen instructions.
INSTALLING THE DRIVER
1. When the [Add Printer] window appears, click [Next].
2. Select the directory on the CD where the drivers are located.
on the Oki CD they are situated in:
X:\Drivers\WinVer\CodePage
where
X:
is CD drive letter;
NOTE
If the CD does not AutoPlay, click Start → Run → Browse, then browse
to your CD-ROM drive, double-click Install.exe and click OK.
NOTE
Installation of the Oki USB driver is only required for Windows 98. You
may be called upon for your original Windows 98 CD. Please have this
available.

PRINTER DRIVERS > 10
WinVer
is the Windows versions, and
CodePage
is the selected
option.
3. After files have finished copying, click [Finish].
4. Switch your printer ON.
USING A COMPATIBLE DRIVER
The drivers below are listed by decreasing
compatibility with your
printer.
Use one as close to the top of the list as possible.
Epson LQ
lEpson LQ680
lEpson LQ1170/570
lEpson LQ 1050
IBM Proprinter
lIBM Proprinter X24 —
factory setting
lIBM Proprinter XL24e
lIBM Proprinter III
INTERFACES - GENERAL
Your printer is equipped with a selection of data interfaces:
Under no circumstances attempt to use both parallel and USB ports
simultaneously.
1. Parallel – For direct connection to a PC. This port requires a
bi-directional (IEEE 1289 compliant) parallel cable.
2. USB – For connection to a PC running Windows 98 or above
(not Windows 95 upgraded to Windows 98) or Macintosh.
Windows NT 4.0 does not support USB. Administrator
privileges are necessary for Windows 2000 and Windows XP
installations.
NOTE
To find out more about Code pages, see Help on the Oki CD Browser.

PRINTER DRIVERS > 11
This port requires a cable conforming to USB version 1.1 or
above. A genuine cable displays the Trident symbol on both
connectors.
Using an inferior cable can cause printing problems and
special cables are needed for longer runs than five metres.
The operation of a printer is not assured if a USB compatible
device is connected concurrently with other USB compatible
machines.
When connecting multiple printers of the same type, they
appear as *****, ***** (2), ***** (3), etc. These numbers
depend on the order of connecting or turning on each printer.
CONNECTING THE USB CABLE
Due to the number of possible variants of operating systems it is not
possible to describe every combination.
Terminology may vary between Windows operating systems and some
knowledge is assumed. If you are unsure how to proceed, you should
consult your computer documentation or system manager for details.
This example uses Windows 2000 Professional.
1. Ensure the printer and computer are easily accessible and turn
both units off. This is not strictly necessary but may prevent
any problems being caused by the accidental dislodging of
power or other cables.
2. Plug the Series A Male connector (a) into
the computer’s USB port or into a
suitable USB hub.
3. Plug the Series B male connector (b) into
the printer’s USB port.
4. Switch on both the computer and printer.
a
b

PRINTER DRIVERS > 12
5. The printer will be identified
immediately by the New Hardware
Wizard and install itself in the Printer
folder. An additional item, USB Printing
Support will also appear in the Device
Manager each time the printer is
switched ON and connected.
6. Check that the default paper size has
been correctly set by looking at the
settings in the Settings > Printers folder.
Under the printer's Properties > General
tab, the current paper selection is
shown. The printer picks up its initial
setting from the Locale settings on the
host computer. The paper size can be
altered by using the drop down arrow
and selecting an alternative size.
7. If the printer had formerly been used as a parallel or serial
device and there is no output from the printer once a USB
cable has been connected, check to see that the correct port
has been selected. This information can also be found in the
Properties folder but under the Ports tab. Amend as necessary.
8. If there are printing problems, check to see whether there is a
USB connection active in the Control Panel. If there is no USB
connection shown, you must install the hub.
9. Alternatively, there may be a problem if the printer is
connected via a USB hub. Disconnect the printer cable from
the hub and connect it directly to the computer.

USING YOUR PRINTER > 13
USING YOUR PRINTER
COMPONENTS: REAR FEED (CONTINUOUS FORMS)
The serial number of your printer is on a label fixed to the back of the
printer.
COMPONENTS: TOP FEED (SINGLE SHEETS)
1. Sheet Guide 5. Control Panel
2. Paper Lever 6. Acoustic Cover
3. ON-OFF Switch 7. Access Cover
4. Platen Knob
1. Paper Guides 5. Platen Knob
2. Sheet Guide 6. Control Panel
3. Paper Lever 7. Acoustic Cover
4. ON-OFF Switch
NOTE
For single sheet printing, the paper lever must be in the middle position.
1
2
3
4
5
67
1 2
3
4
5
6
7

USING YOUR PRINTER > 14
TOP OF FORM (TOF)
Top of Form (TOF) sets the print start position. The factory default is 1"
from the top.
The TOF can be changed in increments of 1/180", for either a single
print job, or all print jobs. The overall amount of adjustment is limited
to avoid paper jams.
The first line prints at the red line of the plastic paper shield (1) on the
printhead.
CAUTION!
If you turn the platen knob when the printer is not at Top of Form, the
TOF will misalign. Always feed the paper to TOF before turning the
platen knob!
NOTE
> Your software may print the first line of print above or below where
TOF is set. You may need to adjust the TOF to meet your software’s
requirements.
> The Top of Form and Forms Tear-Off settings of your printer interact.
How you set the Top of Form depends on whether Forms Tear-Off is
ON (set to 500 ms, 1 sec, or 2 sec) or OFF (the factory default
setting).
1

USING YOUR PRINTER > 15
FORMS TEAR-OFF
There are two ways to determine the status of the Forms Tear-Off
menu setting:
lPrint the Menu.
lUse the TEAR key.
To print the Menu:
1. Make sure paper is loaded.
2. Hold SHIFT (2), then press SEL (1) to enter the Menu Mode.
3. Press PARK (4) to print the menu.
4. Look for the Form Tear-Off setting in the paper feed group you
are using (Rear Feed, Bottom Feed or Top Feed—Forms Tear–
Off appears in the Top Feed group only if the optional Roll
Paper Stand is installed).
To use the TEAR key:
1. Make sure paper is loaded, and wait 2 seconds.
2. Press TEAR (3).
lIf the paper moves up, Forms Tear-Off is OFF.
lIf the paper moves down, Forms Tear-Off is ON.
1 2 34

USING YOUR PRINTER > 16
SETTING TOP OF FORM (TOF)
The first line prints at the red line (1) of the plastic paper shield on the
printhead.
Forms Tear-Off set to OFF - default
With paper loaded and the printer ON and selected:
1. Press PARK (6) to park the paper.
The SEL light goes off and the red alarm light comes on.
2. Press FF | LOAD (4) to load the paper.
3. If the printer is ON line, press SEL |MENU (1) to take the
printer OFF line.
The SEL light goes out.
4. Press and hold SHIFT (2), then:
lPress LF | Micro Feed Down (3) to set the TOF higher (the
paper moves down).
lPress FF/LOAD | Micro Feed Up (4) to set the TOF lower
(the paper moves up).
(When you begin pressing the Micro Feed key, the printhead will move
to the right).
5. Press SEL | MENU (1) to place the printer back on line.
To reset the Top of Form to the factory default, see “Resetting Top of
Form to the Factory Default” later in this chapter.
CAUTION!
If you turn the platen knob when the printer is not at Top of Form, the
TOF will misalign. Always feed the paper to TOF before turning the
platen knob!
1234675

USING YOUR PRINTER > 17
Forms Tear-Off set to ON
With paper loaded and the printer ON and selected:
1. Press PARK (6) to park the paper.
The SEL light goes off and the red alarm light comes on.
2. Press FF | LOAD (4) to load the paper.
3. Wait briefly until the paper moves up to the tear position, then
press and hold TEAR (5).
The paper moves to the current TOF and the SEL light is
illuminated.
4. If the printer is ON line, press SEL |MENU (1) to take the
printer OFF line.
The SEL light goes out.
5. Press and Hold SHIFT, then:
lPress LF | Micro Feed Down (3) to set the TOF higher (the
paper moves down).
lPress FF/LOAD | Micro Feed Up (4) to set the TOF lower
(the paper moves up).
(When you begin pressing the Micro Feed key, the printhead will move
to the right).
6. Press SEL | MENU (1) to save the setting and place the printer
back on line.
To reset the Top of Form to the factory default, see the next page.
1234675

USING YOUR PRINTER > 18
TEMPORARILY CHANGING THE TOP OF FORM
To move the Top of Form position lower for one page only:
1. Press SEL to deselect the printer.
2. Press LF to lower the position of the Top of Form.
RESETTING TOP OF FORM TO THE FACTORY DEFAULT
The factory default setting for the Top of Form (where the printing
should begin) is 1" down from the top of the page.
To reset the Top of Form to the factory default:
1. Remove paper from the paper path.
2. Turn the printer off.
3. Press and hold PARK + QUIET | TOF while turning on the
printer.
4. Reload paper.
FORMS TEAR-OFF FEATURE
This feature is normally turned off. To use Forms Tear-Off, you must
enter the menu and change the setting to the desired time interval
(see “Changing the Forms Tear-Off Settings”).
The Forms Tear-Off feature allows a printed continuous forms page to
be torn off without wasting paper or adjusting the printer. It can be
used for rear feed continuous forms, bottom feed continuous forms
(with the optional push tractor installed), or for top feed roll paper
(with optional roll paper stand installed).
When the printer is turned on, the paper feeds to the tear-off position.
CAUTION!
If you turn the platen knob when the printer is not at Top of Form, the
TOF will misalign. Always feed the paper to TOF before turning the
platen knob.

USING YOUR PRINTER > 19
When data is received, the paper automatically moves down to the
print position (TOF) and printing begins.
When printing stops, Forms Tear-Off automatically moves the paper to
align the perforation with the tear bar (located under the access
cover), after the time interval which you selected through the menu.
Paper remains in the tear-off position until the printer receives more
data. Then, the paper moves back down for printing.
POTENTIAL ISSUES WITH SOFTWARE PACKAGES
If Forms Tear-Off is set to
ON and the software package you are using
“ ”pauses for a long enough interval while sending data to the printer,
Forms Tear-Off may be activated. No data is lost, but this causes
uneven print registration due to the paper movement.
If this occurs, use the menu to turn off this feature, then use the TEAR
key to move the paper up to the tear position manually (see
“Changing the Forms Tear-off Settings”).
NOTE
You can also move the paper down to the print position manually by
pressing TEAR.
NOTE
> The status of the Forms Tear-Off menu setting affects how you set
the Top of Form: see “Top of Form (TOF) and Forms Tear-Off” earlier
in this chapter.
> Do not use Forms Tear-Off with labels or multipart forms!
> Forms Tear-Off cannot be used when the optional pull tractor is
engaged.

USING YOUR PRINTER > 20
CHANGING THE FORMS TEAR-OFF SETTING
The default setting for Forms Tear-Off is OFF.
To change the Forms Tear-Off setting:
1. Press SHIFT (2) + SEL (1).
2. Press GROUP (3) repeatedly until the Rear Feed or Bottom Feed
group shows in the first column of the printed line, depending
on which paper feed you are using,
3. Press ITEM (4) repeatedly until Form Tear-Off appears in the
second column:
Rear Feed Form Tear-Off Off
4. Press SET (5) until the time interval you wish to select appears
in the third column:
Rear Feed Form Tear-Off 1 Sec
5. Press SHIFT (2) + SEL (1) to exit Menu Mode and save the
setting.
MANUAL FORMS TEAR-OFF
If you don’t wish to engage the Forms Tear-Off feature, you can
advance:
lrear-feed continuous forms loaded on the built-in tractor
or
lbottom-feed continuous forms loaded on the optional push
tractor
up to the tear-off position manually, by pressing TEAR (5).
1234675

USING YOUR PRINTER > 21
PAPER PARK
Paper park allows you to switch to single sheet printing without
removing continuous feed paper from the printer.
When you wish to print single sheets, simply press PARK (6) to retract
the continuous form paper from the paper path, then lift the sheet
guide, load the sheet and send the print job.
CHANGING PAPER PATHS
CONTINUOUS FORMS TO SINGLE SHEETS
1. Tear off any printed pages, then press PARK.
2. Raise the sheet guide (1) to the single sheet feed position.
3. Pivot the wire feed guide into the sheet guide.
CAUTION!
Never park labels.
1

USING YOUR PRINTER > 22
4. Move the paper lever (1) to the middle position marked “TOP.”
5. Adjust the paper guides (1) for the size of paper you are using,
then place a sheet of paper in the sheet guide.
SINGLE SHEETS TO CONTINUOUS FORMS
1. Press FF/LOAD to remove the single sheet paper.
2. Lower the sheet guide into the continuous forms position.
1
1

USING YOUR PRINTER > 23
3. Swing the wire feed guide over onto the pull-up roller.
4. Move the paper lever to the appropriate position.
lRear feed:
lBottom feed:
lIf necessary, load continuous form paper.
5. Press FF/LOAD.

USING YOUR PRINTER > 24
PRINTHEAD GAP
1. The printhead gap is the distance between the printhead and
the platen.
To adjust the gap, open the access cover and move the coloured lever
(1) to the recommended setting from the table.
CAUTION!
Make sure the printer is turned OFF before you open the access cover.
Setting Media
1 Standard paper
2 2-part form (with carbon)
3 3-part form (with carbon)
4 4-part form (with carbon)
5 Envelopes or extra thick paper
NOTE
When the head gap is set to 2, 3, 4 or 5, the printer automatically slows
down for better print quality with multipart forms.
1

USING YOUR PRINTER > 25
PRINT QUALITY
Press PRINT QUALITY (1) to select:
Letter Quality (LQ light on):
lHighest quality, slowest speed
Choice of 7 typefaces
Utility (UTILITY light on):
lMedium quality, medium speed
Gothic typeface only
High Speed Draft (HSD):
lLower quality, higher speed
Gothic typeface only
To select the typeface you want, press PRINT QUALITY (1) until the
appropriate front panel lights are on.
NOTE
Front panel settings for print quality and character pitch are normally
overridden by software commands.
Type face Lights on
Courier LQ and COURIER
Gothic LQ and GOTHIC
Orator LQ and ORATOR
Prestige LQ and PRESTIGE
Roman LQ, COURIER and GOTHIC
Swiss LQ, PRESTIGE and GOTHIC
Swiss Bold LQ, COURIER and PRESTIGE
1

USING YOUR PRINTER > 26
CHARACTER PITCH
Character pitch determines how many characters will print on each
line. You can choose a specific fixed width (10 to 20) for each
character in characters per inch (CPI). The higher cpi settings are often
used for spreadsheets.
Proportional (PROP) sets character widths based on the character
itself: e.g., the letter i is assigned a narrower width than the letter m.
This provides a more polished, typeset appearance.
To select Proportional, press the CHARACTER PITCH key until both the
cpi value and PROP lights are illuminated.
To select non-proportional, press the CHARACTER PITCH key until the
light for the cpi value you wish to use is illuminated.
1

USING YOUR PRINTER > 27
PRINTER RESET
Clearing some error conditions requires that you reset (reinitialise)
the printer. To do this:
1. Press and release SEL (1) to take the printer off line.
The SEL light goes out.
2. Press and hold SHIFT (2), then press the RESET/CHARACTER
PITCH key (5).
EMULATIONS
lEpson® LQ —factory setting
lIBM®
Proprinter
lIBM®
AGM
Changing Emulations
Make sure paper is loaded.
1. Press and hold SHIFT (2), then press SEL (1).
2. Press LF (3).
The following line will print:
Printer Control Emulation Mode EPSON LQ
3. Press TEAR (4) repeatedly until the emulation you wish to
select prints in the right-hand column.
NOTE
Pressing SHIFT and RESET reinitialises the printer, but does not affect
any menu settings and does not reset the printer to the factory defaults.
For information on resetting the printer to the factory defaults, see
“ ”Resetting the Menu to the Factory Defaults later in this chapter.
14
32
5

USING YOUR PRINTER > 28
4. Press and hold SHIFT (2), then press SEL (1) to save your
setting and exit the Menu Mode.

MENU MODE > 29
MENU MODE
In Menu Mode, use the front panel keys to change the defaults for the
printer parameters. The changes made in the Menu Mode are
automatically saved when you exit the Menu Mode and are retained,
even when the printer is turned off.
MENU MODE KEYS
GROUP Key
Prints the next Group in the Menu.
With the SHIFT key, prints the previous Group.
ITEM Key
Prints the next Item in the Group.
With the SHIFT key, prints the previous Item in the Group.
SET Key
Prints the next setting for an Item.
With the SHIFT key, prints the previous setting for an Item.
PRINT Key
Prints a copy of all the Menu settings.
With the SHIFT key, prints the current settings for the Group
selected.
MENU Light
Illuminated when the printer is in Menu Mode.
NOTE
Please print the current Menu Mode settings before you reset or change
them. This is the only way to have a record of the settings.
14
32
5

MENU MODE > 30
ENTERING AND EXITING MENU MODE
Hold down the SHIFT key while pressing SEL.
RESETTING THE MENU TO THE FACTORY DEFAULTS
1. Turn the printer OFF.
2. Press SEL and LF while turning the printer ON.
PRINTING THE MENU SETTINGS
1. Make sure paper is loaded in the printer.
2. Press and hold SHIFT, then press SEL to enter the Menu Mode.
3. Press PRINT (PARK key).
PRINTING ALL MENU SETTINGS
To print out a listing of the settings for all menu items, regardless of
the emulation selected or the accessories installed:
Make sure paper is loaded in the printer.
1. Press and hold SHIFT, then press SEL to enter the Menu Mode.
2. Press and hold SHIFT, then press PRINT QUALITY.
CHANGING THE MENU SETTINGS
1. Press and hold SHIFT, then press SEL to enter the Menu Mode.
2. Use the GROUP, ITEM and SET keys to make your changes:
3. Press GROUP until the Group you wish to change appears in
the first column.
4. Press ITEM until the Item you wish to change appears in the
second column.
5. Press SET until the setting you want appears in the third
column.

MENU MODE > 31
6. Press and hold SHIFT, then press SEL to exit the Menu Mode
and save your settings.
MENU SETTINGS
For a complete explanation of each menu item, see “Explanations of
Menu Items” later in this chapter.
The table following shows the items which may appear in the menu.
Settings which are engaged at the factory (defaults) are set in bold
italic. Some groups or entries will only appear when a specific
emulation is engaged, as noted.
NOTE
If you turn off the printer without first exiting the Menu Mode, the
changes you have made will be lost.
Group Item Settings
Printer
Control
Emulation Mode EPSON LQ, IBM PPR, IBM AGM
Font Print Mode
Pitch
Proportional Spacing
Style
Size
LQ Courier, LQ Roman, LQ Swiss, LQ
Swiss Bold, LQ Orator, LQ Gothic,
LQ Prestige, Utility, HSD
10 cpi, 12 cpi, 15 cpi, 17.1 cpi, 20
cpi
NO, YES
Normal, Italics
Single, Double

MENU MODE > 32
Symbol Sets Character Set
Language Set
Zero Character
Code Page
Set I, Set II
ASCII, French, German, British,
Danish I, Swedish I, Italian,
Spanish I, Japanese, Norwegian,
Danish II, Spanish II, Latin American,
French Canadian, Dutch, Swedish II,
Swedish III, Swedish IV, Turkish,
Swiss 1, Swiss II, Publisher
Slashed, Unslashed
USA, Canada French, Multilingual,
Portugal, Norway, Turkey,
Greek_437, Greek_869, Greek_928,
Greek_437 CYPRUS, Polska Mazovia,
Serbo Croatic I, Serbo Croatic II,
ECMA-94, Hungarian CWI,
Windows Greek,
Windows East Europe,
Windows Cyrillic,
East Europe Latin II - 852,
Cyrillic I - 855, Cyrillic II - 866,
Kamenicky (MJK), ISO Latin 2,
Turkey_857,
Latin 5 (Windows Turkey), Ukrainian,
Bulgarian, ISO Latin 6 (8859/10),
Windows Baltic, Baltic_774,
KBL-Lithuanian, Cyrillic Latvian,
Roman-8, Icelandic-861,
Multilingual 858, ISO 8859-15
Greek_737, Asmo 449+, Asmo 708,
Arabic 864, Windows Arabic
Rear Feed Line Spacing
Form Tear-Off
Skip Over Perforation
Page Width (wide model)
Page Length
6 LPI, 8 LPI
Off, 500 ms, 1 sec., 2 sec.
No, Yes
13.6", 8"
11", 11-2/3", 12", 14", 17", 5", 3",
3.5", 4", 5.5", 6", 7", 8", 8.5"
Bottom Feed Line Spacing
Form Tear-Off
Skip Over Perforation
Page Width (wide model)
Page Length
6 LPI, 8 LPI
Off, 500 ms, 1 sec., 2 sec.
No, Yes
8", 13.6"
11", 11-2/3", 12", 14", 17", 5", 3",
3.25", 3.5", 4", 5.5", 6", 7", 8", 8.5
Group Item Settings

MENU MODE > 33
Top Feed Line Spacing
Form Tear-Off*
Bottom Margin
Page Width (wide model)
Page Length
Wait Time
Page Length Control
* With RollPaper Stand fitted
6 LPI, 8 LPI
Off, 500 ms, 1 sec., 2 sec.
Valid, Invalid
8", 13.6"
11", 11-2/3", 12", 14", 17", 5", 3",
3.25", 3.5", 4", 5.5", 6", 7", 8", 8.5"
OFF,500 ms, 1 sec., 2 sec.
by Actual Page Length, by MENU
Setting
Set-Up Graphics
Receive Buffer Size
Paper Out Override
Print Registration 1
Print Registration 2
Operator Panel Function
Reset Inhibit
Print Suppress Effective
Auto LF
Auto CR*
CSF Bin Select**
SI Select Pitch (10 cpi)*
SI Select Pitch (12 cpi)*
Time Out Print
Auto Select
Centring Position
CSF Type**
Power Saving
Power Save Time
* When IBM emulation is selected.
** When Cut Sheet Feeder is fitted
Bi-directional, Uni-directional
1 Line, 32K, 64K, 128K
No, Yes
0, range to 0.25 mm to the right or
left, set in 0.05 mm increments
Press SEL to shift registration to the
left; press SHIFT + SEL to shift
registration to the right.
0, range to 0.25 mm to the right or
left, set in 0.05 mm increments press
SEL to shift registration to the left;
press SHIFT + SEL to shift
registration to the right.
Full Operation, Limited Operation
No, Yes
No, Yes
No, Yes
No, Yes
Bin 1, Bin 2
15 cpi, 17.1 cpi
12 cpi, 20 cpi
Valid, Invalid
No, Yes
DEFAULT, MODE 1, MODE 2
Wide, Narrow
Enable, Disable
5 min., 10 min., 15 min., 30 min., 60
min.
Group Item Settings

MENU MODE > 34
Parallel I/F I-Prime
Pin 18
Auto Feed XT*
Bi-Direction
*When Epson LQ emulation selected.
Buffer Print, Buffer Clear, Invalid
+5V, Open
Invalid, Valid
Enable, Disable
Serial I/F* Parity
Serial Data 7/8 bits
Protocol
Diagnostic Test
Busy Line
Baud Rate
DSR Signal
DTR Signal
Busy Time
* When Serial I/F installed.
None, Odd, Even
8 Bits, 7 Bits
Ready/Busy, X/ON / X/OFF
No, Yes
SSD-, SSD+, DTR, RTS
19200 bps, 9600 bps, 4800 bps,
2400, 1200, 600, 300 bps
Valid, Invalid
Ready On Power Up, Ready On Select
200 ms, 1 sec.
CSF Bin 1** Line Spacing
Bottom Margin
Page Width (Wide model)
Page Length
6 LPI, 8 LPI
Valid, Invalid
8", 13.6"
11", 11-2/3", 12", 14", 17", 5", 3.5",
4", 5.5", 6", 7", 8", 8.5"
CSF Bin 2** Line Spacing
Bottom MarginV
Page Length
* * When Cut Sheet Feeder installed.
6 LPI, 8 LPI
Valid, Invalid
11", 11-2/3", 12", 14", 17", 5", 3.5",
4", 5.5", 6", 7", 8", 8.5"
Group Item Settings

MENU MODE > 35
EXPLANATION OF MENU ITEMS
These explanations are in alphabetical sequence to make it easier to
look them up. Some items only appear when optional accessories are
installed; others appear in several groups in the menu.
Auto CR, Default =No
IBM emulation only. If you want the printer to automatically add a
carriage return when a Line Feed is received at the end of a line,
change the setting to Yes.
Auto LF, Default = No
If your printout is consistently double spaced, select No; if it
overprints, select Yes.
Auto Feed XT, Default = Invalid
Epson emulation only. In the Epson emulation, the XT signal on pin 14
of the parallel interface can control automatic line feed. Some
interface cables are wired in such a way that automatic line feed is
always in effect: this item eliminates this potential problem. If your
system uses pin 14 of the parallel interface to control automatic line
feed, change the setting to Valid.
Auto Select, Default = No
Determines whether or not your printer will automatically be selected
after you load in paper. With the factory default engaged, the printer
will be deselected so that you can set the Top of Form. If you always
use the same Top of Form position, change the setting to Yes.
Baud Rate, Default = 9600 bps
Appears only if optional Serial Interface is installed. Set this to match
your system’s transmission speed.
Bi-direction, Default = Enable
Change this setting if you wish to disable bi-directional transmission
(PnP) in Nibble mode.

MENU MODE > 36
Bottom Margin, Default = Valid
Change to Invalid if you want the printer to ignore the bottom margin
setting.
Busy Line, Default = SSD-
Appears only when the optional Serial Interface is installed. If Ready/
Busy protocol (factory default) is selected, you can choose which line
your system monitors for a busy signal:
lSSD -9V, select SSD-
lSSD +9V, select SSD+
lDTR -9V, select DTR
lRTS -9V, select RTS
Busy Time, Default = 200 ms
Appears only when the optional Serial Interface is installed. Sets the
length of the busy signal when the Ready/Busy protocol (factory
default) is engaged.
Busy Time Default = 200ms
Appears only when the optional Serial Interface is installed. Sets the
length of the Busy signal when the Ready/Busy protocol (factory
default) is enabled.
Centering Position, Default = DEFAULT
Used to limit printhead travel when printing narrow columns.
lSelect Mode 1 for the narrow carriage printer.
lSelect Mode 1 or Mode 2 for the wide carriage printer.
CAUTION!
Setting the Bottom Margin to Invalid can cause loss of data and
damage the printhead by allowing printing without paper.

MENU MODE > 37
Character Set, Default = IBM Set II
Use this to switch character sets to IBM Set I.
Code Page, Default = USA
Choose the Code Page character set you wish to use:
USA, Canada French, Multilingual 850, Portugal 860, Norway 865,
Turkey, Greek_437, Greek_869, Greek_928, Greek_437 CYPRUS,
Polska Mazovia, Serbo Croatic I, Serbo Croatic II, ECMA-94,
Hungarian CWI, Windows Greek, Windows East Europe,
Windows Cyrillic, East Europe Latin II - 852, Cyrillic I - 855,
Cyrillic II - 866, Kamenicky (MJK), ISO Latin 2, Turkey_857,
Latin 5 (Windows Turkey), Ukrainian, Bulgarian,
ISO Latin 6 (8859/10), Windows Baltic, Baltic_774, KBL-Lithuanian,
Cyrillic Latvian, Roman-8, Icelandic-861, Multilingual 858,
ISO 8859-15, Greek_737, Asmo 449+, Asmo 708, Arabic 864,
Windows Arabic.
CSF Bin Select, Default = Bin 1
Appears only when the optional Dual-Bin Cut Sheet Feeder is
installed. Use this to switch to Bin 2 as the default.
CSF Type, Default = Wide
To avoid paper jams, change this setting to Narrow if you are using the
optional Cut Sheet Feeder on the wide model ML421 printer.
Diagnostic Test, Default = No
Appears only when the optional Serial Interface is installed. Select
YES to perform a diagnostic test of the serial interface.
DSR Signal, Default = Valid
Appears only when the optional Serial Interface is installed. Used with
the Ready/Busy protocol (factory default) to select the way your
system handles the DSR signal.

MENU MODE > 38
DTR Signal, Default = Ready On Power Up
Appears only when the optional Serial Interface is installed. Change
to Ready On Select if the DTR signal is required when the printer is
selected (leave as Ready On Power Up if the DTR signal is required
when the printer is turned ON).
Emulation Mode, Default = Epson LQ
Selects the printer command set (emulation) you want to enable.
Form Tear-Off, Default = Off
Choose 500 ms, 1 sec., or 2 sec. to turn the Form Tear-Off feature ON
and to set the time interval for the printer to wait before advancing the
paper.
Graphics, Default = Uni-directional
Change to uni-directional graphics for better registration, but slower
printing. With this set for bi-directional, you can optimise the
registration using the Print Registration setting in the Menu.
Graphics Speed, Default = Low
Change to HIGH for faster printing when the optimum print quality is
not an issue.
I-Prime, Default = Buffer Print
Determines what the printer will do when it receives the I-Prime signal
from the software.
lBuffer Print: prints out the buffer contents before resetting.
lBuffer Clear: dumps the buffer contents immediately.
lInvalid: causes the printer to ignore the I-Prime command.
Select this setting if you wish to enter settings through the
printer’s control panel which will not be automatically
overridden by the software’s settings when the I-Prime signal
is sent.

MENU MODE > 39
Language Set, Default = ASCII
Replaces certain standard symbols with special characters used in
foreign languages.
Line Spacing, Default = 6 lpi
Change to 8 lines per inch (lpi) to get more lines on a page.
Operator Panel Function, Default = Full Operation
Change to Limited Operation to deactivate the PRINT QUALITY and
CHARACTER PITCH buttons, so that these features can only be
controlled through your software. This prevents these from being
changed from the control panel when several people are using the
printer.
Page Length, Default = 12"
Selects the length of the paper you are using. This enables the printer
to keep track of the initial printing position (TOF) on each page.
Page Length Control, Default = by Menu Setting
If you wish to use the Paper End sensor to detect the actual paper end,
use Actual Page Length setting. If you use “by Menu Setting”, the
printer will disregard the Paper End (PE) and use the page length as
set by the menu.
Page Width, Default = 13.6"
Wide carriage model only. Change to 8" to print on narrow paper.
NOTE
This feature also prevents access to the Menu. To access the Menu in
these circumstances, turn the printer OFF, then hold down the SEL key
while turning ON the printer.

MENU MODE > 40
Paper Out Override, Default = No
Senses when less than 1" (25 mm) of paper remains and stops
printing. Change to Yes to override the sensor and print closer to the
bottom of the page.
Parity, Default = None
Appears only when the optional Serial Interface is installed. Selects
the type of parity your system uses: None, Odd or Even.
Pin 18, Default = +5V
Sets the signal on pin 18 to +5 volts or open.
Pitch, Default = 10 cpi
Choose the character width in characters per inch (cpi).
Power Save Time, Default = 5 min.
Sets the interval the printer waits for more data before it goes into the
power save mode. Power Saving must be set to Enable (the factory
default) for this to be effective.
Power Saving, Default = Enable
Change to Disable if you wish to prevent the printer from entering the
Power Save mode after the selected interval.
Print Mode, Default = LQ Courier
Choose the quality and typeface of printing.
Print Registration, Default = 0
Change the setting as required to obtain the best registration for bi-
directional printing.
CAUTION!
Engaging Paper Out Override can cause loss of data and damage the
printhead by allowing printing without paper.

MENU MODE > 41
Print Suppress Effective, Default = Yes
If your system uses the DC1 and DC3 codes for something other than
the print suppress mode, change the setting to No.
Proportional Spacing, Default = No
Change the setting to Yes to engage proportional spacing of
characters.
Protocol, Default = Ready/Busy
Appears only if the optional Serial Interface is installed. Change to
X-ON / X-OFF if that is the type of protocol your system uses.
Receive Buffer Size, Default = 64K
Selects the amount of memory devoted to holding received data.
Choosing 1 Line will tie up your computer while printing, but if you
abort the print job, the printer will stop much sooner.
Reset Inhibit, Default = No
Select Yes if you wish the printer to ignore the reset command sent by
software. This prevents your software from changing the settings you
make through the front panel controls or through printer commands.
Serial Data 7/8 Bits, Default = 8 Bits
Appears only if the optional Serial Interface is installed. Change to 7
Bits if your system uses a 7-bit data format.
SI Select Pitch 10 cpi, Default = 17.1 cpi
IBM emulation only. Sets the pitch to be engaged when the printer
control panel is set for 10 cpi and the SI command is received.
NOTE
This will also prevent your software from clearing out existing settings
when you finish printing one document and switch to another.

MENU MODE > 42
SI Select Pitch 12 cpi, Default = 20 cpi
IBM emulation only. Sets the pitch to be engaged when the printer
control panel is set for 12 cpi and the SI command is received.
Size, Default = Single
Change to Double for double width and height printing.
Skip Over Perforation, Default = No
Change to Yes if you want the printer to go to the next page when it
comes within 1" (25 mm) of the bottom of the page. Keep it set to No
if your software has its own page formatting controls.
Style, Default = Normal
Change to Italics if you want the printed characters to be slanted.
Time Out Print, Default = Valid
If your software spends a long time processing between portions of
data it feeds to the printer, change the setting to Invalid to keep your
printer from dumping the received data while it is waiting for more.
Wait Time, Default = 1 sec.
Sets the amount of time the printer will wait for more data before
moving to the form tear-off position.
Zero Character, Default = Unslashed
If you want the printer to use a slash to distinguish the number zero
from the capital letter O, change the setting to Slashed.

MAINTENANCE > 43
MAINTENANCE
REPLACING THE RIBBON CARTRIDGE
Important!
Make sure you have the correct replacement ribbon for your printer.
The wrong ribbon will not print when installed in your printer. Look for
the printer model number on the ribbon package.
RIBBON CARTRIDGE HANDLING
lLeave unused ribbon cartridges in their packages until
needed.
lCareful; the ribbon ink may cause permanent stains.
lRibbon ink on skin or clothing can usually be removed with
soap and water.
Make sure the printer is turned OFF.
1. Open the access cover and center the printhead.

MAINTENANCE > 44
2. Swing the used ribbon cartridge up off the printhead, lift it
out, and discard it.
3. Unpack the new ribbon cartridge and install it.
Important!
Do not remove the ribbon shield (1) from the ribbon!
4. Turn the take-up knob (1) in the direction of the arrow to take
up any ribbon slack.
5. Close the access cover and turn the printer back on.
If ribbon should contact the eyes:
Flush eyes with large quantities of water for 15 minutes, keeping
eyelids open with fingers. Seek medical attention.
If ribbon should contact the skin
Wash thoroughly with soap and water.
WARNING!
The printhead may be HOT.
1
1

MAINTENANCE > 45
LOADING PAPER
REAR FEED
If you have any paper in the paper path, remove it before installing
rear feed paper.
1. Lock Lever
2. Upper Tractor Cover
3. Pins
Loading Rear Feed Paper from the Back of the Printer
These instructions assume you have ready access to the back of the
printer. If you do not, go to “Loading Rear Feed Paper from the Front of
the Printer.”
Make sure the paper lever is forward (position marked “ ”REAR ).
1
2
3

MAINTENANCE > 46
1. Open the access cover (1).
2. Grasp the sheet guide. Lift it slightly, then slide it back.
3. Pivot the sheet guide forward and gently rest it against the
roller assembly.
Careful!
If you push the sheet guide too hard against the roller assembly, it
may dislodge it. If it does, be sure to reseat the roller assembly before
continuing.
1
1
2
3

MAINTENANCE > 47
4. From the back of the printer, locate the tractors (1).
5. Open the lock levers (1) and move the right tractor (as viewed
from the back of the printer) to the reference mark (2)
matching the width of the paper you are loading. Then close
the lock lever on the right tractor:
6. Open the tractor covers.
NOTE
The movement of the right tractor is limited to ensure that the paper
covers the paper sensor.
1
1
15590
2
15
16
10 9.5
5591

MAINTENANCE > 48
7. Place continuous forms paper on the first two pins of either
tractor.
Important!
You must keep the number of paper holes engaged on either pin the
same. If you don’t the paper will skew and jam.
8. Close the right tractor cover.

MAINTENANCE > 49
9. Adjust the left tractor until the holes in the paper are centered
on the pins then lock the lever and close the left tractor cover.
10. Lower the sheet guide and slide it towards the front of the
printer until the marks align.
NOTE
If the paper is too loose, or too tight, it can cause jams.

MAINTENANCE > 50
11. Place the wire guide in the sheet guide on the pull-up roller
assembly.
12. Press FF/LOAD.
Loading Rear Feed Paper from the Front of the Printer
These instructions assume you do not have ready access to the back of
the printer. If you do, go back to “Loading Rear Feed Paper from the
Rear of the Printer” earlier in this chapter.
1. Lock Lever
2. Upper Tractor Cover
3. Pins
NOTE
The factory default setting for the Top of Form (where the printing should
begin) is 1" down from the top of the page. To change the setting, see
“ ”Top of Form (TOF) in the previous chapter.
1
2
3

MAINTENANCE > 51
Make sure the paper lever is forward (position marked “ ”REAR ).
1. Open the access cover (1).
2. Grasp the tabs and lift off the sheet guide.
1

MAINTENANCE > 52
3. Pull up on the lock levers to release them.
4. Move the left tractor to the position to match your paper size
and push back on the lever to lock it in place, then move the
right tractor to fit the width of the paper. You will find
reference marks (1 in illustration below) on the printer for the
two most common paper sizes:
NOTE
The movement of the left tractor (as viewed from the front of the printer)
is restricted to ensure that the paper covers the paper out sensor.
15590 5591
10 9.5 16 15

MAINTENANCE > 53
5. Open the tractor covers and place continuous forms paper on
the first two pins of either tractor, then close the left tractor
cover.
6. Adjust the position of the right tractor to center the holes in
the paper on the pins. Then, close the right tractor cover and
push back the lock lever. Do not stretch the paper.
If the paper is too loose or too tight it can cause jams.
NOTE
You must keep the number of paper holes engaged on either pin the
same. If you don’t the paper will skew and jam.

MAINTENANCE > 54
7. Reinstall the sheet feeder.

MAINTENANCE > 55
8. Place the wire guide (1) in the sheet guide on the pull-up roller
assembly.
9. Press FF/LOAD.
NOTE
The factory default setting for the Top of Form (where the printing should
begin) is 1" down from the top of the page. To change the setting, see
“ ”Top of Form (TOF) in the previous chapter.

MAINTENANCE > 56
TOP FEED (SINGLE SHEETS)
If you have continuous form paper in the path, press PARK to remove
it before loading single sheets.
Make sure the printer is on and deselected (SEL light off).
1. Move the paper lever (1) to the center position (marked
“ ”TOP ).
2. Open the acoustic cover (1) and raise the sheet guide (2) to the
single sheet position. Pivot the wire feed guide (3) up into the
sheet guide.
1
1
2
3

MAINTENANCE > 57
3. Adjust the paper feed guides (1) for the width of the paper,
then place a sheet of paper in the separator. The paper will
feed into the printer.
NOTES
> If the paper does not feed in, remove it. Check the paper lever
position. Make sure the ALARM light is ON: if it is flashing, hold the
SHIFT key and press the CHARACTER PITCH/RESET key. Reload the
sheet of paper.
> The factory default setting for the Top of Form (where the printing
should begin) is 1" down from the top of the page. To change the
setting, see “Top of Form (TOF)” in the previous chapter.
1

MAINTENANCE > 58
CLEARING PAPER JAMS
REAR FEED JAMS
1. Turn off the printer.
2. Use the platen knob to back the paper all the way out of the
printer.
3. Open the access cover (1) and remove the pull-up roller
assembly (2). Remove any torn paper.
4. Lift the sheet guide (1) and reload paper. Make sure you lock
the tractor covers.
CAUTION!
Make sure the printer is turned OFF before you open the access cover.
1
2

MAINTENANCE > 59
5. Lower the sheet guide, then install the pull-up roller assembly
and close the access cover.
6. Turn ON the printer and press FF/LOAD.
REAR FEED, REPEATING PAPER JAMS
If the paper keeps jamming, you may have:
ldefective paper
lmisaligned paper
lbits of paper stuck in the paper path
Defective Paper
Replace the defective paper with a fresh stack.
Misaligned Paper
1. Turn off the printer.
2. Use the platen knob to back the paper all the way out of the
printer.
3. Tear off a couple of sheets of paper, leaving a new, clean,
square-cut edge.
4. Reload the paper and turn the printer back on.
Fragments of Paper in the Paper Path
1. Turn off the printer.

MAINTENANCE > 60
2. Use the platen knob to back the paper all the way out of the
printer.
3. Open the access cover (1) and remove the pull-up roller
assembly (2). Then grasp the tabs (3) on the sheet guide (4)
and lift it off the printer.
4. Remove any torn pieces of paper.
5. Fold some continuous form paper over three times to make a
page four sheets thick. Then, load it on the tractors and close
and lock the covers.
CAUTION!
Make sure the printer is turned OFF before you open the access cover.
1
2
3
4
3

MAINTENANCE > 61
6. Use the platen knob to draw the quadruple-thick page around
the platen. This brings out jammed pieces of paper.
7. Remove the paper pieces. Then, use the platen knob to back
the paper out.
8. Load standard paper, close and lock the tractor covers.
9. Install the sheet guide, then install the pull-up roller assembly
and close the access cover.
10. Turn the printer on and press FF/LOAD.

MAINTENANCE > 62
SINGLE SHEET PAPER JAMS
1. Turn off the printer.
2. Use the platen knob to back the paper out.
3. Open the access cover (1) and remove the pull-up roller
assembly (2).
4. Remove any torn pieces from around the carriage.
5. Reinstall the pull-up roller assembly and close the access
cover.
1
2

MAINTENANCE > 63
CLEANING THE HOUSING
You should clean the printer housing every six months (or after about
300 hours of operation).
1. Turn off the printer.
2. Use the platen knob to back the paper out of the printer.
3. Open the access cover (1) and remove the pull-up roller
assembly (2).
4. Use a clean, dry cloth to dust around the carriage shaft and
platen. Remove any loose bits of paper.
CAUTION!
Never use strong solvents or strong detergents on the cabinet—they
could damage the housing.
CAUTION!
Make sure the printer is turned off before you open the access cover.
1
2

MAINTENANCE > 64
5. Reinstall the pull-up roller assembly and close the access
cover.

TROUBLESHOOTING > 65
TROUBLESHOOTING
GENERAL INFORMATION
Here are some general things to check before proceeding with
detailed troubleshooting.
lIs the printer plugged in and turned ON?
lAre the connections (power and interface) secure?
lIs the product being operated under the proper ambient
conditions?
lDoes the paper being used meet the specifications for this
product?
lIs the paper properly installed?
lIs the ribbon properly installed?
lIs an Oki ribbon being used?
lIs the printhead gap correctly set?
lAre the correct printer drivers being used for the printer?
Problem
My word processor files do not print the way I have the menu and front
panel set.
Solution
Remember:
lSettings in your software application can override settings in
your printer driver.
NOTE
> Settings in your software application will normally override any
settings in your printer driver.
> Printer driver settings normally override settings from the printer
menu or printer front panel.

TROUBLESHOOTING > 66
lYour printer driver settings can override any settings from the
printer menu or printer front panel.
Before sending a file to the printer, many word processors send either
an “initialisation string” or an I-Prime signal to the printer.
The initialisation string contains codes that override the panel and
menu settings. To change your printer to ignore the reset code, enter
the Menu Mode, go to the Set-Up group and change the setting for
Reset Inhibit to YES.
The I-Prime signal will automatically override any front panel settings
you have made. To eliminate this problem, enter the Menu Mode, go
to the Parallel Interface group and change the setting for I-Prime to
Invalid.
For more information on changing menu settings, see “Changing the
Menu Settings” in chapter 3.
Problem
Nothing happens when I turn ON the printer.
Solution
Check the power cord connection to the outlet and to the printer. If
you are using a power strip, make sure it is turned ON, and that the
fuse hasn’t blown or that the circuit breaker hasn’t tripped.
Problem
The printer does not print when the computer sends data.
Solutions
1. Is the SEL light on? If not, press the SEL key.
2. Check that the interface cable is securely connected to both
the printer and the computer.
3. If you have the optional serial interface board installed, check
to be sure that it is firmly seated in the printer.

TROUBLESHOOTING > 67
Problem
I'm getting strange symbols, incorrect fonts, etc., when I try to print a
document.
Solutions
1. Check to be sure that the printer driver you have selected in
your software matches the printer emulation.
2. Press SHIFT and SEL keys, then press GROUP key.
This will print a line showing the emulation you have selected.
3. If you have embedded any printer commands in your software,
check to be sure that you entered them correctly.
Problem
Ink smears on the paper when I print narrow columns.
Solution
This may be caused by excessive printhead travel from the centering
position. Enter the Menu and set the Centering Position to MODE 1.
See “Using Your Printer, Menu Mode.”
For the wide-carriage printer, if MODE 1 doesn't work, try setting the
Centering Position to MODE 2.
Problem
I've installed a new ribbon and the printing is smeared and streaked.
Solution
The ribbon shield (1) is either loose or missing.
Remove the ribbon cartridge and check the ribbon shield.
lIf it is loose, secure it.
lIf it is missing, find it and install it.
1

TROUBLESHOOTING > 68
Problem
There are dots missing in my printouts.
Solution
The head gap may not be set correctly. Try moving the headgap lever
to a lower setting. If that doesn’t help, the printhead may be
damaged; call for service.
Problem
The ALARM light is flashing.
Solution
Try turning the printer OFF and then back ON again. If the light still
blinks, call for service.
Problem
The ALARM light is ON and the Character Pitch 10 light is flashing.
Solution
This indicates that the paper lever is set at the wrong position for the
paper you are trying to use. Move it to the proper setting.
Problem
The ALARM light is ON and the Character Pitch 15 light is flashing.
Solution
This indicates a paper jam. Press the SEL key and correct the paper
jam situation. See “Clearing Paper Jams,” in chapter 3.
Problem
The printer needs paper. The ALARM is not ON and I can’t load paper.
Solution
1. Press and release the SEL key.
2. Press and hold the SHIFT key and press the RESET /
CHARACTER PITCH key.
The ALARM light illuminates and you can now load paper.

TROUBLESHOOTING > 69
Problem
Continuous form paper sticks to the sheet guide.
Solution
In cold dry weather, static charges can build up and make the paper
cling to the sheet guide. Try moving the paper guides together so that
the paper rests on the guides rather than on the separator.
Problem
The Print Quality and Character Pitch keys on the front panel don't
work.
Solution
The Operator Panel Function in the printer menu can be used to
disable these buttons (Limited Function). If the printer is part of a
customized system or if it is used by a number of people, the system
manager may have used this option to make sure the printer is always
set properly.
Check with your system manager before changing any menu settings.

PARTS AND ACCESSORIES > 70
PARTS AND ACCESSORIES
Purchasing Parts & Accessories
Before you purchase parts and accessories, make a note of your
printer model number (see the front of the unit) and have the correct
part number and description of the item you wish to purchase. Item
descriptions and part numbers are provided in this section.
lConsult the dealer where you purchased your printer.
lLocate an Authorised Oki Reseller by visiting your local Oki
web site. Links to all countries are provided on:
http://www.okieurope.com
Item Part number
ML5590
Part number
ML5591
Ribbon Cartridge (1) 01126301 01126301
Platen Knob (2) 2PP4025-2871P021 2PP4025-2871P021
Power Cord (3) - Euro
K U
YS4011-1272P001
YS4011-1273P001
Printhead (4) 42124201 42124201
Access Cover (5) 42115401 42115301
Sheet Guide (6) 1PA4094-7305G010 1PA4094-7308G011
Pull-up Roller Assembly (7) 42044701 42045701
2
4
6
3
x 2

PARTS AND ACCESSORIES > 71
Option Part number
ML5590
Part number
ML5591
Pull Tractor, Top-Mount (1) 09002365 09002369
Push Tractor, Bottom-Mount (2) 09002366 09002370
Roll Paper Stand (3) 09002332 N/A
Cut Sheet Feeder (4)
Single Bin
Dual Bin
09000691
09000692
09000695
09000696
Serial Interface RS232C (5) 09002351 09002351
1
2
3
4
5

PRINTER CONTROL CODES > 72
PRINTER CONTROL CODES
This section lists the most commonly used printer control codes.
You will find a comprehensive listing of the control codes (English
only) on your Printer CD.
To access it:
1. Place the CD in your CD-ROM drive and wait for it to AutoPlay.
2. Select your printer model, then click Continue.
3. Click Documentation and follow the on-screen prompts to view
the file.
EPSON LQ COMMANDS
Epson Command ASCII Decimal
Backspace BS 8
Cancel CAN 24
Carriage Return Execute CR 13
Character Pitch:
Select 10 cpi
Select 12 cpi
Select 15 cpi
Begin 10 cpi
DC2
ESC:
ESC G
ESC SI, or SI
18
27 58
27 103
27 15, OR 15
Cancel Condensed Print DC2 18
Character Style:
Normal
Outline
Shadow
Outline with Shadow
ESC q 0
ESC q 1
ESC q 2
ESC q 3
27 113 48
27 113 49
27 113 50
27 113 51
Delete DEL 127
Double Height ON
Double Height OFF
ESC w 1 or ESC US 0
ESC w 0 or ESC US 1
27 119 49 or 27 31 48
27 119 48 or 27 31 49
Double Width ON
Double Width OFF
Double Width for one line
ESC W 1
ESC W 0
SO or ESC SO
27 87 49
27 87 48
14 or 27 14
Emphasised Printing ON
Emphasised Printing OFF
ESC E
ESC F
27 69
27 70
Enhanced Printing ON
Enhanced Printing OFF
ESC G
ESC H
27 71
27 72
Form Feed FF 12

PRINTER CONTROL CODES > 73
Form Length:
n inches (n = 1 to 22)
n lines (n = 1 to 127)
ESC C NUL n
ESC C n
27 67 0 n
27 67 n
Horizontal Tab, Execute HT 9
Italics ON
Italics OFF
ESC 4
ESC 5
27 52
27 53
Initialise Printer ESC @ 27 64
Justification
Left
Center
Right
Full
ESC a 0
ESC a 1
ESC a 2
ESC a 3
27 97 48
27 97 49
27 97 50
27 97 51
Line Feed, Execute:
w/ Carriage Return
n/180" (n = 0 to 255)
n/360" (n = 1 to 255)
Reverse (n = 0 to255)
LF
ESC J n
ESC ] n
ESC j n
10
27 74 n
27 93
27 106 n
Line Spacing set to:
n/360" (n= 0 to 255)
n/180" (n = 0 to 255)
n/60" (n = 0 to 127)
n1/6"
1/8"
ESC + n or ESC [ n
ESC 3 n
ESC A n
ESC 2
ESC 0
27 43 or 27 91 n
27 51
27 65
27 50 n
27 48
Paper Out Sensor OFF
Paper Out Sensor ON
ESC 8
ESC 9
27 56
27 57
Print Quality/Font, select:
LQ
Utility
Roman (LQ only)
Swiss (LQ only)
Courier (LQ only)
Prestige (LQ only)
Orator (LQ only)
ESC x 1
ESC x 0
ESC k 0
ESC k 1
ESC k 2
ESC k 3
ESC k 7
27 120 49
27 120 48
27 107 48
27 107 49
27 107 50
27 107 51
27 107 55
Print Speed
Half speed ON
Half speed OFF
ESC s 1
ESC s 0
27 115 49
27 115 48
Print Suppress Mode ON
Print Suppress Mode OFF
DC3
DC1
19
17
Proportional Spacing ON
Proportional Spacing OFF
ESC P 1
ESC P 0
27 80 49
27 80 48
Skip over perforation ON (n = 1 to 127)
Skip over perforation OFF
ESC N n
ESC O
27 78 n
27 79
Software I-Prime ESC } NUL 27 125 0
Epson Command ASCII Decimal

PRINTER CONTROL CODES > 74
Subscript ON
Superscript ON
Subscript/Superscript OFF
ESC S 1
ESC S 0
ESC T
27 83 49
27 83 48
27 84
Underline Printing ON
Underline Printing OFF
ESC - 1
ESC - 0
27 45 49
27 45 48
Uni-directional Print
ON
OFF
One line only
ESC U 1
ESC U 0
ESC <
27 85 49
27 85 48
27 60
Upper Range Control Codes
Permit Printing
Cancel Printing
ESC 6
ESC 7
27 54
27 55
Vertical Tab, Execute VT 11
Epson Command ASCII Decimal
Produkt Specifikationer
Mærke: | OKI |
Kategori: | Printer |
Model: | ML5591 |
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