Every effort has been made to ensure that the information in this document is complete,
accurate and up-to-date. Mention of software packages manufactured by other
companies does not necessarily constitute endorsement by Oki. We do not assume
responsibility for errors beyond our control, nor can Oki guarantee that changes in the
software and equipment made by other manufacturers and referred to in this book will
not affect the applicability of information in this book.
Oki is a registered trademark of Oki Electric Industry Co. Ltd.
Microline is a registered trademark of Oki Electric Industry Co. Ltd.
Epson is a registered trademark of Seiko Epson Corp.
IBM, IBM PC, PC XT and PC AT are registered trademarks of International Business
Machines Corp.
®
SWISS
is a trademark of Bitstream, Inc.
i
Introduction
Oki ML590/91 Elite printers are now equipped with the latest Epson printer control
language called ESC/P2. While supporting ESC/P commands as its subset, ESC/P2
also provides:
–Fonts which can be defined by point size and pitch in one command.
–Font scaling between 8 and 64 points (Courier, Roman and Swiss typefaces).
–Enhanced raster graphics mode.
Your Microline 590/591 Elite incorporates INTELLIGENT HEAD TECHNOLOGY,
Oki’s proprietary method for improving paper handling and print quality. It
automatically senses the thickness of the loaded paper and adjusts the head gap prior
to printing. Therefore with awkward media like envelopes, multi part forms etc., it can
compensate for changes in the thickness of paper. Auto head gap technology means
superior print quality, especially on multi-part forms. It is simple to use as no manual
adjustment is necessary when changing paper types.
Other features of the ML590/591 Elite include:
–Zero tear for better forms management.
–Elimination of the bail arm, for a clearer and more versatile paper path.
–Seven resident fonts (including draft).
–Optional colour ribbon kit.
–Optional bottom push tractor unit, with stand and metal tear bar.
–Optional roll paper stand (ML590 Elite only).
–Single and dual bin cut sheet feeder assemblies.
–Eight resident bar code fonts.
–Fast Letter Quality printing at 120 cps and Draft at 360 cps (at 12 CPI).
ii
Contents
Selecting Drivers ....................................................................................... vi
Serial Interfacing (RS-232C) ................................................................. C–5
Serial Interfacing (RS-422A)................................................................. C–7
Menu Selections for Serial Interfacing .................................................. C–10
Local Tests ............................................................................................. C–11
Communication Procedures ................................................................... C–12
v
Selecting Drivers
Printer drivers are usually written for a particular model of printer and identified by the
name of that printer. Although most packages offer several selections, they cannot
have drivers for every printer. Therefore, you may have to choose a driver that was not
specifically written for the ML590/591 Elite but is compatible or nearly so. Installing
a driver is normally a simple process of making a selection from a menu. Look for one
of the following printers on your software’s printer driver selection. As you go further
down each list, you will have access to fewer ML590/591 Elite features.
The ML590/591 Elite is the successor to the ML390/391 but with added features. It is
therefore possible to use the ML390/391 printer driver in place of the ML590/591 Elite
driver.
IBMEPSON
EMULATIONEMULATION
Oki ML590/591Oki ML590/591
ML390/391ML390/391
IBM PPR (XL24E)Epson (LQ-850, LQ-1050, LQ-870 and
LQ-1170)
IBM AGM
vi
IMPORTANT
The wires in this mains lead are coloured in accordance with the following code:
GREEN AND YELLOWEARTH
BLUENEUTRAL
BROWNLIVE
As the colours of the wires in the mains lead of this apparatus may not correspond with
the coloured markings identifying the terminals in your plug—PROCEED AS
FOLLOWS:
The wire coloured GREEN AND YELLOW must be connected to the terminal in the
plug marked with the letter E or by the safety earth symbol or coloured GREEN or
GREEN AND YELLOW. The wire coloured BROWN must be connected to the
terminal marked with the letter L or coloured RED. The wire coloured BLUE must be
connected to the terminal marked with the letter N or coloured BLACK or BLUE.
Ensure that the mains socket outlet is situated near your printer, for easy access.
WARNING: THIS APPARATUS MUST BE EARTHED
Ensure that your equipment is connected correctly. If you are in any doubt consult a
qualified electrician.
vii
Setup
Choose a sturdy table, desk or printer stand to place your printer on when you remove
it from the carton box. Remove the styrofoam sides – be sure to save all packing
materials in case you need to ship the printer again – and check the box for these
contents:
●Oki Microline 590/591 Elite printer
●Paper guide
●AC mains cable
●Platen knob (fitted)
●Ribbon cartridge
●Printer handbook
Paper guide
☞
Printer
Platen knob
SEL
SEL
MENU
LF
SHIFT
FF/LOAD
MICRO FEED
TEAR
DOWN
PRINT QUALITY
MICRO FEED
PARK
DOWN
TOP
TOF
CHARACTER PITCH
TOF
AC Mains cable
Ribbon
Note: If any of these items is missing or damaged, see your dealer for a
replacement.
Interface cable and paper are sold separately.
If paper guide is not found in the accessories pack, it may already
be installed in the printer.
1 – 1
Preliminaries
Open the access cover and remove the shipping retainer. (Save the shipping retainer
with the packaging materials, in case you need to ship the printer).
Shipping retainer
PRINT QUALITY
CHARACTER PITCH
QUIET
TOF
TOF
PARK
TEAR
PRINT
FF/LOAD
MICRO FEED
LF
DOWN
SET
MICRO FEED
DOWN
ITEM
SEL
SHIFT
GROUP
SEL
MENU
ALARM
POWER
The platen knob should already be installed, however, if this is not the case , or it has
been removed for any reason, the flat side of the shaft should be lined up with the flat
side of the knob (see diagram).
Platen knob
1 – 2
☞
Connecting to Your Computer
Before you can use your printer, you need to attach it to your computer using an
interface cable.
Notes: Interface cables are not supplied with the printer.
Do not connect serial and parallel cables at the same time.
☞
AC mains cable
1.Make sure both your computer and your printer are switched OFF.
2.Attach the AC mains cable to the socket in the rear of the printer, and plug it into
an earthed power source.
Note: Do not use an unearthed adapter with your printer. The printer must
be connected to an earthed power supply.
3.Plug the printer end of your interface cable into the connector at the rear of the
printer.
4.Connect the other end of your interface cable to the printer port on your computer.
Interface cable
1 – 3
Installing the Ribbon Cartridge
IMPORTANT
You have just bought the best printer, so be sure to use the only ribbons recommended
for it. Original Oki ribbons are the only ones recommended. Ask for them by name.
Please remember that if you buy any other ribbon your warranty may be invalidated.
Purchasing inferior ribbons really does not make sense. They do not last as long. They
are prone to shredding, which can cause damage to your printhead. That is why any
short term savings on cheaper ribbons are quickly lost.
So do not waste your time and money. Insist on Oki consumables for your Oki printer.
You can order them from your printer supplier.
1.Unpack the ribbon cartridge.
☞
2.Open the printer access cover.
3.Centre the printhead.
Centre the print head
PRINT QUALITY
CHARACTER PITCH
QUIET
TOF
TOF
PARK
TEAR
PRINT
FF/LOAD
MICRO FEED
LF
DOWN
SET
MICRO FEED
DOWN
ITEM
SEL
SHIFT
GROUP
SEL
MENU
ALARM
POWER
Note: The printhead can get very hot during extended periods of printing—
be sure to let it cool off before you touch it.
4.Place the ribbon into the printer, push down so that the cartridge snaps into
position.
5.Turn the blue take-up knob clockwise to take up any ribbon slack.
1 – 4
Installing the Paper Guide
SEL
SEL
MENU
LF
SHIFT
FF/LOAD
MICRO FEED
TEAR
DOWN
MICRO FEED
DOWN
PRINT QUALITY
PARK
TOP
TOF
CHARACTER PITCH
TOF
Paper guide
Locate lugs into
grooves in paper
guide, and lift
Paper guide
1 – 5
☞
Self Adjust Function
The self adjust function maintains the correct head gap setting and improved print
quality.
When the printer is powered up without paper, the printer starts the self adjust cycle
automatically after initialisation.
Use this function regularly when rear or bottom paper feed is used, and approximately
every one box or 2000 sheets.
Note: The printer ribbon must be installed before the self adjust function
is performed.
•Switch on the printer, the Power/ALARM lamp comes on and the printhead
assembly moves to its home position.
☞
•The Print Quality/Character Pitch lamp comes on.
•The Self Adjust cycle starts.
Note: Before replacing your printers ribbon deselect the printer, this will
centre the printhead (approximately two seconds) and maximise the head
gap (position 9). Once this has been done the old ribbon can be removed
and the new ribbon installed.
1 – 6
Loading Rear Feed Continuous-Form Paper
When printing on rear feed continuous form paper use the built-in tractor.
1.Lift the rear paper guide
into the upright position.
2.Move the centre paper supports, on the tractor unit, to the middle of the paper.
Paper lever
Tractor unit
Paper support
3.Move the left hand tractor to the required position. (Pull the lever forwards to
unlock the tractor and slide to adjust. Push the lever back to lock.)
Paper guide removed
for clarity
1 – 7
4.Open the tractor covers and set the first two sprocket holes on the paper on the
tractor pins.
Continuous
paper
Tractor cover
Lever
5.Adjust the right hand tractor to the width of the paper.
6.Close the tractor covers.
7.Lower the paper guide back into its horizontal position.
8.Pull the paper lever forwards (to the REAR paper symbol).
9.Press the FF/LOAD button to advance the paper to the front of the printer.
10.Set the Top Of Form, refer to Setting the TOF described in this chapter, to your
requirements and you are ready to print.
1 – 8
Loading Single Sheet Paper
(No paper handling options installed)
PRINT QUALITY
SEL
SEL
MENU
EXIT
POWER
SHIFT
ALARM
LFFF/LOAD
Micro Feed
Down
Micro Feed
Up
GROUPITEM
TEARPARKQUIET
SET
PRINT
MENU
TOF
LQ
UTILITY
CHARACTER PITCH
10
RESET
17
COURIER
PRESTIGE
12
20
ROMAN
SWISS
GOTHIC
BOLD
15
PROP
1.If you have continuous-form paper in the printer, use the paper PARK feature to
back it out of the printer. Press the PARK button. The paper will retract from the
front of the printer.
2.Move the paper lever back to the single sheet setting (towards the back of the
printer – middle setting).
3.Raise the paper guide to its upright position.
Paper guides
Paper
4.Place a sheet of paper on the support and adjust the guides for the width of the
paper you are using. Start with the reference mark for the left edge. The paper will
then load automatically .
5.Adjust the TOF if necessary. Refer to Setting the TOF described later in this
chapter.
SEL
SEL
MENU
LF
SHIFT
FF/LOAD
MICRO FEED
TEAR
DOWN
PRINT QUALITY
MICRO FEED
PARK
DOWN
TOP
TOF
CHARACTER PITCH
TOF
1 – 9
Printable Ar e a
The default top margin when using single sheets is 0.35 inch (8.89mm). However, the
1
top of form position can be adjusted by micro feed in steps of
position of 0.02 inches (0.5mm) from the top edge of the paper.
¦180 inches to a minimum
0.02 inch
minimum
(0.5mm)
0.02 inch
minimum
(0.5mm)
▼
▲
▼
▲
▲
0.16
inch
(4.1mm)
Additional Area
Additional Area
▲
▲
0.12
inch
(3.0mm)
▲
0.35 inch top
margin default
▼
(8.89mm)
Printable area
▲
0.5 inch bottom
margin default
▼
(12.7mm)
▲
The bottom margin defaults to 0.5 inches (12.7mm) with Bottom Margin Valid set in
the menu. If this menu item is set to Invalid, the bottom margin will be controlled by
the Page Length setting, and will allow printing to a minimum distance of 0.02 inches
(0.5mm) from the bottom edge of the page.
Note: Care should be exercised to ensure that the correct page length
☞
1 – 10
setting is selected when the Bottom Margin Invalid option is chosen, as
overprinting on to the platen roller could occur, damaging both the
printhead and the roller.
Paper Park
Switching between continuous-form paper and single sheet paper is particularly easy
with your printer. Its automatic parking feature allows you to back continuous-form
paper out of the paper path at the touch of a button, and at the touch of another button
automatically positions a single sheet. The paper park feature still works when you
have an optional CSF installed on your printer whilst using continuous-form paper.
Continuous-form to Single Sheets
1.Press the PARK button. The continuous-form paper will retract from the paper
path.
2.Move the paper lever back (to the single sheet setting).
3.Press the FF/LOAD button to advance a sheet into the printer.
Single Sheet to Continuous-form
1.If there is a sheet in the printer, press the FF button to eject it.
2.Pull the paper lever forward (to the continuous-form setting).
3.Press the FF/LOAD button to advance the continuous-form paper to the front of
the printer.
1 – 11
Setting the TOF
This establishes the position of the first print line on each page. The red line and M
character on the ribbon shield show the baseline of the current position and help place
the TOF where it is needed. To activate TOF press SHIFT and TOF together when the
SEL lamp is out.
If you are using a word processor that sets its own top margin, set the TOF for the
topmost line on the page. Otherwise we recommend positioning the top of the page in
line with the top of the plastic ribbon protector, attached to the printhead mechanism;
the first line of printing will then be about one inch from the top of the page.
1.Press the FF/LOAD button to advance the paper into the printer.
2.Press the SEL button so that the lamp goes out.
3.Continuous-form paper/Single Sheet paper: Hold down the SHIFT button and
use the MICRO FEED buttons corresponding to the direction you wish to move
the page. When the paper is in the correct position release both buttons.
4.Press the SEL button to re-select the printer.
When using the MICRO FEED buttons paper is moved in increments of
allowing accurate positioning of the TOF.
1
¦180 inch
1 – 12
Clearing Paper Jams
In the unlikely event that you experience paper jams while using either continuousform paper or single sheets, the following guidelines explain in detail the correct
procedure for the removal and resetting of the jammed paper.
1.Turn the printer OFF.
2.Open the access cover.
3.Tear the paper off at the position of the push/pull tractor if you are using
continuous form paper.
4.If paper is jammed at the ribbon protector, move the printhead assembly away
from the jam carefully (ensure that there is no paper between the ribbon protector
and the platen) and turn the platen knob to feed the remaining paper out of the front
of the printer. If the paper jam occurs before the ribbon protector, turn the platen
knob so that the paper retracts along its loading path.
5.Clear the paper path and ensure that there are no scraps of paper left in the paper’s
loading path or the printer.
6.The printer is now ready for use.
1 – 13
☞
Running a Self Test
After you have installed the ribbon and loaded paper, you are ready to run either of the
two self tests. These tests allow you to check that your printer is functioning properly.
Holding down the QUIET/TOF button while switching the printer ON produces a
continuous sample of the default print style.
Note: This sample prints along the entire length of the platen, so be sure
to use wide paper when running this test.
ML591Elite IEEF/W 05.00YR4084-3066-06
F/W 03.03
CG 03.01
Holding down the LF button while turning the printer ON produces a limited sample
of each available print style.
ML591EliteIEEF/W 05.00YR4084-3066-06
CG 03.01
When complete (three pages), the printer stops and the SEL lamp comes on.
To terminate either of these two self-tests, press the SEL button. This will return the
printer to its ready state and the SEL lamp will be lit.
1 – 14
Optional Accessories
The following items are optional accessories for your printer.
Instructions for the installation of these items will be supplied with each accessory.
1. Cut Sheet Feeder
Cut Sheet Feeder
2. Pull Tractor and Cover
Available Types:
– Single bin 80 column
– Dual bin 80 column
– Single bin 136 column
– Dual bin 136 column
SEL
SEL
MENU
LF
SHIFT
FF/LOAD
MICRO FEED
TEAR
DOWN
PRINT QUALITY
MICRO FEED
PARK
DOWN
TOP
TOF
CHARACTER PITCH
TOF
Available Types:
– 80 column
– 136 column
3. Bottom Push Tractor Unit, Printer Stand and Tear Bar
Available Types:
– 80 column
– 136 column
Tear Bar
Printer Stand
1 – 15
4. Font Card/RAM Card
y
y
Available Types:
INSERT
THIS SIDE UP
– East Europe All
– ECMA-94/Roman 8
ML590/591
– Greek
– OCR All
– Hebrew
FONT CARD
People to People Technolog
Made in Japan
5. Colour Printer Ribbon Kit
Ribbon lifting
mechanism
INSERT
THIS SIDE UP
ML590/591
RAM CARD
People to People Technolog
Made in Japan
32Kb for
Receive Buffer
(total 96Kb.)
Colour printer ribbon
6. Roll Paper Stand
Mounting plate
Ribbon advance key
Roll paper stand
1 – 16
☞
7. Serial Interface Board.
Available Types:
– RS-232C Serial Interface board and
Current Loop Serial Interface Board
combined
– RS-422A Serial Interface board
IMPORTANT
Parallel and serial interface cables should not be connected to your printer
simultaneously.
1 – 17
Operation
Using the Control Panel
The control panel puts many of your printer’s functions within reach of your fingertips.
It even lets you customise your printer for special applications without programming.
Experiment with these controls and you will see how much your printer can do and how
easy it is to use. The next few pages explain the basics of using the control panel.
SEL
SEL
MENU
EXIT
POWER
SHIFT
ALARM
LFFF/LOAD
Micro Feed
Down
GROUPITEM
Micro Feed
Up
TEARPARKQUIET
SET
MENU
PRINT
TOF
PRINT QUALITY
CHARACTER PITCH
RESET
LQ
UTILITY
10
17
COURIER
PRESTIGE
12
20
ROMAN
SWISS
GOTHIC
BOLD
15
PROP
Basic Controls
POWER light: Lit when On.
ALARM light: Lit to indicate alarm condition: paper out, paper jam, cover open.
LF button: Moves paper up one line (when printer is selected or deselected). If a CSF
is installed on the printer, pressing the LINE FEED button will cause a single sheet to
be inserted when there is no paper in the printer.
FF/LOAD button: Advances paper to the top of the next page (when printer is selected
or deselected). When bottom or rear feed is selected, the paper is loaded from the
tractor.
SHIFT and QUIET/TOF button: When the printer is deselected this button sets the
position of the Top Of Form. The TOF setting is not effective in single sheet mode.
SEL button: Selects or deselects the printer. When selected, the printer is ready to
receive data; when deselected, it will not print. Pressing this button during a self-test
will terminate the test and return the printer to its ready state.
SEL lamp: Lights when printer is selected (ready to receive data); goes out when it is
deselected. The light blinks when the printer is in Print Suppress mode (refer to the
Menu Settings for more details).
2 – 1
PRINT QUALITY: Selects the quality and print style of the typeface.
CHARACTER PITCH: Selects the size of the printed characters.
PARK: Selects the park position for continuous paper, allowing single sheets to be fed
from the front of the printer.
TEAR: Advances the paper to the tear off position (serrated bar above acoustic cover),
allowing continuous paper to be torn off at random.
MICRO FEED: Advances the paper 1/180 inch in the direction of the arrows for fine
adjustment (up or down).
When pressing the MICRO FEED button (up or down) with the SHIFT button the
insert position for paper is set.
SHIFT button: Expands the facility of the buttons.
QUIET button: Selects the quiet printer mode.
Switch Combinations
The following buttons have special functions when held down during power up:
LF: Activates the print samples self-test.
LF and SEL: Resets the Menu to the factory settings.
QUIET/TOF: Activates the rolling ASCII print self-test.
SEL and FF/LOAD: Puts the printer into the Hex Dump Mode.
FF/LOAD and TEAR: Returns the printer to the default Menu (factory) settings.
This option also sets the insert position for paper to the factory setting.
PARK and QUIET/TOF: This option sets the insert position for paper to the factory
setting.
2 – 2
Button Functions in Menu Select Mode
When the printer is in the MENU select mode, the features listed below the buttons are
activated.
MENU and SHIFT: Enters the MENU mode.
PRINT: Prints the current menu settings.
GROUP: Switches between the broad menu categories (FWD. direction).
SHIFT and GROUP: Switches between the broad menu categories (REV. direction).
ITEM: Displays the features contained in each of the categories (FWD. direction).
SHIFT and ITEM: Displays the features contained in each of the categories (REV.
direction).
SET: Selects and stores the options available for each feature in the menu (FWD.
direction).
SHIFT and SET: Selects and stores the options available for each feature in the menu
(REV. direction).
SHIFT and EXIT: Exits from the menu select mode and returns the printer to its ready
state. The buttons are returned to their basic functions.
SHIFT and PRINT: Prints the current menu group settings.
2 – 3
Print Characteristics
The print quality and character pitch buttons let you control basic printing features
through your printer’s control panel:
1.Press the SEL button (SEL light goes out).
2.Press the features that you wish to change (light goes on).
3.Press the SEL button.
The panel always indicates the actual settings of the printer. If you change any of these
features through your software, the panel lights will also change to reflect this feature
choice.
The panel will only allow you to select valid combinations of features. For example,
proportional spacing can only be selected when the print quality choice is set to LQ.
The two printing features available on the control panel offer the following selection
of modes:
Print Quality
There are seven resident fonts which can be selected on your printer. For an example
of each please refer to the self test print out.
similar to a typewriter. Print in COURIER when you
want your correspondence and reports to look especially
polished. You can use COURIER mode to print 10, 12,
15, 17.1 and 20 Characters Per Inch (CPI), as well as
proportional spacing.
ROMANThe ROMAN mode also produces crisp, clean serif
characters in the same way as COURIER. You can use
ROMAN mode to print 10, 12, 15, 17.1 and 20 Characters
Per Inch (CPI), as well as proportional spacing.
GOTHICThe GOTHIC mode also produces crisp, clean sans serif
characters in the same way as COURIER. You can use
GOTHIC mode to print 10, 12, 15, 17.1 and 20 Characters
Per Inch (CPI), as well as proportional spacing.
SWISS BOLDThe SWISS BOLD mode also produces crisp, clean
characters in the same way as SWISS, however the
characters are emphasised. You can use SWISS BOLD
mode to print 10, 12, 15, 17.1 and 20 Characters Per Inch
(CPI), as well as proportional spacing.
SWISSThe SWISS mode also produces crisp, clean sans serif
characters in the same way as COURIER. You can use
SWISS mode to print 10, 12, 15, 17.1 and 20 Characters
Per Inch (CPI), as well as proportional spacing.
PRESTIGEThe PRESTIGE mode also produces crisp, clean serif
characters in the same way as COURIER. You can use
PRESTIGE mode to print 10, 12, 15, 17.1 and 20
Characters Per Inch (CPI), as well as proportional spacing.
2 – 5
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