User’s
Guide
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Safety
Your Oki 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:
• Be certain that your power source matches the rating listed
on the back of the printer. If you aren’t sure, check with your
dealer or with your local power company.
• Your printer has a grounded, 3-prong plug as a safety feature.
It will only fit into a grounded outlet. If you can not plug it
in, chances are that you have an older, non-grounded outlet.
Contact an electrician to have it replaced with a grounded
outlet. Do not use an adapter to defeat the grounding.
• Carefully read all setup and operating instructions. Be sure
to save all documents for future reference.
• Read and follow all warning and instruction labels on the
printer itself.
• To avoid damaging the power cord, do not put anything on it
or place it where it will be walked on. If the cord becomes
damaged or frayed, replace it immediately.
• Place your printer on a firm, solid surface. If you put in on
something unsteady, it might fall and be damaged.
• Avoid overheating the printer. Do not place it on a soft
surface, such as a rug, sofa, or bed. The vents may be
blocked, causing the printer to overheat.
• If you’re using an extension cord 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
rating. Generally, the total ratings of all equipment plugged
into any one power line should not exceed 15 amperes. Don’t
exceed this unless you know that the power line your
• The printer must be installed near a power outlet which will
remain easily accessible.
equipment is plugged into has a rating above 15 amperes.
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• Unplug the printer before you clean it. Use only a damp
cloth. Do not use liquid or aerosol cleaners.
• If anything happens that indicates that your printer is not
working properly or has been damaged, unplug it
immediately. Then, follow the procedures in “Service and
Support” for having your printer serviced.
• 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.
These are some of the things to look for:
– The power cord or plug is frayed or damaged.
– Liquid has been spilled into the housing, or the printer has
been exposed to water.
• 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.
– The printer has been dropped or its cabinet has been
damaged.
• Do not use your printer near water. Do not spill liquid of any
kind into it.
– The printer doesn’t function normally when you’re
following the operating instructions.
• 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 this
document, don’t try to service the printer yourself. Opening
the cover may expose you to shocks or other hazards. Don’t
make any adjustments other than those outlined in the
document. You might cause damage requiring extensive
repair work.
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Contents
Top of Form (TOF) ....................................................................... 12
Top of Form (TOF) and Forms Tear-Off.................................... 12
Determining if Forms Tear-Off is Off or On .............................. 13
Setting Top of Form (TOF):
Safety............................................................................ 3
Chapter 1: Introduction ............................................. 7
Printer Features............................................................................... 7
Forms Tear-Off OFF (Default Setting) ...................................... 14
Setting Top of Form (TOF):
Chapter 2: Helpful Hints ........................................... 8
Saving Money: Forms Tear-Off...................................................... 8
Saving Time .................................................................................... 8
Internet Support ........................................................................... 8
Paper Park .................................................................................... 8
Operation Tips ................................................................................ 9
Top of Form (TOF) ...................................................................... 9
Turning the Platen Knob .............................................................. 9
Controlling Access to the Printer ................................................. 9
Forms Tear-Off Set to ON .......................................................... 15
Temporarily Changing the Top of Form Position ...................... 16
Resetting Top of Form to the Factory Default ........................... 16
Forms Tear-Off Feature ................................................................ 17
Potential Problems with Software Packages .............................. 17
Changing the Forms Tear-Off Setting ........................................ 18
Manual Forms Tear Off .............................................................. 18
Paper Park..................................................................................... 18
Changing Paper Paths................................................................... 19
Printhead Gap ............................................................................... 21
Print Quality ................................................................................. 22
Character Pitch ............................................................................. 23
Printer Reset ................................................................................. 24
Emulations .................................................................................... 24
Chapter 3: Using Your Printer ................................ 10
Parts Identification: Rear Feed (Continuous Forms).................... 10
Parts Identification: Top Feed (Single Sheets) ............................. 11
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Chapter 4: Menu Mode ............................................ 25
Menu Mode Keys ....................................................................... 25
Entering and Exiting Menu Mode ............................................. 26
Resetting the Menu to the Factory Defaults .............................. 26
Printing the Menu Settings......................................................... 26
Changing the Menu Settings ...................................................... 27
Menu Settings Table ................................................................... 28
Explanations of Menu Items ...................................................... 35
Appendix B: Printer Control Codes ....................... 69
IBM Proprinter III Commands ..................................................... 69
Epson FX Commands................................................................... 72
Oki MICROLINE Standard Commands ...................................... 75
Appendix C: Specifications...................................... 78
Appendix D: Installation.......................................... 84
Location ........................................................................................ 84
Unpack.......................................................................................... 84
Install the Ribbon Cartridge ....................................................... 87
Power Connection ........................................................................ 88
Computer Connections ................................................................. 88
Parallel (LPT): IEEE 1284 ......................................................... 88
USB: Specification 1.1 Compliant ............................................. 89
Loading Paper............................................................................... 89
Testing the Printer......................................................................... 90
Font Sample Test ........................................................................ 90
Rolling ASCII Test ..................................................................... 91
Hexadecimal Dump Mode ......................................................... 92
Emulations .................................................................................... 92
Printer Drivers .............................................................................. 92
Loading the OKI Driver ............................................................. 93
Using a Compatible Driver ........................................................ 93
Chapter 5: Maintenance........................................... 42
Replacing the Ribbon Cartridge ................................................... 42
Loading Paper............................................................................... 44
Rear Feed ................................................................................... 44
Top Feed (Single Sheets) ........................................................... 53
Clearing Paper Jams ..................................................................... 55
Rear-Feed Paper Jams ................................................................ 55
Rear-Feed, Repeating Paper Jams.............................................. 56
Single-Sheet Paper Jams ............................................................ 58
Cleaning the Housing ................................................................... 59
Chapter 6: Troubleshooting ..................................... 60
General Information ..................................................................... 60
Problems / Solutions ..................................................................... 61
Appendix A: Parts & Accessories............................ 66
Purchasing Parts & Accessories ................................................... 66
Replacement Parts ........................................................................ 67
Accessories ................................................................................... 68
Index .......................................................................... 94
6
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Chapter 1: Introduction
Printer Features
Oki Data on the Internet
• Super reliable, durable operation: 20,000 hours Mean Time
Between Failures (MTBF) at 25% duty cycle and 35% page
density
The Oki Data Web Sites provide the most current information
available on your printer.
On-line documents are available for viewing and downloading
via Oki Data’s Web Sites.
• Advanced paper handling, with built-in rear push tractor and
zero-tear forms capability.
You may reach Oki Data via the Internet at:
• Blazing print speeds, in characters per second:
– High Speed Draft (HSD) Mode: 507 cps
– Utility Mode: 380 cps
• my.okidata.com
– Near Letter Quality (NLQ) Mode: 95 cps
– Super Speed Draft (SSD) Mode: 570 cps
• This rugged 9-pin printer can meet the needs of harsh and
demanding environments.
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Chapter 2: Helpful Hints
Saving Money: 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.
Saving Time
Internet Support
Oki Data provides support via the Internet:
Data’s products and services.
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.
site designed to help you personalize the information and
service you get from Oki Data.
Paper remains in the tear-off position until the printer receives
more data. Then, the paper moves back down for printing.
Paper Park
Note: This feature is normally turned off.
Your printer’s paper park feature allows you to print a single
sheet (cut-sheet) page without removing continuous feed paper
from the printer.
Importa nt!
Forms Tear-Off and the Top of Form settings interact. For
more information, see “Top of Form (TOF) and Forms Tear-
Off” in Chapter 3.
For more information, see “Paper Park” in Chapter 3.
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Turning the Platen Knob
Operation Tips
Top of Form (TOF)
Important!
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 misaligns.
Top of Form (TOF) sets the print start position. The factory
default is 1" from the top.
The Top of Form can be changed in increments of 1/180",
either for a single print job or set to a new default. The overall
amount of adjustment is limited to avoid paper jams.
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.
The first line prints at the red line of the plastic paper shield (1)
on the printhead.
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
Chapter 3.
For more information, see “Top of Form (TOF)” in Chapter 3.
Helpful Hints
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Chapter 3: Using Your Printer
Note: For rear feed, the paper lever must be forward.
Parts Identification: Rear Feed
(Continuous Forms)
Note: The serial number of your printer is on a label on the
back, beside “S/N.”
Sheet Guide
Paper Lever
On-Off Switch
Platen Knob
Control Panel
Acoustic Cover
Access Cover
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Note: For single-sheet printing, the paper lever must be in the
middle position.
Parts Identification: Top Feed
(Single Sheets)
Paper Guides
Sheet Guide
Paper Lever
On-Off Switch
Platen Knob
Control Panel
Acoustic Cover (open)
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Top of Form (TOF) and Forms Tear-Off
Top of Form (TOF)
Importa nt!
If you turn the platen knob when the printer is on, the Top of
Form misaligns. Always shut the printer off 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).
Note: The factory default setting for the Top of Form (where
the printing should begin) is 1" down from the top of the
page.
Top of Form sets the print start position for the printer. It is
adjustable in increments of 1/144 of an inch. The 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.
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To use the TEAR key:
Determining if Forms Tear-Off is Off or On
There are two ways to determine the status of the Forms
1 Make sure paper is loaded.
Tear-Off menu setting:
2 Press TEAR (3).
• If the paper moves up, Forms Tear-off is off.
• If the paper moves down, Forms Tear-off is on.
• Print the Menu.
• Use 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).
Using Your Printer 13
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With paper loaded and the printer on and selected:
Setting Top of Form (TOF):
1 Press SEL | MENU (1) to take the printer off line.
Forms Tea r-Off OFF (Defa ult Setting)
The SEL light goes out.
Importa nt!
2 Press and hold SHIFT (2), then
If you turn the platen knob when the printer is on, the Top of
Form misaligns. Always turn the printer off before turning
the platen knob!
Note: When you begin pressing the Micro Feed key, the
printhead will move to the right.
• Press LF | Micro Feed Down (3) to set the TOF higher (the
paper moves down).
• Press FF/LOAD | Micro Feed Up (4) to set the TOF lower
(the paper moves up).
3 When you have the TOF set where you want it, press and
hold SHIFT (2), then press QUIET/TOF (7) to engage the new
setting.
The printhead moves back to the left margin.
Note: The first line prints at the red line (1) of the plastic
paper shield on the printhead.
4 Press SEL/MENU (1) to save the setting and place the printer
back on line.
Note: To reset the Top of Form to the factory default, see
“Resetting Top of Form to the Factory Default” later in
this chapter.
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2 Press SHIFT (2) and QUIET/TOF (7) to reset the current TOF.
Setting Top of Form (TOF):
Forms Tea r-Off Set to ON
3 Press FF/LOAD (4) to load the paper.
4 Wait briefly until the paper moves up to the tear position,
then press and hold TEAR (5).
Importa nt!
If you turn the platen knob when the printer is on, the Top of
Form misaligns. Always turn the printer off before turning
the platen knob!
The paper moves to the current TOF.
5 Keep holding TEAR, then press and hold SHIFT (2) and
release TEAR.
6 Continue to hold SHIFT, then
Note: When you begin pressing the Micro Feed key, the
printhead will move to the right.
• Press LF | Micro Feed Down (3) to set the TOF higher (the
paper moves down).
• Press FF/LOAD | Micro Feed Up (4) to set the TOF lower
(the paper moves up).
Note: The first line prints at the red line (1) of the plastic
paper shield on the printhead.
7 When you have the TOF set where you want it, press and
hold SHIFT (2), then press QUIET/TOF (7) to engage the new
setting.
The printhead moves back to the left margin.
8 Press SEL/MENU (1) to save the setting and place the printer
back on line.
With paper loaded and the printer on and selected:
Note: To reset the Top of Form to the factory default, see the
next page.
1 Press PARK (6) to park the paper.
The SEL light goes off and the red alarm light comes on.
Using Your Printer 15
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Temporarily Changing the Top of Form
Position
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.
Importa nt
To reset the Top of Form to the factory default:
1 Remove paper from the paper path.
2 Turn the printer off.
Do not use the platen knob to change the Top of Form. If you
turn the platen knob when the printer is turned on, the Top of
Form misaligns. Always turn the printer off before turning
the platen knob!
3 Press and hold PARK + QUIET/TOF while turning on the
To move the Top of Form position lower for one page only:
1 Press SEL to deselect the printer.
printer.
4 Reload paper.
2 Press LF to lower the position of the Top of Form.
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Notes: 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.
Forms Tear-Off Feature
Note: 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 next page).
Do not use Forms Tear-Off with labels or multipart
forms!
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).
Forms Tear-Off cannot be used when the optional pull
tractor is engaged.
Potential Problems 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.
When the printer is turned on, the paper feeds to the tear-off
position.
When data is received, the paper automatically moves down to
the print position (TOF) and printing begins.
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 next page).
Note: You can also move the paper down to the print position
manually by pressing TEAR.
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.
Using Your Printer 17
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Changing the Forms Tear-Off Setting
Manual Forms Tear Off
If you don’t wish to engage the Forms Tear-Off feature, you
can advance
Note: The default setting for Forms Tear-Off is OFF.
• rear-feed continuous forms loaded on the built-in tractor
or
• bottom-feed continuous forms loaded on the optional push
tractor
up to the tear off position manually by pressing TEAR (5).
Paper Park
Importa nt!
To change the Forms Tear-Off setting:
1 Press SHIFT (2) + SEL (1).
Never park labels!
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,
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.
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.
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4 Move the paper lever (1) to the middle position marked
Changing Paper Paths
“TOP.”
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.
5 Adjust the paper guides (1) for the size paper you are using,
then place a sheet of paper in the sheet guide.
3 Pivot the wire feed guide into the sheet guide.
Using Your Printer 19
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4 Move the paper lever to the appropriate position.
Single Sheets to Continuous Forms
1 Press FF/LOAD to remove the single-sheet paper.
• Rear feed:
2 Lower the sheet guide into the continuous-forms position.
• Bottom feed:
3 Swing the wire feed guide over onto the pull-up roller.
5 If necessary, load continuous-form paper.
6 Press FF/LOAD.
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To adjust the gap, open the access cover and move the blue
lever (1) to the recommended setting from the table.
Printhead Gap
The printhead gap is the distance between the printhead and the
platen.
CAUTION!
Make sure the printer is turned off before you open the access
cover.
Setting
Media
1
2
3
4
5
Regular paper
2-part form (with carbon)
3-part form (with carbon)
4-part form (with carbon)
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.
Using Your Printer 21
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HSD: High Speed Draft
Print Quality
Importa nt!
Front panel settings for print quality and character pitch are
normally overridden by software commands.
• Lower quality, higher speed (507 cps)
• Gothic typeface only
SSD: Super Speed Draft
• Lowest quality, highest speed (570 cps)
• Gothic typeface only
NLQ: Near Letter Quality
• Highest quality, slowest speed (95 cps)
• Courier or Gothic
Press PRINT QUALITY (1) to select:
UTL: Utility—the default
• Medium quality, medium speed (380 cps)
• Gothic typeface only
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Epson and IBM Emulations
Set the character pitch by pressing CHARACTER PITCH (1)
until the light beneath the desired setting is lit:
Character Pitch
Important!
Front panel settings for character pitch are normally
overridden when the SI command is received from your
software.
• 10 cpi
• 12 cpi
• 15 cpi
• 17 cpi
• 20 cpi
• Proportional
MICROLINE Emulation
In the MICROLINE emulation, the Character Pitch choices are:
Character pitch determines how many characters will print on
each line. You can choose a specific fixed width for each
character in characters per inch (CPI), or Proportional. The
higher cpi settings are often used for spreadsheets.
• 10 cpi, Proportional or non-proportional
• 12 cpi, Proportional or non-proportional
• 15 cpi, Proportional or non-proportional
• 17 cpi, Proportional or non-proportional
• 20 cpi, Proportional or non-proportional
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 lit.
To select non-proportional, press the CHARACTER PITCH key
until the light for the cpi value you wish to use is lit.
Note: To reset the printer to the factory default character
pitch, deselect the printer, then press and hold the
SHIFT key while pressing the CHARACTER PITCH key.
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Printer Reset
Clearing some error conditions requires that you reset
(reinitialize) the printer. To do this:
Emulations
• IBM® Proprinter III — factory setting
• Epson® FX
• Oki® MICROLINE®
1 Press and release SEL (1) to take the printer off-line.
The SEL light goes out.
Changing Emulations
2 Press and hold SHIFT (2), then press the RESET/
1 Make sure paper is loaded.
CHARACTER PITCH key.
2 Press and hold SHIFT (2), then press SEL (1).
Importa nt!
3 Press LF (3).
Pressing SHIFT + RESET reinitializes 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.
The following line prints:
Printer Control Emulation Mode IBM PPR
4 Press TEAR (4) repeatedly until the emulation you wish to
select prints in the right-hand column.
5 Press and hold SHIFT (2), then press SEL (1) to save your
setting and exit the Menu Mode.
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Chapter 4: 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.
GROUP Key
Prints the next Group in the Menu.
With the SHIFT key, prints the previous Group.
In Menu Mode, you use the front panel keys to change the
defaults for the printer parameters. The changes you make in
the Menu Mode are automatically saved when you exit the
Menu Mode and are retained, even when you turn the printer
off.
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.
Menu Mode Keys
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
Glows when the printer is in the Menu Mode.
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Entering and Exiting Menu Mode
Printing the Menu Settings
To enter or exit the Menu Mode, hold SHIFT while pressing
SEL.
Printing the Current Menu Settings
1 Make sure paper is loaded in the printer.
2 Press and hold SHIFT, then press SEL to enter the Menu
Resetting the Menu to the Factory Defaults
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.
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:
To reset the Menu to the standard settings (factory defaults):
1 Turn the printer off.
1 Make sure paper is loaded in the printer.
2 Press SEL + LF while turning the printer on.
2 Press and hold SHIFT, then press SEL to enter the Menu
Mode.
3 Press and hold SHIFT, then press PRINT QUALITY.
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Changing the Menu Settings
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.
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:
a Press GROUP until the Group you wish to change appears
in the first column.
b Press ITEM until the Item you wish to change appears in
the second column.
c Press SET until the setting you want appears in the third
column.
3 Press and hold SHIFT, then press SEL to exit the Menu Mode
and save your settings.
Importa nt!
If you turn off the printer without first exiting the Menu
Mode, the changes you have made will be lost.
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Menu Settings Table
For a complete explanation of each menu item, see “Explanations of Menu Items” later in this chapter.
The table below 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.
Group
Item
Settings (Defaults are set in bold italic)
Printer Control Emulation Mode
IBM PPR, Epson FX, ML
Font
Print Mode
LQ Courier, LQ Roman, LQ Swiss, LQ Swiss Bold, LQ Orator, LQ Gothic,
LQ Prestige, Utility, HSD
DRAFT Mode
HSD, SSD
Pitch
10 cpi, 12 cpi, 15 cpi, 17.1 cpi, 20 cpi
No, Yes
Proportional Spacing
Style
Size
Normal, Italics
Single, Double
Symbol Sets
Character Set
• Set I, Set II [Epson and IBM mode]
• Standard, Line Graphics, Block Graphics [ML Mode]
Language Set
American, French, German, British, Danish I, Swedish, Italian, Spanish I,
Japanese, Norwegian, Danish II, Spanish II, Latin American, French Canadian,
Dutch, Publisher
Zero Character
Code Page
Slashed, Unslashed
USA, Canada French, Multilingual, Portugal, Norway, BRASCII, Abicomp,
Multilingual 858, ISO 8859-15
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Menu Settings Table (Continued)
Group
Item
Settings (Defaults are set in bold italic)
Rear Feed
Line Spacing
6 LPI, 8 LPI
Form Tear-Off
Off, 500 ms, 1 sec, 2 sec
Skip Over Perforation
Page Width (wide model)
Page Length
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
6 LPI, 8 LPI
Form Tear-Off
Off, 500 ms, 1 sec, 2 sec
Skip Over Perforation
Page Width (wide model)
Page Length
No, Yes
13.6", 8"
11", 11-2/3", 12", 14", 17", 5", 3", 3.25", 3.5", 4", 5.5", 6", 7", 8", 8.5"
Mode Menu 29
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Menu Settings Table (Continued)
Group
Item
Settings (Defaults are set in bold italic)
Top Feed
Line Spacing
6 LPI, 8 LPI
Form Tear-Off*
Bottom Margin
Page Width (wide model)
Page Length
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"
500 ms, 1 sec, 2 sec
Wait Time
Page Length Control
by Actual Page Length, by MENU Setting
Set-Up
Graphics
Bi-directional, Uni-directional
7 or 8 Bit Graphics†
Receive Buffer Size
Paper Out Override
8, 7
1 Line, 32K, 64K, 128K
No, Yes
* Appears only when the optional Roll Paper Stand is installed.
† Appears only when the MICROLINE emulation is selected.
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Menu Settings Table (Continued)
Group
Item
Settings (Defaults are set in bold italic)
Setup (cont..)
Print Registration 1
0, range to 0.25 mmm 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.
Print Registration 2
0, range to 0.25 mmm 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.
7 or 8 Bits Data Word*
Operator Panel Function
Reset Inhibit
8, 7
Full Operation, Limited Operation
No, Yes
No, Yes
Print Suppress Effective
Auto LF
Auto CR†
No, Yes
No, Yes
Bin 1, Bin 2
No, Yes
CSF Bin Select**
Print DEL Code*
* Appears only when MICROLINE emulation is selected.
† Appears only when the IBM emulation is selected.
** Appears only if the optional Cut Sheet Feeder is installed.
Mode Menu 31
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Menu Settings Table (Continued)
Group
Item
Settings (Defaults are set in bold italic)
SI Select Pitch (10 cpi)*
SI Select Pitch (12 cpi)*
Time Out Print
Auto Select
15 cpi, 17.1 cpi
12 cpi, 20 cpi
Valid, Invalid
No, Yes
Centering Position
CSF Type†
DEFAULT, MODE 1, MODE 2
Wide, Narrow
Power Saving
Power Save Time
I-Prime
Enable, Disable
5 min, 10 min, 15 min, 30 min, 60 min
Buffer Print, Buffer Clear, Invalid
+5V, Open
Parallel I/F
Pin 18
Auto Feed XT**
Bi-Direction
Invalid, Valid
Enable, Disable
* Appears only when the IBM emulation is selected.
† Appears only when optional Cut Sheet Feeder is installed.
** Appears only if the Epson emulation is selected.
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Menu Settings Table (Continued)
Group
Item
Settings (Defaults are set in bold italic)
Serial IF*
Parity
None, Odd, Even
Serial Data 7/8 Bits
Protocol
8 Bits, 7 Bits
Ready/Busy, X/On / X/Off
Diagnostic Test
Busy Line
No, Yes
SSD-, SSD+, DTR, RTS
Baud Rate
19200 bps, 9600 bps, 4800 bps, 2400 bps, 1200 bps, 600 bps, 300 bps
DSR Signal
DTR Signal
Busy Time
Valid, Invalid
Ready on Power Up, Ready on Select
200 ms, 1 sec.
* Appears only when the optional Serial Interface is installed.
Mode Menu 33
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Menu Settings Table (Continued)
Group
Item
Settings (Defaults are set in bold italic)
CSF Bin 1*
Line Spacing
6 LPI, 8 LPI
Bottom Margin
Page Width (Wide model)
Page Length
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
6 LPI, 8 LPI
Bottom Margin
Page Length
Valid, Invalid
11", 11-2/3", 12", 14", 17", 5", 3.5", 4", 5.5", 6", 7", 8", 8.5"
* Appears only when the optional Cut Sheet Feeder is installed.
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Auto Feed XT, Default = Invalid
Explanations of Menu Items
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.
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.
7 or 8 Bit Graphics, Default = 7
Change this setting to 8 if your system uses 8-bit graphics.
Auto Select, Default = No
7 or 8 Bit Data Word, Default = 8
Change this setting to 7 if your system uses 7-bit data word
lengths.
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.
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.
Baud Rate, Default = 9600 bps
Appears only if optional Serial Interface is installed. Set this to
match your system’s transmission speed.
Auto LF, Default = No
If your printout is consistently double spaced, select No; if it
overprints, select Yes.
Bi-direction, Default = Enable
Change this setting if you wish to disable bidirectional
transmission (PnP) in Nibble mode.
Mode Menu 35
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Bottom Margin, Default = Valid
Centering Position, Default = DEFAULT
Change to Invalid if you want the printer to ignore the bottom
margin setting.
Used to limit printhead travel when printing narrow columns.
• Select Mode 1 for the narrow carriage printer.
CAUTION!!
• Select Mode 1 or Mode 2 for the wide carriage printer.
Setting the Bottom Margin to Invalid can cause loss of data
and damage the printhead by allowing printing without paper.
Character Set, Default = IBM Set I
Epson and IBM emulations only. Use this to switch character
sets to IBM Set II
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:
Character Set, Default = Standard
MICROLINE emulation only. Use this to switch the character
set to Line Graphics.
• SSD -9V, select SSD-
• SSD +9V, select SSD+
• DTR -9V, select DTR
• RTS -9V, select RTS
Code Page, Default = USA
Choose the Code Page character set you wish to use: USA,
Canada French, Multilingual, Portugal, Norway, BRASCII,
Abicomp, Multilingual 858, or ISO 8859-15.
CSF Bin Select, Default = Bin 1
Busy Time, Default = 200 ms
Appears only when the optional Dual-Bin Cut Sheet Feeder is
installed. Use this to switch to Bin 2 as the default.
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,
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CSF Type, Default = Wide
Emulation Mode, Default = IBM PPR
Selects the printer command set (emulation) you want to
engage.
To avoid paper jams, change this setting to Narrow if you are
using the optional Cut Sheet Feeder on the wide model ML421
printer.
ESC SI Pitch, Default = 17 cpi
Sets the character pitch used when the ESC SI command is
received.
Diagnostic Test, Default = No
Appears only when the optional Serial Interface is installed.
Select yes to perform a diagnostic test of the serial interface.
Form Tear-Off, Default = Off
DRAFT Mode, Default = HSD
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.
Applies only when the Print Mode is set to DRAFT. Selects the
draft mode to be used: HSD (High Speed Draft) or SSD (Super
Speed Draft).
Graphics, Default = Bi-directional
Change to uni-directional graphics for better registration, but
slower printing. With this set for bi-directional, you can
optimize the registration using the Print Registration setting in
the Menu.
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.
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).
Mode Menu 37
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I-Prime, Default = Buffer Print
Determines what the printer will do when it receives the
I-Prime signal from the software.
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.
• Buffer Print: prints out the buffer contents before resetting.
• Buffer Clear: dumps the buffer contents immediately.
• Invalid: 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.
Importa nt!
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.
Language Set, Default = American
Replaces certain standard symbols with special characters used
in foreign languages.
Page Length, Default = 11"
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.
Line Spacing, Default = 6 lpi
Change to 8 lines per inch (lpi) to get more lines on a page.
Page Length Control, Default = by Actual Page Length
If you are printing single sheets no longer than 17 inches and
wish the printer to acknowledge the menu setting for Top Feed
Page Length, change the setting to “by Menu Setting.”
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Page Width, Default = Depends on Feed Path
Parity, Default = None
Wide carriage model only.
Appears only when the optional Serial Interface is installed.
Selects the type of parity your system uses: None, Odd or
Even.
For rear and bottom paths, the default is 13.6". Change to 8" if
you will be printing on narrow paper. This prevents printing on
the platen which can damage the printhead and the platen, and
can cause loss of data.
Pin 18, Default = +5V
Sets the signal on pin 18 to +5 volts or open.
For the top feed path the default is 8". Change to 13.6" to print
on wide paper.
Pitch, Default = 10 cpi
Choose the character width, in characters per inch (cpi).
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.
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.
Ca ution!!
Engaging Paper Out Override can cause loss of data and
damage the printhead by allowing printing without paper.
Power Saving, Default = Enable
Change to Disable if you wish to prevent the printer from
entering the Power Save mode after the selected interval.
Mode Menu 39
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Print Mode, Default = Utility
Receive Buffer Size, Default = 64K
Choose the quality and typeface of printing. Switch to NLQ
Courier or NLQ Gothic for Near Letter Quality printing. If you
are printing draft-type documents, select DRAFT, then select
either HSD or SSD under DRAFT Mode. Both of these Items
are in the Font Group.
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.
Print Registration, Default = 0
Change the setting as required to obtain the best registration for
bi-directional printing.
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.
Note: This will also prevent your software from clearing out
existing settings when you finish printing one document
and switch to another.
Proportional Spacing, Default = No
Change the setting to Yes to engage proportional spacing of
characters.
Serial Data 7/ 8 Bits, Default = 8 Bits
Appears only if the optional Serial Interface is installed.
Change to 7 Bits if you systems uses a 7-bit data format.
Protocol, Default = Ready/ Busy
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.
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.
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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.
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 = Slashed
If you do not want the printer to use a slash to distinguish the
number zero from the capital letter O, change the setting to
Unslashed.
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.
Mode Menu 41
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Chapter 5: Maintenance
1 Make sure the printer is turned OFF.
Replacing the Ribbon Cartridge
Important!
2 Open the access cover and center the printhead.
Make sure you have the correct replacement ribbon for the
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
• Leave unused ribbon cartridges in their packages until
needed.
• Careful; the ribbon ink may cause permanent stains.
• Ribbon ink on skin or clothing can usually be removed
with soap and water.
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CAUTION!
5 Turn the take-up knob (1) in the direction of the arrow to
take up any ribbon slack.
The printhead may be HOT!
3 Swing the used ribbon cartridge up off the printhead, lift it
out, and discard it.
6 Close the access cover and turn the printer back on.
CAUTION!
If ribbon should contact the eyes:
Flush eyes with large quantities of water for 15 minutes,
keeping eyelids open with fingers. Seek medical attention.
4 Unpack the new ribbon cartridge and install it.
Importa nt!
If ribbon should contact the skin
Do not remove the ribbon shield (1) from the ribbon!
Wash thoroughly with soap and water.
For more information
See the Material Safety Data Sheet in your Warranty,
Regulatory, and Safety Information booklet.
Maintenance 43
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Loading Rear Feed Paper from the Ba ck of the Printer
Loading Paper
Note: These instructions assume you have ready access to the
back of the printer. If you do not, skip down to “Loading
Rear Feed Paper from the Front of the Printer.”
Rear Feed
Note: If you have any paper in the paper path, remove it
before installing rear feed paper.
1 Make sure the paper lever is forward (position marked
“REAR”).
Lock Lever
Upper Tractor Cover
Pins
2 Open the access cover (1).
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3 Grasp the sheet guide. Lift it slightly, then slide it back.
4 Pivot the sheet guide forward and gently rest it against the
roller assembly.
Ca reful!
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.
Maintenance 45
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5 From the back of the printer, locate the tractors (1).
6 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:
ML421
ML420
Note: The movement of the right tractor is limited to ensure
that the paper covers the paper sensor.
7 Open the tractor covers.
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8 Place continuous forms paper on the first two pins of either
10 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.
tractor.
Importa nt!
Note: If the paper is too loose or too tight it can cause jams.
You must keep the number of paper holes engaged on either
pin the same. If you don’t the paper will skew and jam.
9 Close the right tractor cover.
Maintenance 47
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11 Lower the sheet guide and slide it toward the front of the
12 Place the wire guide (“1” in the illustration for the step
printer until the marks align.
above) in the sheet guide on the pull-up roller assembly.
13 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 Chapter 3.
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Loading Rear Feed Paper from the Front of the Printer
2 Open the access cover (1).
Note: 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.
Lock Lever
Upper Tractor Cover
Pins
3 Grasp the tabs and lift off the sheet guide.
1 Make sure the paper lever is forward (position marked
“REAR”).
4 Pull up on the lock levers to release them.
Maintenance 49
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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.
7 Open the tractor covers and place continuous forms paper on
the first two pins of either tractor, then close the left tractor
cover.
5 You will find reference marks (1 in illustration below) on the
Importa nt!
printer for the two most common paper sizes:
You must keep the number of paper holes engaged on either
pin the same. If you don’t the paper will skew and jam.
ML420:
ML421:
6 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.
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8 Adjust the position of the right tractor to center the holes in
the paper on the pins. Then, close its tractor cover and push
back the lock lever. Do not stretch the paper.
9 Reinstall the sheet guide.
Note: If the paper is too loose or too tight it can cause jams.
Maintenance 51
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10 Place the wire guide (1) in the sheet guide on the pull-up
11 Press FF/LOAD.
roller assembly.
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 Chapter 3.
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3 Open the acoustic cover (1) and raise the sheet guide to the
single-sheet position. Pivot the wire feed guide (2) up into
the sheet guide.
Top Feed (Single Sheets)
Note: If you have continuous form paper in the path, press
PARK to remove it before loading single sheets.
1 Make sure the printer is on and deselected (SEL light off).
2 Place the paper lever in the center position (marked “TOP”).
Maintenance 53
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4 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.
Importa nt!
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.
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 Chapter 3.
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5 Lift the sheet guide (1) and reload paper. Make sure you
Clearing Paper Jams
lock the tractor covers.
Rear-Feed Paper Jams
1 Turn off the printer.
2 Use the platen knob to back the paper all the way out of the
printer.
CAUTION!
Make sure the printer is turned off before you open the access
cover.
5 Lower the sheet guide, then install the pull-up roller
3 Open the access cover (1) and remove the pull-up roller
assembly and close the access cover.
assembly (2). Remove any torn pieces of paper.
6 Turn on the printer and press FF/LOAD.
Maintenance 55
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Bits of Paper Stuck in the Paper Path
Rear-Feed, Repeating Paper Jams
If the paper keeps jamming, you may have:
1 Turn off the printer.
2 Use the platen knob to back the paper all the way out of the
• defective paper
printer.
• misaligned paper
CAUTION!
• bits of paper stuck in the paper path
Make sure the printer is turned off before you open the access
cover.
Defective Paper
Replace the paper with a fresh stack.
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.
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.
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4 Remove any torn pieces of paper.
8 Load regular paper, close and lock the tractor covers.
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.
9 Install the sheet guide, then install the pull-up roller
assembly and close the access cover.
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.
10 Turn the printer on and press FF/LOAD.
Maintenance 57
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3 Open the access cover (1) and remove the pull-up roller
Single-Sheet Paper Jams
1 Turn off the printer.
assembly (2).
2 Use the platen knob to back the paper out.
4 Remove any torn pieces from around the carriage.
5 Reinstall the pull-up roller assembly and close the access
cover.
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4 Use a clean, dry cloth to dust around the carriage shaft and
Cleaning the Housing
You should clean the printer housing every six months (or after
about 300 hours of operation).
platen. Remove any loose bits of paper.
5 Reinstall the pull-up roller assembly and close the access
cover.
CAUTION!
Never use strong solvents or strong detergents on the
cabinet—they could damage the housing.
1 Turn off the printer.
2 Use the platen knob to back the paper out of the printer.
CAUTION!
Make sure the printer is turned off before you open the access
cover.
3 Open the access cover (1) and remove the pull-up roller
assembly (2).
Maintenance 59
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Chapter 6: Troubleshooting
Note: Settings in your software application will normally
General Information
override any settings in your printer driver.
Here are some general things to check before proceeding with
detailed troubleshooting.
Printer driver settings normally override settings from
the printer menu or printer front panel.
• Is the printer plugged in and turned on?
• Are the connections (power and interface) secure?
• Is the product being operated under the proper ambient
conditions?
• Does the paper being used meet the specifications for this
product?
• Is the paper properly installed?
• Is the ribbon properly installed?
• Is an Oki ribbon being used?
• Is the printhead gap correctly set?
• Are the correct printer drivers being used for the printer?
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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.
Problems / Solutions
Problem
My word processor files do not print the way I have the menu
and front panel set.
For more information on changing menu settings, see
“Changing the Menu Settings” in Chapter 4.
Solution
Remember:
Problem
Nothing happens when I turn on the printer.
• Settings in your software application can override settings in
your printer driver.
Solution
• Your printer driver settings can override any settings from the
printer menu or printer front panel.
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.
Before sending a file to the printer, many word processors send
either an “initialization string” or an I-Prime signal to the
printer.
The initialization 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.
Troubleshooting 61
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Problem
Problem
The printer does not print when the computer sends data.
I'm getting strange symbols, incorrect fonts, etc., when I try to
print a document.
Solutions
Solutions
1 Is the SEL light on? If not, press the SEL key.
1 Check to be sure that the printer driver you have selected in
your software matches the printer emulation.
2 Check that the interface cable is securely connected to both
the printer and the computer.
• Press SHIFT and SEL keys, then press GROUP key.
3 If you have the optional serial interface board installed,
check to be sure that it is firmly seated in the printer.
• This will print a line showing the emulation you have
selected.
2 If you have embedded any printer commands in your
software, check to be sure that you entered them correctly.
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Problem
Problem
Ink smears on the paper when I print narrow columns.
I've installed a new ribbon and the printing is smeared and
streaked.
Solution
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.”
The ribbon shield (1) is either loose or missing.
For the wide-carriage printer, if MODE 1 doesn't work, try
setting the Centering Position to MODE 2.
Remove the ribbon cartridge and check the ribbon shield.
• If it is loose, secure it.
• If it is missing, find it and install it.
Troubleshooting 63
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Problem
Problem
There are dots missing in my printouts.
The ALARM light is on and the Character Pitch 10 light is
flashing.
Solution
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.
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
Problem
The ALARM light is flashing.
The ALARM light is on and the Character Pitch 15 light is
flashing.
Solution
Try turning the printer off and then back on again. If the light
still blinks, call for service.
Solution
This indicates a paper jam. Press the SEL key and correct the
paper jam situation. See “Clearing Paper Jams,” in Chapter 4.
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Problem
Problem
The printer needs paper. The ALARM is not on and I can’t load
paper.
The Print Quality and Character Pitch keys on the front panel
don't work.
Solution
Solution
1 Press and release the SEL key.
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.
2 Press and hold the SHIFT key and press the RESET /
CHARACTER PITCH key.
The ALARM light comes on and you can now load paper.
Check with your system manager before changing any menu
settings.
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.
Troubleshooting 65
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Appendix A: Parts & Accessories
• In the United States, purchase directly from Oki Data
- Via the Internet
Purchasing Parts & Accessories
Before you purchase, know your printer model number (see the
front of the unit) and have the correct part number and
description of the item. Item descriptions and part numbers are
provided in this section.
http:/ / my.okidata.com
- Via telephone
• Consult the dealer where your purchased your printer.
Order toll-free by phone at 1-800-654-3282
(1-800-OKI-DATA) using VISA®, MasterCard®, or
AmEx®.
• Locate an Authorized Oki Data Reseller by visiting one of
our web sites
http:/ / my.okidata.com (allows you to register your
• In Canada, call 888-309-4570.
product and personalize your own support needs)
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Item
Part Number
Replacement Parts
Both Models
Ribbon Cartridge ( )------------------------------- 42377801
Platen Knob ( )------------------------------------- 51902220
Power Cord ( ) ------------------------------------- 56631801
Printhead ( ) ---------------------------------------- 41923901
Model ML420
Access Cover ( ) ----------------------------------- 42115401
Sheet Guide ( ) ------------------------------------- 51009509
Pull-Up Roller Assembly ( ) --------------------- 42044701
Model ML421
Access Cover ( ) ----------------------------------- 42115301
Sheet Guide ( ) ------------------------------------- 51009410
Pull-Up Roller Assembly ( ) --------------------- 42045701
Accessories 67
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Accessories
Option
Part Number
Model ML420
Pull Tractor, Top-Mount ( )---------------------- 70030501
Push Tractor, Bottom-Mount ( ) ---------------- 70030701
Roll Paper Stand ( ) ------------------------------- 70023301
Model ML421
Pull Tractor, Top-Mount ( )---------------------- 70030601
Push Tractor, Bottom-Mount ( ) ---------------- 70030801
Both Models
Cut Sheet Feeder ( ) ------------------------------- 70030101
Serial Interface ( ) --------------------------------- 70012801
OkiLAN® 6120i 10/100 Base-T Ethernet
Internal Print Server (not shown) --------------- 70046501
OkiLAN 6020e 10/100 Base-T Ethernet
External Print Server (not shown)--------------- 70036001
OkiLAN 6010 10 Base-T Ethernet
External Print Server (not shown)--------------- 70034401
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Appendix B: Printer Control Codes
This section lists the most commonly used printer control
codes.
IBM Proprinter III Commands
You will find a comprehensive listing of the control codes
(English only), on your Printer CD.
IBM Command
Backspace
ASCII
BS
Decimal
8
To access it:
Carriage Return
CR
13
1 Place the CD in your CD-ROM drive and wait for it to
AutoPlay.
Character Pitch
Select 10 cpi
Select 12 cpi
Select 15 cpi
2 Select your printer model, then click Continue.
DC2
18
3 Click Documentation and follow the on-screen prompts to
ESC :
ESC g
27 58
27 103
view the file.
Select Condensed Print ESC SI, or SI 27 15, or 15
Character Sets
IBM Set I
ESC 7
27 55
IBM Set II
Publisher
ESC 6
27 54
ESC ! Z
ESC ! @
ESC ! A
27 33 90
27 33 64
27 33 65
Slashed Zero
Unslashed Zero
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IBM Proprinter III Commands
(continued)
IBM Command
ASCII
Decimal
Line Feed, Execute
w/ Carriage Return
n/144" (n = 1 to 127)
n/216" (n = 0 to 255)
Reverse
LF
10
IBM Command
ASCII
Decimal
ESC % 5 n
ESC J n
ESC ]
27 37 53 n
27 74 n
27 93
Double Width On
Double Width Off
ESC W 1
ESC W 0
27 87 49
27 87 48
Auto Line Feed On
Auto Line Feed Off
ESC 5 1
ESC 5 0
27 53 49
27 53 48
Emphasized Printing On
ESC E
27 69
27 70
Emphasized Printing Off ESC F
Line Spacing
Enhanced Printing On
Enhanced Printing Off
ESC G
ESC H
27 71
27 72
Set Spacing to 1/8"
Set Spacing to 7/72"
ESC 0
ESC 1
27 48
27 49
Form Feed
FF
12
Set Spacing to n/72"
(n = 0 to 255)
ESC A n
ESC 2
27 65 n
27 50
Form Length
Store Spacing Set
by ESC A n
n inches (n = 1 to 255)
n lines (n = 1 to 255)
ESC C NUL n 27 67 0 n
ESC C n
27 67 n
Set Spacing to n/144"
(n = 1 to 127)
Horizontal Tab, Execute
HT
9
ESC % 9 n
ESC 3 n
27 37 57 n
27 51 n
Italics On
Italics Off
ESC % G
ESC % H
27 37 71
27 37 72
Set Spacing to n/216"
(n = 0 to 255)
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IBM Proprinter III Commands
(continued)
IBM Command
Software I-Prime
Stop Printing
ASCII
Decimal
ESC } NUL 27 125 0
ESC j
27 106
IBM Command
ASCII
Decimal
Subscript On
ESC S 1
ESC S 0
27 83 49
27 83 48
27 84
Overscore On
Overscore Off
ESC _ 1
ESC _ 0
27 95 49
27 95 48
Superscript On
Subscript/Superscript Off ESC T
Paper Out Sensor Off
Paper Out Sensor On
ESC 8
ESC 9
27 56
27 57
Top of Form,
Set at Current Position
ESC 4
27 52
Print Quality, Select HSD ESC # 0
27 35 48
Underline Printing On
Underline Printing Off
ESC - 1
ESC - 0
27 45 49
27 45 48
Print Suppress Mode On
ML420
ML421
ESC Q ETX 27 81 3
ESC Q SYN 27 81 22
Uni-Directional Print On ESC U 1
Uni-Directional Print Off ESC U 0
27 85 49
27 85 48
Print Suppress Mode Off DC1
17
Vertical Tab, Execute
VT
11
Proportional Spacing On ESC P 1
Proportional Spacing Off ESC P 0
27 80 49
27 80 48
Reset: Clear Print Buffer CAN
24
Control Codes 71
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Epson FX Commands
Epson Command
ASCII
Decimal
Double Height On
Double Height Off
ESC w 1
ESC w 0
27 119 49
27 119 48
Epson Command
ASCII
Decimal
Backspace
BS
8
Double Width On
Double Width Off
ESC W 1
ESC W 0
27 87 49
27 87 48
Carriage Return,
Execute
CR
13
Emphasized Print On
Emphasized Print Off
ESC E
ESC F
27 69
27 70
Character Pitch
Select 10 cpi
Select 12 cpi
Select 15 cpi
Begin 10 cpi
ESC P
ESC M
ESC g
27 80
27 77
27 103
Enhanced Print On
Enhanced Print Off
ESC G
ESC H
27 71
27 72
Epson Set 1, Select
Epson Set 2, Select
ESC t 0
ESC t 1
27 116 48
27 116 49
ESC SI, or SI 27 15, or 15
Cancel Condensed Print
Delete
DC2
DEL
18
Italic Printing On
Italic Printing Off
ESC 4
ESC 5
27 52
27 53
127
Form Feed
FF
12
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Epson FX Commands (continued)
Epson Command
ASCII
Decimal
Line Spacing, Set
Epson Command
ASCII
Decimal
n/144" (n = 0 to 127)
n/216" (n = 0 to 255)
ESC % 9 n
ESC 3 n
27 37 57 n
27 51 n
Form Length
n Inches (n = 1 to 22)
n Lines (n = 1 to 127)
ESC C NUL n 27 67 0 n
n/72"
ESC A n
27 65 n
(n = 0-85 or 128-213)
ESC C n
27 67 n
1/6"
1/8"
7/72"
ESC 2
ESC 0
ESC 1
27 50
Horizontal Tab
HT
9
27 48
Justification
Left
27 49 n
ESC a 0
ESC a 1
ESC a 2
ESC a 3
27 97 48
27 97 49
27 97 50
27 97 51
Paper Out Sensor Off
Paper Out Sensor On
ESC 8
ESC 9
27 56
27 57
Center
Right
Full
Line Feed, Execute
Select 10 cpi
ESC P
ESC M
LF
27 80
Select 12 cpi
27 77
w/ Carriage Return
n/216" (n = 0 to 255)
n/144" (n = 0 to 127)
10
ESC J n
ESC % 5 n
27 74 n
27 37 53 n
Reverse, n/216"
(n = 0 to 255)
ESC j n
27 106 n
Control Codes 73
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Epson FX Commands (continued)
Epson Command
ASCII
Decimal
Reset Printer
Epson Command
ASCII
Decimal
Clear Buffer & Initialize ESC @
27 64
24
Print Quality/Font
Clear Print Buffer
CAN
Select HSD/SSD
(depends on setting
for Draft Mode)
Skip Over Perforation,
Cancel
ESC O
27 79
ESC ( 0
ESC x 1
27 40 48
Software I-Prime
ESC } NUL
27 125 0
Select NLQ
27 120 49
Select Courier
(NLQ only)
Subscript On
ESC S 1
ESC S 0
27 83 49
27 83 48
27 84
ESC k 0
27 107 48
Superscript On
Select Gothic
(NLQ only)
Subscript/Superscript Off ESC T
ESC k 1
ESC x 0
27 107 49
27 120 48
Underline On
Underline Off
ESC - 1
ESC - 0
27 45 49
27 45 48
Select UTL
Print Speed
Uni-Directional Printing
Half-Speed On
Half-Speed Off
ESC s 1
ESC s 0
27 115 49
27 115 48
One Line Only
ESC <
27 60
On
ESC U 1
ESC U 0
27 85 49
27 85 48
Print Suppress Mode On
DC3
19
17
Off
Print Suppress Mode Off DC1
Vertical Tab, Execute
VT
11
Proportional Spacing On ESC p 1
Proportional Spacing Off ESC p 0
27 112 49
27 112 48
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Oki MICROLINE Standard
Commands
Oki Command
ASCII
Decimal
Slashed Zero
ESC ! @
ESC ! A
27 33 64
27 33 65
Unslashed Zero
Oki Command
Backspace
ASCII
BS
Decimal
Double Height On
Double Height Off
ESC US 1
ESC US 0
27 31 49
27 31 48
8
Carriage Return
CR
13
Double Width Printing
US
31
Character Pitch
Select 10 cpi
Select 12 cpi
Select 15 cpi
Select 17.1 cpi
Select 20 cpi
Emphasized Printing On
ESC T
27 84
27 73
RS
30
Emphasized Printing Off ESC I
FS
28
Enhanced Printing On
Enhanced Printing Off
ESC H
ESC I
27 72
27 73
ESC g
GS
27 103
29
Form Feed
FF
12
9
ESC # 3
27 35 51
Horizontal Tab, Execute
HT
Character Sets
Standard
Italic On
Italic Off
ESC ! /
ESC ! *
27 33 47
27 33 42
ESC ! 0
ESC ! 1
ESC ! 2
ESC ! Z
27 33 48
27 33 49
27 33 50
27 33 90
Block Graphic
Line Graphics
Publisher
Control Codes 75
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Oki MICROLINE Standard
Commands (continued)
Oki Command
ASCII
Decimal
Paper Out Sensor Off
Paper Out Sensor On
ESC E 1
ESC E 0
27 69 49
27 69 48
Oki Command
ASCII
Decimal
Print Quality
Line Feed Commands
w/ Carriage Return
w/o Carriage Return
n/144" (n = 0 to 127)
Reverse
Select HSD/SSD
Select NLQ Courier
Select NLQ Gothic
Select Utility
ESC # 0
ESC 1
ESC 3
ESC 0
27 35 48
27 49
LF
10
ESC DC2
ESC % 5 n
ESC LF
27 18
27 37 53 n
27 10
27 51
27 48
Print Speed, Set to Full
Print Speed, Set to Half
ESC >
ESC <
27 62
27 60
Line Spacing
Set Spacing to 1/6"
Set Spacing to 1/8"
ESC 6
ESC 8
27 54
27 56
Print Suppress On
Print Suppress Off
DC3
DC1
19
17
Set Spacing, in n/144"
(n = 0 to 127)
Proportional Printing
ESC % 9 n
27 37 57 n
On
ESC Y
ESC Z
27 89
27 90
Skip Over Perforation
Off
1/3" increments
(n = 1 to 9)
Reset: Clear Print Buffer CAN
24
ESC G n n
ESC % S 0
27 71 n n
Default
27 37 83 48
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Oki MICROLINE Standard
Commands (continued)
Oki Command
ASCII
Decimal
Shift-In
SI
15
14
Shift-Out
SO
Software I-Prime
ESC } NUL
27 125 0
Subscript Printing On
Subscript Printing Off
Superscript Printing On
Superscript Printing Off
ESC L
ESC M
ESC J
27 76
27 77
27 74
27 75
ESC K
Underline Printing On
Underline Printing Off
ESC C
ESC D
27 67
27 68
Uni-Directional Print On ESC -
Uni-Directional Print Off ESC =
27 45
27 61
Vertical Tab, Execute
VT
11
Control Codes 77
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Appendix C: Specifications
Note: Specifications are subject to change without notice.
Receive Buffer Size
Maximum 128K
Print Method
Impact dot matrix
Reliability
Ribbon Life
4 million characters, on average, 10 cpi utility
Printhead Life
400 million characters average in 10 cpi utility mode at
Printhead
9 pins, 0.30 mm (0.0118") diameter, with thermal
protection
Interfaces
25% duty and 35% page density
Standard: Centronics parallel, IEEE-1284 compliant
Mean Time Between Failures (MTBF)
USB 1.1
20,000 hours at 25% duty cycle and 35% page density
Optional: RS-232C Serial
Ethernet Print Servers:
Mean Time to Repair (MTTR)
15 minutes
6120i 10/100 Base-T, Internal
6020e 10/100 Base-T, External
6010e 10 Base-T, External
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Emulations (co-resident)
• IBM Proprinter III
Characters per Line (cpl)
Setting
10 cpi
12 cpi
15 cpi
17.1 cpi
20 cpi
ML420
ML421
136 cpl
163 cpl
204 cpl
233 cpl
272 cpl
• Epson FX
• Oki MICROLINE Standard
80 cpl
96 cpl
Print Speed
120 cpl
137 cpl
160 cpl
Speed
(Characters per Second)
Mode
Super Speed Draft (SSD)
High Speed Draft (HSD)
Utility
570 cps
507 cps
380 cps
95 cps
Near Letter Quality (NLQ)
Specifications 79
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Graphics Resolution
Bar Codes
• Code 39
Max. Resolution
(Dots per inch)
• UPC A, UPC E
• EAN 8, EAN 13
• Interleaved 2 of 5
• Code 128
Emulation
Density
IBM, Epson
Single
60 x 216 dpi
120 x 216 dpi
240 x 216 dpi
Double
Quadruple
• Postnet
Oki MICROLINE Single
Double
72 x 72 dpi
144 x 144 dpi
288 x 144 dpi
Paper Thickness: Tractor Feed
Quadruple
Rear Feed: 0.014" (0.36 mm) maximum
Bottom Feed: 0.017" (0.44 mm) max.
Requires optional push or pull tractor.
Resident Fonts
Print Quality
Near Letter Quality
Utility
Available Fonts
Courier, Gothic
Gothic
High Speed Draft
Super Speed Draft
Gothic
Gothic
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Paper Specifications: ML420
Labels
Feed: Bottom* Only
Weight: Not applicable
Width Range: 3" to 10" (76 to 254 mm)
Single (Cut) Sheets
Feed: Top Only
Weight: 14 to 24 lb. US Bond (52.6 to 90 g/m2)
Width Range: 7.2" to 8.5" (183 to 216 mm)
Envelopes, single feed
Feed: Top Only
Weight: Max. 24 lb.
Width Range: 6.5" to 9.5" (165 to 241 mm)
Single-part, continuous forms
Feed: Rear, Bottom*
Weight: 12 to 24 lb. US Bond (45 to 90 g/m2)
Width Range: 3" to 10" (76 to 254 mm)
Envelopes, continuous feed, non-overlap type
Feed: Bottom* Only
Weight: Max. 24 lb.
Width Range: 6.5" to 9.5" (165 to 241 mm)
Carbonless continuous forms (orig. + 4 copies)
Feed: Rear, Bottom*
Weight: 9 to 11 lb.
Card Stock
Width Range: 3" to 10" (76 to 254 mm)
Feed: Bottom*
Weight: Max. 100 lb. Index (180 g/m2)
Width Range: Not applicable
Interleaf continuous forms (orig. + 4 copies)
Feed: Rear, Bottom*
Weight: 10 to 12 lb. paper, 9 lb carbon
Width Range: 3 to 10" (76 to 254 mm)
* Bottom feed requires optional pull or push tractor
Specifications 81
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Paper Specifications: ML421
Labels
Feed: Bottom* Only
Weight: Not applicable
Width Range: 3" to 16" (76.2 to 406.4 mm)
Single (Cut) Sheet
Feed: Top Only
Weight: 14 to 24 lb. US Bond (52.6 to 90 g/m2)
Width Range: 7.2" to 14.3" (182.8 to 363.2 mm)
Envelopes, single feed
Feed: Top Only
Weight: Max. 24 lb.
Width Range: 6.5" to 9.5" (165.1 to 241.3 mm)
Single-part, continuous forms
Feed: Rear, Bottom*
Weight: 12 to 24 lb. US Bond (45 to 90 g/m2)
Width Range: 3" to 16" (76.2 to 406.4 mm)
Envelopes, continuous feed, non-overlap
Feed: Bottom* Only
Weight: Max. 24 lb.
Width Range: 6.5" to 9.5" (165.1 to 241.3 mm)
Carbonless continuous forms
Feed: Rear, Bottom*
Weight: 9 to 11 lb.
Card stock
Width Range: 3" to 16" (76.2 to 406.4 mm)
Feed: Bottom* Only
Weight: Max. 100 lb. Index (180 g/m2)
Width Range: Not applicable
Interleaf continuous forms
Feed: Rear, Bottom*
Weight: 10 to 12 lb. paper, 9 lb. carbon
Width Range: 3" to 16" (76.2 to 406.4 mm)
* Bottom feed requires optional pull or push tractor
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Environmental Requirements
Physical Specifications
Temperature
Note: Height dimensions do not include the acoustic cover.
Operating: 41 to 95°F (5 to 36°C)
Storage: 14 to 122°F (-10 to 50°C)
ML420
Size (WxDxH): 17.1" x 16.1" x 6"
(434 x 409 x 153 mm)
Humidity
Operating: 20 to 80% RH
Storage: 5 to 95% RH
Weight: 16.7 lbs. (7.6 kg)
ML421
Size (WxDxH): 23.1" x 16.1" x 6"
(588 x 409 x 153 mm)
Electrical Requirements
• 120 volts ac, (+6%, -15%)
Weight: 21.1 lbs. (9.6 kg)
50 or 60 Hz (±2%)
58 W Typical, 10 W idle
• 230 ac, (+15%, -14 %)
50 or 60 Hz (±2%)
58 W Typical, 10 W idle
Specifications 83
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Appendix D: Installation
Printer
Location
Ribbon Cartridge
Power Cord
• Place your printer on a firm, solid surface.
• Allow enough space around the printer to easily access the
platen knob and the various paper feed paths.
• Make sure a suitable grounded power outlet is available
nearby.
Unpack
• If any items are missing, contact your dealer immediately.
• Keep your packing materials and carton in case you ever
need to ship or transport the printer.
• Interface cable and paper are sold separately.
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1 Remove any packing tape, then grasp the tabs (1) at either
end of the access cover and pivot it toward the front of the
printer as far as it will go.
3 Remove the shipping restraint from the pull-up roller
assembly (1).
2 Remove the printhead shipping restraint.
Installation 85
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4 Use the tabs (1) to lift and remove the sheet guide, then
5 Reinstall the sheet guide: insert the clips on either side of the
separator into the notches marked with a triangle, then press
down to secure the separator in place.
remove the shipping restraint.
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CAUTION! The printhea d ma y be HOT!
3 Unpack the new ribbon cartridge and install it on the
printhead.
Install 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.
Importa nt!
Do not remove the ribbon shield (1) from the ribbon!
Ribbon Cartridge Handling
• Leave unused ribbon cartridges in their packages until
needed.
• Careful; the ribbon ink may cause permanent stains.
• Ribbon ink on skin or clothing can usually be removed with
soap and water.
1 Make sure the printer is turned OFF.
2 Open the access cover and center the printhead (1).
4 Turn the take-up knob (1) in the direction of the molded-in
arrow to take up any ribbon slack.
5 Close the access cover and turn the printer on.
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Power Connection
Computer Connections
1 Make sure both the printer and the computer are OFF.
Parallel (LPT): IEEE 1284
• Requires bidirectional cable, max. length 6 ft. (1.8 m), not
supplied.
2 Plug the power cord into the back of the printer, then into a
grounded outlet.
• Printer has 36-pin socket
1 Make sure the printer and computer are both turned off.
2 Attach a suitable bidirectional cable to the parallel connector
on the back of the printer. Then attach and secure the cable
to your computer.
3 Turn on the printer.
3 Turn the printer and computer back on.
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USB: Specification 1.1 Compliant
• Requires USB 1.1 cable, maximum length 19.7 ft. (5 m), not
supplied.
Loading Paper
For instructions on loading paper, see “Loading Paper” in
Chapter 5.
• Printer has USB “B” receptacle.
1 Make sure the printer and computer are both turned off.
2 Attach a suitable USB cable to the printer. Then attach the
cable to your computer.
3 Turn the computer and printer back on.
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The Font Sample Test prints a sample of the fonts standard to
the printer.
Testing the Printer
• Font Sample Test
The top of the printout shows the Printer Model, Emulation,
Country Code, Interface, and Firmware Revision Level.
• Rolling ASCII Test
• Hexadecimal Dump Mode
1 Make sure paper is loaded.
2 Turn off the printer.
Font Sample Test
3 Press and hold the LF key while turning the printer back on.
The printer prints a page of font samples and the test ends.
Importa nt!
Wide carriage Model ML421: If you are using 8.5" paper to
run the tests, make sure the paper width selection in the
printer menu is set to 8.5 inches. Otherwise, printing on the
platen may damage the printer. See Chapter 4: Menu Mode
for more information.
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The Rolling ASCII Print Test produces a continuous printout of
all 96 ASCII characters in a rolling pattern in whatever
typeface is selected (default = LQ Courier).
Rolling ASCII Test
The top of the printout shows the Printer Model, Emulation,
Country Code, and Firmware Revision Level.
1 Make sure continuous forms paper is loaded.
2 Turn the printer off.
3 Press and hold the QUIET/TOF key while turning the printer
back on. (If the printer comes on without starting the Rolling
ASCII test print, you did not hold the QUIET/TOF key long
enough.)
Important!
The printer prints the rolling ASCII text page after page.
Wide carriage Model ML421: If you are using 8.5" paper to
run the tests, make sure the paper width selection in the
printer menu is set to 8.5 inches. Otherwise, printing on the
platen may damage the printer. See Chapter 4: Menu Mode
for more information.
4 Press SEL to end the test.
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Hexadecimal Dump Mode
Emulations
When the printer is placed in the Hexadecimal Dump Mode, all
data received, including text and printer commands, is printed
in both hexadecimal and ASCII format.
The factory default emulation for your printer is IBM
Proprinter III.
If you wish to change to one of the other emulations, see
“Changing Emulations” in Chapter 3.
For example, the following line of BASIC code
LPRINT CHR$ (27);”0”;CHR$ (30);”This is an
example of a hexadecimal dump.”
Printer Drivers
would print like this:
Note: In the ASCII format, all non-printable characters are
represented by a period.
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.
To engage the Hexadecimal Dump Mode:
1 Make sure paper is loaded.
2 Turn off the printer.
3 Hold the SEL and FF/LOAD keys for several seconds while
turning on the printer.
To exit the Hexadecimal Dump Mode:
• Press the SEL key.
or
• Turn the printer off, then on again.
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Loading the OKI Driver
Using a Compatible Driver
Parallel Interface
Note: See your software documentation for information on how
to select a printer driver.
1 Insert the CD into your CD-ROM drive.
The drivers below are listed by decreasing compatibility with
your printer. Use one as close to the top of the list as possible.
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.
IBM Proprinter III
• IBM Proprinter III
• IBM Proprinter II
• IBM Proprinter
2 Select your printer model.
3 When the Menu Installer window appears, click the Printer
Software button.
4 Follow the on-screen instructions.
Epson FX
USB Interface
• Epson FX286e
• Epson FX 850/1050
• Epson FX 800/1000
1 Turn the printer on.
The Windows Add New Hardware Wizard window displays.
2 Click Next.
3 Insert the CD into your CD-ROM drive.
4 Follow the on-screen instructions to install the software for
your printer model.
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Index
A
C
E
Accessories ............................................. 68
Alignment problems ................................. 9
ASCII Test .............................................. 91
Auto Carriage return............................... 35
Auto LF (Line Feed)........................31, 35
Auto Select ............................................. 32
Carbonless continuous forms ..........81, 82
Card Stock .......................................81, 82
Centering printhead position ..................63
Character Pitch ....................................... 39
Selecting ............................................23
Character Set ...................................28, 36
Character Width......................................39
Characters Per Second (CPS) ................... 7
Code Page Character Set ........................36
Codes, Printer Control ............................ 69
Commands
Epson FX .....................................72–74
IBM Proprinter III .......................69–71
Oki Microline Standard ...............75–77
Control Codes .........................................69
Cut Sheet Feeder.....................................68
Electrical Requirements..........................83
Emulations .......................................24, 92
Mode ..................................................37
Envelopes ........................................81, 82
Environmental Requirements ................. 83
Epson FX Commands.......................72–74
B
Bar Codes ............................................... 80
Bi-directional printing .....................30, 40
Bottom Feed ....................................81, 82
Form Tear-Off .................................... 29
Line Spacing ...................................... 29
Skip Over Perforation ........................ 29
Buffer
Clearing ............................................. 38
Receive Buffer Size ........................... 78
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F
H
L
Factory defaults, menu mode ................. 26
Font Sample Test .................................... 90
Fonts
Height, Double Height Printing..............41
Hex Dump Mode ....................................92
Humidity .................................................83
Labels ..............................................81, 82
Language ................................................ 28
Length, Page
Embedded Printer Commands ........... 62
Resident ............................................. 80
Selecting ............................................40
Forms Tear-Off ....................................... 37
Changing............................................18
Top of Form ................................12, 17
Wait Time........................................... 41
Front Panel
Rear Feed ...........................................29
Top Feed ............................................30
Limited Operation ......................9, 38, 65
Line Spacing ...........................................38
Bottom Feed ......................................29
Rear Feed ...........................................29
Top Feed ............................................30
I
I-Prime ......................................32, 38, 61
IBM
Character Set......................................36
Proprinter III Commands .............69–71
Initialization string..................................61
Interleaf Continuous Forms ....................82
Interleaf continuous forms...................... 81
Interleaved 2 of 5....................................80
Italics ...............................................28, 41
M
Keys ..................................................... 9
Menu Mode........................................ 25
Margin, Bottom ...............................30, 36
Mean Time Between Failures (MTBF) ..78
Mean Time to Repair (MTTR) ............... 78
Memory, Receive Buffer Size ................ 78
MENU light ............................................25
Menu Mode ............................................25
Changing Settings .............................. 27
Entering ............................................. 26
Exiting ............................................... 26
Front Panel keys ................................25
Printing the Menu Settings ................ 26
Reset to factory defaults ....................26
Settings Table ...............................28–42
G
Graphics
Printing .......................................30, 37
Resolution .......................................... 80
GROUP, Menu Mode ............................. 25
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Paper Park...............................................18
Paper Path, switching .............................19
Parallel Interface.....................................32
I-PRIME Signal ................................. 61
Parts, replacement, purchasing ............... 66
Perforation, skip over ......................29, 41
Pitch, character ................................28, 39
PlatenKnob part number.........................67
Postnet ....................................................80
Power rating.............................................. 3
Print Method ...........................................78
Print Mode .......................................28, 40
Print Registration .............................31, 40
Print Server Option ................................. 68
Print Size ................................................79
Print Speed.........................................7, 79
Print Suppress ..................................31, 40
Printer Control Codes .......................69–77
Printer Drivers, Selecting .................92–93
Printer Parameters ..................................25
Printhead .................................................78
Gap.....................................................21
Proportional Spacing .......................28, 40
Pull Tractor ............................................. 68
Push Tractor ............................................68
O
R
Oki MICROLINE Standard
Rear Feed
Commands.......................................75–77
Operator Panel Function......................... 65
Options ................................................... 66
Continuous Forms.............................. 10
Form Tear-Off .............................29, 30
Jams, Repetitive ................................. 56
Line Spacing ......................................29
Paper Jam ...........................................55
Skip Over Perforation ........................ 29
Receive Buffer Size ................................78
Reliability ............................................... 78
Replacement Parts .................................. 66
Resolution (Graphics)............................. 80
Ribbon Cartridge
Replacement Order No. ..................... 67
Replacing ...........................................42
Ribbon Shield ...........................43, 63, 87
Roll Paper Stand .....................................68
RS-232C Serial Interface........................ 78
P
Page Length
Rear Feed ........................................... 29
Top Feed ............................................30
Page Width.............................................. 39
Bottom Feed ......................................29
Rear Feed ........................................... 29
Setting in the Printer Menu .........30, 39
Top Feed ............................................30
Paper
Cut Sheet............................................68
Single Sheet ....................................... 53
Static ..................................................65
Thickness ........................................... 80
Weight ................................................ 82
Widths ..................................30, 39, 82
Paper Jams ........................................64–66
Paper Lever............................................. 64
Paper Out ................................................ 65
Override ......................................30, 39
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S
T
U
Self Tests................................................. 90
Serial Interface........................................ 68
Serial Interface Option ........................... 62
Server, Print Option ................................68
Sheet Guide ............................................67
Single Sheet
Cut Sheet Feeder Option....................68
Jams ................................................... 58
Loading .............................................. 53
Skip Over Perforation ............................. 29
Software
Embedded commands........................ 62
Matching drivers to emulations ......... 62
Software vs. printer settings ..............61
Specifications ......................................... 78
Standard Character Set ........................... 28
Symbol Sets .....................................28, 38
Temperature Specifications ....................83
Tests
Uni-directional printing, graphics .......... 30
Utility
ASCII Test .........................................91
Font Sample Test ...............................90
Hex Dump..........................................92
Thickness, Paper .....................................80
Time Out ..........................................32, 41
Top Feed ...........................................81–84
Bottom Margin...................................30
Line Spacing ......................................30
Pull Tractor ........................................68
Single Sheet ....................................... 11
Top of Form ............................................35
Forms Tear-Off ......................8, 12, 17
Paper Shield .................................. 9, 12
Reset to factory default ...................... 16
Setting ................................................12
Standard Setting..........................12, 16
Typefaces ................................................28
Selecting ............................................40
Front Panel Light ...............................80
Print Speeds ......................................... 7
Utility Mode Print Quality ................. 22
W
Wait Time ........................................30, 41
Weight, Paper ......................................... 82
Width
Character ............................................39
Double width printing........................ 41
Page
Bottom Feed.................................. 29
Rear Feed ......................................29
Top Feed........................................ 30
Paper ..................................................82
Setting in the Printer Menu ....30, 39
Z
Zero character (slashed, unslashed).28, 41
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