Every effort has been made to ensure that the information in
this document is complete, accurate, and up-to-date. Oki Data
assumes no responsibility for the results of errors beyond its
control. Oki Data also cannot guarantee that changes in
software and equipment made by other manufacturers and
referred to in this guide will not affect the applicability of the
information in it. Mention of software products manufactured
by other companies does not necessarily constitute
endorsement by Oki Data.
Copyright 2003 by Oki Data. All rights reserved.
First Edition, January, 2003
Written and produced by the Oki Data Training and
Publications Department.
Please address any comments on this publication to:
Mailing Address
Oki Data Americas, Inc.
Training & Publications Dept.
2000 Bishops Gate Blvd.
Mt. Laurel, NJ 08054-4620
e-Mail Address: pubs@okidata.com
Web Site: http://www.okidata.com.
ENERGY STAR
®
As an ENERGY STAR Partner, Oki Data has
determined that this product meets the
ENERGY STAR guidelines for energy
efficiency.
Trademark Information
OKI and MICROLINE are registered trademarks of Oki Electric
Industry Company, Ltd.
NERGY STAR is a registered trademark of the United States
E
Environmental Protection Agency
Epson is a registered trademark of Epson America, Inc.
IBM is a registered trademark of International Business Machines
Corp.
Microsoft and Windows are either registered trademarks or trademarks
of Microsoft Corporation in the United States and other countries.
2
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:
• 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.
• 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.
• The printer must be installed near a power outlet which will
remain easily accessible.
• 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.
• 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.
• 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
equipment is plugged into has a rating above 15 amperes.
3
• Unplug the printer before you clean it. Use only a damp
cloth. Do not use liquid or aerosol cleaners.
• To protect your printer from overheating, make sure no
openings on the printer are blocked. Do not put the printer on
or near a heat source, such as a radiator or heat register. If
you put the printer in any kind of enclosure, make sure it is
well ventilated.
• The printhead can get quite hot when it has been printing for
a length of time. Do not touch the printhead until it has had a
chance to cool off.
• Do not use your printer near water. Do not spill liquid of any
kind into it.
• 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.
• 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.
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 printer has been dropped or its cabinet has been
damaged.
– The printer doesn’t function normally when you’re
Loading the OKI Driver ............................................................. 90
Using a Compatible Driver ........................................................ 90
Index .......................................................................... 91
6 Microline 490/491 User’s Guide
Chapter 1: Introduction
Printer Features
• Super reliable, durable operation: 20,000 hours Mean Time
Between Failures (MTBF) at 25% duty cycle and 35% page
density
• Advanced paper handling, with built-in rear push tractor and
zero-tear forms capability.
• Blazing print speeds, in characters per second
(depending on characters per inch selected):
– High Speed Draft Mode: 420 cps (10 cpi)
– Utility Mode: 269 to 472 cps
– Letter Quality Mode: 105 to 220 cps
• This rugged 24-pin printer can meet the needs of harsh and
demanding environments.
Oki Data on the Internet
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.
You may reach Oki Data via the Internet at:
•
www.okidata.com
• my.okidata.com
7
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.
When printing stops, Forms Tear-Off automatically moves the
paper to align the perforation with the tear bar (located under
the access cover), after a time interval which you select through
the menu.
Paper remains in the tear-off position until the printer receives
more data. Then, the paper moves back down for printing.
Note: This feature is normally turned off.
Important!
Forms Tear-Off and the Top of Form settings interact. For
more information, see “Top of Form (TOF) and Forms TearOff” in Chapter 3: Using Your Printer.
8
Saving Time
Internet Support
Oki Data provides support via the Internet:
•
www.okidata.com is the main web site, the gateway to Oki
Data’s products and services.
•
http://my.okidata.com is a powerful area of Oki Data’s web
site designed to help you personalize the information and
service you get from Oki Data.
Paper Park
Your printer’s paper park feature allows you to print a single
sheet (cut-sheet) page without removing continuous feed paper
from the printer.
For more information, see “Paper Park” in Chapter 3: Using
Your Printer.
Operation Tips
Turning the Platen Knob
Top of Form (TOF)
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.
The first line prints at the red line of the plastic paper shield (1)
on the printhead.
For more information, see “Top of Form (TOF)” in Chapter 3.
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.
Controlling Access to the Printer
You can control access to the printer by changing the setting for
the Operator Panel Function in the Menu from Full Operation
(the factory default) to Limited Operation.
When Limited Operation is selected, the
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: Using Your Printer.
PRINT QUALITY and
Helpful Hints 9
Chapter 3: Using Your Printer
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
10
Note: For rear feed, the paper lever must be forward.
Parts Identification: Top Feed
(Single Sheets)
Paper Guides
Sheet Guide
Paper Lever
On-Off Switch
Platen Knob
Control Panel
Acoustic Cover (open)
Note: For single-sheet printing, the paper lever must be in the
middle position.
Using Your Printer 11
Top of Form (TOF)
Important!
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: 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 1/180 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.
Top of Form (TOF) and Forms Tear-Off
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).
12 Microline 490/491 User’s Guide
Determining if Forms Tear-Off is Off or On
There are two ways to determine the status of the Forms
Tear-Off menu setting:
• Print the Menu.
• Use the TEAR key.
To print the Menu:
1 Make sure paper is loaded.
2 Hold
3 Press
4 Look for the Form Tear-Off setting in the paper feed group
SHIFT (2), then press SEL (1) to enter the Menu Mode.
PARK (4) to print the menu.
you are using (Rear Feed, Bottom Feed or Top Feed—Forms
Tear–Off appears in the Top Feed group only if the optional
Roll Paper Stand is installed).
To use the TEAR key:
1 Make sure paper is loaded.
2 Press
TEAR (3).
• If the paper moves up, Forms Tear-off is off.
• If the paper moves down, Forms Tear-off is on.
Using Your Printer 13
Setting Top of Form (TOF):
Forms Tear-Off OFF (Default Setting)
Important!
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: The first line prints at the red line (1) of the plastic
paper shield on the printhead.
With paper loaded and the printer on and selected:
1 Press
SEL | MENU (1) to take the printer off line.
The SEL light goes out.
2 Press and hold
SHIFT (2), 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).
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.
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.
14 Microline 490/491 User’s Guide
Setting Top of Form (TOF):
Forms Tear-Off Set to ON
Important!
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: The first line prints at the red line (1) of the plastic
paper shield on the printhead.
With paper loaded and the printer on and selected:
1 Press
PARK (6) to park the paper.
The SEL light goes off and the red alarm light comes on.
2 Press
3 Press
SHIFT (2) and QUIET/TOF (7) to reset the current TOF.
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).
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).
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.
Note: To reset the Top of Form to the factory default, see the
next page.
Using Your Printer 15
Temporarily Changing the Top of Form
Position
Important
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!
To move the Top of Form position lower for one page only:
1 Press
2 Press
SEL to deselect the printer.
LF to lower the position of the Top of Form.
Resetting Top of Form to the Factory Default
The factory default setting for the Top of Form (where the
printing should begin) is 1" down from the top of the page.
To reset the Top of Form to the factory default:
1 Remove paper from the paper path.
2 Turn the printer off.
3 Press and hold
printer.
4 Reload paper.
PARK + QUIET/TOF while turning on the
16 Microline 490/491 User’s Guide
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).
The Forms Tear-Off feature allows a printed continuous forms
page to be torn off without wasting paper or adjusting the
printer. It can be used for rear feed continuous forms, bottom
feed continuous forms (with the optional push tractor installed)
or for top feed roll paper (with optional roll paper stand
installed).
When the printer is turned on, the paper feeds to the tear-off
position.
When data is received, the paper automatically moves down to
the print position (TOF) and printing begins.
Note: You can also move the paper down to the print position
manually by pressing
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.
TEAR
.
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.
Do not use Forms Tear-Off with labels or multipart
forms!
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.
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).
Using Your Printer 17
Changing the Forms Tear-Off Setting
Note: The default setting for Forms Tear-Off is OFF.
To change the Forms Tear-Off setting:
1 Press
2 Press
3 Press
4 Press SET (5) until the time interval you wish to select
SHIFT (2) + SEL (1).
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,
ITEM (4) repeatedly until Form Tear-Off appears in the
second column:
Rear FeedForm Tear-OffOff
appears in the third column:
Rear FeedForm Tear-Off1 Sec
Manual Forms Tear Off
If you don’t wish to engage the Forms Tear-Off feature, you
can advance
• 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
Important!
Never park labels!
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
retract the continuous form paper from the paper path, then lift
the sheet guide, load the sheet and send the print job.
PARK (6) to
5 Press SHIFT (2) + SEL (1) to exit Menu Mode and save the
setting.
18 Microline 490/491 User’s Guide
Changing Paper Paths
Continuous Forms toÿSingle Sheets
1 Tear off any printed pages, then press PARK.
2 Raise the sheet guide (1) to the single-sheet feed position.
3 Pivot the wire feed guide into the sheet guide.
4 Move the paper lever (1) to the middle position marked
“TOP.”
5 Adjust the paper guides (1) for the size paper you are using,
then place a sheet of paper in the sheet guide.
Using Your Printer 19
Single Sheets toÿContinuous Forms
1 Press FF/LOAD to remove the single-sheet paper.
2 Lower the sheet guide into the continuous-forms position.
3 Swing the wire feed guide over onto the pull-up roller.
4 Move the paper lever to the appropriate position.
• Rear feed:
• Bottom feed:
5 If necessary, load continuous-form paper.
6 Press
FF/LOAD.
20 Microline 490/491 User’s Guide
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.
To adjust the gap, open the access cover and move the blue
lever (1) to the recommended setting from the table.
SettingMedia
1Regular paper
22-part form (with carbon)
33-part form (with carbon)
44-part form (with carbon)
5Envelopes 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
Print Quality
Press PRINT QUALITY (1) to select:
Important!
Front panel settings for print quality and character pitch are
normally overridden by software commands.
LQ: Letter Quality
[LQ light on]
• Highest quality, slowest speed
• Choice of 7 typefaces
Utility
[UTILITY light on]
• Medium quality, medium speed
• Gothic typeface only
HSD: High Speed Draft
[LQ and UTILITY lights both on]
• Lowest quality, highest speed
• Gothic typeface only
22 Microline 490/491 User’s Guide
Typefaces: LQ Mode
Important!
Front panel settings for print quality and typeface are
normally overridden by software commands.
To select the typeface you wish to use, press PRINT QUALITY
(1) until the appropriate front panel lights are on:
TypefaceLights on
CourierLQ and COURIER
GothicLQ and GOTHIC
OratorLQ and ORATOR
PrestigeLQ and PRESTIGE
RomanLQ, COURIER, and GOTHIC
SwissLQ, PRESTIGE and ORATOR
Swiss BoldLQ, COURIER and PRESTIGE
Using Your Printer 23
Character Pitch
Important!
Front panel settings for character pitch are normally
overridden by software commands.
Character pitch determines how many characters will print on
each line. You can choose a specific fixed width for each
character of from 10 to 20 characters per inch (CPI). The
higher cpi settings are often used for spreadsheets.
In LQ mode, you can select proportional (PROP) which 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.
Set the character pitch by pressing
(1) until the LED beside the desired setting glows.
CHARACTER PITCH/RESET
24 Microline 490/491 User’s Guide
Printer Reset
Clearing some error conditions requires that you reset
(reinitialize) the printer. To do this:
1 Press and release
The
SEL
light goes out.
2 Press and hold
PITCH.
Important!
Pressing
SHIFT
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.
SEL (1) to take the printer off-line.
SHIFT (2), then press RESET/CHARACTER
+
RESET
reinitializes the printer, but does not
Emulations
• Epson® LQ — factory setting
®
•IBM
•IBM
Changing Emulations
1 Make sure paper is loaded.
2 Press and hold
3 Press
4 Press TEAR (4) repeatedly until the emulation you wish to
5 Press and hold
Proprinter
®
AGM
SHIFT (2), then press SEL (1).
LF (3).
The following line prints:
Printer ControlEmulation ModeEPSON LQ
select prints in the right-hand column.
SHIFT (2), then press SEL (1) to save your
setting and exit the Menu Mode.
Using Your Printer 25
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.
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.
Menu Mode Keys
26
GROUP Key
Prints the next Group in the Menu.
With the
ITEM Key
Prints the next Item in the Group.
With the
SET Key
Prints the next setting for an Item.
With the
PRINT Key
Prints a copy of all the Menu settings.
With the
Group selected.
MENU Light
Glows when the printer is in the Menu Mode.
SHIFT key, prints the previous Group.
SHIFT key, prints the previous Item in the Group.
SHIFT key, prints the previous setting for an Item.
SHIFT key, prints the current settings for the
Entering and Exiting Menu Mode
To enter or exit the Menu Mode, hold SHIFT while pressing
SEL.
Resetting the Menu to the Factory Defaults
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.
To reset the Menu to the standard settings (factory defaults):
1 Turn the printer off.
2 Press
SEL + LF while turning the printer on.
Printing the Menu Settings
Printing the Current Menu Settings
1 Make sure paper is loaded in the printer.
2 Press and hold
Mode.
3 Press
Printing All Menu Settings
PRINT (PARK key).
To print out a listing of the settings for all menu items,
regardless of the emulation selected or the accessories installed:
1 Make sure paper is loaded in the printer.
2 Press and hold
Mode.
3 Press and hold
SHIFT, then press SEL to enter the Menu
SHIFT, then press SEL to enter the Menu
SHIFT, then press PRINT QUALITY.
Menu Mode 27
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
a Press
GROUP, ITEM and SET keys to make your changes:
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.
Important!
If you turn off the printer without first exiting the Menu
Mode, the changes you have made will be lost.
28 Microline 490/491 User’s Guide
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.
GroupItemSettings (Defaults are set in bold italic)
Receive Buffer Size1 Line, 32K, 64K, 128K
Paper Out OverrideNo, Yes
Print Registration 10, 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 20, 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.
* Appears only when the optional Roll Paper Stand is installed.
Menu Mode31
Menu Settings Table (Continued)
GroupItemSettings (Defaults are set in bold italic)
Reset InhibitNo, Yes
Print Suppress EffectiveNo, Yes
Auto LFNo, Yes
Auto CR*No, Yes
CSF Bin Select†Bin 1, Bin 2
SI Select Pitch (10 cpi)*15 cpi, 17.1 cpi
SI Select Pitch (12 cpi)*12 cpi, 20 cpi
Time Out PrintValid, Invalid
Auto SelectNo, Yes
Graphics SpeedLow, High
Centering PositionDEFAULT, MODE 1, MODE 2
CSF TypeWide, Narrow
Power SavingEnable, Disable
Power Save Time5 min, 10 min, 15 min, 30 min, 60 min
* Appears only when the IBM emulation is selected.
† Appears only when optional Cut Sheet Feeder is installed.
32 Microline 490/491 User’s Guide
Menu Settings Table (Continued)
GroupItemSettings (Defaults are set in bold italic)
* Appears only when the optional Cut Sheet Feeder is installed.
34 Microline 490/491 User’s Guide
Explanations of Menu Items
These explanations are in alphabetical sequence to make it
easier to look them up. Some items only appear when optional
accessories are installed; others appear in several groups in the
menu.
Auto CR, Default =No
IBM Only. If you want the printer to automatically add a
carriage return when a Line Feed is received at the end of a
line, change the setting to Yes.
Auto LF, Default = No
If your printout is consistently double spaced, select No; if it
overprints, select Yes.
Auto Feed XT, Default = Invalid
Epson Only. In the Epson emulation, the XT signal on pin 14 of
the parallel interface can control automatic line feed. Some
interface cables are wired in such a way that automatic line
feed is always in effect: this item eliminates this potential
problem. If your system uses pin 14 of the parallel interface to
control automatic line feed, change the setting to Valid.
Auto Select, Default = No
Determines whether or not your printer will automatically be
selected after you load in paper. With the factory default
engaged, the printer will be deselected so that you can set the
Top of Form. If you always use the same Top of Form position,
change the setting to Yes.
Bi-direction, Default = Enable
Change this setting if you wish to disable bidirectional
transmission (PnP) in Nibble mode.
Bottom Margin, Default = Valid
Change to Invalid if you want the printer to ignore the bottom
margin setting.
CAUTION!!
Setting the Bottom Margin to Invalid can cause loss of data
and damage the printhead by allowing printing without paper.
Menu Mode 35
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:
• SSD -9V, select SSD-
• SSD +9V, select SSD+
• DTR -9V, select DTR
• RTS -9V, select RTS
Busy Time, Default = 200 ms
Appears only when the optional Serial Interface is installed.
Sets the length of the busy signal when the Ready/Busy
protocol (factory default) is engaged,
Centering Position, Default = DEFAULT
Used to limit printhead travel when printing narrow columns.
• Select Mode 1 for the narrow carriage printer.
• Select Mode 1 or Mode 2 for the wide carriage printer.
Character Set, Default = IBM Set I
Use this to switch character sets to IBM Set II
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
Appears only when the optional Dual-Bin Cut Sheet Feeder is
installed. Use this to switch to Bin 2 as the default.
CSF Type, Default = Wide
To avoid paper jams, change this setting to Narrow if you are
using the optional Cut Sheet Feeder on the wide model ML491
printer.
Diagnostic Test, Default = No
Appears only when the optional Serial Interface is installed.
Select yes to perform a diagnostic test of the serial interface.
DSR Signal, Default = Valid
Appears only when the optional Serial Interface is installed.
Used with the Ready/Busy protocol (factory default) to select
the way your system handles the DSR signal.
36 Microline 490/491 User’s Guide
DTR Signal, Default = Ready on Power Up
Appears only when the optional Serial Interface is installed.
Change to Ready on Select if the DTR signal is required when
the printer is selected (leave as Ready on Power Up if the DTR
signal is required when the printer is turned on).
Emulation Mode, Default = Epson LQ
Selects the printer command set (emulation) you want to
engage.
Form Tear-Off, Default = Off
Choose 500 ms, 1 sec, or 2 sec to turn the Form Tear-Off
feature on and to set the time interval for the printer to wait
before advancing the paper.
Graphics, Default = 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.
Graphics Speed, Default = Low
Change to High for faster printing when optimum print quality
is not an issue.
I-Prime, Default = Buffer Print
Determines what the printer will do when it receives the
I-Prime signal from the software.
• 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.
Language Set, Default = American
Replaces certain standard symbols with special characters used
in foreign languages.
Line Spacing, Default = 6 lpi
Change to 8 lines per inch (lpi) to get more lines on a page.
Menu Mode 37
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.
Important!
This feature also prevents access to the Menu. To access the
Menu in these circumstances, turn the printer off, then hold
down the
Page Length, Default = 11"
SEL
key while turning on the printer.
Selects the length of the paper you are using. This enables the
printer to keep track of the initial printing position (TOF) on
each page.
Page Width, Default = 8"
Wide carriage model only. Change to 13.6" to print on wide
paper.
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.
Caution!!
Engaging Paper Out Override can cause loss of data and
damage the printhead by allowing printing without paper.
Parity, Default = None
Appears only when the optional Serial Interface is installed.
Selects the type of parity your system uses: None, Odd or
Even.
Page Length Control, Default = by Menu Setting
Change the setting to “by Actual Page Length” if you wish to
print on single-sheets longer than 17 inches. When “by Actual
Page Length” is selected, the menu setting for Top Feed Page
Length is ignored.
38 Microline 490/491 User’s Guide
Pin 18, Default = +5V
Sets the signal on pin 18 to +5 volts or open.
Pitch, Default = 10 cpi
Choose the character width, in characters per inch (cpi).
Power Save Time, Default = 5 min
Sets the interval the printer waits for more data before it goes
into the power save mode. Power Saving must be set to enable
(the factory default) for this to be effective.
Power Saving, Default = Enable
Change to Disable if you wish to prevent the printer from
entering the Power Save mode after the selected interval.
Proportional Spacing, Default = No
Change the setting to Yes to engage proportional spacing of
characters.
Protocol, Default = Ready/Busy
Appears only if the optional Serial Interface is installed.
Change to X-ON / X-Off if that is the type of protocol your
system uses.
Print Mode, Default = LQ Courier
Choose the quality and typeface of printing.
Print Registration, Default = 0
Change the setting as required to obtain the best registration for
bi-directional printing.
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.
Receive Buffer Size, Default = 64K
Selects the amount of memory devoted to holding received
data. Choosing 1 Line will tie up your computer while printing,
but if you abort the print job, the printer will stop much sooner.
Reset Inhibit, Default = No
Select Yes if you wish the printer to ignore the reset command
sent by software. This prevents your software from changing
the settings you make through the front panel controls or
through printer commands.
Note: This will also prevent your software from clearing out
existing settings when you finish printing one document
and switch to another.
Menu Mode 39
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.
Style, Default = Normal
Change to italics if you want the printed characters to be
slanted.
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.
SI Select Pitch 12 cpi, Default = 20 cpi
IBM emulation only. Sets the pitch to be engaged when the
printer control panel is set for 12 cpi and the SI command is
received.
Size, Default = Single
Change to Double for double width and height printing.
Skip Over Perforation, Default = No
Change to Yes if you want the printer to go to the next page
when it comes within 1" (25 mm) of the bottom of the page.
Keep it set to No if your software has its own page formatting
controls.
Time Out Print, Default = Valid
If your software spends a long time processing between
portions of data it feeds to the printer, change the setting to
Invalid to keep your printer from dumping the received data
while it is waiting for more.
Wait Time, Default = 1 sec
Sets the amount of time the printer will wait for more data
before moving to the form tear-off position.
Zero Character, Default = 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.
40 Microline 490/491 User’s Guide
Chapter 5: Maintenance
Replacing the Ribbon Cartridge
Important!
Make sure you have the correct replacement ribbon for the
your printer. The wrong ribbon will not print when installed
in your printer.
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.
41
CAUTION!
The printhead may be
HOT!
3 Swing the used ribbon cartridge up off the printhead, lift it
out, and discard it.
4 Unpack the new ribbon cartridge and install it.
Important!
Do not remove the ribbon shield (1) from the ribbon!
5 Turn the take-up knob in the direction of the arrow to take
up any ribbon slack.
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.
If ribbon should contact the skin
Wash thoroughly with soap and water.
For more information
See the Material Safety Data Sheet in your Warranty,
Regulatory, and Safety Information booklet.
42 Microline 490/491 User’s Guide
Loading Paper
Rear Feed
Note: If you have any paper in the paper path, remove it
before installing rear feed paper.
Lock Lever
Upper Tractor Cover
Pins
Loading Rear Feed Paper from the Back of the Printer
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.”
1 Make sure the paper lever is forward (position marked
“REAR”).
2 Open the access cover (1).
Maintenance 43
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.
Careful!
If you push the sheet guide too hard against the roller
assembly, it may dislodge it. If it does, be sure to reseat the
roller assembly before continuing.
44 Microline 490/491 User’s Guide
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:
ML491
ML490
Note: The movement of the right tractor is limited to ensure
that the paper covers the paper sensor.
7 Open the tractor covers.
Maintenance 45
8 Place continuous forms paper on the first two pins of either
tractor.
Important!
You must keep the number of paper holes engaged on either
pin the same. If you don’t the paper will skew and jam.
9 Close the right tractor cover.
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.
Note: If the paper is too loose or too tight it can cause jams.
46 Microline 490/491 User’s Guide
11 Lower the sheet guide and slide it toward the front of the
printer until the marks align.
12 Place the wire guide (“1” in the illustration for the step
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.
Maintenance 47
Loading Rear Feed Paper from the Front of the Printer
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
1 Make sure the paper lever is forward (position marked
“REAR”).
2 Open the access cover (1).
3 Grasp the tabs and lift off the sheet guide.
4 Pull up on the lock levers to release them.
48 Microline 490/491 User’s Guide
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
printer for the two most common paper sizes:
ML490:
ML491:
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.
Important!
You must keep the number of paper holes engaged on either
pin the same. If you don’t the paper will jam.
Maintenance 49
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.
Note: If the paper is too loose or too tight it can cause jams.
9 Reinstall the sheet guide.
50 Microline 490/491 User’s Guide
10Place the wire guide (1) in the sheet guide on the pull-up
roller assembly.
11 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.
Maintenance 51
Top Feed (Single Sheets)
Note: If you have continuous form paper in the path, press
PARK
to remove it before loading single sheets.
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.
1 Make sure the printer is on and deselected (
SEL light off).
2 Place the paper lever in the center position (marked “TOP”).
52 Microline 490/491 User’s Guide
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.
Important!
If the paper does not feed in, remove it. Check the paper lever
position. Make sure the
hold the
SHIFT
key and press the
ALARM
light is on: if it is flashing,
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.
Maintenance 53
Clearing Paper Jams
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.
3 Open the access cover (1) and remove the pull-up roller
assembly (2). Remove any torn pieces of paper.
4 Lift the sheet guide (1) and reload paper. Make sure you
lock the tractor covers.
5 Lower the sheet guide, then install the pull-up roller
assembly and close the access cover.
54 Microline 490/491 User’s Guide
6 Turn on the printer and press FF/LOAD.
Rear-Feed, Repeating Paper Jams
If the paper keeps jamming, you may have:
• defective paper
• misaligned paper
• bits of paper stuck in the paper path
Defective Paper
Replace the paper with a fresh stack.
Misaligned Paper
1 Turn off the printer.
2 Use the platen knob to back the paper all the way out of the
printer.
3 Tear off a couple of sheets of paper, leaving a new, clean,
square-cut edge.
4 Reload the paper and turn the printer back on.
Bits of Paper Stuck in the Paper Path
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.
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.
Maintenance 55
4 Remove any torn pieces of paper.
5 Fold some continuous-form paper over three times to make a
page four sheets thick. Then, load it on the tractors and close
and lock the covers.
6 Use the platen knob to draw the quadruple-thick page
around the platen. This brings out jammed pieces of paper.
7 Remove the paper pieces. Then, use the platen knob to back
the paper out.
8 Load regular paper, close and lock the tractor covers.
9 Install the sheet guide, then install the pull-up roller
assembly and close the access cover.
10 Turn the printer on and press FF/LOAD.
56 Microline 490/491 User’s Guide
Single-Sheet Paper Jams
1 Turn off the printer.
2 Use the platen knob to back the paper out.
3 Open the access cover (1) and remove the pull-up roller
assembly (2).
4 Remove any torn pieces from around the carriage.
5 Reinstall the pull-up roller assembly and close the access
cover.
Maintenance 57
Cleaning the Housing
You should clean the printer housing every six months (or after
about 300 hours of operation).
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).
4 Use a clean, dry cloth to dust around the carriage shaft and
platen. Remove any loose bits of paper.
5 Reinstall the pull-up roller assembly and close the access
cover.
58 Microline 490/491 User’s Guide
Chapter 6: Troubleshooting
General Information
Here are some general things to check before proceeding with
detailed troubleshooting.
• 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?
Note: Settings in your software application will normally
override any settings in your printer driver.
Printer driver settings normally override settings from
the printer menu or printer front panel.
59
Problems / Solutions
Problem
My word processor files do not print the way I have the menu
and front panel set.
The I-Prime signal will automatically override any front panel
settings you have made. To eliminate this problem, enter the
Menu Mode, go to the Parallel Interface group and change the
setting for I Prime to Invalid.
For more information on changing menu settings, see
“Changing the Menu Settings” in Chapter 4.
Solution
Remember:
• Settings in your software application can override settings in
your printer driver.
• Your printer driver settings can override any settings from the
printer menu or printer front panel.
Before sending a file to the printer, many word processors send
either an “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.
60 Microline 490/491 User’s Guide
Problem
Nothing happens when I turn on the printer.
Solution
Check the power cord connection to the outlet and to the
printer. If you are using a power strip, make sure it is turned on,
and that the fuse hasn’t blown or that the circuit breaker hasn’t
tripped.
Problem
Problem
The printer does not print when the computer sends data.
Solutions
1 Is the
SEL light on? If not, press the SEL key.
2 Check that the interface cable is securely connected to both
the printer and the computer.
3 If you have the optional serial interface board installed,
check to be sure that it is firmly seated in the printer.
I'm getting strange symbols, incorrect fonts, etc., when I try to
print a document.
Solutions
1 Check to be sure that the printer driver you have selected in
your software matches the printer emulation.
• Press
SHIFT and SEL keys, then press GROUP key.
• 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.
Troubleshooting 61
Problem
Problem
Ink smears on the paper when I print narrow columns.
Solution
This may be caused by excessive printhead travel from the
centering position. Enter the Menu and set the Centering
Position to MODE 1. See “Using Your Printer, Menu Mode.”
For the wide-carriage printer, if MODE 1 doesn't work, try
setting the Centering Position to MODE 2.
I've installed a new ribbon and the printing is smeared and
streaked.
Solution
The ribbon shield (1) is either loose or missing.
Remove the ribbon cartridge and check the ribbon shield.
• If it is loose, secure it.
• If it is missing, find it and install it.
62 Microline 490/491 User’s Guide
Problem
Problem
There are dots missing in my printouts.
Solution
The head gap may not be set correctly. Try moving the headgap
lever to a lower setting. If that doesn’t help, the printhead may
be damaged; call for service.
Problem
The ALARM light is flashing.
Solution
Try turning the printer off and then back on again. If the light
still blinks, call for service.
The ALARM light is on and the Character Pitch 10 light is
flashing.
Solution
This indicates that the paper lever is set at the wrong position
for the paper you are trying to use. Move it to the proper
setting.
Problem
The ALARM light is on and the Character Pitch 15 light is
flashing.
Solution
This indicates a paper jam. Press the
SEL key and correct the
paper jam situation. See “Clearing Paper Jams,” in Chapter 4.
Troubleshooting 63
Problem
Problem
The printer needs paper. The ALARM is not on. I can’t load
paper.
Solution
1 Press and release the
2 Press and hold the
CHARACTER PITCH key.
3 The
ALARM light comes on and you can now load paper.
SEL key.
SHIFT key and press the RESET /
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.
The Print Quality and Character Pitch keys on the front panel
don't work.
Solution
The Operator Panel Function in the printer menu can be used to
disable these buttons (Limited Function). If the printer is part of
a customized system or if it is used by a number of people, the
system manager may have used this option to make sure the
printer is always set properly.
Check with your system manager before changing any menu
settings.
64 Microline 490/491 User’s Guide
Appendix A: Parts & Accessories
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.
• Consult the dealer where your purchased your printer.
• Locate an Authorized Oki Data Reseller by visiting one of
our web sites
http://my.okidata.com (allows you to register your
product and personalize your own support needs)
http://www.okidata.com (provides general information)
• In the United States, purchase directly from Oki Data
- Via the Internet
http://my.okidata.com
http://www.okidata.com
- Via telephone
Order toll-free by phone at 1-800-654-3282
(1-800-OKI-DATA) using VISA
AmEx®.
• In Canada, call 888-309-4570.
®
, MasterCard®, or
65
Replacement Parts
ItemPart Number
Both Models
Ribbon Cartridge (
) ------------------------------- 42377801
Platen Knob (
Power Cord (
Scalable: 11 to 64 points
LQ Swiss Bold 10 cpi, 12 cpi, Proportional: Normal
Utility Gothic10 & 12 cpi: Normal, Superscript, Subscript
HSD Gothic10 cpi: Normal
Specifications 77
Paper Specifications: ML490
Single (Cut) Sheets
Feed: Top Only
Weight: 14 to 24 lb. US Bond (52.6 to 90 g/m
Width Range: 7.2" to 8.5" (183 to 216 mm)
Single-part, continuous forms
Feed: Rear, Bottom*
Weight: 12 to 24 lb. US Bond (45 to 90 g/m
Width Range: 3" to 10" (76 to 254 mm)
Carbonless continuous forms (orig. + 4 copies)
Feed: Rear, Bottom*
Weight: 9 to 11 lb.
Width Range: 3" to 10" (76 to 254 mm)
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)
Labels
Feed: Bottom* Only
Weight: Not applicable
2
)
Width Range: 3" to 10" (76 to 254 mm)
Envelopes, single feed
Feed: Top Only
Weight: Max. 24 lb.
2
)
Width Range: 6.5" to 9.5" (165 to 241 mm)
Envelopes, continuous feed, non-overlap
Feed: Bottom* Only
Weight: Max. 24 lb.
Width Range: 6.5" to 9.5" (165 to 241 mm)
Card Stock
Feed: Bottom*
2
Weight: Max. 100 lb. Index (180 g/m
)
Width Range: Not applicable
* Bottom feed requires optional pull or push tractor
78 Microline 490/491 User’s Guide
Paper Specifications: ML491
Single (Cut) Sheet
Feed: Top Only
Weight: 14 to 24 lb. US Bond (52.6 to 90 g/m
Width Range: 7.2" to 14.3" (182.8 to 363.2 mm)
Single-part, continuous forms
Feed: Rear, Bottom*
Weight: 12 to 24 lb. US Bond (45 to 90 g/m
Width Range: 3" to 16" (76.2 to 406.4 mm)
Carbonless continuous forms
Feed: Rear, Bottom*
Weight: 9 to 11 lb.
Width Range: 3" to 16" (76.2 to 406.4 mm)
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)
Labels
Feed: Bottom* Only
Weight: Not applicable
2
)
Width Range: 3" to 16" (76.2 to 406.4 mm)
Envelopes, single feed
Feed: Top Only
Weight: Max. 24 lb.
2
)
Width Range: 6.5" to 9.5" (165.1 to 241.3 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)
Card Stock
Feed: Bottom* Only
2
Weight: Max. 100 lb. Index (180 g/m
)
Width Range: Not applicable
* Bottom feed requires optional pull or push tractor
Specifications 79
Environmental Requirements
Physical Specifications
Temperature
Operating: 41 to 95°F (5 to 36°C)
Storage: 14 to 122°F (-10 to 50°C)
Humidity
Operating: 20 to 80% RH
Storage: 5 to 95% RH
Electrical Requirements
• 120 volts ac, (+6%, -15%)
50 or 60 Hz (±2%)
78 W Typical, 10 W idle
• 230 ac, (+15%, -14 %)
50 or 60 Hz (±2%)
78 W Typical, 10 W idle
Note: Height dimensions do not include the acoustic cover.
ML490
Size (WxDxH): 17.1" x 16.1" x 6"
(434 x 409 x 153 mm)
Weight: 16.7 lbs. (7.6 kg)
ML491
Size (WxDxH): 23.1" x 16.1" x 6"
(588 x 409 x 153 mm)
Weight: 21.1 lbs. (9.6 kg)
80 Microline 490/491 User’s Guide
Appendix D: Installation
Location
• 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.
Printer
Ribbon Cartridge
Power Cord
81
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.
2 Remove the printhead shipping restraint.
3 Remove the shipping restraint from the pull-up roller
assembly (1).
82 Microline 490/491 User’s Guide
4 Use the tabs (1) to lift and remove the sheet guide, then
remove the shipping restraint.
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.
Installation 83
Install the Ribbon Cartridge
Important!
Make sure you have the correct replacement ribbon for the
your printer. The wrong ribbon will not print when installed
in your printer.
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).
CAUTION!
The printhead may be
3 Unpack the new ribbon cartridge and install it on the
printhead.
Important!
Do not remove the ribbon shield (1) from the ribbon!
4 Turn the take-up knob (1) in the direction of the molded-in
arrow to take up any ribbon slack.
HOT!
84 Microline 490/491 User’s Guide
5 Close the access cover and turn the printer on.
Power Connection
1 Make sure both the printer and the computer are OFF.
2 Plug the power cord into the back of the printer, then into a
grounded outlet.
3 Turn on the printer.
Computer Connections
Parallel (LPT): IEEE 1284
• Requires bidirectional cable, max. length 6 ft. (1.8 m), not
supplied.
• 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 the printer and computer back on.
Installation 85
USB: Specification 1.1 Compliant
• Requires USB 1.1 cable, maximum length 19.7 ft. (5 m), not
supplied.
• 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.
Loading Paper
For instructions on loading paper, see “Loading Paper” in
Chapter 5.
86 Microline 490/491 User’s Guide
Testing the Printer
• Font Sample Test
• Rolling ASCII Test
• Hexadecimal Dump Mode
Font Sample Test
Important!
Wide carriage Model ML491: 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.
The Font Sample Test prints a sample of the fonts standard to
the printer.
The top of the printout shows the Printer Model, Emulation,
Country Code, Interface, and Firmware Revision Level.
1 Make sure paper is loaded.
2 Turn off the printer.
3 Press and hold the
The printer prints a page of font samples and the test ends.
LF key while turning the printer back on.
Installation 87
Rolling ASCII Test
Important!
Wide carriage Model ML491: 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.
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).
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.)
The printer prints the rolling ASCII text page after page.
4 Press
SEL to end the test.
88 Microline 490/491 User’s Guide
Hexadecimal Dump Mode
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.
For example, the following line of BASIC code
LPRINT CHR$ (27);0;CHR$ (30);This is an
example of a hexadecimal dump.
would print like this:
Note: In the ASCII format, all non-printable characters will be
represented by a period.
To engage the Hexadecimal Dump Mode:
1 Make sure paper is loaded.
2 Turn off the printer.
3 Hold the
turning on the printer.
To exit the Hexadecimal Dump Mode:
• Press the
or
• Turn the printer off, then on again.
SEL and FF/LOAD keys for several seconds while
SEL key
Emulations
The factory default emulation for your printer is Epson® LQ.
If you wish to change to one of the IBM emulations, see
“Changing Emulations” in Chapter 3.
Printer Drivers
The Oki driver for your printer is provided on the CD included
with the printer. You can either load the Oki driver or select one
of the compatible drivers listed below in your software
application.
Installation 89
Loading the OKI Driver
Using a Compatible Driver
Parallel Interface
1 Insert the CD into your CD-ROM drive.
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.
2 Select your printer model.
3 When the Menu Installer window appears, click the Printer
Software button.
4 Follow the on-screen instructions.
USB Interface
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.
®
Note: See your software documentation for information on
how to select a printer driver.
The drivers below are listed by decreasing compatibility with
your printer. Use one as close to the top of the list as possible.
Epson LQ
• Epson LQ 870/1170
• Epson LQ 80/1000
• Epson LQ 2500
IBM Proprinter
• IBM Proprinter X24e/XL24e
• IBM Proprinter X24/XL24
• IBM Proprinter
IBM X24e AGM/XL24e AGM
Use this emulation only when you’ve selected an IBM
Proprinter X24e/XL24e driver and you need to use Epson
Letter Quality (LQ) high density graphics.