Oki ML420 User Manual
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Oki ML420 User Manual

Oki microline users' guide
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59348301

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  • Page 1 User’s Guide 59348301...
  • Page 2 February, 2006 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...

  • Page 3: Safety

    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.
  • Page 4 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.

  • Page 5: Table Of Contents

    Operation Tips ... 9 Top of Form (TOF) ... 9 Turning the Platen Knob ... 9 Controlling Access to the Printer ... 9 Chapter 3: Using Your Printer ... 10 Parts Identification: Rear Feed (Continuous Forms) ... 10 Parts Identification: Top Feed (Single Sheets) ... 11 Top of Form (TOF) ...
  • Page 6 Microline 420/421 User’s Guide 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 ...

  • Page 7: Chapter 1: Introduction

    • This rugged 9-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.

  • Page 8: Chapter 2: Helpful Hints

    Off” in Chapter 3. Saving Time Internet Support Oki Data provides support via the Internet: • is the main web site, the gateway to Oki www.okidata.com Data’s products and services. • is a powerful area of Oki Data’s web http://my.okidata.com site designed to help you personalize the information and service you get from Oki Data.

  • Page 9: Operation Tips

    Turning the Platen Knob 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.

  • Page 10: Chapter 3: Using Your Printer

    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...

  • Page 11: Parts Identification: Top Feed (Single Sheets)

    Parts Identification: Top Feed Note: For single-sheet printing, the paper lever must be in the middle position. (Single Sheets) Paper Guides Sheet Guide Paper Lever On-Off Switch Platen Knob Control Panel Acoustic Cover (open) Using Your Printer...

  • Page 12: Top Of Form (Tof)

    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"...

  • Page 13: Determining If Forms Tear-Off Is Off Or On

    Roll Paper Stand is installed). To use the TEAR key: 1 Make sure paper is loaded. 2 Press (3). TEAR • If the paper moves up, Forms Tear-off is off. • If the paper moves down, Forms Tear-off is on. Using Your Printer...

  • Page 14: Setting Top Of Form (Tof): Forms Tear-Off Off (Default Setting)

    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.

  • Page 15: Forms Tear-Off Set To On

    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.

  • Page 16: 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!

  • Page 17: Forms Tear-Off Feature

    (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.

  • Page 18: Changing The Forms Tear-Off Setting

    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.

  • Page 19: Changing Paper Paths

    3 Pivot the wire feed guide into the sheet guide. 4 Move the paper lever (1) to the middle position marked “TOP.” PARK 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...

  • Page 20: Single Sheets To Continuous Forms

    Single Sheets to Continuous Forms 1 Press to remove the single-sheet paper. FF/LOAD 2 Lower the sheet guide into the continuous-forms position. 3 Swing the wire feed guide over onto the pull-up roller. Microline 420/421 User’s Guide 4 Move the paper lever to the appropriate position. •...

  • Page 21: Printhead Gap

    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...

  • Page 22: Print Quality

    Print Quality Important! Front panel settings for print quality and character pitch are normally overridden by software commands. Press (1) to select: PRINT QUALITY UTL: Utility—the default • Medium quality, medium speed (380 cps) • Gothic typeface only Microline 420/421 User’s Guide HSD: High Speed Draft •...

  • Page 23: Character Pitch

    This provides a more polished, typeset appearance. Note: To reset the printer to the factory default character pitch, deselect the printer, then press and hold the key while pressing the...

  • Page 24: Printer Reset

    SHIFT RESET 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.

  • Page 25: Chapter 4: Menu Mode

    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 GROUP Key Prints the next Group in the Menu.

  • Page 26: Entering And Exiting Menu Mode

    Microline 420/421User’s Guide Printing the Menu Settings while pressing SHIFT 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 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.

  • Page 27: Changing The Menu Settings

    , then press SHIFT 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. to enter the Menu to exit the Menu Mode Mode Menu...

  • Page 28: Menu Settings Table

    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 Printer Control Emulation Mode Font Print Mode...
  • Page 29 Menu Settings Table (Continued) Group Item Rear Feed Line Spacing Form Tear-Off Skip Over Perforation Page Width (wide model) Page Length Bottom Feed Line Spacing Form Tear-Off Skip Over Perforation Page Width (wide model) Page Length Settings (Defaults are set in bold italic) 6 LPI, 8 LPI Off, 500 ms, 1 sec, 2 sec No, Yes...
  • Page 30 Menu Settings Table (Continued) Group Item Top Feed Line Spacing Form Tear-Off* Bottom Margin Page Width (wide model) Page Length Wait Time Page Length Control Set-Up Graphics 7 or 8 Bit Graphics† Receive Buffer Size Paper Out Override * Appears only when the optional Roll Paper Stand is installed. †...
  • Page 31 Menu Settings Table (Continued) Group Item Setup (cont..) Print Registration 1 Print Registration 2 7 or 8 Bits Data Word* Operator Panel Function Reset Inhibit Print Suppress Effective Auto LF † Auto CR CSF Bin Select** Print DEL Code* * Appears only when MICROLINE emulation is selected. †...
  • Page 32 Menu Settings Table (Continued) Group Item SI Select Pitch (10 cpi)* SI Select Pitch (12 cpi)* Time Out Print Auto Select Centering Position CSF Type† Power Saving Power Save Time Parallel I/F I-Prime Pin 18 Auto Feed XT** Bi-Direction * Appears only when the IBM emulation is selected. †...
  • Page 33 Menu Settings Table (Continued) Group Item Serial IF* Parity Serial Data 7/8 Bits Protocol Diagnostic Test Busy Line Baud Rate DSR Signal DTR Signal Busy Time * Appears only when the optional Serial Interface is installed. Settings (Defaults are set in bold italic) None, Odd, Even 8 Bits, 7 Bits Ready/Busy, X/On / X/Off...
  • Page 34 Menu Settings Table (Continued) Group Item CSF Bin 1* Line Spacing Bottom Margin Page Width (Wide model) Page Length CSF Bin 2* Line Spacing Bottom Margin Page Length * Appears only when the optional Cut Sheet Feeder is installed. Microline 420/421User’s Guide Settings (Defaults are set in bold italic) 6 LPI, 8 LPI Valid, Invalid...

  • Page 35: Explanations Of Menu Items

    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.
  • Page 36 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.
  • Page 37 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).
  • Page 38 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. Page Length Control, Default = by Actual Page Length...
  • Page 39 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.
  • Page 40 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.
  • Page 41 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.

  • Page 42: Chapter 5: Maintenance

    Important! 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.
  • Page 43 Do not remove the ribbon shield (1) from the ribbon! 5 Turn the take-up knob (1) 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.

  • Page 44: Loading Paper

    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.”...
  • Page 45 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.
  • Page 46 5 From the back of the printer, locate the tractors (1). Microline 420/421 User’s Guide 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...
  • Page 47 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.
  • Page 48 11 Lower the sheet guide and slide it toward the front of the printer until the marks align. Microline 420/421 User’s Guide 12 Place the wire guide (“1” in the illustration for the step above) in the sheet guide on the pull-up roller assembly.
  • Page 49 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.
  • Page 50 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. 5 You will find reference marks (1 in illustration below) on the printer for the two most common paper sizes:...
  • Page 51 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.
  • Page 52 10 Place the wire guide (1) in the sheet guide on the pull-up roller assembly. Microline 420/421 User’s Guide 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.

  • Page 53: Top Feed (Single Sheets)

    PARK 1 Make sure the printer is on and deselected ( 2 Place the paper lever in the center position (marked “TOP”). 3 Open the acoustic cover (1) and raise the sheet guide to the single-sheet position.
  • Page 54 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. Microline 420/421 User’s Guide Important! If the paper does not feed in, remove it. Check the paper lever position.

  • Page 55: Clearing Paper Jams

    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).

  • Page 56: Rear-Feed, Repeating Paper Jams

    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).
  • Page 57 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 Maintenance...

  • Page 58: Single-Sheet Paper Jams

    Single-Sheet Paper Jams 1 Turn off the printer. 2 Use the platen knob to back the paper out. Microline 420/421 User’s Guide 3 Open the access cover (1) and remove the pull-up roller assembly (2). 4 Remove any torn pieces from around the carriage.

  • Page 59: Cleaning The Housing

    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.

  • Page 60: Chapter 6: Troubleshooting

    • 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.

  • Page 61: Problems / Solutions

    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.
  • Page 62 I'm getting strange symbols, incorrect fonts, etc., when I try to print a document. Solutions key. 1 Check to be sure that the printer driver you have selected in your software matches the printer emulation. • Press • This will print a line showing the emulation you have selected.
  • Page 63 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.
  • Page 64 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. Microline 420/421 User’s Guide Problem The ALARM light is on and the Character Pitch 10 light is flashing.
  • Page 65 Problem The printer needs paper. The ALARM is not on and I can’t load paper. Solution 1 Press and release the key. 2 Press and hold the key and press the SHIFT key. CHARACTER PITCH light comes on and you can now load paper.

  • Page 66: Appendix A: Parts & Accessories

    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...

  • Page 67: Replacement Parts

    Ribbon Cartridge ( ) ------------------------------- 42377801 Platen Knob ( ) ------------------------------------- 51902220 Power Cord ( ) ------------------------------------- 56631801 Printhead ( ) ---------------------------------------- 41923901 Model ML420 Access Cover ( ) ----------------------------------- 42115401 Sheet Guide ( ) ------------------------------------- 51009509 Pull-Up Roller Assembly ( ) --------------------- 42044701...

  • Page 68: Accessories

    Accessories Option 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...

  • Page 69: Appendix B: Printer Control Codes

    Appendix B: Printer Control Codes This section lists the most commonly used printer control codes. You will find a comprehensive listing of the control codes (English only), on your Printer CD. To access it: 1 Place the CD in your CD-ROM drive and wait for it to AutoPlay.
  • Page 70 IBM Proprinter III Commands (continued) IBM Command ASCII Double Width On ESC W 1 Double Width Off ESC W 0 Emphasized Printing On ESC E Emphasized Printing Off ESC F Enhanced Printing On ESC G Enhanced Printing Off ESC H Form Feed Form Length n inches (n = 1 to 255)
  • Page 71 Paper Out Sensor Off ESC 8 Paper Out Sensor On ESC 9 Print Quality, Select HSD ESC # 0 Print Suppress Mode On ML420 ESC Q ETX ML421 ESC Q SYN Print Suppress Mode Off Proportional Spacing On ESC P 1...

  • Page 72: Epson Fx Commands

    Epson FX Commands Epson Command ASCII Backspace Carriage Return, Execute Character Pitch Select 10 cpi ESC P Select 12 cpi ESC M Select 15 cpi ESC g Begin 10 cpi ESC SI, or SI 27 15, or 15 Cancel Condensed Print Delete Microline 420/421 User’s Guide Epson Command...
  • Page 73 Epson FX Commands (continued) Epson Command ASCII Form Length n Inches (n = 1 to 22) ESC C NUL n 27 67 0 n n Lines (n = 1 to 127) ESC C n Horizontal Tab Justification Left ESC a 0 Center ESC a 1 Right...
  • Page 74 Print Suppress Mode Off Proportional Spacing On ESC p 1 Proportional Spacing Off ESC p 0 Microline 420/421 User’s Guide Epson Command Reset Printer Decimal Clear Buffer & Initialize ESC @ Clear Print Buffer Skip Over Perforation, Cancel 27 40 48...

  • Page 75: Oki Microline Standard Commands

    Oki MICROLINE Standard Commands Oki Command ASCII Backspace Carriage Return Character Pitch Select 10 cpi Select 12 cpi Select 15 cpi ESC g Select 17.1 cpi Select 20 cpi ESC # 3 Character Sets Standard ESC ! 0 Block Graphic...
  • Page 76 Oki MICROLINE Standard Commands (continued) Oki Command ASCII Line Feed Commands w/ Carriage Return w/o Carriage Return ESC DC2 n/144" (n = 0 to 127) ESC % 5 n Reverse ESC LF Line Spacing Set Spacing to 1/6" ESC 6 Set Spacing to 1/8"...
  • Page 77 Oki MICROLINE Standard Commands (continued) Oki Command ASCII Shift-In Shift-Out Software I-Prime ESC } NUL Subscript Printing On ESC L Subscript Printing Off ESC M Superscript Printing On ESC J Superscript Printing Off ESC K Underline Printing On ESC C...

  • Page 78: Appendix C: Specifications

    Appendix C: Specifications Note: Specifications are subject to change without notice. Print Method Impact dot matrix Printhead 9 pins, 0.30 mm (0.0118") diameter, with thermal protection Interfaces Standard: Centronics parallel, IEEE-1284 compliant USB 1.1 Optional: RS-232C Serial Ethernet Print Servers: 6120i 10/100 Base-T, Internal 6020e 10/100 Base-T, External 6010e 10 Base-T, External...

  • Page 79: Print Speed

    Emulations (co-resident) • IBM Proprinter III • Epson FX • Oki MICROLINE Standard Print Speed Speed Mode (Characters per Second) Super Speed Draft (SSD) 570 cps High Speed Draft (HSD) 507 cps Utility 380 cps Near Letter Quality (NLQ) 95 cps...

  • Page 80: Graphics Resolution

    Graphics Resolution Emulation Density IBM, Epson Single Double Quadruple Oki MICROLINE Single Double Quadruple Resident Fonts Print Quality Available Fonts Near Letter Quality Courier, Gothic Utility Gothic High Speed Draft Gothic Super Speed Draft Gothic Microline 420/421 User’s Guide Bar Codes •...
  • Page 81 Paper Specifications: ML420 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"...
  • Page 82 Paper Specifications: ML421 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"...

  • Page 83: Environmental Requirements

    50 or 60 Hz (±2%) 58 W Typical, 10 W idle Physical Specifications Note: Height dimensions do not include the acoustic cover. ML420 Size (WxDxH): 17.1" x 16.1" x 6" (434 x 409 x 153 mm) Weight: 16.7 lbs. (7.6 kg) ML421 Size (WxDxH): 23.1"...

  • Page 84: Appendix D: Installation

    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.
  • Page 85 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).
  • Page 86 4 Use the tabs (1) to lift and remove the sheet guide, then remove the shipping restraint. Microline 420/421 User’s Guide 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.

  • Page 87: Install The Ribbon Cartridge

    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. Ribbon Cartridge Handling • Leave unused ribbon cartridges in their packages until needed.

  • Page 88: Power Connection

    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. Microline 420/421 User’s Guide Computer Connections Parallel (LPT): IEEE 1284 •...

  • Page 89: Usb: Specification 1.1 Compliant

    • 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.

  • Page 90: Testing The Printer

    Country Code, Interface, and Firmware Revision Level. 1 Make sure paper is loaded. 2 Turn off the printer. 3 Press and hold the key while turning the printer back on. The printer prints a page of font samples and the test ends.

  • Page 91: Rolling Ascii Test

    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.

  • Page 92: Hexadecimal Dump Mode

    “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.

  • Page 93: Loading The Oki Driver

    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. IBM Proprinter III • IBM Proprinter III •...

  • Page 94: Index

    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 ...
  • Page 95 Factory defaults, menu mode ... 26 Font Sample Test ... 90 Fonts Embedded Printer Commands ... 62 Resident ... 80 Selecting ... 40 Forms Tear-Off ... 37 Changing ... 18 Top of Form ... 12, 17 Wait Time ... 41 Front Panel Keys ...
  • Page 96 Oki MICROLINE Standard Commands ... 75–77 Operator Panel Function ... 65 Options ... 66 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 ...
  • Page 97 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 Zero character (slashed, unslashed) . 28, 41 Index...

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