Oki manual Microline 490/491 User’s Guide

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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 following the operating instructions.

4Microline 490/491 User’s Guide

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Contents User’s Guide Mailing Address Safety Microline 490/491 User’s Guide Contents Troubleshooting Introduction Printer FeaturesOki Data on the Internet Helpful Hints Saving Money Forms Tear-OffSaving Time Internet SupportControlling Access to the Printer Operation TipsTop of Form TOF Turning the Platen KnobUsing Your Printer Parts Identification Rear Feed Continuous FormsParts Identification Top Feed Single Sheets Top of Form TOF Top of Form TOF and Forms Tear-OffDetermining if Forms Tear-Off is Off or On Setting Top of Form TOF Forms Tear-Off OFF Default SettingForms Tear-Off Set to on Resetting Top of Form to the Factory Default Temporarily Changing the Top of Form PositionForms Tear-Off Feature Potential Problems with Software PackagesPaper Park Changing the Forms Tear-Off SettingManual Forms Tear Off Changing Paper Paths Continuous Forms toSingle SheetsSingle Sheets toContinuous Forms Printhead Gap Print Quality Typefaces LQ Mode Character Pitch Emulations Printer ResetChanging Emulations Menu Mode Menu Mode KeysResetting the Menu to the Factory Defaults Entering and Exiting Menu ModePrinting the Menu Settings Changing the Menu Settings Menu Settings Table Group Settings Defaults are set in bold italic13.6 500 ms, 1 sec, 2 sec DEFAULT, Mode 1, Mode Invalid, Valid Menu Settings Table Explanations of Menu Items Use this to switch character sets to IBM Set Selects the printer command set emulation you want to engage Sets the signal on pin 18 to +5 volts or open Choose the quality and typeface of printing Change to Double for double width and height printing Maintenance Replacing the Ribbon CartridgePrinthead may be HOT Loading Paper Rear FeedCareful Open the tractor covers Microline 490/491 User’s Guide Maintenance Loading Rear Feed Paper from the Front of the Printer ML490ML491 Microline 490/491 User’s Guide Maintenance Top Feed Single Sheets Maintenance Clearing Paper Jams Rear-Feed Paper JamsRear-Feed, Repeating Paper Jams Microline 490/491 User’s Guide Single-Sheet Paper Jams Cleaning the Housing Troubleshooting General InformationProblems / Solutions SolutionSolutions Ink smears on the paper when I print narrow columns There are dots missing in my printouts Printer needs paper. The Alarm is not on. I can’t load paper Appendix a Parts & Accessories Purchasing Parts & AccessoriesReplacement Parts Part NumberAccessories Option Part NumberEpson LQ Commands Appendix B Printer Control CodesDEL Enabled On DC3 Carriage Return Character Pitch, Select 10 cpi IBM Commands ESC % HESC Q $ Appendix C Specifications Graphics Resolution Emulations co-residentPrint Speed Characters per Line cplBar Codes Resident FontsResident Typefaces Paper Specifications ML490 Paper Specifications ML491 Environmental Requirements Physical SpecificationsElectrical Requirements Location Appendix D InstallationUnpack Microline 490/491 User’s Guide Installation Install the Ribbon Cartridge Computer Connections Power ConnectionParallel LPT Ieee USB Specification 1.1 Compliant Testing the Printer Font Sample TestRolling Ascii Test Hexadecimal Dump Mode Printer DriversUsing a Compatible Driver Loading the OKI DriverIndex IBM Index Tear