6 Installation3. Holding ribbon cartridge with knob fac-ing up and ribbon sheild facing platen,fit grooves on either side at back end ofcartridge over pins on ribbon plate.4. Lower front of cartridge over printheaduntil it snaps into place, then turn knobin direction of arrow (clockwise) to takeup ribbon slack.5. The headgap lever by the side of cartridgeadjusts for different paper thicknesses.Set it for the number of sheets in theforms you’re using from 1 to 4; use set-ting 5 for envelopes or extra-thick pa-per. Adjust the setting up or down forthe best print quality.Note: When the setting is set at 2~5, theprinter automatically slows down for betterprint quality with thicker multipart forms.Important! Be sure to use only ribbonsspecifically for use with MICROLINE 100’,320 series.For best results, use genuine OKI ribbons.Making ConnectionsConnection with ComputerThere instructions are for the standard parallel interface. Instructions for installa-tion/connection of a serial interface are included with the serial interface accessory.For more information on the serial interface accessory, see Chapter 5.RibbonshieldKnobSetting Headgap leverpositionNumber ofsheets123451between 1 and 22between 2 and 331234envelopes orextra-thick paper123KnobPrintheadHeadgap lever