User guide

6 Installation
3. Holding ribbon cartridge with knob fac-
ing up and ribbon sheild facing platen,
fit grooves on either side at back end of
cartridge over pins on ribbon plate.
4. Lower front of cartridge over printhead
until it snaps into place, then turn knob
in direction of arrow (clockwise) to take
up ribbon slack.
5. The headgap lever by the side of cartridge
adjusts for different paper thicknesses.
Set it for the number of sheets in the
forms you’re using from 1 to 4; use set-
ting 5 for envelopes or extra-thick pa-
per. Adjust the setting up or down for
the best print quality.
Note: When the setting is set at 2~5, the
printer automatically slows down for better
print quality with thicker multipart forms.
Important! Be sure to use only ribbons
specifically for use with MICROLINE 390
series.
For best results, use genuine OKI ribbons.
Making Connections
Connection with Computer
There 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.
Ribbon
shield
Knob
Setting
Headgap lever
position
Number of
sheets
1
2
3
4
5
1
2
3
4
5
1
2
3
4
envelopes or
extra-thick paper
1
2
3
4
5
Knob
Printhead
Headgap lever