Oki ML420 Series User manual
2
Microline 420/421 & 490/491
Check the contents: 1. Printer
2. Ribbon cartridge
3. Power Cable
4. CD with drivers and on-
line User Guide
5. Setup Guide
Microline 420/421 & 490/491
3
1. 2.
1. Grasp tabs (1) and open access cover (2).
2. Remove printhead shipping retainer.
4
Microline 420/421 & 490/491
1. 2.
3.
1. Grasp tabs (1) and remove the paper separator.
2. Remove protective material. Replace the paper separator.
3. Remove protective material from the pull-up roller assembly (2).
Microline 420/421 & 490/491
5
1. With access cover open, grasp printhead (1) and slide to center.
2. Remove ribbon cartridge from packaging.
! Important! Leave the clear plastic ribbon shield (2) on the cartridge.
6
Microline 420/421 & 490/491
1. Hold ribbon cartridge as shown with knob (1) up and ribbon shield (2) facing platen (3).
2. Fit grooves on sides at back end of cartridge over pins on ribbon plate (4).
Microline 420/421 & 490/491
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1. Lower front of cartridge over printhead (1) until it snaps into place.
2. Turn knob (2) clockwise to take up ribbon slack.
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Microline 420/421 & 490/491
Set the headgap lever (1) for the number of sheets in the forms you are using from 1-4. Use setting 5 for
envelopes or extra-thick paper. Adjust setting for the best print quality.
Microline 420/421 & 490/491
9
1. Make sure both printer and computer are OFF.
2. Plug interface cable into printer port. Plug other end into computer.
! Parallel cable must be shielded, no longer than 6 ft (1.8m), and IEEE 1284-compatible.
Parallel USB
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Microline 420/421 & 490/491
1. 2.
1. Plug power cord into printer. Plug other end into a grounded outlet.
2. Turn the printer on. POWER light (1) comes on and ALARM light (2) comes on because paper
is not loaded.
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6
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12
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