How to fix missing dots in printouts with my Oki ML5520?
- Rrichard69Sep 12, 2025
If you are seeing dots missing in your printouts from your Oki printer, the head gap may not be set correctly. Try moving the headgap lever.

How to fix missing dots in printouts with my Oki ML5520?
If you are seeing dots missing in your printouts from your Oki printer, the head gap may not be set correctly. Try moving the headgap lever.
Why does continuous form paper stick to the sheet guide on my Oki ML5520?
In cold, dry weather, static charges can build up and cause continuous form paper to cling to the sheet guide on your Oki printer. Try moving the paper guides together so that the paper rests on the guides rather than on the separator.
Why don't the Print Quality and Character Pitch keys on the front panel of my Oki ML5520 work?
The Print Quality and Character Pitch keys on the front panel of your Oki printer might not work because the Operator Panel Function in the printer menu can be used to disable these buttons (Limited Function). If the printer is part of a customized system or used by multiple people, the system manager may have disabled these buttons to ensure the printer is always set properly. Check with your system manager before changing any menu settings.
| Printer Type | Dot Matrix |
|---|---|
| Print Width | 136 columns |
| Connectivity | Parallel, USB |
| Resolution | 240 x 216 dpi |
| Noise Level | 55 dB |
| Emulation | Epson FX |
| Paper Handling | tractor feed |
| Paper Size | A4, Letter, Custom |
| Number of Pins | 24 pins |
Explains the meaning of NOTE, CAUTION!, and WARNING! messages.
Overview of the user's guide and related support materials.
Guidelines for printer placement, unpacking, and initial setup.
Safety and handling advice for ribbon cartridges.
Step-by-step instructions for connecting power and turning the printer on safely.
Procedures for safely disconnecting and turning off the printer.
Instructions for connecting the printer via parallel and USB cables.
Introduction to printer tests: Font Sample, Rolling ASCII, Hexadecimal Dump.
Instructions for installing drivers and information on printer emulations.
Utilities for viewing printer status and setting the Top of Form position.
Identifies components and instructions for rear feed paper loading.
Steps to load continuous forms paper from the front of the printer.
Instructions for loading single sheets of paper using the top feed.
How to set the starting position for printing on each page.
Explains how to use the feature to tear off continuous forms cleanly.
Detailed steps for setting TOF with Forms Tear-Off enabled or disabled.
How to adjust TOF for one page and reset TOF to factory defaults.
Step-by-step guide to enable and configure the Forms Tear-Off feature.
Procedures for manual tear-off, paper parking, and changing paper paths.
Instructions for switching from single sheets back to continuous forms.
How to adjust printhead gap and select print quality modes for specific models.
How to select print quality modes and configure character pitch.
How to reset the printer and change emulation modes.
How to enter, exit, reset, and print menu settings.
How to print all settings, change specific settings, and control access.
Details on Emulation Mode, Print Mode, Draft Mode, Pitch, Spacing, Style, and Size.
Detailed instructions for replacing the ribbon cartridge and handling precautions.
How to clean the printer's exterior casing and internal housing.
Steps to resolve paper jams occurring in the rear feed path.
Identifies causes and solutions for recurring rear feed paper jams.
Procedures to clear paper jams when using single sheets.
Basic checks for common issues like no printing, incorrect symbols, or connection problems.
Information on how to identify and purchase printer parts and accessories.
Details on model, print method, dimensions, weight, power, and environmental requirements.
Contact details for OKI offices globally for sales, support, and inquiries.