Oki MC-860 / CX2633MFP

Questions and Answers

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Kathleen HayesOct 30, 2025
How to fix light prints in all colors on Oki MC-860 / CX2633MFP?
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  reynoldsjessicaOct 30, 2025
  If your Oki All in One Printer is producing light prints in all colors, here are a few things you can try: * Perform initial actions from maintenance procedures. * Verify that the media you're using is supported by the printer and that the media settings are correct at the control panel. * Print the ID Check Pattern and Demo page to see if the problem is application-specific. * Perform isolation test prints. * Remove the imaging units and the transfer unit, then check for toner contamination on the high-voltage contacts. Also, check if the LED heads are dirty and clean them with a lint-free cloth. Inspect the wiring harnesses on the LED heads for damage and proper seating; repair or replace them if necessary. Finally, inspect the high-voltage wiring harness and reseat it. If th...
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victoriamcdonaldNov 5, 2025
Why is my Oki MC-860 / CX2633MFP All in One Printer printing unexpected colors?
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  Melanie VaughnNov 5, 2025
  If your Oki All in One Printer is printing unexpected colors, first perform the initial actions from maintenance procedures. Verify that the media used is supported and that the media settings are correct at the control panel. Print the ID Check Pattern and Demo page to check for application issues. Perform isolation test prints. If the colors on the test pages match your expectations, the issue lies with your application. If not, check the imaging unit life remaining on the configuration page; replace the imaging unit if it's near its maximum image count. Inspect the LED head for debris and clean it with a dry, lint-free cloth if necessary. Reseat the wiring harness if the wiring harnesses on the LED heads are undamaged, properly routed and seated. If a single color is problematic, try s...
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Mrs. Christine Mccarthy MDNov 9, 2025
What to do if my Oki All in One Printer prints light in only one color?
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  Patricia KlineNov 10, 2025
  If your Oki All in One Printer is printing light in only one color, start by performing the initial actions from maintenance procedures. Print the ID Check Pattern and Demo page. Perform isolation test prints. Make sure the toner cartridge pull strip is completely removed from the affected color. If the problem can be isolated to one primary color after printing the 100% Solid Fill test print, replace the toner cartridge. Check the LED heads for dirt and clean them with a lint-free cloth if needed. Also, remove the imaging units and the transfer unit to check for toner contamination on the high voltage contacts, and clean the contacts. Swap the LED head of the problem color with any other LED Head and print a Solid Fill Test Pattern. Replace the LED Head, if needed. Reseat the wiring harn...
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Jason MirandaNov 14, 2025
How to troubleshoot blank prints on my Oki All in One Printer?
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  floresdavidNov 15, 2025
  If your Oki All in One Printer is producing blank prints, begin by performing the initial actions from the maintenance procedures. Perform isolation test prints to determine if the issue lies between the CU Board and the PU Board. If the entire test print is blank, verify the application and printer settings. Remove the toner cartridge and check for toner starvation inside the imaging unit; replace the toner cartridge if there is evidence of toner starvation. Also, check if the LED heads are dirty and clean them with a lint-free cloth. Inspect the wiring harnesses on the LED heads for damage and proper seating; repair or replace them if necessary. Inspect the high-voltage wiring harness and reseat it. If the problem persists, replace the transfer unit, LVPS, imaging unit sensor board, HVP...
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Savannah ClarkNov 19, 2025
Why are color layers not correctly registered on my Oki MC-860 / CX2633MFP All in One Printer?
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  monroenicoleNov 19, 2025
  If the color layers on your Oki All in One Printer are not correctly registered, start by performing the initial actions from maintenance procedures. Verify that the media used is supported and that the media settings are correct at the control panel. Print the ID Check Pattern and Demo page to check for application problems. Perform isolation test prints. Run the Color Registration Error Correction Test. Cycle power to the printer. Inspect the color registration sensors for dirt, debris, or toner build-up and clean the sensors if necessary. Check the color registration shutter and run the Service Diagnostics Registration Shutter test; replace the solenoid or harness if the shutter isn't functioning correctly. Inspect the transfer unit for tears or damage on the edges of the belt and repl...
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Janice KeyNov 24, 2025
What causes mottled or splotchy prints on an Oki MC-860 / CX2633MFP All in One Printer?
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  Garrett JohnsonNov 25, 2025
  Mottled or splotchy prints on your Oki All in One Printer can occur due to low humidity or when printing on heavy weight media. Perform the initial actions from maintenance procedures. Ensure the media is approved and the control panel and driver settings match the loaded media. Try different media to verify consistent, reproducible problem. Verify the media used is supported by this printer and that the media settings are correct at the control panel. Print the ID Check Pattern and Demo page to see if it is an application problem. Perform isolation test prints. Print the configuration page to verify the operating environment, noting that low humidity (less than 20% relative humidity) can cause mottling. Check for toner contamination on the high voltage contacts after removing the imaging...

Summary

Printer Maintenance Procedures

Exterior Cleaning

Step-by-step cleaning instructions for the printer's exterior.

Cleaning the LED Lens Array

Procedure for cleaning the LED lens array component.

Cleaning the Pickup Roller

Steps to clean the pickup rollers for paper feeding.

Cleaning Inside the Printer

Detailed steps for internal printer cleaning procedures.

Cleaning the ADF and Scanner

Instructions for cleaning the Automatic Document Feeder and scanner.

Service Menus and Adjustments

How to Enter the Service Menu

Guide on accessing the printer's service menu.

Service Maintenance Menu Overview

Overview of the different service maintenance menu options.

System Maintenance

Procedures for system-level maintenance and configuration.

Panel Maintenance

Maintenance procedures for the printer's control panel.

Scanner Maintenance

Procedures for maintaining the scanner unit.

Fax Maintenance

Maintenance and configuration settings for fax functionality.

Printer Maintenance

Maintenance tasks related to the printer engine and its components.

Initialization Functions

Functions for initializing various settings and data.

Troubleshooting Print Quality

Print Quality Problems Overview

General overview of print quality issues and their causes.

Using New Consumable Units for Testing

Utilizing new consumables for print quality diagnosis.

Analyzing Test Pages

Key observations when analyzing test print results.

Print-Quality Troubleshooting

Step-by-step troubleshooting for print quality issues.

Troubleshooting Paper Feed

General guide for troubleshooting paper feeding problems.

Troubleshooting Error Codes

Self Diagnostic Error Codes

List of diagnostic error codes and their remedies.

Oki MC-860 / CX2633MFP Specifications

General

Functions	Print, Copy, Scan, Fax
Printing Color	Color
Print Resolution	1200 x 1200 dpi
Scanner Type	Flatbed, ADF
Scanner Resolution	600 x 600 dpi
Copy Resolution	Up to 600 x 600 dpi
Fax Capability	Yes
Fax Transmission Speed	33.6 Kbps
Duplex Printing	Yes
Printer Type	Multifunction
Print Technology	Laser
Connectivity	Ethernet
Interface	USB 2.0
Operating System Compatibility	Windows, Mac