User's Manual
C651
Getting started
Safety precautions
General cautions
Cautions
External sensing function
Preface
Trademarks/Copyrights
About this manual
About the description
How to use the Online Manual
Screen description
How to use the table of contents
How to use the search function
Printing the topic
Features of this machine
Preparations and connecting this machine to your PC
Installation
Installation environment
Installation space
Unpacking
Checking the accessories
Installing the starter toner cartridge
Installing optional accessories
Installing the wireless LAN module
Installing the extended wired LAN module
Installing the expansion tray unit
Installing the dedicated caster stand
Connecting the power cord
About the power supply
Connecting the power cord
Loading paper in the tray
Connecting via a wired LAN
1. Connecting the LAN cable
2. Setting the IP address, etc.
3. Checking the connection from a PC
Connection form via a wireless LAN
Connecting via an access point (Infrastructure)
1. Enabling the wireless LAN function
2. Enabling infrastructure
3. Setting the IP address
4. Connecting with the wireless access point
4-1. Connecting with WPS
4-2. Connecting by selecting a wireless LAN access point
4-3. Manual setup and connection
5. Choosing a valid default gateway
6. Checking the connection from a PC
Connecting directly with this machine (Wi-Fi Direct)
1. Enabling the wireless LAN function
2. Enabling Wi-Fi Direct
3. Connecting with a device
Connecting via USB
Installing software on your PC
For Windows
For macOS
Setting the printer driver
Basic operations
Parts identification
Front
Inside the main unit
Back
Turning the power on/off
Turning the power on
Turning the power off
Loading paper
Procedure for loading paper
Applicable paper
Inapplicable paper
Paper precautions by type
Paper applicable to each tray
Loading paper in Tray 1
Loading paper in Tray 2/3/4 (Optional)
Loading paper in the MP tray
Setting paper information on the operator panel
Storing paper
Setting the output bin
Output tray
Rear output tray
Checking the information of this machine
Printing the menu map (configuration)
Confirming on the operator panel
How to use levers L1 and L2
Changing settings from the operator panel
Parts identification of the operator panel
Adjusting the display orientation
Inputting text
Changing settings
Setting menu display
Setting with the shortcut menu (Fn key)
Adjusting the buzzer volume
Setting the power save function
Setting the time that elapses before entering the power save mode
Setting the time that elapses before entering the sleep mode
Setting the Sleep After Printing mode
Restrictions of the power save function
Turning off the power automatically (Auto Power Off)
Setting the time that elapses before entering the Auto Power Off mode
Menu items
Print From USB Memory
Configuration
Print Information
Print
Menus
Easy Setup
Admin Setup
Print Statistics
Calibration
User Account Info
AirPrint
Wireless(Infrastructure) Setting
Wireless(Wi-Fi Direct) Setting
Boot Menu
Printing from a PC
Printing from a PC
For the Windows PCL printer driver
For the Windows PS printer driver
For macOS
Screens and functions of the printer driver
For the Windows PCL printer driver
For the Windows PS printer driver
macOS printer driver
How to open [Devices and Printers]
Printing on various types of paper
Printing on envelopes
Printing on labels
Printing on long paper
Printing on irregular paper (Custom)
Printing methods
Printing one sheet at a time manually
Enlarging/Reducing to fit the specified paper size
Printing by enlargement/reduction
Printing only the cover from another tray
Booklet printing
Printing a poster by dividing a document
Printing with text watermarks (Watermarks)
Printing overlaid text or logos (Overlay printing)
Outputting to a file without printing on paper
Printing frequently used documents without using a PC
Printing an email attachment
Printing in economy mode
Printing on both sides of paper
Printing in the toner save mode
N-in-1 printing
Printing as an image (Image)
Color setup
Printing color data in monochrome
Color matching in the printer driver
Simulating print results
Printing with color separation
Adjusting registration manually
Adjusting the density manually
Adjusting the color balance (density)
Changing the Mono-Print Mode
Adjustment with utilities
Color Density Settings
Refining your finishing
Printing sharper photos
Printing with the specified print resolution
Printing by correcting fine lines
Printing by specifying the font to use
Changing black finishing
Blurring white streaks between text and background (black overprint)
Inconspicuous white streaks in color superposition (trapping function)
Low Coverage Mode Settings
Useful functions
Printing with multiple pages sorted into one complete set (Collate pages)
Printing from the last page of your document
Printing by automatically selecting a tray for the specified paper
Switching tray automatically at running out of paper
Changing the default settings of the printer driver
Printing with frequently used settings registered in the printer driver
Printing data stored in this machine
Printing data from a USB memory
Printing QR codes or barcodes
Printing PS errors
Editing margins
Correcting the print position of the tray
Printing with security enhanced
Printing with print data encrypted
Updating the printer key for encrypting the print job
Printing with print data encrypted and password set (Private Print)
Canceling the printing
Management of this machine
Admin Password
Checking the factory default admin password
Inputting the factory default admin password
Changing the admin password
Changing settings of Admin Setup
Managing the machine from the web page
Opening the web page
Logging in as an administrator
Changing the admin password (Web page)
Checking/Changing the state of this machine
Saving configurations
Communication encryption (SSL/TLS)
Disabling HTTP
Using IPP
Communication encryption (IPSec)
Using the access control function (IP filter) with the IP address
Using the access control function with the MAC address
Notifying errors via e-mail
Using SNMPv3
Using IEEE802.1X (Wired LAN)
Setting IEEE802.1X (Wireless LAN)
Connection to a wireless LAN (WPA/WPA2-EAP/WPA3-EAP)
Setting the LDAP server
Setting e-mail receiving (Web page)
Setting the Power Save Time (Web page)
Setting the sleep time (Web page)
Setting the Sleep After Printing mode (Web page)
Setting Auto Power Off (Web page)
Copying the setup information of this machine to other devices
Printing PDF/JPEG files (Direct Print)
Setting a link to the support page
Setting items of the web page
User restriction (Access control)
1. Registering a role
2. Registering a user
3. Registering a group
4. Setting the authentication server
5. Enabling access control
Logging into this machine
Printing from a PC
Registering IC card information
Initializing the settings
Initializing network settings
Initializing the flash memory
Initializing settings of this machine
Moving/Transporting this machine
Moving this machine
Transporting this machine
Disposal
Useful software
Software list
Windows software
macOS software
Applications for mobile devices
Installing software
For Windows
For macOS
For mobile devices
Monitoring Tool (Windows)
Registering the printer
Updating the software
Updating the printer’s firmware
Changing settings of Monitoring Tool
Deleting the printer
Troubleshooting (Monitoring Tool)
Color Swatch Utility
Printing a color sample
Customizing the color sample
Printing a file in your desired color
Color Correct Utility
Changing palette colors
Changing gamma values and hues
Printing with tuned color settings
Saving color tunning settings
Importing color tunning settings
Deleting color tuning settings
PS Gamma Adjuster Utility
Registering a gamma curve name
Printing with registered halftone
Configuration Tool
Registering this machine
Starting the Configuration Tool
Checking the state of this machine
Displaying print completion on the PC
Registering ICC profiles
Registering forms (Form overlay)
Checking free space of memory/hard disk
Registering the user name and password
Deleting this machine
Name and function of each screen
Icon description
OKI LPR Utility
Starting the OKI LPR Utility
Registering this machine with the OKI LPR Utility
Checking the state of the registered machine
Transferring print data to the registered device
Printing the same document from multiple registered devices
Opening the web page of a registered device
Automatically following the IP address of the registered device
Setting the port number of the web page for the registered device
Sending files to this machine registered with the OKI LPR Utility
Deleting unnecessary print data
Uninstalling OKI LPR Utility
Print Job Accounting Client
For Windows
For Mac OS
Network Status Monitor
Starting the Network Status Monitor
Checking the state of this machine
Displaying print completion on the PC
Printer Supply Manager
Installing
Registering the printer
Setting the notified party for notifications about consumables/maintenance parts
Setting the notified party for notifications about consumables/maintenance parts (E-mail Address)
Periodical notification of the usage status of consumables/maintenance parts
Notification based on the usage status of consumables/maintenance parts
Printing from a mobile device
Printing with Mobile Print
Printing by connecting to an access point
Printing with the NFC function
Troubleshooting for Mobile Print
Printing with AirPrint
1. Setting AirPrint
2. Registering this machine on Mac
3. Printing with AirPrint
Troubleshooting for AirPrint
Printing with Mopria Print Service
1. Setting Mopria Print Service
2. Registering this machine with a Windows
3. Printing with Mopria Print Service
Troubleshooting for Mopria Print Service
Printing with IPP Everywhere
1. Setting IPP Everywhere
2. Registering this machine with Chromebook
3. Printing with IPP Everywhere
Troubleshooting for IPP Everywhere
Printing with Print Plugin
Printing by connecting to an access point
Troubleshooting for Print Plugin
Showing troubleshooting tips on a mobile device
Maintenance
Precautions for replacing consumables
Service life and replacement cycle of consumables
Toner cartridge
Image drum
Replacing the black (K) toner cartridge and the waste toner box
Replacing the toner cartridge (C/M/Y)
Replacing the image drum
Service life and replacement cycle of maintenance parts
Belt unit
Fuser unit
Replacing the belt unit
Replacing the fuser unit
Cleaning the main unit and the parts
Cleaning the LED head
Cleaning the surface of the main unit
Cleaning the paper feed roller (Tray 1/2/3/4)
Cleaning the paper feed roller (MP tray)
Cleaning the light-shielding film
Cleaning the resist roller
Updating software
For Windows
For macOS
Deleting software
Uninstalling the Windows printer driver
Uninstalling the macOS printer driver
Firmware update
For Windows
For macOS
Troubleshooting
When an error message appears on the display
Error message list
When a paper jam occurs
For the error code 370 or 371
For the error code 372
For the error code 380
For the error code 381
For the error code 382 or 385
For the error code 390
For the error code 391, 392, 393 or 394
For the error code 638
Trouble with printing
I cannot print
Troubleshooting for wired LAN connection
Troubleshooting for wireless LAN connection
Troubleshooting for USB connection
Troubleshooting for printing results
List of troubles with printing results
White streaks appear in the vertical direction
Printing is faint in the vertical direction
Printing is light
White dots or lines appear
Condensation occurs on printed paper
Streaks appear in the vertical direction
Dots and horizontal streaks appear in the paper feeding direction periodically
White area is lightly stained
Edges of text are blurred
When envelopes or coated paper is printed, the whole area is thinly stained
Toner comes off when rubbed
Specks appear on glossy paper
Point stains appear
Stains are printed
The entire paper is printed in black
Nothing is printed
White streaks occur
The peripheral area is dirty
The color of images does not come as expected
An afterimage printed on the front edge of the paper is printed
Printout edges are light in color
Software troubleshooting
Troubleshooting for this machine and paper
Troubleshooting for the machine
Troubleshooting for the paper
When a power failure occurs
Taking security measures
Preventing disclosure of documents
Private Print
Print Data Encryption
Encrypting Network Communications
Preventing unauthorized network access
IP Filtering Setup
MAC Filtering Setup
IPSec Setup
TLS Setup
IEEE802.1X Settings
Access Log
Preventing disclosure of confidential information in the operation of this machine
Password Policy
Account Lockout
Admin password
User Authentication/Access Control
Initializing the settings
Erase Privacy Data
MIB Get Control
Security-related menu settings
Handling of Personal Information
Appendix
Specifications
Regulatory wireless LAN statements
Dimensions
Using the FAQ guide of this machine
Contact us
Menu tree
Search results
Search Options
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Case Sensitive
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