Konica Minolta C-EF01 Error After Installing EM-907: Cause and Troubleshooting Guide

The Konica Minolta C-EF01 error can occur on bizhub C226i, C266i, and C286i series machines after installation of the optional EM-907 SSD.

In the field case described in this guide, updating the GC3-RE and GC2-RF firmware or reinstalling the EM-907 did not resolve the problem. According to guidance from Konica Minolta, Inc. (KMI), the issue was related to a security-policy change introduced with firmware version G00-S7 and later, which requires an administrator password change during the initial startup process.

This guide explains the reported cause, the role of the EM-907, the on-site resolution procedure, and the alternative solution recommended by KMI.

Important: The troubleshooting sequence below is based on the described service case and KMI guidance. A C-EF01 error may have other causes depending on the machine model, firmware version, hardware configuration, and installation history.

Key Takeaways

• The C-EF01 error can appear after installing an EM-907 SSD on certain Konica Minolta i-Series color MFPs.
• In the reported case, updating firmware and reinstalling the SSD did not solve the problem.
• KMI identified a connection with the administrator-password change requirement introduced with firmware G00-S7 and later.
• Completing the administrator-password setup may allow the machine to proceed normally.
• If the issue remains, KMI guidance includes updating to the appropriate G00-S7 firmware and, where necessary, changing a Service Mode setting.
• Service Mode and DipSW operations should be performed by qualified service personnel.

What Is the EM-907?

The EM-907 is an optional expansion SSD designed for Konica Minolta i-Series color multifunction printers, including models such as the bizhub C226i, C266i, and C286i.

The SSD provides additional internal storage for functions and operations that require machine storage.

Key Functions of the EM-907

1. Additional Storage

The EM-907 is described as a 256GB SSD and provides additional storage capacity for machine operations involving data processing and temporary storage.

2. Support for Optional Functions

The EM-907 is required for certain optional functions. For example, installation of the FK-513 fax kit requires the EM-907.

It is also required for the i-Option LK-116 antivirus function.

3. Data Storage for Printer Operations

Additional storage can be used for functions that require temporary data storage, including functions such as Secure Print.

The additional storage can also provide more cache space when the machine handles large files or multiple print jobs.

Why Does the C-EF01 Error Occur After EM-907 Installation?

In the reported service case, the machine displayed C-EF01 after the EM-907 installation and setup procedure.

Initially, updating the GC3-RE and GC2-RF firmware and reinstalling the SSD did not resolve the problem.

According to KMI guidance, the relevant cause was a security-policy change introduced with G00-S7 firmware and later versions.

These firmware versions require the administrator password to be changed during the initial startup process.

If the password-change procedure is not triggered or is not completed correctly, the machine may remain in an abnormal setup state and display the C-EF01 error.

Therefore, in this particular case, the problem was not simply a defective SSD.

The administrator-password setup procedure needed to be completed correctly.

Reported On-Site Troubleshooting Procedure

The following procedure describes the resolution used for the reported field case.

Step 1: Return to the Main Menu

Press the physical Home button on the machine’s operation panel to return to the main menu.

Step 2: Open the Setup Notification

Look for the warning or notification displayed in the upper-right area of the screen.

Tap the warning and select “Set Now“.

Step 3: Set the Administrator Password

The machine should prompt you to set an administrator password.

Follow the on-screen instructions and complete the password setup.

This step is important because newer firmware versions may require the administrator password to be changed during initial startup.

Step 4: Restart the Machine

After completing the password setup, the machine will automatically shut down.

Restart the machine.

In the reported case, the machine may display C-D073 during the restart process.

This does not necessarily mean that the troubleshooting process has failed.

Step 5: Complete the Storage Configuration

If required, enter Service Mode → System 2 and configure the appropriate storage setting.

Then restart the machine.

After the storage configuration is completed, the machine should return to normal operation in the reported case.

Service warning: Service Mode operations should be performed by a qualified Konica Minolta technician or other appropriately trained service personnel. The exact menu names and settings may vary according to the machine model and firmware version.

Alternative Solutions Recommended by KMI

If the on-site procedure does not resolve the C-EF01 error, KMI guidance described two additional approaches.

Solution 1: Update to the Appropriate G00-S7 Firmware

Make sure the machine has been upgraded to the applicable G00-S7 firmware.

Under normal circumstances, the machine should then prompt the administrator to change the password during startup.

Complete the password-change procedure when prompted.

This may resolve the C-EF01 condition described in this case.

Solution 2: Check DipSW176 in Service Mode

If the problem remains after the firmware update, KMI guidance indicates that the issue can be addressed by entering Service Mode and disabling bit 2 of DipSW176.

Because DipSW settings can affect machine operation, this procedure should only be performed by qualified service personnel following the appropriate service documentation for the specific machine and firmware version.

Important EM-907 Installation Notes

Different EM-907 Hardware Versions

Different hardware versions of the EM-907 may exist in the market.

For example, newer SSD hardware may use a different NAND configuration, such as a Phison 96-layer SSD version.

The corresponding machine firmware may therefore need to support the specific hardware version being installed.

Before installation, technicians should verify compatibility between the EM-907 hardware and the machine’s firmware.

The EM-907 Should Be Installed by a Technician

The EM-907 is an internal component and should be installed by an appropriately trained technician.

The installation process may involve data-copy and machine configuration procedures.

Do Not Remove the EM-907 After Data Copy

An important installation note is that once the Data Copy operation has been performed, the EM-907 should not be removed from the machine.

According to the described service information, forcibly removing the SSD after this stage can cause C-D071 and prevent the machine from booting normally.

For this reason, technicians should confirm the installation and hardware compatibility before completing the data-copy procedure.

Konica Minolta Error Codes Related to the EM-907 Installation

These error codes can appear at different stages of the installation or recovery process described above.

These relationships are based on the service case and information provided for this troubleshooting procedure. They should not be interpreted as a universal diagnosis for every occurrence of these error codes.

Frequently Asked Questions

What causes the Konica Minolta C-EF01 error after EM-907 installation?

In the field case covered by this guide, KMI associated the error with the administrator-password change requirement introduced with G00-S7 and later firmware. If the required password-change process is not triggered or completed correctly, C-EF01 may occur.

Which Konica Minolta models are covered by this issue?

The described case involves the bizhub C226i, C266i, and C286i series. The exact behavior can depend on the machine configuration and firmware version.

Is the EM-907 a hard drive or an SSD?

The EM-907 is an optional internal SSD expansion unit. The version described in this service information is a 256GB SSD.

Can I remove the EM-907 after installing it?

According to the installation information described in this case, the EM-907 should not be forcibly removed after the Data Copy operation has been completed. Doing so may result in C-D071 and a boot failure.

Does reinstalling the EM-907 fix C-EF01?

Not necessarily. In the field case described here, reinstalling the SSD and updating related firmware did not resolve the problem because the underlying issue was associated with the administrator-password setup process.

What should I do if C-EF01 remains after the firmware update?

First verify that the applicable firmware and administrator-password setup procedure have been completed correctly. If the problem remains, qualified service personnel can follow the appropriate KMI service procedure, including checking the relevant Service Mode settings.

Can users change DipSW176 themselves?

Service Mode and DipSW settings are intended for qualified service personnel. Incorrect changes may affect machine operation, so users should contact an authorized or qualified technician.

Conclusion

The Konica Minolta C-EF01 error after EM-907 installation can be related to the administrator-password setup requirement introduced with newer firmware.

For the field case documented in this article, the key step was to trigger and complete the administrator-password setup process rather than repeatedly reinstalling the SSD.

If the problem continues, the machine should be checked for the appropriate firmware version and configuration by qualified service personnel. KMI guidance described for this case also includes checking the relevant Service Mode settings.

Understanding the relationship between EM-907 installation, G00-S7 firmware, administrator-password setup, and storage configuration can help technicians diagnose this particular C-EF01 situation more efficiently.