DC500 4K FUSER B Mode Explained – When and Why to Use It

The DC500 4K FUSER includes a selectable B Mode, which is designed to improve display compatibility under specific conditions. From a factory engineering perspective, B Mode is not a performance mode and should not be treated as a default operating state. It exists to address monitor signal acceptance issues, especially during installation and initial signal negotiation.

Understanding when and why to use B Mode helps avoid unnecessary troubleshooting and reduces the risk of misinterpreting normal device behavior as a fault.

What Is B Mode Used For?

B Mode applies an alternative output timing profile during the fuser’s startup and signal output process. In practical terms, this mode is intended for situations where:

- The monitor remains black even though the DC500 4K FUSER shows all indicator LEDs on

- The display previously operated at high refresh rates or custom resolutions

- The monitor fails to correctly lock onto the default output timing

- Standard reset and power-cycle procedures do not restore video output

Factory test data shows that certain monitors are more sensitive to initial timing parameters, especially during the first handshake after power-on. B Mode provides a more conservative output behavior to improve compatibility.

How to Switch to B Mode

To switch the DC500 4K FUSER to B Mode:

- Press and hold the K1 button for 5 seconds

- Release the button

- Wait approximately 20 seconds for the device to complete its automatic reboot

Once the reboot finishes, the fuser will operate in B Mode until changed again.

When B Mode Should Be Used

B Mode is recommended as a diagnostic and compatibility tool, not as a permanent setting unless required by the monitor. If normal display output is restored after switching modes, the issue is typically related to monitor timing acceptance rather than device malfunction.

If display problems persist even in B Mode, further investigation into resolution limits, refresh rate behavior, or monitor EDID characteristics is required and should be addressed separately.

Using B Mode correctly allows users to isolate display compatibility issues efficiently and maintain stable operation of the DC500 4K FUSER.