Cause of error code CHECK OUTPUT DEVICE alternates with CLOSE OUTPUT DELIVERY PATH

The optional output device is not properly connected to the printer.

Solution for error code CHECK OUTPUT DEVICE alternates with CLOSE OUTPUT DELIVERY PATH

1. Ensure the optional output device is fully seated and properly installed. 2. Check any doors on the output device and verify they are closed.  For 5si, 8000, 8100 series make sure C-link cable is correctly hooked up.