Lexmark C748 User's Guide - Page 224

Troubleshooting 224 55 Unsupported option in slot [x] 1 Turn the printer off. 2 Unplug the power cord from the wall outlet. 3 Remove the unsupported option card from the printer system board, and then replace it with a supported card. 4 Connect the power cord to a properly grounded electrical outlet. 5 Turn the printer back on. 56 Parallel port [x] disabled Try one or more of the following: • Select Continue to clear the message. For non‑touch‑screen printer models, press The printer discards any data received through the parallel port. • Make sure the Parallel Buffer menu is not set to Disabled. to confirm. 56 Serial port [x] disabled Try one or more of the following: • Select Continue to clear the message. For non‑touch‑screen printer models, press The printer discards any data received through the serial port. • Make sure the Serial Buffer menu is not set to Disabled. to confirm. 56 Standard USB port disabled Try one or more of the following: • Select Continue to clear the message. For non‑touch‑screen printer models, press The printer discards any data received through the USB port. • Make sure the USB Buffer menu is not set to Disabled. to confirm. 56 USB port [x] disabled Try one or more of the following: • Select Continue to clear the message. For non‑touch‑screen printer models, press The printer discards any data received through the USB port. • Make sure the USB Buffer menu is not set to Disabled. to confirm.