Lexmark C790 manual Unsupported option in slot, Parallel port x disabled, Serial port x disabled

55 Unsupported option in slot [x]

1Turn the printer off.

2Unplug the power cord from the wall outlet.

3Remove the unsupported option card from the printer system board, and then replace it with a supported card.

4Connect the power cord to a properly grounded electrical outlet.

5Turn the printer back on.

56 Parallel port [x] disabled

Try one or more of the following:

•Touch Continue to clear the message.

The printer discards any data received through the parallel port.

•Make sure the Parallel Buffer menu item is not set to Disabled.

56 Serial port [x] disabled

Try one or more of the following:

•Touch Continue to clear the message.

The printer discards any data received through the serial port.

•Make sure the Serial Buffer menu is not set to Disabled.

56 Standard USB port disabled

Try one or more of the following:

•Touch Continue to clear the message.

The printer discards any data received through the USB port.

•Make sure the USB Buffer menu item is not set to Disabled.

56 Standard parallel port disabled

Try one or more of the following:

•Touch Continue to clear the message.

The printer discards any data received through the parallel port.

•Make sure the Parallel Buffer menu item is not set to Disabled.

56 USB port [x] disabled

Try one or more of the following:

•Touch Continue to clear the message.

The printer discards any data received through the USB port.

•Make sure the USB Buffer menu is not set to Disabled.

Troubleshooting

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