Samsung SCX-4520, SCX-4720FS List Interface MFP port, the situation of simultaneous, Scanning

Problem	Possible Cause and Solution
The machine does not	• Check if the MFP port is not busy. Since functional
appear on the scanners	components of MFP (printer and scanner) share the same
list (continued)	I/O interface (MFP port), the situation of simultaneous
	access of different “consumer” application to the same MFP
	port is possible. To avoid possible conflicts, only one of
	them at a time is allowed to gain control over the device.
	The other “consumer” will encounter “device busy”
	response. This can usually happen while starting scan
	procedure, and appropriate message box displays.
	To identify the source of the problem, you should open MFP
	ports configuration and select the port assigned to your
	scanner. MFP port's symbol /dev/mfp0 corresponds to LP:0
	designation displayed in the scanners’ options, /dev/mfp1
	relates to LP:1 and so on. USB ports start at /dev/mfp4, so
	scanner on USB:0 relates to /dev/mfp4 respectively and so
	forth sequentially. In the Selected port pane you can see if
	the port is occupied by some other application. If this is the
	case, you should wait for completion of the current job or
	should press Release port button, if you are sure that the
	present port's owner is not functioning properly.
The machine doesn’t	• Check if a document is loaded into the machine.
scan	• Check if your machine is connected to the computer. Make
	sure if it is connected properly if I/O error is reported while
	scanning.
	• Check if MFP port is not busy. Since functional components
	of MFP (printer and scanner) share the same I/O interface
	(MFP port), the situation of simultaneous access of
	different “consumer” application to the same MFP port is
	possible. To avoid possible conflicts, only one of them at a
	time is allowed to gain control over the device. The other
	“consumer” will encounter “device busy” response. This
	can usually happen while starting scan procedure, and
	appropriate message box will be displayed.
	To identify the source of the problem, you should open MFP
	ports configuration and select the port assigned to your	9
	scanner. MFP port’s symbol /dev/mfp0 corresponds to LP:0
	designation displayed in the scanners’ options, /dev/mfp1
	relates to LP:1 and so on. USB ports start at /dev/mfp4, so
	scanner on USB:0 relates to /dev/mfp4 respectively and so
	forth sequentially. In the Selected port pane you can see if
	the port is occupied by some other application. If this is the
	case, you should wait for completion of the current job or
	should press Release port button, if you are sure that the
	present port’s owner is not functioning properly.

TROUBLESHOOTING 9.29