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Turn the x4500 upside down on the table, the adf unit hangig over the tables edge
loosen the 7 BIG screws on the bottom, which hold the metallic box
lift the metallic part up a bit, disconnect the groundscrew, the blue, red an mixed mini connector on the long side and the usb and the power connector on the short side (this one ist to disconect, with something getting under it an slightly pressure).
the the metallic box is separated and can be put on the table just lie the scanner before hangig over the edge.
there a two scres from the front an some 5 or so, from the top (which is originally the bottom...)
now turn the box upside down and open it.
Here we are, you see the harddrive, the cpu, everything.
Usually that's a network problem, try doing a factory default of the network base hold the right and the check button "go" button til you see the menu for maintenance then look for network restore part, do a factory default of the network and then restart the scanner again after the printer starts up again
Turn the power on and immediately press 1 or 2 repeatedly.Continue until the following message appears:Press the # button to perform disk maintenance (35+ minutes). Otherwise,press the green start button to continue.
Press # to begin the disk refresh process.This process may take as more than 30 minutes, but frequently only takes 10-15minutes. A message will appear on the screen indicating the refresh is in progress.
If problem continues:
Try dial **411
Select 4 MFP settings
Select 1 Restore Factory Defaults
If still problem continues, I strongly suggest you contact Lexmark technical support or an authorized service provider for further assistance. Thank you for choosing Lexmark.