Coombs' test involves taking a blood sample which is checked for the presence of antibodies which may destroy red blood cells.
You can use the HP Print and Scan Doctor to test the status of the printer spooler, print queue, device manager, and device conflicts. 1  On the desktop, double-click the HP Print and Scan Doctor icon to open the tool. 2  Click Start on the Welcome screen. 3  Select your printer, and then click Next.  Click Fix Printing.
First try scanning using HP Scan on the Mac. If that option is unsuccessful, try scanning from the printer's control panel. Method one: Scan using HP Scan. Follow these steps to scan from the computer using the HP Scan software.