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.
To scan a photo or document from the control panel to your computer, make sure that the computer is on, the full-feature printer driver is installed, and the HP printer is connected to the computer with a USB cable or over your local wireless network.o scan a photo or document from the control panel to your computer, make sure that the computer is on, the full-feature printer driver is installed, and the HP printer is connected to the computer with a USB cable or over your local wireless network.