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 from the HP printer and configure settings, the computer to which the printer connects needs to have the full feature HP software installed on it. Using a USB cable connect the printer to the computer, or connect the computer through a wired or wireless network. Continue Reading.