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Make certain you have the current updated drivers for the printer. Check to see if the printer is recognized as one of the devices active and available. If its wireless, be certain the communication is both ways. Do a printer test of the Wireless transmission phase. If you connect directly by Cat5/6 cable with Ethernet, check drivers. Check cables. Check for a positive connection on both ports, Computer and Printer. Make certain the printer listed is the Main Printer when you do a setup.
This is what the service manual says:
(1) Clean the Document glass.
(2) Check the connection
between the contact sensor
and SPCNT board (JCCD1).
(3) Replace the SCANNER
(4) Replace the SPCNT board
Make sure the "Still Image Service" is running on your system. Right-click "My Computer", select "Manage", then open "Services" applet. Scroll down to the "Still Image Service", right-click it and set its properties to "Automatic", then right-click it and "Start" it.
1)right click the my computer icon 2)click properties and then click hardware n go to device manager. 3)uninstall all usb ports and then scan for hardware changes 4)ur pc will detect your printer and ask for printer drivers 5)re load drivers and your pc will communicate with your printer 6)for reloding install the cd follow the instructions on the screen and click next 7)restart when the printer is loded.connect the wires and cords properly
PIXMA MP780 "WRONG CARTRIDGE" MESSAGE? Here is what I did and it now works just fine.I turned off the printer and unplugged the power cord, and unplugged it from my computer. I then removed all the ink cartriges and removed the print Head I got some rubbing alcohol put it on some toilet paper and wiped down the back and bottom of the print head.Plugged everything back in and It now works better then ever.