72 TroubleshootingError Message Appears on the Screen Writing Error/Output Error/Communication ErrorCause ActionThe machine is not ready. Confirm that the POWER lamp is lit.If the POWER lamp is off, turn the machine on.While the POWER lamp is flashing green, the machine is initializing. Wait untilthe POWER lamp stops flashing and remains lit green.If the Alarm lamp is lit orange, an error may have occurred in the machine.For details on how to resolve the error, see “Error Message Is Displayed on theLCD” on page 57.Paper is not loaded. An out of paper error may have been left unattended for a period of time.Load paper and press the OK button.If paper is loaded, make sure that the paper source (the Auto Sheet Feeder orFront Feeder) is selected correctly. If the paper source is not selected correctly,press the Paper Feed Switch or use the printer driver to change the papersource.Printer port setting does not match thecomputer’s interface connecting themachine.Check the printer port settings.(1)Click Start > Control Panel > Printers and Other Hardware > Printers andFaxes.In non-XP Windows, click Start > Settings > Printers.(2)Click the Canon MP510 Printer icon.(3)Open the File menu and select Properties.(4)Click the Ports tab to confirm the port settings.Make sure that a port named USBnnn (Canon MP510 Printer) (where n is anumber) is selected for Print to the following port(s).In Windows Me or Windows 98, click the Details tab and make sure thatMPUSBPRNnn (Canon MP510 Printer) is selected for Print to thefollowing port.If the port setting is not correct, change the port setting according to theinterface you are using, or reinstall the MP Drivers.The machine is not connected properly. Make sure that the printer cable is securely plugged in to the machine and thecomputer.z If you are using a relay device such as a USB hub, disconnect it, connect themachine directly to the computer, and try printing again. If printing startsnormally, there is a problem with the relay device.Consult the reseller of the relay device for details.z There could also be a problem with the USB cable. Replace the USB cableand try printing again.MP Drivers are not installed properly. The MP Drivers may not be installed properly. Uninstall them following theprocedure described in the Printer Driver Guide on-screen manual and reinstallthem following the procedure described in the Easy Setup Instructions.