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. Printing Area Print Quality is Poor or Contains Errors 132 Troubleshooting Troubleshooting n Print the nozzle check pattern to check the ink output. If a specific colour does not print in the nozzle check pattern, clean the print head. a Printing the Nozzle Check Pattern a Print Head Cleaning The problem can also be resolved by aligning the print head. For details on print head alignment, refer to "Straight Lines are Misaligned". Print Quality is Poor or Contains Errors 133 Troubleshooting Troubleshooting n Increase the print quality setting in the printer driver settings. Windows 1 Open the Printer Properties dialog box. 2 On the Main tab, click High for the Print Quality setting. Macintosh 1 Open the Print dialog box. 2 For Print Mode, select Manual and then click Details. 3 Click the Quality icon and then drag the Print Quality slide bar to the Fine end. Print Quality is Poor or Contains Errors 134 Troubleshooting Troubleshooting Set the halftoning method to Diffusion in the printer driver settings. Windows 1 Open the Printer Properties dialog box. 2 On the Main tab, select Custom for the Print Quality setting, and click Set. 3 Click Diffusion for the Halftoning setting. Macintosh 1 Open the Print dialog box. 2 For Print Mode, select Manual and then click Details. 3 Click the Quality icon and then click Diffusion for the Halftoning setting. Print Quality is Poor or Contains Errors 135 Troubleshooting Troubleshooting • Printing Does Not Start • Printing Stops Before It is Completed • Printer Moves But Does Not Print • Print Head Holder Does Not Move to the Centre Printer Does Not Start or Stops During Print Jobs 136 Troubleshooting Troubleshooting n Ensure the printer is turned on. If the POWER lamp is off, press the POWER button. If the POWER lamp is flashing green, the printer is initialising. Wait until the POWER lamp stops flashing. Note . When printing a large amount of data such as a photo or graphics, it takes longer than usual to begin printing. While the POWER lamp is flashing, the computer processes the data and sends it to the printer. Simply wait until the processing is completed. n Ensure the printer is securely connected to the computer. Note . If you are using a switch box or other device, remove and reconnect the printer directly to the computer. Try printing again. If printing is now successful, there may be a problem with the device. Also there could be a problem with the cable(s). Replace the cable(s) and try printing again. Printer Does Not Start or Stops During Print Jobs 137 Troubleshooting ¦ Ensure the correct printer driver is selected. In Windows, ensure that Canon S820 is selected in the Print dialog box. In Macintosh, ensure that S820 is selected in the Chooser. Note a In Windows, you can set the Canon S820 as the default printer. n Ensure the printer port is set correctly. Windows If using a parallel interface printer cable, set "LPT1" as the printer port. If using a USB cable, set "USBPRNnn" or "USBnnn" ("n" represents a number) as the printer port. 1 Open the Printer Properties dialog box from the Start menu. . Opening the Printer Properties dialog box directly from the Start menu 2 Click the Details tab (or Ports tab) and set the printer port. Printer Does Not Start or Stops During Print Jobs 138 Troubleshooting Troubleshooting ¦ Check the status of the POWER lamp. When the POWER lamp is flashing green, the printer is processing data. Printing a large amount of data such as a photo or graphics takes time for the computer to process the data, during which the printer may appear to not be functioning. In addition, when continuously printing material that uses a large amount of black ink on plain paper, the printer will sometimes pause. In either case, simply wait until the processing is completed. ¦ Halt the print job and turn the printer off for at least 15 minutes to cool the print head down. The print head can overheat when continuously printing for long time. To protect the print head, the printer will sometimes pause automatically at a line break before resuming. In this event, interrupt the print job at a convenient time and turn the printer off for at least 15 minutes. Furthermore, when continuously printing graphics or photos with intense colours, printing may stop to protect the print head. In this case, printing will not resume. Turn the printer off and wait for at least 15 minutes. Caution . Inside the printer, the area around the print head can become extremely hot. Do not touch the print head or nearby components. Printer Does Not Start or Stops During Print Jobs 139 Troubleshooting Troubleshooting n Check the ink tanks. If empty, replace them. n Ensure that the ink tanks snap into place when you install them. n If there is plenty of ink but the printer does not print, clean the print head. After cleaning the print head, print the nozzle check pattern to check that ink is being output normally. a Print Head Cleaning a Printing the Nozzle Check Pattern If the pro...