Canon Color imageCLASS LBP712Cdn imageCLASS LBP712Cdn User Guide - Page 560
White Spots Appear, Are you using paper that has absorbed moisture?
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Troubleshooting ● If you select and use the machine in an environment with low humidity, printed images or text may be smudged. Has color mismatch correction or hue correction been performed properly? ● If the effect of the color mismatches or color streaks (lines) is unacceptably strong, perform calibration. Correcting Color Mismatch and Hues(P. 581) White Spots Appear Are you using paper that has absorbed moisture? ● Replace with appropriate paper. Loading Paper(P. 38) Are you using appropriate paper? ● Check usable paper, and replace with appropriate paper. Paper(P. 621) Loading Paper(P. 38) Is it time to replace the toner cartridge? ● Materials inside the toner cartridge may have deteriorated. Replace the toner cartridge. How to Replace Toner Cartridges(P. 571) Is the central area of high-density characters or lines left unprinted? ● Change the setting of . The improvement effect is stronger with than with . Special Image Mode(P. 424) ● The stronger the improvement, the lower the print density. 554