Lexmark C750 Service Manual - Page 187

5060-00x d. Turn on the printer and note the new error codes. If an automatic calibration begins, 36 Printer Service Required may appear. The printhead and RIP board are working correctly and the printhead cable connections should be checked. Press Go to clear the error. • If the error code remains the same, replace the RIP board. If that solves the problem, you are finished. • If the printer displays a different printhead error code, which indicates another color, the printhead or the printhead cables are defective. See the table below for printhead codes. For example, the printer originally displays the printhead error code 108 (yellow). After switching the signals using the diagnostic tool, the printer displays the printhead error code 106 (cyan). Printhead error codes Yellow For 10x errors For 11x errors For errors 169-175 Not commonly seen 108 117 175 176 Cyan 106 115 171 172 Printhead error codes Magenta 107 116 173 174 Black (K) 109 114 169 170 • 4. Remove the printhead diagnostic tool. 5. The problem is in either the printhead cables or the printhead. Replace the printhead cables. 6. If the problem remains, replace the printhead. Perform the printhead adjustments. Print quality defect locator chart The print quality locator chart is copied below, but the tool is a transparent sheet available with this printed book. Use the tables and rulers to determine the source of repeating defects. Using the chart Measure repeating horizontal lines from the reference lines at the top to determine what may have caused the lines to form in that pattern. Be sure to use portrait orientation for the test file. Rollers Component description Charge roll PC drum PC cleaner Developer roll TAR Toner meter Cart auger First transfer roll Second transfer roll ITU drive/backup rolls ITU reverse roll Fuser hot roll Fuser BUR ITU Second transfer roll ITU ITU Fuser Cartridge Component Planes affected One One One One One One One One All All All All All Defect period mm 38.7 96.8 96.8 47.9 46.4 1092.2 349.9 53.2 59.4 101.0 50.5 147.0 147.0 inches 1.5 3.8 3.8 1.9 1.8 43 13.8 2.09 2.34 3.98 1.99 5.79 5.79 Diagnostic aids 3-3