Lexmark C750 Service Manual - Page 37

5060-00x Symptom tables Symptom table-base printer Symptom Fuser fan fails to run or is noisy RIP fan fails to run or is noisy VTB fan fails to run or is noisy Machine inoperative: Fans don't turn, engine not on, lights not on, none of the printer functions work. Operator panel: One or more buttons do not work Operator panel: Display is blank, printer does not sound 5 beeps, but printer is not inoperative. Operator panel: Operator panel displays all diamonds continuously, sounds 5 beeps and POST inoperative Operator panel: One pel or random pels are missing Paper feed problems, base printer Paper feed problems, integrated tray Paper feed problems, MPF Printer prints black only, no colors Action Go to "925 Error code" on page 2-90. Go to "927 Error code" on page 2-91. Go to "926 Error code" on page 2-90. Go to "AC and DC power service check" on page 2-112. Go to "Operator panel LCD/status LED/buttons service check" on page 2-132. Replace the operator panel. Go to "Operator panel removal" on page 4-46. Go to "Operator panel LCD/status LED/buttons service check" on page 2-132. Replace the operator panel. Go to "Operator panel removal" on page 4-46. Go to "200 Paper jam-Tray 1" on page 2-67. Go to "Tray 1 service check" on page 2-149. Go to "Multipurpose feeder (MPF)" on page 2-70. Make sure that the printer is not set up to print black only. If the printer is set up correctly, check the black retract motor and gears for correct operation. If the gears are operating correctly, go to "Black only retract (BOR) service check" on page 2-117. Go to "Entire page is mostly one color-Full bleed planes in one color" on page 2-140. Print quality: 100% single color printed All black print All cyan print All magenta print All yellow print Print quality: blank page (no image) Print quality: evenly spaced horizontal marks or lines on the printed page Print quality: black line Go to "Blank page (no image)" on page 2-139. Go to "Horizontal lines or streaks" on page 2-137. Black horizontal lines are most likely caused by a shorted charge roll in the print cartridge. Replace the black print cartridge. Go to "Vertical lines or streaks" on page 2-138 or "Horizontal lines or streaks" on page 2-137. Go to "Vertical lines or streaks" on page 2-138 or "Horizontal lines or streaks" on page 2-137. Go to "All colors have light print over the entire page" on page 2-142. or "One color has light print over the entire page" on page 2-143 Go to "Light print over the entire page" on page 2-142. Go to "Missing colors-Complete or partially missing color planes" on page 2-141. Go to "Uneven printing" on page 2-145. Go to "Poor color alignment" on page 2-144. Print quality: magenta, cyan, or yellow lines Print quality: colored lines, streaks, or smudges Print quality: light lines or streaks appear on the printed page Print quality: light print Print quality: missing colors Print quality: uneven printing Print quality: poor color alignment Diagnostic information 2-3