Lexmark C750 Service Manual - Page 182

5060-00x Second transfer roll service check Note: The second transfer roll is 51.03 mm (2.009 inches) in circumference. Any print quality problems such as lines that are spaced apart indicate you should check the second transfer roll for damage, toner, or foreign material. Note: The second transfer roll is also part of the maintenance kit and should be replaced when a "83 ITU Maintenance" message appears. Ask the customer if they have replaced the second transfer roll recently. Note: If any of the following problems occur, go to "Print quality service checks" on page 2-136: • A problem with only one color • Light or very light print CAUTION: Make sure the printer is powered off before making any checks on the second transfer roll or associated parts for personal safety and to prevent damage to the printer. Step 1 Actions and questions Second transfer roll assembly-check the second transfer roll for any signs of toner buildup, surface damage to the roll, oil, or other contaminants on the surface of the roll. Do you see any problems with the second transfer roll? 2 Transfer arms, springs, and associated hardware-call your next level of support. None of these parts are service related parts. Is there any problem with the associated hardware? 3 Transfer high voltage power supply, HV wiring and contacts-check the second transfer cable (transfer HVPS contact I to the second transfer roll rear arm contact) for correct installation. Is the cable installed correctly? 4 Check the continuity of the second transfer cable. Is there continuity? Replace the FRUs in order: 1. Second transfer roll. See "Second transfer roll removal" on page 4-79 2. Transfer HVPS board. See "Transfer HVPS board removal" on page 4-80. If this does not correct the problem, go to step 5. 5 Make sure the ITU Bias Spring is not broken or missing for the color(s) that is having Transfer problems. Is the ITU Bias Spring broken, off, or missing? 6 Check the transfer HVPS to ITU HV transfer terminal for the color(s) that is having transfer problems. Is the cable disconnected or broken? Reinstall or replace the cable Go to step 7 Repair as necessary Replace the second transfer cable Go to step 4 Install the cable correctly Yes Replace the second transfer roll. See "Second transfer roll removal" on page 4-79 Call your next level support No Go to step 2 Go to step 3 Go to step 6 2-148 Service Manual