Lexmark T620 Service Manual - Page 143

4069-5XX/7XX FRU 1 Printhead 2 Transfer Roll Assembly 3 High Voltage Contacts Action The printhead on the Lexmark T printers cannot be cleaned. Try another printhead if all other attempts fail to correct a background problem. Check the high voltage contact from the HVPS to the transfer roll. Check the transfer arm assembly right side bearing for any signs of contamination, pitting or a loose cable to the bearing. If any problems are found, replace the defective part. Check the transfer roll shaft for any signs of contamination, wear or pitting on the ends of the shaft that go into the bearings. If a problem is found, clean the ends of the shaft or replace the transfer roll assembly. Check the high voltage contacts on the right side frame to ensure they are clean and not bent, deformed, or pitted. If incorrect, replace the contact. Diagnostic Information 2-115