Lexmark C920 Service Manual - Page 97

5056-XXX Marks on paper service check If you have evenly spaced marks on the paper, measure the distance between the marks, and locate the symptom in the following table. Check the assembly for dirt or damage and clean as necessary. Run a test print to verify the problem has been corrected. The indicated assemblies are replaced by the customer at prescribed intervals. If you remove the transfer belt, do not turn it upside down. Toner will fall from the waste toner box onto the transfer sheets and roller(s) inside the belt. This causes lower transfer efficiency and washed out colors. Distance between marks 27 mm 31.5 mm 45.1 mm 46.9 mm 46.9 mm 47.5 mm 64.5 mm 94.2 mm 139.2 mm 140 mm 824.5 mm FRU / supply item Absorption/charge roller (transfer roller) Photodeveloper charge roller Supply roller (toner cartridge) Upper registration roller Lower registration roller Developer roller (toner cartridge) OCR (oil coating roller) Photodeveloper drum Fuser upper roller Fuser lower roller Transfer belt Fuser part locations Thermistor hot roll Thermistor BUR TCO hot roll TCO BUR Detact fingers hot roll Detact fingers BUR Exit rollers Star rollers Operator panel service check From paper center (mm) -6 0 66 101 113.5/75/37.5/0/-37.5/-75/-113.5 134/90/45/0/-45/-90/-134 96/37.5/-37.5/-96 127/60/15/-15/-60/-127 FRU 1 • Operator panel • Operator panel cable • RIP board. Ensure code is at the latest level. Action Run both the LCD Hardware Test and the Button Test in Diagnostic Mode. Be sure the operator panel cable connections are securely connected on the RIP board and operator panel. Diagnostic information 2-55