Lexmark 4049LMO Service Manual - Page 42

4049-XXX Run the Print Test with the RIP Board removed. Make the following voltage checks: Connector J13-1 to J13-4 J13-2 to J13-4 J13-3 to J13-4 J13-8 to J13-4 Voltage while Printing Less than 5 VDC Less than 5 VDC (Fluctuates between pages) +1.5 VDC Less than 1 VDC Voltage while Idling 0 VDC 0 VDC 0 VDC +6 VDC If the voltages are not correct replace the engine board. Blurred or Fuzzy Print This can be caused by a damaged gear train or by paper slippage in the feed roll or transfer roll. Also see Banding. Inspect the HVPS contacts; make sure each spring-loaded contact returns when pressed and released. Inspect the transfer roll housing contacts for damage or contamination. Check the gear train for damage, binds, or wear. When using the 100-sheet auxiliary feeder, some blurring may occur at the point where the feeder's friction rollers release the paper. Dead Machine Possible causes: no voltage reaching the printer, LVPS failure, blown LVPS fuse, failure of the On/Off switch or switch linkage, or a shorted electrical component. Check for the indicated voltages at the LVPS connection to the engine board. If no voltages are present, remove the LVPS cover and check fuse F1 and the power switch before replacing the LVPS. If some voltages are present but all are not correct, disconnect all cables except the LVPS from the engine board. POR and verify that 2-15