Lexmark X500n Service Manual - Page 43

Error code H4 Service Call Fuser Unit HA Service Call Fuser Unit L1 Service Call Laser Unit Assembly L2 Service Call Laser Unit Assembly LL Service Call Laser Unit Assembly N3 Service Call HVPS Connection N4 Service Call Toner Empty Sensor N5 Service Call Toner Empty Rcv N6 Service Call LFU Connection P6 Service Call Pfeed Clutch Tray 2 7100-XXX Action Fusing temperature rises above limit during printing process and does not return within the alloted time period. See "Fuser assembly service check" on page 2-24. AC relay turned off due to an abnormal temperature. See "Fuser assembly service check" on page 2-24. Laser scanning beam is not detected by beam sensor. See "Laser unit assembly service check" on page 2-25. Scanner motor (SM) is rotating abnormally. See "Laser unit assembly service check" on page 2-25. Laser power is lower than the output limit. See "Laser unit assembly service check" on page 2-25. Improper connection between engine controller board and HVPS. See "HVPS connection service check" on page 2-25. Improper connection between engine controller board and toner sensor sender board. See "Toner empty sensor (sender-TPD) service check" on page 2-26. Improper connection between engine controller board and toner sensor receiver board. See "Toner empty sensor (receiver-TTR) service check" on page 2-27. Improper connection between engine controller board and lower paper feed unit. See "Lower feed unit (secondary paper assembly) service check" on page 2-28. Data communication error between engine controller board and LFU paper-feed clutch. See "Lower feed unit (secondary paper assembly) service check" on page 2-28. Diagnostic information 2-5