Service Call Conditions 
M018/M019 3-16 SM Appendix 
 
Zero Cross Frequency Error 
The detection error occurs ten times consecutively in ten zero cross signal 
detections. This error is defined when the detected zero cross signal is 17 or 
less/27 or more for 0.2 seconds. 
557 
  Defective fusing lamp relay 
  Unstable input power source 
1.  Check the power supply source. 
2.  Replace the fusing unit. 
 
  Execute "Engine Maintenance Menu" to recover the machine after 
completing the recovery procedure. Otherwise, the machine continues to 
issue this SC code and cannot be operated. 
 
Consecutive Fusing Jam 
The paper jam counter for the fusing unit reaches 3. The paper jam counter is 
cleared if the paper is fed correctly. 
This SC is activated only when this function is enabled with "Engine Maintenance" 
(default "OFF"). 
559 
  Defective fusing unit 
  Defective fusing control 
1.  Clear this SC to send a command after a jam removal. 
2.  Turn off this function after a jam removal. 
 
  Execute "Engine Maintenance Menu" to recover the machine after 
completing the recovery procedure. Otherwise, the machine continues to 
issue this SC code and cannot be operated. 
 
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