Process Section - Cyan, Magenta & Yellow: 
(or when the colour maintenance counter has reached the specified life). 
Replace Cyan, Magenta & Yellow Drum Units  (MX-51GUSA x 3) or  
  OPC Drum  (MX-51GRSA x 3) &  
  Main Charge Unit (MX-510MK x 3) 
Replace C, M, Y Developer  (MX-51GVSA). 
Sim 24-04   Clear C, M, Y (Colour) Drum CTRG Counters. 
    Clear C, M, Y (Colour) Main Charger Counters. 
    Clear C, M, Y (Colour) Drum Blade Counters. 
    Clear Maintenance [Colour] Counter. 
Sim 25-02   Toner Concentration Auto Adjustment - Select C, M, Y. 
  If ALL developer is replaced at the same time, select CMYK. 
  When Sim 25-02 is executed, the Developer Counter (Sim 24-05) is 
also cleared automatically. 
Caution: Ensure ALL toner cartridges are removed, prior to executing Sim 25-02. 
Sim 44-27   Clear Half Tone Process Correction. 
Process Section -Black: 
(or when the Black maintenance counter has reached the specified life). 
Replace Black Developer  (MX-51GVBA). 
Replace Black Drum Unit  (MX-51GUSA) or   
  OPC Drum  (MX-51GRSA). 
  Main Charge Unit  (MX-510MK). 
Sim 24-05   Clear K (Black) Developer Counter. 
Sim 24-04   Clear K (Black) Drum CTRG Counter. 
    Clear K (Black) Main Charger Counter. 
    Clear K (Black) Drum Blade Counter. 
    Clear Maintenance [ALL] Counter. 
Sim 25-02   Toner Concentration Auto Adjustment - Select K. 
  If ALL developer is replaced at the same time, select CMYK. 
  When Sim 25-02 is executed, the Developer Counter (Sim 24-05) is 
also cleared automatically. 
Caution: Ensure ALL toner cartridges are removed, prior to executing Sim 25-02. 
Image Quality Adjustments (for CMYK): 
Sim 44-02  Image Density & Registration Sensor Adjustment. 
Sim 50-22  Drum Position & Registration Adjustment - select ALL. 
Sim 44-06  Process Control execution. 
Sim 46-74   Automatic Colour Balance Adjustment (Copy & Printer). 
Sim 46-01   Adjust Copy Exposure Density (Colour). 
Sim 46-02  Adjust Copy Exposure Density (B/W).