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CHAPTER 4 ADJUSTMENTS AND UPDATING OF SETTING,
REQUIRED AFTER PARTS REPLACEMENT.................... 4-1
1. IF YOU REPLACE THE MAIN PCB............................................................................ 4-1
2. IF YOU REPLACE THE ENGINE PCB ..................................................................... 4-11
3. IF YOU REPLACE THE FB UNIT ............................................................................. 4-14
CHAPTER 5 SERVICE FUNCTIONS ....................................................... 5-1
1. MAINTENANCE MODE .............................................................................................. 5-1
1.1 How to Enter the Maintenance Mode .................................................................................5-1
1.2 How to Enter the User-accessible Maintenance Mode ......................................................5-1
1.3 List of Maintenance-mode Functions..................................................................................5-2
1.4 Detailed Description of Maintenance-mode Functions.......................................................5-3
1.4.1 EEPROM Parameter Initialization (Function code 01, 91).......................................5-3
1.4.2 Printout of Scanning Compensation Data (Function code 05).................................5-4
1.4.3 Placement of Scanner Unit Position for Transportation (Function code 06)............5-6
1.4.4 ADF Performance Test (Function code 08) .............................................................5-6
1.4.5 Test Pattern (Function code 09)...............................................................................5-7
1.4.6 Worker Switch (WSW) Setting and Printout.............................................................5-8
1.4.7 Operational Check of LCD (Function code 12) ......................................................5-11
1.4.8 Operational Check of Control Panel Button (Function code 13) ............................5-12
1.4.9 ROM Version Check (Function code 25) ...............................................................5-13
1.4.10 Drum Unit Cleaning (Function code 31)...............................................................5-14
1.4.11 Operational Check of Sensors (Function code 32) ..............................................5-15
1.4.12 Switching of the USB Transfer Speed in the PictBridge Mode/
(Function code 45) ...............................................................................................5-19
1.4.13 EEPROM Customizing (User-accessible) (Function code 52) ............................5-20
1.4.14 Received Data Transfer Function (Function code 53) (MFC-9840CDW only) ....5-21
1.4.15 Fine Adjustment of Scan Start/End Positions (Function code 54) .......................5-23
1.4.16 Acquisition of White Level Data and CCD Scanner Area Setting
(Function code 55) ...............................................................................................5-25
1.4.17 Adjustment of Color Registration (Maintenance Mode 66) ..................................5-26
1.4.18 Paper Feeding and Ejecting Test (Function code 67)..........................................5-28
1.4.19 Sensitivity Adjustment of Density Sensor (Function code 72) (Don’t use)...........5-28
1.4.20 EEPROM Customizing (Function code 74)..........................................................5-29
1.4.21 Sensitivity Adjustment of Registration-mark Sensor (Function code 75).............5-30
1.4.22 Operational Check of Fans (Function code 78) ...................................................5-32
1.4.23 Display of the Machine’s Log Information (Function code 80) .............................5-34
1.4.24 Error Code Indication (Function code 82) ............................................................5-36
1.4.25 Developing Bias Voltage Correction (Function code 83) .....................................5-36
1.4.26 Output of Transmission Log to the Telephone Line (Function code 87)..............5-37
1.4.27 Exit from the Maintenance Mode (Function code 99) ..........................................5-37