Brother HL-4140CN Service Manual page 7

3. IF YOU REPLACE THE HIGH-VOLTAGE POWER SUPPLY PCB ASSY4-7
3.1 Sensitivity Adjustment of Density Sensor (Maintenance Mode: Code 72).................. 4-7
3.2 Performing the Developing Bias Voltage Correction (Maintenance Mode: Code 83) . 4-7
3.3 Performing the Adjustment of Inter-color Position Alignment
(Maintenance Mode: Code 66) ................................................................................... 4-7
4. IF YOU REPLACE THE LASER UNIT .......................................................4-8
4.1 Sensitivity Adjustment of Density Sensor (Maintenance Mode: Code 72).................. 4-8
4.2 Performing the Developing Bias Voltage Correction (Maintenance Mode: Code 83) . 4-8
4.3 Performing the Adjustment of Inter-color Position Alignment
(Maintenance Mode: Code 66) ................................................................................... 4-8
5. IF YOU REPLACE THE LOW-VOLTAGE POWER SUPPLY PCB ASSY .4-9
5.1 Reset of Irregular Power Supply Detection Counter................................................... 4-9
6. IF YOU REPLACE THE DRUM DRIVE MOTOR .....................................4-10
CHAPTER 5 SERVICE FUNCTIONS
1. MAINTENANCE MODE..............................................................................5-1
1.1 How to Enter the Maintenance Mode ......................................................................... 5-1
1.2 How to Enter the End 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 Monochrome image quality test pattern (Function code 09).............................. 5-4
1.4.3 Worker switch (WSW) setting and printout (Function code 10, 11) ................... 5-5
1.4.4 Operational check of LCD (Function code 12) .................................................. 5-8
1.4.5 Operational check of control panel button (Function code 13) .......................... 5-9
1.4.6 Software version check (Function code 25)..................................................... 5-10
1.4.7 "One Push Demo" setting (Function code 28) ................................................. 5-11
1.4.8 Operational check of sensors (Function code 32) ........................................... 5-12
1.4.9 LAN connection status display (Function code 33).......................................... 5-15
1.4.10 Printout of EEPROM log (Function code 40)................................................. 5-16
1.4.11 Not-disclosed-to-users functions (Function code 45)..................................... 5-17
1.4.12 Adjustment of inter-color position alignment (Function code 66)................... 5-21
1.4.13 Continuous print test (Function code 67)....................................................... 5-25
1.4.14 Laser unit test pattern print (Function code 68) ............................................. 5-28
1.4.15 Frame pattern print (One-sided) (Function code 69) ..................................... 5-29
1.4.16 Frame pattern print (Two-sided) (Function code 70) ..................................... 5-31
1.4.17 Color test pattern (Function code 71) ............................................................ 5-33
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