Brother HL-4050CDN - Page 8

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9. DISASSEMBLY PROCEDURE (LT-100CL) (HL-4050CDN/ 4070CDW ONLY)......3-130
9.1 LT Paper Tray ................................................................................................................ 3-130
9.2 LT Cover Rear................................................................................................................ 3-134
9.3 LT Cover Left.................................................................................................................. 3-135
9.4 LT Cover Right ............................................................................................................... 3-136
9.5 LT Relay PCB ASSY ...................................................................................................... 3-137
9.6 LT Solenoid ASSY.......................................................................................................... 3-138
9.7 Collar 6 ........................................................................................................................... 3-139
9.8 Cassette Switch ASSY ................................................................................................... 3-139
9.9 LT Paper Feed Frame Unit ............................................................................................ 3-141
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......................................................................4-12
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 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 Test Pattern (Function code 09) .............................................................................. 5-4
1.4.3 Worker Switch (WSW) Setting and Printout ............................................................ 5-5
1.4.4 Operational Check of LCD (Function code 12)........................................................ 5-7
1.4.5 Operational Check of Control Panel PCB (Function code 13) ................................ 5-8
1.4.6 ROM Version Check (Function code 25)................................................................. 5-9
1.4.7 “One Push Demo” Setting (Function code 28) ...................................................... 5-10
1.4.8 Drum Unit Cleaning (Function code 31) ................................................................ 5-10
1.4.9 Operational Check of Sensors (Function code 32)................................................ 5-11
1.4.10 Printout of EEPROM Log (Function code 40)...................................................... 5-14
1.4.11 USB Transfer Speed Change in the PictBridge Mode (Function code 45) ......... 5-15
1.4.12 Paper Feeding and Ejecting Test (Function code 67) ......................................... 5-16
1.4.13 Sensitivity Adjustment of Density Sensor (Function code 72) ............................ 5-16
1.4.14 Sensitivity Adjustment of Registration-mark Sensor (Function code 75) ............ 5-17
1.4.15 Printout of Maintenance Information (Function code 77)..................................... 5-19
1.4.16 Operational Check of Fans (Function code 78)................................................... 5-20
1.4.17 Display of the Machine’s Log (Function code 80)................................................ 5-22