Brother HL-2700CN Service Manual page 5

2. STRUCTURE OF THE CONTROL SYSTEM.............................................. IV-26
2.1 Basic Structure .................................................................................................................IV-26
2.2 Control System.................................................................................................................IV-34
2.3 Main PCB (Video Controller PCB) ...................................................................................IV-42
2.4 Power Supply Unit............................................................................................................IV-56
2.5 High Voltage Power Supply Unit ......................................................................................IV-61
2.6 Wiring Diagram.................................................................................................................IV-64
CHAPTER V CONTROL PANEL OPERATION .............................. V-1
1. PANEL LAYOUT ............................................................................................ V-1
2. VIDEO CONTROLLER MODE....................................................................... V-2
2.1 Configuration of Operational Mode .....................................................................................V-2
2.2 Line Test Mode....................................................................................................................V-3
2.3 DRAM Test Mode................................................................................................................V-8
2.5 NVRAM Reset Mode...........................................................................................................V-9
3. ENGINE CONTROLLER MODE .................................................................. V-10
3.1 Configuration of Operational Mode ...................................................................................V-10
3.2 Operation of Normal Mode................................................................................................V-12
3.3 Service Mode ....................................................................................................................V-19
3.4 Adjustment Work Procedures ...........................................................................................V-42
CHAPTER VI PERIODIC MAINTENANCE...................................... VI-1
1. GENERAL..................................................................................................... VI-1
1.1 Precautions in Handing ......................................................................................................VI-1
1.2 Cleaning for Periodic Maintenance ....................................................................................VI-4
1.3 Periodic Maintenance Parts and Maintenance Cycle ......................................................VI-10
2. PERIODIC MAINTENANCE PROCEDURES.............................................. VI-12
2.1 Replacement of OPC Belt Cartridge ................................................................................VI-12
2.2 Replacement of Fusing Unit.............................................................................................VI-14
2.3 Replacement of Transfer Roller Assy PU ........................................................................VI-16
2.4 Replacement of Cleaning Roller Cover PU......................................................................VI-18
2.5 Replacement of Paper Feed Roller and Separator Pad ..................................................VI-20
2.6 Replacement of Transfer Unit PU ....................................................................................VI-24