Brother HL-3450CN Service Manual page 5

CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS.............. 4-3
1. BASIC STRUCTURE ......................................................................................4-3
1.1 Mechanical Structure ...........................................................................................................4-3
1.2 Basic Mechanism of Color Printing ......................................................................................4-5
1.3 Structure of the OPC Belt ....................................................................................................4-7
1.4 Print System and Transfer System ......................................................................................4-8
1.5 Scanning System ...............................................................................................................4-23
1.6 Paper Transportation System ............................................................................................4-25
1.7 Fusing Unit .........................................................................................................................4-26
2. STRUCTURE OF THE CONTROL SYSTEM.................................................4-28
2.1 Basic Structure - Electrical System and Functions ............................................................4-28
2.2 Control System - Control of the Print Process ...................................................................4-37
2.3 Main PCB (Video Controller PCB) .....................................................................................4-46
2.4 Low-voltage Power Supply Unit .........................................................................................4-60
2.5 High-voltage Power Supply Unit ........................................................................................4-63
2.6 Connection Diagram ..........................................................................................................4-65
CHAPTER 5 CONTROL PANEL OPERATION ............................... 5-3
1. PANEL LAYOUT.............................................................................................5-3
2. VIDEO CONTROLLER MODE........................................................................5-4
2.1 Configuration of Operational Mode ......................................................................................5-4
2.2 Line Test Mode ....................................................................................................................5-5
2.3 DRAM Test Mode ................................................................................................................5-9
2.4 Test Print Mode..................................................................................................................5-10
2.5 NVRAM Reset Mode..........................................................................................................5-10
3. ENGINE CONTROLLER MODE ...................................................................5-11
3.1 Configuration of Operational Mode ....................................................................................5-11
3.2 Operation of Normal Mode.................................................................................................5-13
3.3 Service Mode .....................................................................................................................5-20
3.4 Adjustment Work Procedures ............................................................................................5-44
CHAPTER 6 PERIODIC MAINTENANCE ....................................... 6-3
1. GENERAL.......................................................................................................6-3
1.1 Handling Precautions ...........................................................................................................6-3
1.2 List of Maintenance Tools
1.3 List of Consumables for Maintenance..................................................................................6-5
2. PERIODIC MAINTENANCE CLEANING .........................................................6-6
2.1 Cleaning the Register Roller ................................................................................................6-9
2.2 Cleaning the Paper Guide..................................................................................................6-10
2.3 Cleaning the Paper Exit Roller ...........................................................................................6-11
2.4 Cleaning the Transfer Roller ..............................................................................................6-12
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HL-34500CN SERVICE MANUAL
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