Brother HL-1850 Service Manual page 7

3.10 Process Unit Cover ASSY.............................................................................................. 4-25
3.11 Laser Unit....................................................................................................................... 4-26
3.12 Fixing Unit ...................................................................................................................... 4-27
3.13 Paper Pick-up Roller ASSY............................................................................................ 4-39
3.14 Feed MP Unit ................................................................................................................. 4-40
3.15 Drive Unit ....................................................................................................................... 4-42
3.16 Low-voltage Power Supply PCB ASSY.......................................................................... 4-47
3.17 Main PCB ASSY............................................................................................................. 4-48
3.18 Fan Motor / Fan Motor 60 .............................................................................................. 4-48
3.19 Base Plate ...................................................................................................................... 4-49
3.20 Engine PCB ASSY / High-voltage Power Supply PCB ASSY........................................ 4-49
3.21 DX Sensor PCB ASSY ................................................................................................... 4-51
3.22 Toner Sensor PCB Unit (Light Reception) ..................................................................... 4-52
3.23 Toner LED PCB Unit (Light Emission) ........................................................................... 4-52
3.24 Paper Feed Roller ASSY................................................................................................ 4-53
3.25 First Feed Roller ASSY .................................................................................................. 4-53
3.26 Exit Roller Unit................................................................................................................ 4-55
3.27 Harness Winding Form .................................................................................................. 4-57
4. PACKING ..............................................................................................................4-58
CHAPTER 5 PERIODIC MAINTENANCE............................................... 5-1
1. CONSUMABLE PARTS...........................................................................................5-1
1.1 Drum Unit ......................................................................................................................... 5-1
1.2 Toner Cartridge ................................................................................................................ 5-2
2. PERIODICAL REPLACEMENT PARTS...................................................................5-5
3. PERIODICAL CLEANING........................................................................................5-6
3.1 Cleaning the Printer Exterior ............................................................................................ 5-6
3.2 Cleaning the Drum Unit .................................................................................................... 5-6
3.3 Cleaning the Scanner Window ......................................................................................... 5-7
3.4 Cleaning the Electrical Terminals..................................................................................... 5-8
4. MTBF / MTTR..........................................................................................................5-9
CHAPTER 6 TROUBLESHOOTING ....................................................... 6-1
1. INTRODUCTION .....................................................................................................6-1
1.1 Initial Check...................................................................................................................... 6-1
1.2 Warnings for Maintenance Work...................................................................................... 6-2
1.3 Identify the Problem ......................................................................................................... 6-3
2. OPERATOR CALLS & SERVICE CALLS ................................................................6-4
2.1 Operator Calls .................................................................................................................. 6-4
2.2 Service Calls .................................................................................................................... 6-6
3. PAPER PROBLEMS................................................................................................6-9
3.1 Paper Loading Problems.................................................................................................. 6-9
3.2 Paper Jams .................................................................................................................... 6-10
3.2.1 Clearing jammed paper..................................................................................................... 6-11
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HL-1850/1870N SERVICE MANUAL