Brother NV4000D Service Manual page 3

1. Outline of Mechanism ........................................................................1 - 1
Main Mechanisms ...........................................................................1 - 2
Driveline ..........................................................................................1 - 3
Positions of electronic components ................................................1 - 4
Control system block diagram .........................................................1 - 5
Operation of other electronic components ......................................1 - 6
Using the threader ..........................................................................1 - 8
2. Disassembly ........................................................................................2 - 1
Main parts ..........................................................................................................2 - 2
Accessory table removal ....................................................................................................................2 - 3
Top cover removal .............................................................................................................................2 - 3
Needle plate B assembly removal ......................................................................................................2 - 3
Needle plate B ASSY disassembly ....................................................................................................2 - 4
Face plate assembly removal .............................................................................................................2 - 4
NT lower cutter thread removal .........................................................................................................2 - 5
Front thread guide cover removal ......................................................................................................2 - 5
Thread guide cover A removal ..........................................................................................................2 - 5
Lower thread cutter removal ..............................................................................................................2 - 5
Free arm cover removal .....................................................................................................................2 - 6
Base plate cover removal ...................................................................................................................2 - 6
Bobbin winder removal .....................................................................................................................2 - 6
Front cover removal ...........................................................................................................................2 - 7
Front cover disassembly (panel PCB connector removal) .................................................................2 - 8
Front cover disassembly (LED lamp R removal) ..............................................................................2 - 8
Front cover disassembly (LED lamp 3 removal) ...............................................................................2 - 8
Front cover disassembly (VR PCB assembly removal) .....................................................................2 - 8
Front cover disassembly (thread PCB assembly removal) ................................................................2 - 9
Front cover disassembly (SS PCB assembly removal) ......................................................................2 - 9
Front cover disassembly (button removal) ........................................................................................2 - 9
Front cover disassembly (plate D removal) .......................................................................................2 - 9
Front cover disassembly (inverter D6 assembly removal) ..............................................................2 - 10
Front cover disassembly (board case assembly removal) ................................................................2 - 11
Front cover disassembly (card PCB cover assembly removal) .......................................................2 - 12
Front cover disassembly (connector cover removal) .......................................................................2 - 12
Front cover disassembly (foot controller jack assembly removal) ..................................................2 - 12
Front cover disassembly (LCD holder assembly removal) .............................................................2 - 13
Front cover disassembly (SV keytop removal) ................................................................................2 - 13
Front cover disassembly (LCD assembly removal) .........................................................................2 - 14
Rear cover removal ..........................................................................................................................2 - 15
Rear cover disassembly (plate B removal) ......................................................................................2 - 15
Rear cover disassembly (plate A removal) ......................................................................................2 - 16
Drop cover removal .........................................................................................................................2 - 16
Handle assembly removal ................................................................................................................2 - 16
Handle ASSY disassembly ..............................................................................................................2 - 17
Power unit, motor unit ......................................................................................2 - 18
Power PCB assembly removal .........................................................................................................2 - 19
Power PCB ASSY disassembly .......................................................................................................2 - 19
Base plate assembly removal ...........................................................................................................2 - 20
Inlet assembly removal ....................................................................................................................2 - 20
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