Brother SB7900E - Page 4

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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
2. Disassembly ........................................................................................2 - 1
Main parts ..........................................................................................................2 - 2
Embroidery removal ..........................................................................................................................2 - 3
Top cover removal .............................................................................................................................2 - 3
Face plate removal and disassembly ..................................................................................................2 - 4
Front thread guard cover removal ......................................................................................................2 - 4
Needle plate B removal and disassembly ..........................................................................................2 - 5
Free arm cover removal ....................................................................................................................2 - 5
Front cover removal ..........................................................................................................................2 - 6
Board plate A removal ......................................................................................................................2 - 7
Card cover removal ...........................................................................................................................2 - 7
Main PCB assembly removal ...........................................................................................................2 - 7
Main PCB holder assembly removal .................................................................................................2 - 8
Touch panel assembly removal ..........................................................................................................2 - 8
Indication panel removal ...................................................................................................................2 - 8
Front cover disassembly (bobbin winder guide assembly removal) ..................................................2 - 9
Front cover disassembly (spool pin holder removal) .........................................................................2 - 9
Front cover disassembly (SS-VR PCB assembly removal) .............................................................2 - 10
Front cover disassembly (SV cover removal) ..................................................................................2 - 10
Rear cover removal ..........................................................................................................................2 - 11
Handle removal ................................................................................................................................2 - 11
Electrical parts and motors ..............................................................................2 - 12
Power supply unit F removal ...........................................................................................................2 - 13
PCB Unit LED lamp FL removal ....................................................................................................2 - 13
Base plate sub assy. removal ..........................................................................................................2 - 13
Connector holder assembly removal and disassembly ....................................................................2 - 14
Base plate cover and inlet assembly removal ..................................................................................2 - 14
Base rubber removal ........................................................................................................................2 - 14
Timing belt (motor belt) removal ....................................................................................................2 - 15
Motor fan removal ...........................................................................................................................2 - 15
Main motor assembly removal ........................................................................................................2 - 15
Main motor assembly disassembly ..................................................................................................2 - 16
Coating clip removal ........................................................................................................................2 - 16
Motor PCB assy. removal ................................................................................................................2 - 16
NP PCB assy. removal .....................................................................................................................2 - 17
Belt guard removal ...........................................................................................................................2 - 17
Thread tension mechanism .............................................................................2 - 18
Thread tension assy removal ............................................................................................................2 - 19
Upper thread PCB unit removal .......................................................................................................2 - 19
Upper thread PCB unit disassembly ................................................................................................2 - 19
Thread guide removal ......................................................................................................................2 - 20
Thread guide cover removal ............................................................................................................2 - 20
Tension plate removal ......................................................................................................................2 - 20