Brother PE770 User manual

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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

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Thread release holder assy. F removal .............................................................................................2 - 21
PF-F SW assy. removal ...................................................................................................................2 - 21
Thread guide shutter removal ..........................................................................................................2 - 21
Tension releaser link removal ..........................................................................................................2 - 22
Plate assembly removal ...................................................................................................................2 - 22
Thread guide removal ......................................................................................................................2 - 22
Thread tension gear removal ............................................................................................................2 - 22
AT pulse motor removal ..................................................................................................................2 - 23
Tension disk removal .......................................................................................................................2 - 23
Thread take up spring removal ........................................................................................................2 - 23
Thread guide wire removal ..............................................................................................................2 - 24
Bobbin winder mechanism ...............................................................................2 - 25
Bobbin winder cover removal ..........................................................................................................2 - 26
Bobbin base disassembly .................................................................................................................2 - 26
Bobbin presser removal ...................................................................................................................2 - 26
Bobbin winder assembly removal ....................................................................................................2 - 26
BW holder supporter removal ..........................................................................................................2 - 27
BW-F SW assy. removal .................................................................................................................2 - 27
BW shaft holder assembly removal .................................................................................................2 - 27
Bobbin winder shaft stopper removal ..............................................................................................2 - 27
Rotary hook drive mechanism / Feed and bobbin mechanism / Cutter assy. mechanism ...2 - 28
Coating clip removal .......................................................................................................................2 - 29
Thread cutter module removal .........................................................................................................2 - 29
Feed module removal ......................................................................................................................2 - 29
Lower shaft A assy. removal ...........................................................................................................2 - 30
Joint removal ....................................................................................................................................2 - 30
Timing pulley D removal .................................................................................................................2 - 30
Lower shaft bushing removal ..........................................................................................................2 - 30
Needle bar, presser mechanism / Upper shaft mechanism .............................2 - 31
Upper shaft removal .........................................................................................................................2 - 32
Pulley removal .................................................................................................................................2 - 32
Upper shaft pulley removal ..............................................................................................................2 - 32
Tension pulley assembly removal ....................................................................................................2 - 32
Needle-presser module removal ......................................................................................................2 - 33
Plate spring removal ........................................................................................................................2 - 34
Needle-presser module ...................................................................................2 - 35
Quilting foot removal .......................................................................................................................2 - 36
Adjusting plate assy. removal ..........................................................................................................2 - 36
Adjusting plate ASSY disassembly .................................................................................................2 - 36
Guard plate removal .........................................................................................................................2 - 36
Spring removal .................................................................................................................................2 - 37
Lock nut removal .............................................................................................................................2 - 37
Needle bar assy. removal .................................................................................................................2 - 37
Needle bar assy. disassembly ...........................................................................................................2 - 37
Needle holder guide assy. removal ..................................................................................................2 - 38
Lever A spring removal ...................................................................................................................2 - 38
Needle bar supporter assy. removal .................................................................................................2 - 38
Lever AB assy. removal ...................................................................................................................2 - 39
Lever AB assy. disassembly ............................................................................................................2 - 39
Shaft bushing A removal .................................................................................................................2 - 39
Thread guide plate removal .............................................................................................................2 - 40
Hook release plate removal ..............................................................................................................2 - 40
Threader hook assy. disassembly .....................................................................................................2 - 40