Brother PR655 User manual

i
1. Outline of Mechanism ........................................................................1 - 1
Main mechanisms ..............................................................................................1 - 2
Driveline .............................................................................................................1 - 3
Positions of electronic components ...................................................................1 - 5
Control system block diagram ...........................................................................1 - 7
Layout for P.C.B. connectors .............................................................................1 - 8
Operation of other electronic components .......................................................1 - 10
2. Disassembly ........................................................................................2 - 1
Main parts ..........................................................................................................2 - 2
Motor cover and carriage cover removal ...........................................................................................2 - 3
Bed cover removal .............................................................................................................................2 - 4
Arm cover R removal ........................................................................................................................2 - 5
Arm cover L removal .........................................................................................................................2 - 6
Base cover R removal ........................................................................................................................2 - 7
Base cover L removal ........................................................................................................................2 - 8
LED PCB plate removal ....................................................................................................................2 - 8
Main PCB assembly removal ............................................................................................................2 - 9
Board holder U/D removal ..............................................................................................................2 - 10
Spool stand frame final assembly removal ......................................................................................2 - 10
Operation panel assembly removal ..................................................................................................2 - 11
Thread take-up lever cover removal ................................................................................................2 - 11
Tension base removal ......................................................................................................................2 - 12
Needle plate removal .......................................................................................................................2 - 12
Needle plate base assembly removal ...............................................................................................2 - 13
Needle plate base disassembly .........................................................................................................2 - 13
Picker bracket removal ....................................................................................................................2 - 13
Picker bracket disassembly ..............................................................................................................2 - 14
Rotary hook removal .......................................................................................................................2 - 14
Cutter unit final assembly and picker final assembly removal ........................................................2 - 15
Feed unit ..........................................................................................................2 - 16
T-belt (Y-guide) removal .................................................................................................................2 - 17
Feed final assembly removal ...........................................................................................................2 - 18
Y area PCB assembly removal ........................................................................................................2 - 19
Extension IF PCB assembly removal ..............................................................................................2 - 19
Y motor assembly removal ..............................................................................................................2 - 20
Y-motor disassembly .......................................................................................................................2 - 20
Y-driving shaft assembly removal ...................................................................................................2 - 21
Cord grip removal ............................................................................................................................2 - 21
FFC and X-area sensor assembly removal ......................................................................................2 - 22
Y-frame spacer and X-belt presser removal ....................................................................................2 - 22
X-feed frame B removal ..................................................................................................................2 - 22
X-carriage A assembly and X-carriage B assembly removal ..........................................................2 - 23
X-sensor dog removal ......................................................................................................................2 - 23
Hoop sensor removal .......................................................................................................................2 - 24
X-guide shaft removal .....................................................................................................................2 - 24
T-belt (Y-drive) removal .................................................................................................................2 - 25
Feed frame disassembly ...................................................................................................................2 - 25
Y-carriage L disassembly ................................................................................................................2 - 26
Y-carriage R disassembly ................................................................................................................2 - 27
Connect PCB disassembly ...............................................................................................................2 - 27

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Needle thread unit ...........................................................................................2 - 28
Needle thread assembly removal .....................................................................................................2 - 29
LED pointer removal .......................................................................................................................2 - 29
Hook holder assembly removal .......................................................................................................2 - 30
Rack and hook holder link removal .................................................................................................2 - 30
TH motor assembly removal ............................................................................................................2 - 31
Needle bar change unit ....................................................................................2 - 32
Change box center cover removal ...................................................................................................2 - 33
Change box removal ........................................................................................................................2 - 33
Change box disassembly (Step 1) ....................................................................................................2 - 34
Change box disassembly (Step 2) ....................................................................................................2 - 35
Thread wiper unit .............................................................................................2 - 36
LED unit left assy removal ..............................................................................................................2 - 37
LED unit right assy removal ............................................................................................................2 - 37
Thread presser base removal ............................................................................................................2 - 37
Thread presser base disassembly .....................................................................................................2 - 37
Wiper set assembly removal ............................................................................................................2 - 38
Wiper guide and wiper sensor removal ...........................................................................................2 - 38
Wiper set disassembly .....................................................................................................................2 - 39
Needle bar unit ................................................................................................2 - 40
LED unit left assy disassembly ........................................................................................................2 - 41
LED unit right assy disassembly .....................................................................................................2 - 41
LED cord guide removal ..................................................................................................................2 - 42
Needle bar case final assembly removal ..........................................................................................2 - 42
Change roller base assembly removal .............................................................................................2 - 42
Case guide D removal ......................................................................................................................2 - 42
Thread take-up lever assembly removal ..........................................................................................2 - 43
Thread take-up lever disassembly ....................................................................................................2 - 43
Needle bar removal ..........................................................................................................................2 - 44
Needle bar case disassembly ............................................................................................................2 - 44
Case positioning plate assembly removal ........................................................................................2 - 45
Case positioning plate disassembly .................................................................................................2 - 45
Case bracket assembly removal .......................................................................................................2 - 46
Case bracket disassembly ................................................................................................................2 - 47
Case guide UL disassembly .............................................................................................................2 - 47
Upper shaft unit ...............................................................................................2 - 48
Main motor final assembly removal ................................................................................................2 - 49
Main motor disassembly ..................................................................................................................2 - 50
Driving jump assembly removal ......................................................................................................2 - 50
Driving jump disassembly ...............................................................................................................2 - 51
Base needle bar removal ..................................................................................................................2 - 52
J-clamp disassembly ........................................................................................................................2 - 52
Presser foot vertical base disassembly .............................................................................................2 - 53
Thread take-up driving lever final assembly removal .....................................................................2 - 53
Thread take-up driving lever disassembly .......................................................................................2 - 54
Main shaft sensor final assembly removal .......................................................................................2 - 55
Crank rod removal ...........................................................................................................................2 - 55
Pressure foot driving shaft assembly removal .................................................................................2 - 56
Presser foot driving shaft disassembly .............................................................................................2 - 56
Upper shaft assembly removal .........................................................................................................2 - 57
Upper shaft disassembly ..................................................................................................................2 - 57
Lower shaft unit ...............................................................................................2 - 58
Arm bed and base frame disconnection ...........................................................................................2 - 59