Brother BN27 Manuals

Manuals and User Guides for Brother BN27. We have 1 Brother BN27 manual available for free PDF download: Service Manual

Brother BN27 Service Manual

Brother BN27 Service Manual (205 pages)

Home Sewing Machine

Brand: Brother | Category: Sewing Machine | Size: 17.06 MB

Table of Contents

Table of Contents

4
- 1 Outline of Mechanism
  10
  - Main Mechanisms
    11
  - Driveline
    12
  - Positions of Electronic Components
    15
  - Control System Block Diagram
    16
2 Basic of Disassembly/Assembly

17
- Main Frame and Covers
  18
- Main Motor Unit
  22
  - Removal of Motor 3P Supply Assy
    23
  - Removal of Lower Shaft Plate
    24
- Feed Unit
  25
- Needle Threading Mechanism
  28
  - Removal of Thread Guard Assy
    29
- Zigzag Mechanism
  30
- Feed Control Mechanism
  33
- Buttonhole and Pattern Selecting Mechanism
  37
- Upper Shaft, Needle Bar and Presser Foot Unit
  41
- Upper Shaft, Needle Bar and Presser Foot Unit
  43
- Buttonhole and Pattern Selecting Mechanism
  47
- Feed Control Mechanism
  52
- Zigzag Mechanism
  56
- Needle Threading Mechanism
  60
  - Attachment of Thread Guard Assy
    61
- Feed Unit
  62
- Main Motor Unit
  66
  - Attachment of Lower Shaft Plate
    67
  - Attachment of Motor 3P Supply Assy
    67
- Main Frame and Covers
  69
- 3 Application of Disassembly/Assembly
  73
  - Main Frame and Covers
    74
  - Disassembly of Face Plate Assy
    75
  - Disassembly of Front Cover Assy
    76
    
    Removal of LED Lamp Supply Assy
    76
    
    Removal of Rubber Cushion a
    76
  - Disassembly of Rear Cover Assy
    77
    
    Removal of Bobbin Presser
    77
    
    Removal of Spool Pin
    77
    
    Removal of Thread Guide Assy
    77
  - Main Motor Unit
    78
    
    Disassembly of Motor 3P Supply Assy
    79
  - Feed Unit
    80
    
    Disassembly of Feed Adjuster Assy
    81
    
    Disassembly of Feed Module
    81
    
    Removal of Slide Plate
    81
    
    Removal/Disassembly of Needle Plate Assy
    81
    
    Removal of NT Lower Thread Cutter
    82
    
    Removal of Inner Rotary Hook Assy
    83
    
    Removal of Needle Plate a
    83
    
    Removal of Stopper Plate R/M
    83
    
    Removal of Base Plate
    84
    
    Removal of Feed Dog
    84
    
    Removal of Feed Stand Supporter
    84
    
    Removal of Inner Rotary Hook Plate Assy
    84
    
    Removal of Feed Supporting Plate
    85
    
    Removal of Set Screw Collar
    85
    
    Removal of Feed Arm Assy
    86
    
    Removal of Feed Stand Sub Assy
    86
    
    Removal of Horizontal Feed Shaft
    86
    
    Removal of V Feed Attachment
    87
    
    Removal of Feed Arm Supporter
    88
    
    Removal/Disassembly of Lower Shaft Assy
    88
    
    Removal of Outer Rotary Hook Assy
    89
  - Needle Threading Mechanism
    91
    
    Disassembly of Needle Threading Unit
    92
    
    Removal of Thread Guard Cover Assy
    92
    
    Removal of Thread Guide Wire
    93
    
    Removal of Thread Take up Spring
    93
    
    Disassembly of Thread Guard Assy
    94
    
    Removal of Thread Guard Supporter Assy
    95
  - Zigzag Mechanism
    96
    
    Disassembly of Z Dial Assy
    97
  - Feed Control Mechanism
    98
    
    Disassembly of Lever Holder Assy
    99
    
    Disassembly of Feed Bracket Sub Assy
    100
  - Buttonhole and Pattern Selecting Mechanism
    101
    
    Disassembly of BH Stopper Assy
    102
    
    Removal of Hexagon M4X40.5
    102
  - Upper Shaft, Needle Bar and Presser Foot Unit
    103
    
    Disassembly of Needle-Presser Module
    104
    
    Disassembly of Upper Shaft Assy
    104
    
    Removal of Presser Foot Holder Assy
    104
    
    Removal of Thread Take-Up Lever Link
    104
    
    Removal of BH Spring
    105
    
    Removal of Needle Bar Crank Rod Assy / Thread Take-Up Lever
    105
    
    Removal of BH Lever Holder Assy
    106
    
    Removal of Thread Guide Plate Assy
    106
    
    Removal of Needle Bar Assy N
    107
    
    Removal of Spring
    107
    
    Removal of Needle Bar Supporter Arm
    108
    
    Removal of Needle Shaft Holder Assy
    108
    
    Removal of Stopper Plate R
    108
    
    Removal of Needle Bar Supporter Assy
    109
    
    Removal of Stopper L
    109
    
    Removal of Presser Foot Lifter
    110
    
    Removal of Presser Bar
    111
    
    Removal of Thread Release Lever
    111
  - Removal of Lock Nut
    111
  - Removal of Shaft Bushing
    112
  - Assembly of Needle-Presser Module
    114
    
    Attachment of Lock Nut
    114
    
    Attachment of Shaft Bushing
    114
    
    Attachment of Presser Bar
    115
    
    Attachment of Presser Foot Lifter
    115
    
    Attachment of Thread Release Lever
    115
    
    Attachment of Needle Bar Supporter Assy
    116
    
    Attachment of Stopper L
    117
    
    Attachment of Needle Bar Supporter Arm
    118
    
    Attachment of Needle Shaft Holder Assy
    118
    
    Attachment of Stopper Plate R
    118
    
    Attachment of Needle Bar Assy N
    119
    
    Attachment of Spring
    119
    
    Attachment of BH Lever Holder Assy
    120
    
    Attachment of Thread Guide Plate Assy
    120
    
    Attachment of BH Spring
    121
    
    Attachment of Needle Bar Crank Rod Assy / Thread Take-Up Lever
    121
    
    Attachment of Presser Foot Holder Assy
    122
    
    Attachment of Thread Take-Up Lever Link
    122
  - Assembly of Upper Shaft Assy
    122
    
    Buttonhole and Pattern Selecting Mechanism
    123
  - Assembly of BH Stopper Assy
    124
    
    Feed Control Mechanism
    125
  - Attachment of Hexagon M4X40.5
    124
  - Assembly of Feed Bracket Sub Assy
    126
  - Assembly of Lever Holder Assy
    127
    
    Zigzag Mechanism
    128
  - Assembly of Z Dial Assy
    129
    
    Needle Threading Mechanism
    130
  - Attachment of Thread Guard Supporter Assy
    131
  - Assembly of Needle Threading Unit
    132
    
    Assembly of Thread Guard Assy
    132
    
    Attachment of Thread Guard Cover Assy
    134
    
    Attachment of Thread Guide Wire
    134
    
    Attachment of Thread Take up Spring
    134
    
    Feed Unit
    136
  - Assembly of Feed Module
    137
    
    Attachment of Outer Rotary Hook Assy
    137
    
    Attachment of Feed Arm Supporter
    138
    
    Assembly/Attachment of Lower Shaft Assy
    139
    
    Attachment of Feed Arm Assy
    140
    
    Attachment of V Feed Attachment
    140
    
    Attachment of Feed Stand Sub Assy
    141
    
    Attachment of Horizontal Feed Shaft
    141
    
    Attachment of Feed Supporting Plate
    142
    
    Attachment of Set Screw Collar
    142
    
    Attachment of Base Plate
    143
    
    Attachment of Feed Dog
    143
    
    Attachment of Feed Stand Supporter
    143
    
    Attachment of Inner Rotary Hook Plate Assy
    143
    
    Assembly/Attachment of Needle Plate Assy
    144
    
    Attachment of Inner Rotary Hook Assy
    144
    
    Attachment of Stopper Plate R/M
    144
    
    Attachment of Needle Plate a
    145
    
    Attachment of NT Lower Thread Cutter
    146
    
    Attachment of Slide Plate
    146
    
    Assembly of Feed Adjuster Assy
    147
    
    Main Motor Unit
    148
    
    Assembly of Motor 3P Supply Assy
    149
    
    Assembly of Rear Cover Assy
    151
    
    Attachment of Bobbin Presser
    151
    
    Attachment of Spool Pin
    151
    
    Attachment of Thread Guide Assy
    151
    
    Assembly of Front Cover Assy
    152
    
    Attachment of LED Lamp Supply Assy
    152
    
    Attachment of Rubber Cushion a
    152
    
    Assembly of Face Plate Assy
    153
4 Adjustment

154
- Removal of Covers
  155
- Needle Point Damage
  157
- Timing Belt Tension
  158
- Adjustment
  159
- Motor Belt Tension
  159
  - Motor Belt Tension
    160
- Needle Bar Supporter Stopper L Position
  161
- Needle Bar Supporter Stopper R Position
  162
- Needle Swing Timing
  163
- Three Point Needle Drop
  166
- Left and Right Needle Clearance
  167
  - Right Needle Drop Position (Zigzag Stitch)
    168
- Right Needle Drop Position (Zigzag Stitch)
  169
- Needle Drop Position to Presser Foot Hole (Front/Back).4
  170
  - Inner Rotary Hook Plate Position
    171
- Needle Bar Rising
  172
- Needle Bar Height
  174
- Needle Clearance
  175
- Left Straight Stitch Needle Drop and Zigzag Stitch Maximum Left Needle Drop Position
  176
- Feed Dog Position (Front/Back and Left/Right)
  178
- Feed Dog Height
  179
  - Presser Bar Height
    180
  - Upper Thread Tension
    181
- SS Pattern (Triple Stretch Stitch) Stitch Length
  182
  - Feed Distance
    183
- Feed Distance
  184
- Straight Forward/Straight Reverse Stitch Length
  185
- BH Lever Switch Load
  187
- Left Reverse Stitch of Buttonhole Stitch Length
  188
  - BH Stitch Bar Tack Feed Distance
    190
- BH Stitch Bar Tack Feed Distance
  191
  - BH Sewing Length
    192
  - Bobbin Winder
    194
- Needle Threader
  195
- Lower Thread Tension
  197
- 5 Failure Investigation for Electronic Parts
  
  198
  - Sewing Lamp Does Not Light
    199
  - Main Motor Does Not Turn or Rotation Speed Is Slow
    200
- 6 Special Instructions of Wiring
  
  201

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