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Sewing Machine
BC800
Brother BC800 User Manual
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4 - 16
Adjustment
Bobbin winder (uneven bo
bbin winding an
d bob
bin winding amounts) adjustment
1.
Move the bobbin winder tension assy. up and dow
n to adjust uneven bobbin winding.
2.
Turn the bobbin p
resser left and right, an
d adjust the wind
ing quantity
*Key point
•
The target for the bobbin winding quan
tity
is filling 80 - 90% of the diameter..
Bobbin presser
112
114
Table of Contents
Default Chapter
4
Table of Contents
4
1 Outline of Mechanism
10
Main Mechanisms
11
Driveline
12
Positions of Electronic Components
13
Control System Block Diagram
14
Control System Block Diagram
15
Operation of Other Electronic Components
16
2 Disassembly
18
Main Parts
18
Accessory Table Removal
20
Bottom Cover Removal
20
Needle Plate B Assembly Removal
21
Needle Plate B ASSY Disassembly
21
Face Plate Assembly Removal
22
Face Plate a ASSY Disassembly
22
Front Cover Removal
23
Thread Tension Holder Assembly and Thread Take-Up Holder B Removal
24
Thread Tension Holder ASSY Disassembly
24
Thread Take-Up Holder B Disassembly
25
LED Lamp Removal
25
Operation PCB Assembly and SSVR PCB Assembly Removal
26
Button Removal
26
Front Panel and LCD Removal
26
SV Keytop Removal
27
Base Plate Rubber Removal
27
Upper Cover Thread Guide Removal
27
Main PCB Assembly Removal
28
Main PCB ASSY Disassembly
28
Power PCB Assembly Removal
29
Power PCB ASSY Disassembly
29
Inlet Assembly Removal
29
FC Jack Removal
30
Main Motor Assembly Removal
30
Main Motor ASSY Disassembly
30
Tension Pulley Assembly Removal
31
Tension Pulley ASSY Disassembly
31
Feed Unit Assembly Removal
31
Upper Shaft Assembly Removal
32
Needle-Presser Unit Removal
32
Plate Spring Removal
32
Bobbin Base Assembly Removal
33
Bobbin Base ASSY Disassembly
33
Bobbin Winder Assembly Removal
33
Spool Pin Removal
34
Bobbin Presser Removal
34
Thread Guide Assembly Removal
34
Base Plate Rubber Removal
35
Feed Unit
37
Needle Plate a Assembly Removal
37
Needle Plate a ASSY Disassembly
37
Spring Removal
37
Inner Rotary Hook Bracket Assembly Removal
37
Outer Rotary Hook Removal
38
Feed Dog Removal
38
Feed Bar Removal
39
Needle Plate Supporter Shaft B Removal
39
Feed Arm a Assembly Removal
40
Feed Arm B ASSY Disassembly
40
Feed Adjuster Assembly Removal
41
Feed Adjuster Disassembly
41
Vertical Lever Removal
41
FPM Holder Assembly Removal
42
FPM Disassembly
42
Timing Pulley D Removal
42
Lower Shaft Assembly Removal
43
Lower Shaft Bushing Removal
43
Needle-Presser Unit
45
Thread Take-Up Lever and Needle Bar Crank Removal
45
Threader Hook Assembly
45
Thread Take-Up Lever Link Removal
46
Needle Bar Assembly Removal
46
Needle Holder Assembly Removal
47
Needle Holder ASSY Disassembly
48
Presser Bar Removal
49
Z Zigzag Lever Assembly Removal
49
Z Zigzag Lever Disassembly
50
Z Zigzag Camp Removal
50
Shaft Bushing Removal
50
Presser Foot Lifter Removal
50
Thread Release Lever Removal
51
Lock Nut Removal
51
Z Pulse Motor Removal
51
Presser Switch Assembly Removal
51
3 Assembly
52
Main Parts
52
Base Plate Rubber Attachment
54
Thread Guide Assembly Attachment
54
Bobbin Presser Attachment
54
Spool Pin Attachment
55
Bobbin Winder Assembly Attachment
56
Bobbin Base Assembly Attachment
57
Bobbin Base ASSY Assembly
57
Plate Spring Attachment
57
Needle-Presser Unit Attachment
58
Upper Shaft Assembly Attachment
59
Feed Unit Assembly Attachment
60
Upper Shaft and Lower Shat Phase Matching
60
Tension Pulley Assembly Attachment
61
Tension Pulley ASSY Assembly
61
Main Motor Assembly Attachment
61
Main Motor Assembly
61
FC Jack Attachment
62
Inlet Assembly Attachment
62
Power PCB Assembly Attachment
63
Power PCB ASSY Assembly
63
Main PCB Assembly Attachment
64
Main PCB Assembly
64
Upper Cover Thread Guide Attachment
64
Base Plate Rubber Attachment
65
SV Keytop Attachment
65
Front Panel LCD Attachment
65
Button Attachment
66
Operation PCB Assembly and SSVR PCB Assembly Attachment
66
LED Lamp Attachment
67
Thread Tension Holder Assembly and Thread Take-Up Holder B Attachment
67
Thread Tension Holder ASSY Assembly
67
Thread Take-Up Holder B Assembly
68
Front Cover Attachment
69
Face Plate a Assembly Attachment
70
Face Plate a ASSY Assembly
70
Needle Plate B Assembly Attachment
71
Needle Plate B ASSY Assembly
71
Base Cover Attachment
71
Accessory Table Attachment
72
Feed Unit
74
Lower Shaft Bushing Attachment
74
Lower Shaft Assembly Attachment
74
Timing Pulley D Attachment
74
FPM Holder Assembly Attachment
75
FPM Assembly
75
Vertical Lever Attachment
76
Feed Adjuster Assembly Attachment
77
Feed Arm a Assembly Attachment
78
Feed Arm B ASSY Assembly
79
Needle Plate Supporter Shaft B Attachment
80
FPM Gear Engagement
81
Feed Bar Attachment
82
Shaft Supporter Attachment
82
Outer Rotary Hook Attachment
83
Vertical Adjuster Screw Assembly Attachment
83
Feed Dog Attachment
83
Inner Rotary Hook Bracket Assembly Attachment
84
Spring Attachment
84
Needle Plate a Assembly Attachment
84
Needle Plate a ASSY Assembly
84
Needle-Presser Unit
86
Presser Switch Assembly Attachment
86
Z Pulse Motor Attachment
86
Lock Nut Attachment
87
Thread Release Lever Attachment
87
Presser Foot Lifter Attachment
88
Shaft Bushing Attachment
88
Z Zigzag Cam Attachment
89
Z Zigzag Lever Assembly Attachment
90
Z Zigzag Lever ASSY Assembly
90
Presser Bar Attachment
91
Needle Holder Assembly Attachment
92
Needle Holder ASSY Assembly
93
Needle Bar Assembly Attachment
94
Needle Bar ASSY Assembly
94
Thread Take-Up Lever Link Attachment
94
Thread Take-Up Lever and Needle Bar Crank Attachment
95
BH Switch Assembly Attachment
95
LED Lamp Left Assembly
96
Threader Hook Attachment
96
4 Adjustment
98
Test Mode
99
Timing Belt Tension Adjustment
100
Motor Belt Tension Adjustment
101
Upper Thread Tension Adjustment
102
Three Point Needle Drop Adjustment
103
Needle Drop Position Adjustment for Needle Bar Unit and Rotary Hook Unit
104
Needle Interference Left/Right Adjustment
105
Needle Bar Rise Adjustment
106
Needle Bar Height Adjustment
107
Needle Interference Adjustment
108
Adjust the Needle Thread Block
109
Presser Bar Height and Parallel Adjustment
110
Inner Rotary Hook (Bobbin Thread) Tension
111
Feed Forward/Reverse Adjustment
112
Bobbin Winder (Uneven Bobbin Winding and Bobbin Winding Amounts) Adjustment
113
BH Lever Switch Position Adjustment
114
Forward and Back Adjustment of Needle and Presser
115
Feed Dog Forward/Reverse and Left/Right Adjustment
116
Feed Dog Height Adjustment
117
Inner Rotary Hook Bracket Position Adjustment
118
5 Special Instructions of Wiring
120
LED Lamp Right Supply Assy
121
Operation PCB Supply Assy and SSVR PCB Supply Assy
122
Operation PCB Supply Assy
123
Lead Wire Assy, FPM-LE
124
Lead Wire Assy, Power-LE
125
BH Switch Assy
126
LED Lamp Left Supply Assy
127
Needle Bar Unit
128
Upper Side of Shutter Cover
129
FC Jack Supply Assy
130
6 Failure Investigation for Electronic Parts
132
Error Message List
132
4
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Brother BC800 Specifications
General
Brand
Brother
Model
BC800
Category
Sewing Machine
Language
English
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