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Sewing Machine
JS1420
Brother JS1420 User Manual
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Basic of Disassembly
2 - 2
Preparation
Basic of
Disassembly
Basic of
Disassembly
1
Disconnecting cables
& Removing accessories
•
Foot controller socket
•
Needle
•
Presser foot
•
Accessory table
•
Slide plate
•
Bobbin
Foot controller socket
Accessory table
Bobbin
Slide plate
Presser foot
Needle
13
15
Table of Contents
Table of Contents
4
1 Outline of Mechanism
7
Main Mechanisms
8
Driveline
9
Positions of Electronic Components
11
Control System Block Diagram
12
Disassembly Preparation
14
Disconnecting Cables & Removing Accessories
14
Main Frame and Covers
15
Main Frame and Covers
16
Removal of Face Plate Assy and Front Cover Assy
16
Removal of Rear Cover Assy and Base Plate L/R
17
Main Motor Unit
19
Main Motor Unit
20
Removal of LED Lamp Assy
20
Removal of Motor 3P Supply Assy
21
Feed Unit / Feed Control
22
Feed Unit / Feed Control
23
Removal of Tension Pulley Assy and Lower Shaft B Assy
23
Removal of Feed Module
24
Removal of Feed Connecting Lever Assy
25
Needle Threading Mechanism
26
Needle Threading Mechanism
27
Removal of Thread Tension Dial Assembly
27
Pattern Selecting Mechanism
28
Pattern Selecting Mechanism
29
Removal of Pattern Selecting Unit Assy
29
Bobbin Winder, Upper Shaft, Needle-Presser Module
30
Bobbin Winder, Upper Shaft, Needle-Presser Module
31
Removal of Bobbin Winder Assy
31
Removal of Upper Shaft Assy
32
Bobbin Winder, Upper Shaft, Needle-Presser Module
32
Bobbin Winder, Upper Shaft, Needle-Presser Module
35
Attachment of Needle-Presser Module
36
Attachment of Upper Shaft Assy
38
Attachment of Bobbin Winder Assy
39
Pattern Selecting Mechanism
40
Lubrication
41
Attachment of Pattern Selecting Unit Assy
42
Needle Threading Mechanism
44
Attachment of Thread Tension Dial Assembly
45
Feed Unit / Feed Control
46
Lubrication
47
Attachment of Feed Connecting Lever Assy
48
Attachment of Feed Module
49
Attachment of Lower Shaft B Assy and Tension Pulley Assy
50
Phase Matching of Upper Shaft and Lower Shaft
51
Main Motor Unit
52
Attachment of Motor 3P Supply Assy
53
Attachment of LED Lamp Assy
54
Main Frame and Covers
55
Attachment of Rear Cover Assy and Base Plate L/R
56
Attachment of Face Plate Assy and Front Cover Assy
58
3 Application of Disassembly/Assembly
59
Main Frame and Covers
60
Disassembly of Face Plate Assy
61
Disassembly of Rear Cover Assy
62
Disassembly of Base Plate L/R
63
Main Motor Unit
64
Disassembly of Motor 3P Supply Assy
65
Feed Unit
66
Disassembly of Tension Pulley Assy
67
Disassembly of Lower Shaft B Assy
68
Disassembly of Feed Module
69
Needle Threading Mechanism
77
Disassembly of Thread Tension Dial Assembly
78
Pattern Selecting Mechanism
79
Disassembly of Pattern Selecting Unit Assy
80
Bobbin Winder, Upper Shaft, Needle-Presser Module
81
Disassembly of Bobbin Winder Assy
82
Disassembly of Upper Shaft Assy
83
Disassembly of Needle-Presser Module
84
Bobbin Winder, Upper Shaft, Needle-Presser Module
88
Lubrication
89
Assembly of Needle-Presser Module
90
Assembly of Upper Shaft Assy
94
Assembly of Bobbin Winder Assy
95
Pattern Selecting Mechanism
96
Lubrication
97
Assembly of Pattern Selecting Unit Assy
98
Needle Threading Mechanism
99
Assembly of Thread Tension Dial Assembly
100
Feed Unit
101
Lubrication
102
Assembly of Feed Module
103
Assembly of Lower Shaft B Assy
111
Assembly of Tension Pulley Assy
112
Main Motor Unit
113
Assembly of Motor 3P Supply Assy
114
Main Frame and Covers
115
Assembly of Base Plate L/R
116
Assembly of Rear Cover Assy
117
Assembly of Face Plate Assy
118
4 Adjustment
119
Default Chapter
120
Removal of Covers
120
Needle Point Damage
122
Adjustment Timing Belt Tension
123
Motor Belt Tension
124
Needle Plate Holder Assy Position
125
Presser Foot Hole / Needle Plate Hole Position (Front/Back)
126
Needle Swing Timing
127
Three Point Needle Drop
128
Needle Interference Left/Right
129
Needle Bar Rising
130
Needle Bar Height
132
Needle Clearance
133
Left Straight Stitch Needle Drop and Zigzag Stitch Maximum Left Needle Drop Position
134
Feed Dog Position (Front/Back and Left/Right)
136
Feed Dog Height
137
Upper Thread Tension
138
Left and Right Stitch of Buttonhole Stitch Length
140
Left and Right Stitch of Buttonhole Stitch Length
141
Bobbin Winder
143
Lower Thread Tension
144
5 Failure Investigation for Electronic Parts
145
Sewing Lamp Does Not Light
146
Main Motor Does Not Turn or Rotation Speed Is Slow
147
6 Special Instructions of Wiring
148
Motor 3P Supply Assy
149
LED Lead Wire
150
4
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Brother JS1420 Specifications
General
Brand
Brother
Model
JS1420
Category
Sewing Machine
Language
English
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