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HE-800A
Brother HE-800A Service Manual
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6. ELECT
RIC COM
PONENTS AND SOF
TWARE
HE-800A
125
6-4.
C
o
n
n
e
c
t
o
r
s
Most of the m
achine trouble is
due to connec
tor problem
s including im
proper connection or
suffic
ient contact.
Therefor
e, be sure to check
if each connector is c
orrectly inserted and t
hat there is no contac
t failure between pins
and wires bef
ore starting trou
bleshooting proc
edures.
6
-
4
-
1
. Connector positions
Main circuit boar
d
Sub circ
uit board
4370Q
4371Q
132
134
Table of Contents
Default Chapter
2
Safety Instructions
2
Notes on Safety
3
Maintenance and Inspection
4
Warning Labels
5
Table of Contents
6
1 Mechanical Descriptions
9
Needle Bar and Thread Take-Up Mechanisms ･･･････････････････････････････････1
9
Upper Shaft, Lower Shaft and Rotary Hook Mechanisms ･･･････････････････････････････････2
10
Needle Zigzag Mechanism ･･････････････････････3
11
Presser Foot Lifter Mechanism ････････････････････4
12
Feed Mechanism ･･･････････････････････････････5
13
Cutter Mechanism ･･････････････････････････････6
14
Thread Breakage Detection Mechanism ･･････････7
15
Lubrication Mechanism
16
Lower Shaft and Rotary Hook Lubrication ･･･････9
17
Tension Release Mechanism
18
Upper Thread Trimmer Mechanism
20
Upper Thread Scissors
22
Lower Thread Trimmer Mechanism
24
2 Disassembly ････････････････････････････････ ･･････････････････････････････････ ･･ ･･ ･･19
27
Covers
27
Rotary Hook Mechanism
28
Lubrication Mechanism (1)
29
Rotary Hook Lubricating Mechanism
29
Plunger Pump Mechanism
30
Oil Terminal Mechanism
31
Needle Zigzag Mechanism
32
Shaft Bush Mechanism
32
Thread Breakage Detection Mechanism
33
Upper Thread Trimmer Mechanism
34
Presser Bar Mechanism
36
Needle Bar and Thread Take-Up Mechanism (1)
37
Needle Bar and Thread Take-Up Mechanism (2)
38
Lubrication Mechanism (2)
39
Oil Tubes
39
Upper Shaft and Tension Pulley Mechanisms
40
Cutter Mechanism (1)
41
Cutter Mechanism (2)
42
Needle Zigzag Mechanism
43
Presser Lifter Mechanism (1)
44
Presser Lifter Mechanism (2)
45
Presser Lifter Mechanism (3)
46
Tension Release Mechanism (1)
47
Tension Release Mechanism (2)
48
Bobbin Presser Mechanism
49
Feed Mechanism (1)
50
Feed Mechanism (2)
52
Lower Thread Trimmer Mechanism (1)
53
Lower Thread Trimmer Mechanism (2)
54
Lower Shaft and Idle Pulley Mechanisms
55
3 Assembly ････････････････････････････････ ････････････････････････････････ ･･････････････････････････････････････ ･･････ ･･････48
56
Lower Shaft and Idle Pulley Mechanisms
56
Lower Thread Trimmer Mechanism (1)
57
Lower Thread Trimmer Mechanism (2)
58
Feed Mechanism (1)
59
Feed Mechanism (2)
61
Bobbin Presser Mechanism
62
Tension Release Mechanism (1)
63
Tension Release Mechanism (2)
64
Presser Lifter Mechanism (1)
65
Presser Lifter Mechanism (2)
66
Presser Lifter Mechanism (3)
67
Needle Zigzag Mechanism
68
Cutter Mechanism (1)
69
Cutter Mechanism (2)
70
Upper Shaft and Tension Pulley Mechanism
72
Lubrication Mechanism (1)
73
Oil Tubes
73
Needle Bar and Thread Take-Up Mechanisms (1)
74
Needle Bar and Thread Take-Up Mechanisms (2)
75
Presser Bar Mechanism
76
Upper Thread Trimmer Mechanism
77
Thread Breakage Detection Mechanism
79
Lubrication Mechanism (2)
80
Shaft Bush Mechanism
80
Needle Zigzag Mechanism
81
Oil Terminal Mechanism
82
Plunger Pump Mechanism
83
Rotary Hook Lubrication Mechanism
84
Rotary Hook Mechanism
85
Covers
85
4 Adjustment
86
Notes on Making Adjustments
86
Adjusting the Needle Zigzag Home Position Sensor Position
88
Adjusting the Feed Home Position Sensor Position
89
Adjusting the Work Clamp Home Position Sensor Position
90
Adjusting the Needle Bar Height
91
Adjusting the Needle and Hook Timing
91
Needle and Hook Point
92
Adjusting the Inner Rotary Hook and Rotary Hook Holder Overlap
93
Adjusting the Work Clamp Pressure
93
Adjusting the Work Clamp Lift Amount
93
Adjusting the Work Clamp Lateral Position
94
Adjusting the Cutter Home Position Sensor Position
94
Adjusting the Cutter Installation Position
95
When Using the Special Needle Plate
96
(Needle Plate -RB)
96
Adjusting the Cutter Installation Height
96
Adjusting the Upper Thread Trimming
97
Adjusting the Longitudinal Feed Arm
97
Adjusting the Trimmer Driving Arm
97
Adjusting the Lateral Position of the Upper
97
Adjusting the Longitudinal Position of the Upper Thread Scissors
97
Adjusting the Cutting Depth of the Upper
97
Assembly Position
98
Thread Scissors at the Sewing Start
99
Thread Scissors
100
Adjusting the Installation Height of the Upper Thread Scissors
101
Adjusting the Upper Thread Scissors Gradual Opening Timing
102
Adjusting the Upper Thread Scissors Opening Timing
103
Adjusting the Lower Thread Trimming
104
Adjusting the Lower Thread Trimmer Fixed
104
Knife Engagement Amount
104
Adjusting the Lower Thread Retaining
104
Adjusting the Lower Thread Clamp Opening Timing
105
Adjusting the Lower Thread Clamp Opening Amount
106
Adjusting the Bobbin Presser
106
Adjusting the Thread Breakage Detector
107
Adjusting the Thread Tension at the Tack Tension Control
108
Adjusting the Thread Tension at the Zigzag Tension Control
108
Adjusting the Upper Thread Feeding Amount
109
Adjusting the Feed Timing Belt
109
Adjusting the Upper Shaft Timing Belt
110
Adjusting the Rotary Hook Lubrication
110
Adjusting the Needle up Stop Position
111
Adjusting the V-Belt Tension
111
5 Troubleshooting
112
Upper Thread Breakage
112
Skipped Stitches
113
Uneven Seams
114
At the Sewing Start
114
Lower Thread Is Lifted up at the Sewing Start
115
Uneven Seams
116
Seam Lifts up at the Sewing Start
116
Uneven Sewing Pitch at the Sewing Start
116
Poor Rounding of Seam
116
Around Rear Tack or Front Tack
116
Uneven Seams
117
Loose Thread End at End Backtack
117
Thread Sticking out at End Backtack
117
Sticking in Needle Plate
117
Uneven Seams
118
All Stitches
118
Upper Thread Run out
119
Unraveling of Thread Trimmed by Upper Thread Trimmer Assembly
121
Upper Thread Mis-Trimming
122
Needle Strikes Upper Thread Trimmer
122
Needle Breakage
123
Imperfect Cutter Function (Imperfect Material Cutting)
124
Cutter Does Not Return
125
Cutter and Upper Thread Scissors Touch
125
Seam Is Cut
125
Upper Thread Mis-Winding
126
Work Clamp Is Not Raised
126
Work Clamp Is Not Raised
127
Lower Thread Is Not Trimmed (Pulls When Material Is Removed)
128
Feed Mechanism Does Not Operate or Motor Is out of Step
128
Needle Does Not Zigzag or Noise Occurs When Needle Zigzags
129
Sewing Machine Stops During Sewing
129
Upper Shaft Does Not Rotate as Far as the Needle up Stop Position
129
6 Electric Components and Software
130
Precautions at the Time of Adjustment
130
Components Inside the Control Box and the Operation Panel
131
Fuse Explanation
132
Connectors
133
Connector Positions
133
Signal Names for Connectors and
135
Contact
135
Description of DIP Switches
147
Panel DIP Switches
147
Circuit Board DIP Switches
149
Description of Machine Motor Parameters
151
Input Check List
152
Output Check List
155
Error Code Table
156
Control Circuit Block Diagram
161
Other manuals for Brother HE-800A
Instruction Manual
118 pages
Parts Manual
80 pages
User Manual
118 pages
Catalog
12 pages
Operation Manual
4 pages
5
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Brother HE-800A Specifications
General
Brand
Brother
Model
HE-800A
Category
Sewing Machine
Language
English
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