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LH4-B800E
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Brother LH4-B800E Service Manual Page 77
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Table of contents
TROUBLESHOOTING
BOOKMARKS
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LH4-B800E
3 - 22
3. ASSEMBLY
Install the upper thread trimmer assembly
q
to the upper thread trimmer lever
w
with the screw
r
, spring washer
t
and plain washer
y
.
t
r
w
q
y
1
2
...
72
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...
167
168
SERVICE MANUAL
1
CAUTION
2
Environmental requirements
3
Installation
3
Cleaning
4
Maintenance and inspection
4
CONTENTS
6
1. MECHANISM DESCRIPTION
8
Direction of
9
1-3. Needle zigzag mechanism
10
1-5. Feed mechanism
12
1-6. Cutter mechanism
13
1-8. Lubrication mechanism
15
Presser foot
19
Figure A
21
Figure B
21
2. DISASSEMBLY
26
2-3. Feed mechanism
29
2-4. Bobbin presser mechanism
32
2-6. Presser lifter mechanism
35
2-7. Needle zigzag mechanism
38
2-8. Cutter mechanism
39
2-11. Presser bar mechanism
44
2-14. Lubrication mechanism
48
Shaft bush mechanism
48
Needle zigzag mechanism
49
Oil tubes
50
Oil terminal mechanism
51
Plunger pump mechanism
52
2-15. Rotary hook mechanism
54
3. ASSEMBLY
56
BackForward
58
Apply grease to cam groove i
58
Apply grease to !0
58
Press down
58
3-3. Feed mechanism
59
[For long-hole]
60
[-2 specifications]
60
3-4. Bobbin presser mechanism
62
3-6. Presser lifter mechanism
65
19.6 0.3
66
Apply grease to !9
67
Apply grease
67
3-7. Needle zigzag mechanism
68
3-8. Cutter mechanism
69
(Screw stop side)
73
Place onto projection
74
3-11. Presser bar mechanism
75
3-14. Lubrication mechanism
79
3-15. Rotary hook mechanism
86
4. ADJUSTMENT
88
0.01 - 0.08 mm
94
4.5 0.5 mm
96
LH4-B800E
100
Approx. 1 mm
101
Clearance 0--0.5 mm
102
0.5 mm0.5 mm
104
6 - 7 mm
107
Reference line A
107
Approx. 5 mm
109
0.1 - 0.3 mm
112
0.3 - 0.5 mm
112
F = 98 N (10 kgf)
113
10 - 14 mm
115
5. TROUBLESHOOTING GUIDE
116
(Instruction)
117
5-2. Skipped stitches
118
1 - 2 mm
120
63 64 65 66
121
5. Troubleshooting guide
122
5-8. Needle thread runout
123
Check burr on upper
125
Check burr here
125
5-12. Needle breakage
127
(2) Cutter does not return
128
6. ELECTRIC MECHANISM
134
6-3. Fuse explanation
136
6-4. Connectors
137
LH4-B800E 6 - 5
138
Panel PCB
138
LH4-B800E6 - 6
139
Circuit board connectors
139
<Main circuit board>
139
LH4-B800E6 - 8
141
LH4-B800E6 - 10
143
P12 [FAN2]
149
1 +24V Special edition
149
2 Spare input
149
LH4-B800E6 - 18
151
6-7. ERROR CODE TABLE
160
LH4-B800E6 - 28
161
6-8. Troubleshooting
162
LH4-B800E6 - 30
163
LH4-B800E 6 - 33
166
Control box
167
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