Brother LH4-B800E Service Manual download pdf (Page 14)

LH4-B800E

1 - 7

1. MECHANISM DESCRIPTION

1-7. Thread breakage detection mechanism

1. The cutter bar fixed plate assembly q and the thread guide w are secure to the thread breakage perceiving shaft

e. When a thread breakage occurs, the cutter bar fixed plate assembly q drop by its own weight and moves the

thread guide w in the direction of the arrow.

2. When the sensor r detects the cutter bar fixed plate assembly q, the sewing machine stops and the cutter is

prevented from dropping.

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 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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Brother LH4-B800E Service Manual Page 14

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