Brother LH4-B800E Service Manual download pdf (Page 90)

LH4-B800E

4 - 3

4. Adjustment

(1.5)

2 mm

4-2. Adjusting the feed home position sensor position

1. Turn on the power and set the sewing machine to the home position. Then press the RESET key to lower the

presser foot.

2. If the clearance between the feed arm support q and the linear bushing w is 2 mm, the following adjustment is

not necessary. If the clearance is not 2 mm, turn off the power.

3. Loosen the screw e and adjust the position of the feed sensor support plate r.

4. Repeat the procedure from step 1.

1 2 ... 85 86 87 88 89 90 91 92 93 94 95 ... 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 90

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