Brother LH4-B800E Service Manual Page 64
- Page / 168
- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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LH4-B800E
3 - 9
3. ASSEMBLY
Connect the adjusting lever q, lever link w and tension take-up lever e with the two shoulder screws r. Install the
lever t to the adjusting lever q with the screw y and the washer u. (Tension lever take-up assembly i)
Insert the washer o into the bottom of the tension lever take-up assembly i, and then install the tension lever take-
up assembly i to the arm with the shoulder screw !0. Install the tension lever take-up assembly i to the tension
release shaft !3 with the screw !1 and the washer !2.
Place the two tension discs !4, tension disc presser !5, tension disc presser !6, tension adjusting spring !7, washer !8
and tension nut !9 onto the sub tension stud @0. (Sub thread tension assembly @1)
Insert the tension release pin @2 into the sub thread tension assembly @1, and then install the sub thread tension
assembly @1 to the arm.
To adjust the thread tension, turn on the power. After the mechanism moves to the home position, press the RESET
key to lower the presser foot.
Loosen the screw @3, and then adjust the thread tension by adjusting the clearances between the tension release cam
@4 and the tension release pin @2 as shown in the illustration.
Press the RESET key to raise the presser foot, and then check that the opening clearance between the tension discs
is 0.5 to 1 mm. Then, press the RESET key again to lower the presser foot, and check that the tension discs are firmly
closed.
Place the tension discs @5, tension disc presser @6 and tension disc presser @7 onto the tension stud @8. Place the
collar @9 onto the tension stud @8 as far in as it will go. Place the tension spring #0 and the washer #1 onto the tension
stud @8. Then tighten the tension nut #2. (Tension stud assembly #3)
Insert the tension release pin @2 into the tension stud assembly #3. Provisionally install the tension release lever
bracket #4 to the tension stud assembly #3. Then attach the spring #5. Install the tension release lever #6 with the
shoulder screw #7 so that the spring #5 is straight. Then fully tighten the tension stud assembly #3.
0
1
4
2
3
0
1
4
2
3
0
1
4
2
3
0
1
4
2
3
t
r
e
q
!0
o
i
u
y
!5
!4
!3
!2
!1
!9
!8
!7
!6
w
#0
@5
@7
@8
#2
#3
#5
#1
@6
#6
@9
#4
0.1 - 0.3 mm
0.3 - 0.5 mm
i
@0
@1
@2
@3
@4
@4
#7
- 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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