Brother LH4-B800E Service Manual Page 20
- Page / 168
- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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LH4-B800E
1 - 13
1. MECHANISM DESCRIPTION
1. When the pulse motor
q
operates, the gear
w
that is installed to the pulse motor shaft engages with the presser driving arm
e
so that the
guide bracket
r
moves along the guide shaft
t
and moves the presser driving arm
e
in the direction of the arrow.
2. The presser driving arm
e
causes the presser foot lifter connecting rod
y
to move in the direction of the arrow.
3. The movement of the presser foot lifter connecting rod
y
is transmitted via the knee lifter lever
u
to move the upper thread trimmer driving
link
i
in the direction of the arrow.
4. The driving lever roller
!3
and ball bearing
!4
that are installed to the ends of the trimmer driving levers
o
and
!0
by the shoulder screws
!1
and
!2
are linked to the cam groove in the upper thread trimmer driving link
i
so that when the upper thread trimmer driving link
i
moves
in the direction of the arrow, the trimmer driving levers
o
and
!0
operate.
5. When the trimmer driving levers
o
and
!0
operate, the longitudinal feed arm
!5
and trimmer driving arm
!6
that are secured to the trimmer
driving levers
o
and
!0
move in the direction of the arrow.
6. When the longitudinal feed arm
!5
operates, the upper thread trimmer lever
!8
that is attached to the longitudinal feed arm roller
!7
at the end
of the longitudinal feed arm
!5
moves back and forth.
7. When the trimmer driving arm
!6
operates, the driving arm roller
!9
that is installed to the trimmer driving arm
!6
rolls along the cam groove
in the upper thread trimmer lever
!8
, and the upper thread trimmer lever
!8
rotates centering on the upper thread trimmer fulcrum shaft
@0
.
8. The setting plate
@1
is secured to the end of the upper thread trimmer lever
!8
, and so the movement is transmitted to the upper thread
trimmer assembly
@2
that is secured to the setting plate
@1
.
9. Upper thread trimmer M
@3
that is installed to the upper thread trimmer assembly
@2
comes into contact with the work clamp, so that upper
thread trimmer M
@3
closes and cuts the thread.
w
q
u
y
!2
!1
!5
!4
t
r
e
!0
o
i
!3
!6
@0
@1
!7
!8
!9
@2
@3
- 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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