Brother LH4-B800E Service Manual Page 57
- Page / 168
- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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LH4-B800E
3 - 2
3. ASSEMBLY
Insert the roller shaft
q
into the lower thread trimmer cam lever
w
, and secure it by tightening the nut
e
. Place the roller
r
onto
the roller shaft
q
, and then install the retaining ring
t
.
Install the lower thread trimmer cam connecting rod
y
to the lower thread trimmer cam
o
with the driving lever roller
u
and the
shoulder screw
i
. (Lower thread trimmer cam assembly
!1
)
Install the cover
!0
to the bed.
Pass the lower thread trimmer cam assembly
!1
through the cover
!0
and install it to the bed with the two lever shafts
!2
. Tighten
the two set screws
!3
so that the lower thread trimmer cam assembly
!1
moves smoothly without any play.
Insert the roller
r
into the lower thread trimmer cam
o
, and then install it to the bed with the lower thread trimming cam shaft
!4
,
washer
!5
and retaining ring
!6
. Secure by tightening the set screw
!7
.
Connect the presser lifter connecting rod set
!8
and the lower thread trimmer cam lever
w
using plain washer D
@0
, and the bolt
@1
.
Install the lower thread trimmer link assembly
@2
with the shoulder screw
@3
.
Connect the lower thread trimmer link assembly
@2
and the lower thread trimmer cam connecting rod
y
with the shoulder screw
@4
.
Install the opening plate assembly
@5
with the shoulder screw
@6
. Install the plate spring
@7
as shown in the illustration.
3-2. Lower thread trimmer mechanism
t
r
e
w
q
o
i
u
y
!7
!6
!6
!0
!3
!2
!1
Apply grease to !2
r
o
!5
!5
!4
!4
Apply grease to cam groove
o and to !4
Apply grease to !9
Apply grease to @3
@0
!9
!8
@1
@2
@3
y
@2
@4
@5
@6
@7
!1
!7
w
- 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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