Brother LH4-B800E Service Manual Page 76
- Page / 168
- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
Rated. / 5. Based on customer reviews
LH4-B800E
3 - 21
3. ASSEMBLY
Insert the upper thread trimmer fulcrum shaft q into the arm. Secure the upper thread trimmer fulcrum shaft q with the set screw collar
assembly w so that it turns smoothly. Install the rubber cap e from the top of the arm.
Install the spring hook plate r to the upper thread trimmer lever assembly y with the screw t. Attach the spring u to the stop plate i as
shown in the illustration. Install the back plate o and the stop plate i to the upper thread trimmer lever assembly y with the two collars
!0 and the two screws !1. Apply grease to the sliding surfaces.
Install the support stud !2 to the setting plate !5 with the nut !3 and the plain washer !4. Install the setting plate !5 to the upper thread
trimmer lever assembly y with the screw !6 and the plain washer !7.
Press-fit the longitudinal feed arm pin !8 onto the longitudinal feed arm !9. Secure it by tightening the set screw @0. Install the bolt @1. Place
the longitudinal feed arm roller @2 onto the longitudinal feed arm pin !8 and secure it with the two retaining rings @3. (Longitudinal feed arm
assembly)
Install the eye bolt @4 to the trimmer driving arm @5. Install the roller shaft @6 to the support plate @9 with the nut @7 and the spring washer
@8. Place the driving arm roller #0 onto the roller shaft @6. Secure the driving arm roller #0 with the retaining ring #1. Install the support plate
@9 and the stopper #2 to the trimmer driving arm @5 with the eye bolts #3 and the plain washers #4. (Trimmer driving arm assembly)
Install the upper thread trimmer lever set #5 to the upper thread trimmer fulcrum shaft q with the two washers #6 and shoulder screws #7.
Place the roller #8 onto the support stud !2 of the upper thread trimmer lever set #5, and then place it into the groove in the presser roller
bracket #9.
Pass the longitudinal feed arm pin !8 of the longitudinal feed arm assembly $0 through the upper thread trimmer lever set #5, and
provisionally install it to the trimmer driving lever $1 with the eye bolt @1. Provisionally install the trimmer driving arm assembly $2 to the
trimmer driving lever $3 with the eye bolt @4.
Turn on the power. After the mechanism moves to the home position, press the RESET key to lower the presser foot.
Tighten the eye bolt @1 of the longitudinal feed arm assembly $0 so that the slot of the upper thread trimmer lever set #5 and the edge of the
washer #6 are aligned. Tighten the eye bolt @4 so that the stop plate i and the stopper #2 are in the positions shown in the illustration.
Attach the two springs $4 to the upper thread trimmer lever set #5. Attach the larger hooks of the springs $4 to the pins $5 on the arm.
3-12. Upper thread trimmer mechanism
e
w
q
Apply grease to q
t
r
!0
o
i
i
u
u
y
!5
!4
!3
!2
!1
!7
!6
@0
!9
!8
@1
@2
@3
Apply grease to @2
#0
@5
@7
@9
#2
#3
#4
#1
@6
@8
#3
@4
#4
Apply grease to #0
!2
#5
#7
#8
#6
Apply grease to #7 and #8
Aligned
i
!8
$0
@4
#2
#5
@1
#6
#5
Approx. 1 mm
#5
$5
$4
Align edges
#9
$1
$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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