Brother LH4-B800E Service Manual Page 75
- Page / 168
- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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LH4-B800E
3 - 20
3. ASSEMBLY
Install the presser bar lifter link
q
to the presser bar guide bracket
e
with the shoulder screw
w
. Install the set screw
r
to the presser bar guide
bracket
e
. (Presser bar guide bracket assembly
t
)
Install the upper thread trimmer driving link
y
and the knee lifter lever
u
with the shoulder screw
i
. (Lifter shaft assembly
o
)
Install the roller
!0
to the roller shaft
!3
with the plain washer
!1
and the retaining ring
!2
. Install the roller shaft
!3
to the presser roller bracket
!4
.
Secure the roller shaft
!3
by tightening the set screw
!5
.
Provisionally install the needle bar guide
!6
to the arm with the screw
!7
as shown in the illustration.
Insert the presser bar
!8
into the arm, and then pass it through the oil rejector
!9
and the presser bar guide bracket assembly
t
.
Position the needle bar guide
!6
so that the presser bar
!8
moves smoothly, and then secure it by tightening the screw
!7
. Tap in the rubber cap
@0
. Install the presser roller bracket
!4
to the presser bar
!8
with the screw
@1
.
Connect the presser bar guide bracket assembly
t
and the knee lifter lever
u
with the shoulder screw
@2
.
Place a 10 mm gauge
@4
underneath the work clamp
@3
.
Turn on the power. After the mechanism moves to the home position, check that the setting for memory switch No. 05 (presser foot height at neutral
position) is 10 mm. (If it is not set to 10 mm, set it to 10 mm.)
While pushing the presser bar
!8
down from above, tighten the set screw
r
so that the roller
!0
is not at an angle to the V-shaped groove in the
presser arm
@5
. Then remove the gauge
@4
and turn off the power.
Insert the spring guide
@6
, compression spring
@7
and plain washer
@8
, and with the presser adjusting screw
@9
at a height of 30 mm, tighten the
presser adjusting nut
#0
.
3-11. Presser bar mechanism
t
r
e
w
q
u
y
!0
o
i
!3
!2
!1
Align edges
Apply grease to !3
Bottom
!5
!4
Top
u
@1
!4
t
@0
!9
!8
!7
!6
@2
r
!0
!8
@4
@5
#0
@8
@9
@6
@7
@3
10 mm
30 mm
Install with !9 at the top
!7
!6
t
t
@3
10 mm
@9
!5
- 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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