Brother LH4-B800E Service Manual Page 122
- Page / 168
- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
Rated. / 5. Based on customer reviews
LH4-B800E
5 - 7
5. Troubleshooting guide
5-7. Uneven seams 5)......All stitches
(B)(A)
Stopper should not
protrude from inner
rotary hook.
Cause Check Solution page
Threading Needle thread
threading
Refer to "5-1. Needle thread breakage"
Bobbin thread
threading
Needle Needle attachment Reattach needle
properly
Insert needle fully into needle bar -
(Instruction)
Needle number count Replace needle with
thicker one
-
Thread chips
or dust
Rotary hook rim
Rotary hook edge
Around needle plate
hole
Remove thread chips
or dust
-
Needle
thread
Needle thread tension Increase needle thread
tension
Adjust tension while checking
stitches
-
Thread and needle Replace needle with
one that fits for the
thread
-
Rotary hook
holder
Flaws on rotary hook
holder
Refer to "5-1. Needle thread breakage"
Rotary hook stopper
and inner rotary hook
overlap amount
Adjust the rotary hook
stopper and inner
rotary hook overlap
amount
4-8
Rotary hook Lubrication Decrease the quantity
of lubrication oil
Adjust it with oil adjusting shaft
Check the quantity of lubrication as
follows; When the number of
stitches is about 114, sew 20 - 30
stitches and using the craft paper
check that the number of splashed
oil spots is about 10
Too small quantity of lubrication oil
will cause thread breakage
4-27
Bobbin
winder thread
guide
Bobbin thread tension Adjust the tension on
the bobbin winder
guide
Decrease the tension to such a
degree that it does not cause
bobbin thread winding turbulence
-
Uneven bobbin
winding
Move bobbin winder
guide up and down to
adjust its position
Move it up in case (A)
Move it down in case (B)
-
(Instruction)
Bobbin
thread
Bobbin thread tension Adjust the bobbin
thread tension
-
(Instruction)
Bobbin case Refer to "5-1. Needle thread breakage"
Stitch
patterns
Purl stitch, Whip stitch Parameter No. 11
setting
-
(Instruction)
- 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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