Brother LH4-B800E Service Manual Page 165
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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LH4-B800E6 - 32
6. ELECTRIC MECHANISM
Code Countermeasure
E-62
<Software>
1. If the sewing machine stops before the needle up position, reduce the setting value for machine
motor parameter No. 00 (machine motor stopping position).
2. If the sewing machine stops after the needle up position, increase the setting value for machine
motor parameter No. 00 (machine motor stopping position).
<Hardware>
1. Turn the machine pulley by hand and check if the upper shaft locks or not.
(If it locks, remove the cause of the problem.)
2. Check if connector P3 on the main circuit board is securely inserted and if any harness is
broken or short-circuited.
3. Check if the machine motor harnesses are securely inserted and if any harness is broken or
short-circuited.
4. Replace the synchronizer.
5. If there is still an error even after replacing the synchronizer, replace the main circuit board.
E-63
E-64
1. Turn the machine pulley by hand and check if the upper shaft locks or not.
2. Check if connector P3 on the main circuit board is securely inserted and if any harness is
broken or short-circuited.
3. Replace the synchronizer.
4. If there is still an error even after replacing the synchronizer, replace the main circuit board.
E-74 1. Replace the main circuit board.
E-75 1. Replace the main circuit board.
E-80
E-81
1. Make sure that ROM chips of the main circuit board are correctly inserted. (Check position,
orientation, lead clinching.)
2. Replace the main circuit board.
E-90
E-92
E-94
1. Turn the machine pulley by hand and check if the upper shaft locks or not.
2. Check if connectors P3 and P6 on the main circuit board are securely inserted and if any
harness is broken or short-circuited.
3. Check if machine motor harness connector CN7 and power supply harness connector CN8 on
the 1-step power supply circuit board are securely inserted and if any harness is broken or
short-circuited.
4. Replace the 1-step power supply circuit board.
5. Replace the main circuit board.
E-93
1. Check fuse F1 on the main circuit board.
2. If fuse F1 on the main circuit board is blown, replace it.
- 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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