Brother LH4-B800E Service Manual Page 136
- Page / 168
- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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LH4-B800E 6 - 3
6. ELECTRIC MECHANISM
6-3. Fuse explanation
If a component on a PCB is damaged, a fuse may blow again immediately even when it has been replaced.
When replacing a fuse, be sure to use the specified ones listed below.
* F2 may also blow as a result of a malfunction of the peripheral electronic component FET.
Main circuit board
1-step power supply
circuit board
2-step power supply
circuit board
F1
F2
F1
F2
F3
F4
F1
F2
F3
Circuit board No. Part name Part code When a fuse has blown Voltage
Main circuit
board
F1
GFUSE8A
(glass tube fuse,
8A/250V)
S47680-000
The tension release solenoid does
not operate.
+40V
F2
GFUSEAFB
(glass tube fuse,
8A/250V(FB))
S47717-000 The zigzag motor does not operate. DC300V
1-step power
supply circuit
board
F1, F2
Fuse
15A#2
(glass tube fuse,
15A/250V)
218469-001
The zigzag motor does not operate.
The tension release solenoid does
not operate.
The panel does not operate.
The control box fan does not
operate.
AC200V
F3, F4
Fuse
2A250V
(glass tube fuse,
2A/250V)
J02727-001
The feed motor and presser foot
motor do not operate.
The cutter solenoid does not
operate.
The panel does not operate.
DC300V
2-step power
supply circuit
board
F1
G fuse 5AFB
(quick melting
type, 5A/250V)
S08030-000
The feed motor and presser foot
motor do not operate.
The cutter solenoid does not
operate.
+55V
F2
Fuse 6A
(glass tube fuse,
6A/250V)
153242-000
The feed motor and presser foot
motor do not operate.
The cutter solenoid does not
operate.
AC200V
F3
Fuse 6A
(glass tube fuse,
6A/250V)
153242-000
The feed motor and presser foot
motor do not operate.
The cutter solenoid does not
operate.
AC200V
Open the cover. The fuses are mounted to the circuit boards as shown.
- 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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