Fuse Explanation - Brother LH4-B800E Service Manual

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.
Circuit board No.
F1
Main circuit
board
F2
F1, F2
1-step power
supply circuit
board
F3, F4
F1
2-step power
supply circuit F2
board
F3
* F2 may also blow as a result of a malfunction of the peripheral electronic component FET.
Open the cover. The fuses are mounted to the circuit boards as shown.
Main circuit board
F2
Part name Part code
GFUSE8A
(glass tube fuse, S47680-000
8A/250V)
GFUSEAFB
(glass tube fuse, S47717-000
8A/250V(FB))
Fuse
15A#2 218469-001
(glass tube fuse,
15A/250V)
Fuse
2A250V J02727-001
(glass tube fuse,
2A/250V)
G fuse 5AFB
(quick melting S08030-000
type, 5A/250V)
Fuse 6A
(glass tube fuse, 153242-000
6A/250V)
Fuse 6A
(glass tube fuse, 153242-000
6A/250V)
F1
F4
When a fuse has blown
The tension release solenoid does
not operate.
The zigzag motor does not operate. DC300V
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.
The feed motor and presser foot
motor do not operate.
The cutter solenoid does not
operate.
The panel does not operate.
The feed motor and presser foot
motor do not operate.
The cutter solenoid does not
operate.
The feed motor and presser foot
motor do not operate.
The cutter solenoid does not
operate.
The feed motor and presser foot
motor do not operate.
The cutter solenoid does not
operate.
1-step power supply
circuit board
F3
F1
F2
LH4-B800E
6. ELECTRIC MECHANISM
Voltage
+40V
AC200V
DC300V
+55V
AC200V
AC200V
2-step power supply
circuit board
F1
F2
F3
6 - 3