Brother LZ2-B855E Service Manual page 64

8. ELECTRIC COMPONENTS
Control circuit board
< If fuse F1 is blown >
Problem : Error EE5 appears.
Before replacing a fuse, separate connector (P18) on the control circuit board and measure the resistance as shown in
the table.
Pin No.of P18 connector of harness side
6 and 12
7 and 14
8 and 13
9 and 11
10 and 15
If the resistances are no good, replace the blown solenoids.
Pin No.of P18 connector of PCB side
1 and 10
16 and 11
16 and 13
16 and 14
If the resistances are good, replace the blown fuse. (Name of part of the fuse F1 -"GLASS FUSE, 8A"
CODE–S47680000)
If the resistances are no good, replace the control circuit board.
< If fuse F2 is blown >
Replace the control circuit board. (There is a possibility that the component on the control circuit board is damaged.)
8-05
P6
P4
P3
F1
P1
P20
P18 connector of harness side
1 and 6
1 and 7
1 and 8
1 and 9
P7
P16
P18
1 18
1 18
Solenoid
Thread trimming (B856E)
Thread wiper (B856E)
Reverse feeding (B855E/BT,B856E)
Presser foot lifter (B856E)
Upper thread feeding (B856E)
No good resistance
Short-circuit (a little Ω)
LZ2-B855E,B856E
1146S
P11
P13
P14
P15
F2
Good resistance
Approx. 7Ω
Approx. 6Ω
Approx. 7Ω
Approx. 9Ω
Approx. 17Ω