Brother LH4-B800E Service Manual page 139

6. ELECTRIC MECHANISM
Circuit board connectors
<Main circuit board>
P1 [FAN2]
Pin No.
1 +24V
2 FAN2 signal
3 0V
P3 [SYNC]
Pin No.
1 +5V
2 Encoder signal
3 Needle up stop position signal
4 Needle down stop position signal
5 0V
P4 [PANEL]
Pin No.
1 +5V
2 0V
3 KEY0
4 KEY1
5 KEY2
6 OC
7 A
8 B
9 C
10 D
11 E
12 F
13 G
14 STB
15 P8V
16 SENSOR
17 BUZZER
18 0V
19 0V
20 0V
6 - 6
Signal name
Signal name
Signal name
Symptoms resulting mainly from poor contact
The inside air circulation fan does not operate.
Error E-41 is displayed.
Symptoms resulting mainly from poor contact
The machine motor does not turn.
A machine stopping error occurs.
One of error E-02, E-62, E-63 and E-64 is displayed.
Symptoms resulting mainly from poor contact
The panel does not operate.
LH4-B800E