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Brother LH4-B800E Service Manual Page 153

Electronic lockstitch button holer.
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6. ELECTRIC MECHANISM
<2-step power supply circuit board>
P1 [POWER]
Pin No.
1
+55V (PM)
2
+55V (PM)
3
P0V
4
P0V
5
+24V
6
0V
7
M55V (Cutter)
8
M55V (Cutter)
9
MP0V
10
MP0V
P3 [PER]
Pin No.
1
Relay input signal
2
0V
3
+55V relay output signal
4
+55V OFF signal
5
0V
P4 [ACIN]
Pin No.
1
ACIN
2
ACIN
3
-
4
EARTH
6 - 20
Signal name
Signal name
Signal name
Symptoms resulting mainly from poor contact
The feed home position and presser foot home position can
not be found.
The feed mechanism and presser foot mechanism do not
operate.
One of error E-06 and E-07 is displayed.
The cutter does not operate.
Error E-08 is displayed.
Symptoms resulting mainly from poor contact
The zigzag home position, feed home position and presser
foot home position can not be found.
The zigzag mechanism, feed mechanism and presser foot
mechanism do not operate.
One of error E-05, E-06 and E-07 is displayed.
+55 V (power supply for driving the feed mechanism and
work clamp PM) control is not possible
Error E-44 is displayed.
Symptoms resulting mainly from poor contact
The feed home position and presser foot home position can
not be found.
The feed mechanism and presser foot mechanism do not
operate.
One of error E-06 and E-07 is displayed.
LH4-B800E

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