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[Mocrocomputer circuit
board block diagram]
1 SW circuit board
Start/stop SW
Reverse SW
Thread trimming SW
2 With/without bobbin thread sensor circuit board
3 Slide VR
4 Controller socket
5 Card lid SW circuit board
6 Light/shade VR circuit board
7 Needle thread breakage detecting circuit board
8 Presser lifting SW
9 Potentiometer
!0 Thread winding SW
!1 Buttonholing stop SW Buttonholing start SW
!2 Used at the time of production
!3 Remaining amount sensor circuit board
(emitting light)
Bobbin thread remaining amount sensor
Limit sensor
7
1
3
2
@0
3
3
2
4
CN24
13
CN1
2
5
3
7
6
CN29
3
7
CN16
Microcomputer circuit board
8
CN5
2
CN2
3
CN11
9
2
CN3
3
CN13
4
CN31
!0
3
CN32
3
CN34
6
CN20
CN7
CN6
CN33
!1
4
4
3
!5
!6
!2
!7
!3
!4
!8
!4 Remaining amount sensor circuit board
(receiving light)
Bobbin thread remaining amount sensor
Limit sensor
!5 Feed STM
!6 Needle throw STM
!7 Disengagement detecting circuit board
!8 Main shaft detecting circuit board
Up/down stop
Needle throw, feed timing
Needle threading timing
Bobbin thread winding timing
Lateral feed timing
!9 Display circuit board
LCD 320 x 240 dots
@0 Touch panel
@1 Lateral feed STM
@2 Threading STM
@3 Transfer body detecting circuit board
#0
CN101
!9
@4
2
CN102
@5
4
15
48
5
5
6
CN14
CN22 CN27 CN28
CN35
5
CN30
3
CN4
2
CN12
26
CN21
10
CN25
10
CN26
2
CN36
9
CN23
CN19
CN9
CN8 CN18
4
7
5
4
4
@1
@6
@7
@2
@8
@9
@3
@4 CFL (backlighting)
Cold cathode valve
@5 ROM adaptor circuit board
@6 Bobbin thread supply STM
@7 Drawing STM
@8 Bobbin thread origin sensor circuit board
@9 Thread retaining plate cover sensor circuit board
#0 Inverter circuit board
Power for backlighting (CFL)
#1 Memory card
#2 DF sensor circuit boad
#3 Serial communication connector
#4 Power circuit board
#5 Sewing machine lamp
#6 Power SW
#7 Filter circuit board
#8 Power transformer (asm.)
#9 Motor pulse detecting circuit board
$0 Main motor
#5
#5
AC13.5V
2
1
#6
2
CN61
CN64
1
+24V,+28V
4
#4
CN66
1
#7
+5V
2
TE2
CN67
5
TE1
CN65
1
CN51
CN62
CN63
2
6
2
#8
AC28V,AC24V,
AC12V
$0
#9
$1
#1
CN71
#2
CN76
$2
#3
2
2
CN77
$3
2
2
CN79
$4
2
2
CN78
$5
4
4
$1 Thermistor
$2 Embridering device detecting SW
$3 Y origin detecting SW
$4 X origin detecting SW
$5 Frame SW 1 Frame SW 2 Frame SW 3
$6 Embroidering device
$7 Embroidery Y STM
$8 Embroidery X STM
$9 Eject lever detecting SW
CN50
AC120V
2
or
AC230V
CN75
$6 8
CN73
$7
4
CN74
$8
4
CN72
$9
2
2
50
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