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Sewing Machine
LBH-1790 Series
JUKI LBH-1790 Series User Manual
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(5) Power circuit diagram (Single phase 220 to 240V)
Green/
Yellow
Brown
Light blue
Power switch
Power source
Green/
Yellow
Brown
Light blue
FLT-S p.c.b. A (asm.)
Red
White
Black
Brown
White
Yellow
SDC p.c.b. A (asm.)
MAIN p.c.b. A (asm.)
Purple
Purple
Orenge
Orenge
Yellow
Brown
Red
Brack
Brack
Brack
Brack
Brack
Brack
Brack
CN1
CN2
CN3
CN17
CN13
CN11
CN31
CN15
CN32
1
2
3
4
5
6
FG
NC
NC
AC200 TO 240V
AC200 TO 240V
NC
1
2
3
1
2
3
280V
CENTER
AGND
1
2
3
1
2
3
280V
CENTER
AGND
1
2
3
4
5
1
2
3
4
5
FCANCEL
+12V
N.C
RL1
PDD
1
2
3
4
5
1
2
3
4
5
NC
+12V
NC
RL1 (N)
PDD (N)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
+85V/48V
+85V/48V
+33V
+33V
+24V
+12V
+5V
PGND
PGND
PGND1
PGND1
PGND1
GND
GND
+48V
+48V
+33V
+33V
+24V
+12V
+5V
GND
GND
GND
GND
GND
GND
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
+5V
+5V
AUDET (N)
ADDET (N)
LSW (N)
TSW (N)
PWF (N)
µ
RES (N)
RSW (N)
ASPC0
SP0 (N)
SP1 (N)
SP2 (N)
SP3 (N)
SP4 (N)
SP5 (N)
USW (N)
TRMD (N)
ERR (N)
PDET (N)
MA
MB
BRK (N)
SSTATE (N)
SDET (N)
DDET (N)
UDET (N)
TG1/45
SON (N)
NC
GND
GND
GND
GND
TXD
RXD
DSR
DTR
CTS
RTS
+5V
+5V
AUDET [N]
ADDET [N]
LSW [N]
TSW [N]
PWF [N]
µ
RES [N]
RSW [N]
ASPC
SP0 [N]
SP1 [N]
SP2 [N]
SP3 [N]
SP4 [N]
SP5 [N]
USW [N]
TRIM [N]
ERR [N]
PDET [N]
MA
MB
BRK [N]
S.STATE [N]
SDET [N]
DDET [N]
UDET [N]
TG1/45 [N]
SOFF [P]
NC
GND
GND
GND
GND
RXD
TXD
DTR
DSR
RTS
CTS
1
2
3
4
5
6
133
135
Table of Contents
Default Chapter
3
Table of Contents
3
Specifications
6
Standard Sewing Shape List
7
Standard Adjustment
8
Height of the Needle Bar
8
Needle-To-Hook Timing
8
Adjusting the Feed Timing Belt Tension
10
Knife Drop Position
10
Adjusting the Stroke and Initial Position of the Cloth Cutting Knife
12
Adjusting the Rotary Play of the Cloth Cutting Knife
14
Replacing the Knife
14
Adjusting the Needle Thread Trimmer
16
Adjusting the Thread Grasping Force of the Needle Thread Trimmer
16
Adjusting the Height of the Needle Thread Trimmer
16
Needle Thread Trimming Adjustment Mode
18
Adjusting the Needle Thread Trimmer Origin Sensor
20
Lateral Adjustment of the Needle Thread Trimmer (Start of Sewing)
20
Longitudinal and Lateral Adjustment of the Needle Thread Trimmer (at the Time of Trimming)
22
Opening Amount of the Needle Thread Trimmer
22
Adjusting the Needle Thread Draw-In Amount
24
Adjusting the Bobbin Thread Trimmer
24
Bobbin Thread Trimmer Adjustment Mode
24
Adjusting the Bobbin Thread Trimming Origin Sensor
26
Adjusting the Position of the Trimmer
26
Replacing the Bobbin Thread Trimmer
28
Open Timing and Open Amount
28
Adjusting the Presser Lifter
30
Adjusting the Backlash of the Presser Lifter Gear
30
Adjusting the Presser Bar Position Bracket
30
Adjusting the Presser Lifter Origin Sensor
32
Adjusting the Senor
32
Refer to the Adjusting Procedure of the Presser Lifter Motor Origin Compensation
32
Adjusting the Thread Tension
34
Adjusting the Stroke of the Thread Tension Solenoid
34
Adjusting the Thread Take-Up Spring Tension (Purl Stitching)
34
Adjusting the Bobbin Winder
36
Adjusting the Thread Breakage Detecting Plate
36
Adjusting the Bobbin Presser
38
Adjusting the Pedal
40
Adjusting each Sensor
42
Adjusting the Needle Rocking Origin
42
Needle Rocking Motor Origin Compensation
43
Adjusting the Feed Origin
44
Feed Motor Origin Compensation
45
Disassembling/Assembling Procedure
46
Disassembling/Assembling the Main Shaft
46
Replacing the Timing Belt (Main Shaft)
48
Replacing the Timing Belt (Hook Driving Shaft)
50
Adjusting the Timing Belt of Main Shaft (Idler)
52
Disassembling/Assembling the Face Plate Section
54
Disassembling/Assembling the Needle Rocking Motor
56
Replacing the Cloth Cutting Knife Solenoid
58
Replacing the Cloth Cutting Knife Solenoid Cushion
60
Replacing the Knife Return Stopper
62
Lubrication
64
Lubricating Oil to Oiling Tank
64
Adjusting the Lubrication for the Sewing Hook
64
Applying Grease
64
Main Shaft Components
64
Presser and Feed Components
65
Needle Bar Rocking Components
66
Needle Thread Trimmer Components
67
Cloth Cutting Knife Components
68
Operation Panel
70
Structure of the Operation Panel
70
Initial Value Data for each Shape Table
72
Various Data List
73
Sewing Data List
73
Memory Switch Data List
79
Explanation of Shape
83
Detailed Explanation of Continuous Stitching
91
Error Code List
92
Electrical Components
95
Change of Data ROM
95
Adaptation to the High Voltage
95
DIP Switch
95
Adaptation to the PK Pedal
96
Fuse List
97
Gauge Components and Optional Components
98
Others
100
Points of Replacement for Feed 70 MM and 120 MM
100
Troubles and Corrective Measures
102
With Regard to Sewing
102
With Regard to Mechanical Components
111
With Regard to Electrical Components
112
Time Chart
128
Circuit Diagram
130
Block Diagram a (3-Phase 200 to 240V)
130
Block Diagram B (Single Phase 230V (for CE))
131
Block Diagram C (Single Phase 220 to 240V)
132
Power Circuit Diagram (3-Phase 200 to 240V)
133
Power Circuit Diagram (Single Phase 220 to 240V)
134
Power Circuit Diagram (Single Phase 100V)
135
Servo Motor Circuit Diagram
136
Stepping Motor/Solenoid Circuit Diagram
137
Head Sensor Circuit Diagram
138
Pedal Switch Circuit Diagram
139
Connection Circuit Diagram between Control Box and Head
140
Drawing of the Table
141
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JUKI LBH-1790 Series Specifications
General
Brand
JUKI
Model
LBH-1790 Series
Category
Sewing Machine
Language
English
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