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JUKI
Sewing Machine
SC-120
JUKI SC-120 User Manual
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o
)
Operation
Trouble
What
to
check
Repair
C)
Thread
trimmer
is
actuated
when
it
should
not.
@
Touch
back
mechanism
functions
normally,
however,
automatic
reverse
feed
stitching
is
not
actuated.
Yes
(T)
Is
the
spring
pressure
of
the
pedal
sensor
applied
to
the
pedal
when
the
back
part
of
the
pedal
is
depressed
adequate?
Yes
@
Is
stroke
adjustment
potentiometer
adjusted
correctly?
Yes
No
No
No
Replace
PSC
box.
Synchronizer
up/down
detection
failure
has
been
detected,
causing
safety
circuitry
to
operate.
Replace
synchronizer.
Increase
spring
stiffness.
Adjust
VR7
(TSW).
Replace
PSC
box.
From the library of: Superior Sewing Machine & Supply LLC
72
74
Table of Contents
Operational Precautions
2
Table of Contents
3
Features
4
General
4
Operation
6
Name Ofpart
6
Product View and Parts List
6
Operation When the Power Switch Is Turned on
8
Pedal Operation
8
Test Run
8
Power Indicator Box
9
Power Indicator LED
9
How to Use the Automatic Reverse Stitching Patterns
10
SC-120 Control Panel
10
How to Use each Stitching Pattern
12
Pattern
13
To Set Number of Stitches N for Starting and Ending Automatic Reverse
13
How to Increase the Number of Steps for Pattern
14
SC-320 Control Panel
15
Reverse Stitching Pattern
16
Checking and Changing the Programmed Stitching Pattern
17
Overlapping Stitch Pattern
17
Programmed Stitching Pattern
17
How to Release the Thread Trimming Switch
18
How to Set the Desired Machine Stop Mode
18
Adding Steps to the Programmed Stitching Pattern 1
19
Inserting or Deleting a Stitching Pattern
21
Step Insertion Switch
21
Step Deletion Switch
22
How to Operate the Restart Switch
23
Adjustment
24
Belt Tension
24
Prevention Motor Vibration (for N Company's Motor)
24
Checking and Correcting the Rotational Direction of Sewing Machine
24
Pedal
25
Adjusting the Pedaling Pressure
25
Adjusting the Pedal Stoke
25
Pedal Adjusting VR and Its Functin in Detail
27
Adjusting the Pedal Stroke
27
Maximum Sewing Speed
28
Adjusting the Low Speed
28
Adjusting the Acceleration Point
28
400 S.p.M.-Step Speed Control Knob
29
Max. Sewing Speed Control Knob
29
Auto-Lifter
30
Adjusting the Height of the Lifter
30
How to Reduce the Hand Light from Flickering (for Single Phase Only)
31
Functions
32
Power Supply Voltage
32
Functions Selection Switches
33
Detailed Explanations of Functions
35
Wiper Control Selection
35
Selection of Back-Up Needliпe Raising after Thread Trimmin
35
Selection of Soft Start Function
35
Selection of Manual Countback Control Function
36
Selection of Automatic Presser Foot Lifting Function
37
Test Program Selection
38
Speed Test Program
38
Switch Input Test Program
40
Reverse Stitching Solenoid Timing Correction
43
Synchro Test Program
43
Automatic Start Reverse Stitching Solenoid on Timing Correction
43
Automatic Start Reverse Stitching Solenoid off Timing Correction
45
Automatic Terminal Reverse Stitching Solenoid off Timing Correction
46
Increase of Control Panel Functions
47
How to Remove the Control Box
48
Safety Circuit
49
Control Box Mounting
49
Synchronizer Malfunction Safety Circuit
50
Thread Trimming in Progress/Completed Safety Circuit
50
Connectors for Standing Work
51
If Power Is Turned on While Pedal Is Depressed
51
Auto-Lifter Safety Circuit
51
Needle Position Detector Loose Connector Safety Circuit
51
Production Control System and Needle-Up Stop Switch Functions
53
Upper Stop Switch
53
Maintenance and Inspection
54
How to Replace the Sensor Potentiometer Set
54
Motor Malfunction Detector LED
56
Memory Battery Charging Monitor LED(SC-320 Only)
56
Solenoid Monitor LED
57
How to Replace each Circuit Board
58
Precautions in Inserting and Removing Connectors
66
Troubleshooting
67
Power Lamp Fails to Light
68
Needle Fails to Stop in up Position
69
Sewing Machine Won't Stop
70
Stops Outside the Normal Upper Stop Interval
70
Sewing Machine Fails to Operate
71
Fails to Reach High Speed
71
Needle Fails to Stop in down Position
72
Operation at Low Speed Fails to Stop
72
Stop at Position Other than the down Position
72
Thread Trimmer Is Actuated When It Should Not
73
Thread Is Not Trimmed
74
Sewing Machine Fails to Stop in up Position
74
Continues to Run at Low Speed Without Stopping
74
Wiper Fails to Operate
75
Presser Foot Fails to Rise
75
Fails to Perform Reverse Feed Stitching
76
Automatic Reverse Feed Stitching Fails
76
One-Touch Type-Reverse Feed Does Not Operate
76
Reverse Feed Continues Without Stopping
77
Automatic Reverse Feed Fails but One-Touch Type Reverse Feed Operates
77
Circuit Board Installment Diagrams
78
Circuit Boards View
79
Connector Connection Diagrams
83
Type of Rating Plates for SC Series of the PSC Unit
84
Block Diagrams
85
4
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JUKI SC-120 Specifications
General
Brand
JUKI
Model
SC-120
Category
Sewing Machine
Language
English
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