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JUKI Manuals
Sewing Machine
SC-20
Engineer's manual
JUKI SC-20 Engineer's Manual
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Table Of Contents
93
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93
Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Operational Precautions
Table of Contents
Features
General
Operation
Name Ofpart
Product View and Parts List
Operation When the Power Switch Is Turned on
Pedal Operation
Test Run
Power Indicator Box
Power Indicator LED
How to Use the Automatic Reverse Stitching Patterns
SC-120 Control Panel
How to Use each Stitching Pattern
Pattern
To Set Number of Stitches N for Starting and Ending Automatic Reverse
How to Increase the Number of Steps for Pattern
SC-320 Control Panel
Reverse Stitching Pattern
Checking and Changing the Programmed Stitching Pattern
Overlapping Stitch Pattern
Programmed Stitching Pattern
How to Release the Thread Trimming Switch
How to Set the Desired Machine Stop Mode
Adding Steps to the Programmed Stitching Pattern 1
Inserting or Deleting a Stitching Pattern
Step Insertion Switch
Step Deletion Switch
How to Operate the Restart Switch
Adjustment
Belt Tension
Prevention Motor Vibration (for N Company's Motor)
Checking and Correcting the Rotational Direction of Sewing Machine
Pedal
Adjusting the Pedaling Pressure
Adjusting the Pedal Stoke
Pedal Adjusting VR and Its Functin in Detail
Adjusting the Pedal Stroke
Maximum Sewing Speed
Adjusting the Low Speed
Adjusting the Acceleration Point
400 S.p.M.-Step Speed Control Knob
Max. Sewing Speed Control Knob
Auto-Lifter
Adjusting the Height of the Lifter
How to Reduce the Hand Light from Flickering (for Single Phase Only)
Functions
Power Supply Voltage
Functions Selection Switches
Detailed Explanations of Functions
Wiper Control Selection
Selection of Back-Up Needliпe Raising after Thread Trimmin
Selection of Soft Start Function
Selection of Manual Countback Control Function
Selection of Automatic Presser Foot Lifting Function
Test Program Selection
Speed Test Program
Switch Input Test Program
Reverse Stitching Solenoid Timing Correction
Synchro Test Program
Automatic Start Reverse Stitching Solenoid on Timing Correction
Automatic Start Reverse Stitching Solenoid off Timing Correction
Automatic Terminal Reverse Stitching Solenoid off Timing Correction
Increase of Control Panel Functions
How to Remove the Control Box
Safety Circuit
Control Box Mounting
Synchronizer Malfunction Safety Circuit
Thread Trimming in Progress/Completed Safety Circuit
Connectors for Standing Work
If Power Is Turned on While Pedal Is Depressed
Auto-Lifter Safety Circuit
Needle Position Detector Loose Connector Safety Circuit
Production Control System and Needle-Up Stop Switch Functions
Upper Stop Switch
Maintenance and Inspection
How to Replace the Sensor Potentiometer Set
Motor Malfunction Detector LED
Memory Battery Charging Monitor LED(SC-320 Only)
Solenoid Monitor LED
How to Replace each Circuit Board
Precautions in Inserting and Removing Connectors
Troubleshooting
Power Lamp Fails to Light
Needle Fails to Stop in up Position
Sewing Machine Won't Stop
Stops Outside the Normal Upper Stop Interval
Sewing Machine Fails to Operate
Fails to Reach High Speed
Needle Fails to Stop in down Position
Operation at Low Speed Fails to Stop
Stop at Position Other than the down Position
Thread Trimmer Is Actuated When It Should Not
Thread Is Not Trimmed
Sewing Machine Fails to Stop in up Position
Continues to Run at Low Speed Without Stopping
Wiper Fails to Operate
Presser Foot Fails to Rise
Fails to Perform Reverse Feed Stitching
Automatic Reverse Feed Stitching Fails
One-Touch Type-Reverse Feed Does Not Operate
Reverse Feed Continues Without Stopping
Automatic Reverse Feed Fails but One-Touch Type Reverse Feed Operates
Circuit Board Installment Diagrams
Circuit Boards View
Connector Connection Diagrams
Type of Rating Plates for SC Series of the PSC Unit
Block Diagrams
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1
Table of Contents
2
Features
3
General
4
Sc-120 Control Panel
5
Sc-320 Control Panel
6
Troubleshooting
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From the library of: Superior Sewing Machine & Supply LLC
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Summary of Contents for JUKI SC-20
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This manual is also suitable for:
Sc-120
Sc-220
Sc-320
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