JUKI SC-120 User Manual

aJUKI
SC-20 SC-120
SC-220 SC-320
ENGINEER'S MANUAL
SC-20
SC-320
No. 1-35-3
1990.7
From the library of: Superior Sewing Machine & Supply LLC

JUKI SC-120 Specifications

General

Brand	JUKI
Model	SC-120
Category	Sewing Machine
Language	English

Summary

3. ADJUSTMENT

3-1. Belt Tension

Guidance on adjusting belt tension to prevent damage and ensure proper operation.

3-3. Checking and Correcting the Rotational Direction of Sewing Machine

3-4. Pedal

Details on adjusting pedal pressure and stroke for optimal control.

3-5. Maximum sewing speed

Instructions for adjusting the machine's maximum sewing speed settings.

4. FUNCTIONS

4-2. Functions selection switches

Details the use of DIP switches for configuring various machine functions.

Test program selection

Guide to selecting and using diagnostic test programs for machine checks.

Solenoid Timing Correction for Reverse Stitching

4-3. Increase of control panel functions

4-4. Safety circuit

Explains the purpose and operation of various machine safety circuits.

4-6. Production control system and needle-up stop switch functions

5. MAINTENANCE AND INSPECTION

5-1. How to replace the sensor potentiometer set

Step-by-step instructions for replacing the pedal sensor potentiometer.

5-5. How to replace each circuit board

Guides for replacing main, speed limiting, and transistor circuit boards.

5-6. Troubleshooting

General troubleshooting steps and a flowchart for diagnosing common issues.

5-7. Circuit board installment diagrams

5-8. Connector connection diagrams

5-10. Block diagrams