SunStar KM-350 Series User Manual (English)

Questions and Answers:

M
Melissa DelacruzAug 8, 2025
What to do if the needle breaks on a SunStar KM-350?
- S
  Shawn AllenAug 8, 2025
  If the needle breaks on your SunStar Sewing Machine, consider these potential causes and solutions: - Check if the needle is inserted correctly. If not, reinsert it correctly. - Inspect the needle for any bending. If bent, replace it with a new one. - The feed dog timing could be misaligned; in that case, adjust the timing of the feed dog. - The needle and hook timing might be off; adjust the timing of the needle and hook.
D
Diana BurnsAug 18, 2025
How to fix a SunStar KM-350 Sewing Machine when the needle breaks?
- S
  Sherri WilliamsAug 18, 2025
  To fix a SunStar Sewing Machine when the needle breaks, consider these potential causes and their solutions: - Check the needle's insertion: reinsert the needle correctly if it's in the wrong position. - Examine the needle for bending: change the needle if it's bent. - Evaluate the feed dog timing: adjust the timing of the feed dog if it's bad. - Assess the needle and hook timing: adjust the timing of the needle and hook if it's bad.
J
Joy RomeroAug 27, 2025
Why does the needle keep breaking on my SunStar KM-350?
- Y
  ycuevasAug 27, 2025
  A needle may break due to several reasons: - The needle might be inserted incorrectly; ensure it's reinserted correctly. - The needle could be bent, in which case you should change the needle. - The timing of the feed dog may be off; adjust the timing of the feed dog. - The timing between the needle and hook could be incorrect; adjust the timing of the needle and hook.

SunStar KM-350 Series Specifications

General

Max Stitch Length	4mm
Max Stitch Width	5mm
Free Arm	Yes
Stitch Type	Decorative
Buttonhole Styles	4-step
Needle Threader	Yes
Presser Feet	Buttonhole, Zipper, Button
Included Accessories	Bobbins, Needles, Screwdriver, Seam ripper
Application	General Purpose

Summary

Safety Rules and Marks

Understanding Safety Symbols

Explanation of danger, warning, and caution symbols.

Understanding Cautionary Marks

Explanation of 'must-not' and 'must' for safety marks.

Machine Safety Guidelines

Safe Machine Mobilization

Safety procedures for moving the sewing machine.

Machine Installation Safety

Precautions for safe machine installation.

Troubleshooting and Repair Safety

Safety measures for repair and troubleshooting.

Machine Operation and Safety Devices

Safe Machine Operation Practices

Instructions for safe operation of the sewing machine.

Identification of Safety Devices

Overview of key safety devices on the machine.

Caution Mark Locations and Content

Caution Mark Placement

Location of caution marks on the machine.

Understanding Caution Statements

Explanations of specific caution statements.

Machine Specifications Overview

Automatic Trimmer Specifications

Details for KM-250, KM-350, KM-506, KM-530 series trimmers.

Servo Motor Specifications

Electrical specifications for servo motors.

Motor and Automation Device Specifications

470 Motor and Controller Specs

Specifications for 470 motor and its controller.

Optional Automation Devices

Features and models of optional automation devices.

Machine Installation Procedures Part 1

Machine Head Installation

Steps for installing the sewing machine head.

Chip Discharge Plate Installation

Guidelines for installing the chip discharge plate.

Machine Installation Procedures Part 2

Knee-Lifting Solenoid Setup

Installing the resistance box for the solenoid.

Lubrication System Setup

Installing the magnetic chip remover for lubrication.

Machine Installation Procedures Part 3

Belt Tension Adjustment

How to adjust the belt tension.

Program Unit Installation

Installing the automatic knee-lifting solenoid unit.

Machine Installation Procedures Part 4

Belt Cover Installation

Attaching the belt cover for safety.

Location Detector Assembly and Adjustment

Location Detector Assembly

Assembling and installing the location detector.

Location Detector Adjustment

Adjusting the location detector for stop positions.

Stop Position and Back Tack Button

Stop Position Verification

Checking the machine's stop position accuracy.

Back Tack Button Functionality

Understanding and using the back tack button.

Sewing Machine Control and Adjustment Part 1

Needle Insertion Procedure

How to correctly insert a needle.

Needle Bar Adjustment

Adjusting the needle bar position.

Needle and Hook Timing

Adjusting the timing between needle and hook.

Thread Take-Up Lever Lubrication

Adjusting oil flow to the take-up lever.

Sewing Machine Control and Adjustment Part 2

Hook Lubrication Adjustment

Checking and adjusting oil supply to the hook.

Sewing Machine Control and Adjustment Part 3

Lower Thread and Tension Setup

Inserting bobbin and adjusting lower thread tension.

Upper Thread Routing

Steps for routing the upper thread.

Sewing Machine Control and Adjustment Part 4

Upper Thread Tension Adjustment

Adjusting main, take-up lever, and auxiliary thread tension.

Sewing Machine Control and Adjustment Part 5

Presser Foot Height and Tension

Adjusting presser foot height and tension.

Automatic Knee-Lifter Adjustment

Adjusting the lifting amount of the automatic knee-lifter.

Sewing Machine Control and Adjustment Part 6

Stitch Length Setting

How to set the stitch length.

Feed Dog Height and Inclination

Adjusting feed dog height and angle for material.

Sewing Machine Control and Adjustment Part 7

Feed Cam Adjustment

Adjusting feed cam for thread tension and material jam.

Needle Movement Adjustment

Adjusting needle movement relative to feed dog.

Sewing Machine Control and Adjustment Part 8

Trimmer Timing Adjustment

Adjusting the timing of the thread trimmer.

Sewing Machine Control and Adjustment Part 9

Fixed Blade Tension Adjustment

Adjusting the tension of the fixed blade.

Movable Knife Replacement

Steps for replacing the movable knife.

Fixed Blade Replacement

Steps for replacing the fixed blade.

Bobbin Catcher Adjustment

Adjusting the bobbin catcher operation.

Sewing Machine Control and Adjustment Part 10

Wiper Adjustment

Adjusting the wiper for proper operation.

Knife Adjustment Procedures

Adjusting Knife Height

How to adjust the height of the knife.

Adjusting Knife Front-Back Position

Adjusting the front-back position of the knife.

Chip Discharge and Cutting Width

Chip Discharge Guide Usage

Using chip discharge guide and auxiliary needle plate.

Changing Cutting Width Disassembly

Steps for disassembling to change cutting width.

Changing Cutting Width Assembly

Cutting Width Assembly Steps

Steps for assembling to change cutting width.

Sewing Machine Troubleshooting Part 1

Needle Breakage Troubleshooting

Common causes and solutions for needle breakage.

Thread Breakage Troubleshooting

Common causes and solutions for thread breakage.

Stitch Skip Troubleshooting

Common causes and solutions for stitch skipping.

Sewing Machine Troubleshooting Part 2

Upper Thread Issues Troubleshooting

Troubleshooting upper thread not sinking or pulling out.

Lower Thread Issues Troubleshooting

Troubleshooting lower thread not sinking.

Trimming Errors Troubleshooting

Causes and solutions for trimming errors.

Related product manuals

SunStar KM-380

15 pages

SunStar KM-380B