SWF MAN-12 User Manual

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Page #68 background image

68

Short upper

thread after

trimming due to

separation failure

Thread break

before trimming

① Movable blade is too fast or

too slow to separate the

upper thread

② Incorrect position of picker

③ Picker failure

① Upper thread is too short

• check main and sub

tension adjuster

• dent or damage of

movable blade

② Lower thread is too short

• doesn t unwind smoothly

• too weak or too elastic

■ Adjust insert angle of

movable blade (295 )

■ Adjust picker position

■ Check and change X, Y

drivers

■ Adjust upper thread tension

■ remove dent using

whetstone or sandpaper or

change movable blade

■ adjust or change bobbin

case spring

■ change lower thread

■ Check fuse spec.

■ Too short lower

thread cannot make

stitches right after

trimming

Inspection & Repair CauseError Type Reference

Check for dent

Table of Contents

Questions and Answers:

R
randall23Aug 19, 2025
Why does the thread keep breaking on my SWF MAN-12 Sewing Machine?
- A
  Ashley OlsenAug 19, 2025
  If your SWF Sewing Machine experiences thread breaks, the issue might stem from several causes. The stitch may be too small or dense for the thread, requiring you to re-punch the design. Frequent breaks in the same spot suggest a need to re-punch after checking the design. An inadequate needle size for the thread calls for a needle change suitable for the thread type. A damaged needle (bent, dented, or worn) also necessitates a needle change. Incorrect needle installation (height, direction, etc.) requires re-installation. Lastly, a dirty needle (adhesive, etc.) suggests cleaning or changing both the needle and hook.
M
mgomezAug 23, 2025
Why is the stitch quality bad on my SWF MAN-12?
- K
  Krystal RogersAug 25, 2025
  If your SWF Sewing Machine is producing bad stitch quality, it could be due to several factors. The tape data might be bad, requiring correction. The tension on the X-Y belt may be inadequate, so you should adjust the tension. There might be foreign substances in the X-Y rail, so you should clean them. The X/Y drivers might have failed, so you should replace them. Finally, a heavy load on the frame could be the cause, so try reducing the speed of main shaft rotation.
S
Stacey ClarkeAug 26, 2025
How to fix poor stitch tension on my SWF MAN-12 Sewing Machine?
- N
  Nicole JonesAug 26, 2025
  If your SWF Sewing Machine is experiencing poor stitch tension, it could be due to several reasons: Weak upper thread tension, which requires adjustment. Uneven upper thread tension due to foreign substances, necessitating cleaning of the main and sub tension adjusters in the thread tension adjusting plate. Weak lower thread tension, which requires adjustment. Uneven lower thread tension, so clean the bobbin case and check tension on the bobbin spring. The thread thickness might be the cause, so change to a quality thread. Poor timing of needle and hook, requiring adjustment. Insufficient oil in hook, so oil the raceway of hook.

SWF MAN-12 Specifications

General

Brand	SWF
Model	MAN-12
Category	Sewing Machine
Language	English

Summary

Safety Rules

Safety Indications

Defines hazard symbols: DANGER, WARNING, and CAUTION.

Machine Delivery

Provides instructions for safe machine transport and handling.

Machine Installation

Specifies environmental and physical installation requirements.

Machine Operation

Outlines critical safety practices during machine operation.

Machine Installation and Precautions

Installation Condition

Specifies environmental requirements like temperature and humidity.

Electricity Installation Environment

Details electrical supply requirements and safety precautions.

Leveling the Machine

Machine Use and Precautions

Types of Safety Labels

Locations of Safety Labels

Names of Machine Parts

Basic Functions for Machine Operation

Basic Operation

Upper Threading and Tension Adjustment

Lower Threading and Tension Adjustment

Needle-Hook Timing and Related Tips

Covers needle selection, relation to thread, and timing.

Maintenance and Inspection

Check Points for Regular Inspection

Oil Supply

Adjusting Major Parts of the Machine

Trimmer Adjustment

Relationship Between Presser Foot and Needle

Adjusting Encoder

Adjusting Tension of Each Drive Belt

Troubleshooting

Causes and Troubleshooting

Lists common operational errors and their potential causes and solutions.

Error Display and Troubleshooting

Details specific error codes and corresponding troubleshooting steps.

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