Brother LK3-B448E instruction manual 40,46

Page 76

18. Troubleshooting

Problem

Upper thread breaks.

Lower thread breaks.

Skipped stitches occur.

Needle breaks.

Cause

Upper thread tension is too strong.

Needle is installed incorrectly.

Thread is too thick for the needle.

Thread takeup spring tension and height are incorrect.

Damaged or burred rotary hook, needle hole plate or needle

Lower thread tension is too strong.

Corners of needle hole plate or bobbin case are damaged.

Clearance between needle and rotary hook tip is too great.

Incorrect needle and rotary hook timing

Driver is contacting needle more than is necessary.

Needle is bent.

Needle is installed incorrectly.

Needle is striking the button.

Needle is touching the rotary hook.

Needle is bent.

Wayward stitches

Needle is too thin.

Check

Upper thread tension

Needle direction

Thread and needle

Thread takeup spring tension and height

Damage or burring

Lower thread tension

Damage

Needle clearance

Needle bar lift amount

Clearance between driver and needle

Bent needle

Needle direction

Needle down setting

Needle clearance

Needle bar lift amount.

Bent needle

Needle and feed timing

Needle and thread

 

Remedy

Page

 

 

 

 

 

 

 

Adjust the upper thread

27

 

tension.

 

 

 

 

 

 

 

 

 

Install the needle so

27

 

that the groove is facing

 

 

forward.

 

 

 

 

 

Use the correct thread

27

 

for the needle.

 

 

 

 

 

 

 

 

 

Adjust the tension and

29

 

height of the thread

 

 

takeup spring.

 

 

 

 

 

File smooth or replace

 

 

the affected part.

 

 

 

 

 

 

 

 

Adjust the lower thread

28

 

tension.

 

 

 

 

 

 

 

 

 

File smooth or replace

 

 

the affected part.

 

 

 

 

 

 

 

 

Adjust the needle

42

 

clearance.

 

 

 

 

 

 

 

 

 

Adjust the needle bar lift

41

 

amount.

 

 

 

 

 

 

 

 

 

Adjust the driver needle

42

 

guard.

 

 

 

 

 

 

 

 

 

Replace the needle.

 

 

 

 

 

 

 

 

 

 

Install the needle so

27

 

that the groove is facing

 

 

forward.

 

 

 

 

 

Adjust so that the

 

 

needle drops down into

40,46

 

 

the hole of the button.

 

 

 

 

 

Adjust the needle

42

 

clearance.

 

 

 

 

 

 

 

 

 

Adjust the needle bar

41

 

lift amount.

 

 

 

 

 

 

 

 

 

Replace the needle.

 

 

 

 

 

 

 

 

 

 

Adjust the needle

52

 

down detection

 

position.

 

 

 

 

 

Use the correct needle

 

 

for the material.

 

 

 

 

LK3-B448E MARKII/BA-16

69

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Contents LK3-B448E Symbols IndicationsLightning may cause problems with correct operation Environmental requirementsSewing IiiLK3-B448E MARKII/BA-16 Contents Changing functions using the DIP switches Name of each part Name of each partSpecifications SpecificationsSpecifications NeedleProgram list Specifications Program No Optional parts Power table InstallationInstallation Installing the motor Installing the motor pulleyInstalling the control box Installing the oil pan Installing the cushionsInstalling the machine head Installing the head restInstalling the vibrating bowl Installing the liquid cooling tank, optionalInstalling the control box for vibrating bowl Installing the button feeder Installing the shooterConnecting the cords P11Installation Button feeder connection Control box for vibrating bowl connectionInstallation Power switch connection Installing the button feeder coverPower switch connector control box Installing the operation panel Connecting the ground wireInstalling the V-belt Installing the belt cover Installing the foot switchInstalling the motor cover Installing the spool stand Installing the eye guardAdjustment by the accessory spring Lubrication points LubricationLubrication Applying grease Draining the oilName and function of each operation panel item OperationOperation S E TY-SCALE Operating procedure Setting the program numberSetting the X-scale and Y-scale Setting the sewing speedOperating the button feeder Operating the vibrating bowlWhen checking by operating only the feed mechanism To ensure safety during useChecking the sewing pattern Checking the sewing patternInstalling the needle Correct useSelecting the needle and thread Threading the upper threadWinding the lower thread Thread tension reference guide Replacing the bobbin case and threading the threadLower thread tension Upper thread tension Adjusting arm thread guide R Thread take-up amountSewing SewingBefore starting sewing Maintenance and inspection Cleaning the rotary hookCleaning the control box air inlet port Maintenance and inspectionWipe the eye guard clean with a soft cloth Cleaning the eye guardChecking the needle Adjustments AdjustmentsTileing back the machine head Adjusting the needle bar height Adjusting the needle bar lift amountAdjusting the needle clearance Adjusting the driver needle guardAdjusting the shuttle race thread guide Adjusting the thread take-up amount Adjusting the movable knifeAdjustments Replacing the movable knife and fixed knife Adjusting the button clamp lift amount Adjusting the position of the button holder Adjusting the holding pressureAdjustment Adjusting the button clamp height Adjusting the needle up stop position Adjusting the thread wiperAdjusting the vibrating bowl If buttons are not fed properly, check the followingAdjustment for excess buttons in the button shooter Button replacement Button clamp adjustmentAdjusting the button carrier plate Adjustment Adjustment when the button thickness changesIf button hole arrangements differ Adjustment Adjusting the feeder position adjustment Adjustment Adjusting the needle location Horizontal feed positionButton hole gap Vertical feed positionReplacement the V-belt Sewing machine Belt Checking the input sensor and DIP switch input P1 P2 P3 P4Checking the input voltage Moving stitch patterns Using the counters Using the bobbin thread counterUsing the production counter Using the countersUsing user programs Using user programsRecording a user program P1 P2Using user programs Using a user program Clearing the user programsUsing the cycle sewing function Using the cycle sewing functionPress the P1 switch o Recording a cycle sewing programUsing the cycle sewing function Using a cycle sewing program Clearing a cycle sewing programChanging functions using the DIP switches Operation panel DIP switchesSetting the presser mode Changing functions using the DIP switchesDIP switches inside the control box Clearing all memory settings Changing special functions using the memory switchesMemory switches 00 0F P1 P2 P3 P4Memory switches 20 2F Memory switches 30 4FTable of error codes Table of error codesSegment LED alphabet Errors generated when optional equipment is connectedPanel display Text display LK3-B448E MARKII/BA-16 Troubleshooting Troubleshooting40,46 Needle drops into Hole of the button15-1, Naeshiro-cho, Mizuho-ku, Nagoya 467-8561, Japan. Phone

LK3-B448E specifications

The Brother LK3-B448E is a versatile and innovative sewing machine designed to meet the needs of both home sewers and professionals alike. This comprehensive machine is especially advantageous for users who want to experiment with intricate designs and achieve high-quality results with ease.

At the core of the LK3-B448E lies its advanced computerized technology, which facilitates a seamless sewing experience. The machine features a user-friendly interface, making it accessible for not just experienced sewists but also beginners. The LCD display provides clear visibility of settings, stitch patterns, and design options, ensuring that users have full control over their projects.

One of the standout features of the LK3-B448E is its extensive library of built-in stitch patterns. With over 100 different stitches to choose from, including decorative, utility, and quilting stitches, users can easily customize their sewing to suit any project. In addition to the built-in stitches, this machine supports the use of embroidery patterns and designs, expanding creative possibilities significantly.

The LK3-B448E also incorporates advanced sewing technologies, such as automatic needle threading and a drop-in bobbin system. These features simplify the setup process, allowing users to spend more time sewing and less time managing technicalities. Furthermore, the machine offers adjustable stitch length and width, enabling personalized settings that cater to various fabric types and sewing tasks.

Another remarkable characteristic of the LK3-B448E is its adjustable presser foot pressure. This allows for better control, whether working with delicate fabrics or thicker materials. The machine’s speed controls help manage sewing speed, providing additional comfort for users as they tackle intricate patterns or detailed designs.

The LK3-B448E also supports USB connectivity, enabling users to transfer new designs and updates effortlessly. This feature ensures that the machine remains relevant with cutting-edge patterns and functionalities, extending its lifespan and usability.

In conclusion, the Brother LK3-B448E combines user-friendly design with advanced technology, offering a comprehensive sewing experience. Its extensive features, coupled with customizable settings, make it an ideal choice for both novice and experienced users looking to enhance their sewing projects. With the LK3-B448E, creating beautiful garments and intricate designs is a straightforward and enjoyable process.
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