Brother BAS-311G 142, Problem Cause Remedy Reference Upper thread breaks, Lower thread breaks

Page 149

10. TROUBLESHOOTING

Problem

 

 

Cause

 

 

 

Remedy

 

 

Reference

 

 

 

 

 

 

 

 

 

 

 

 

 

Upper thread breaks.

Upper thread tension is too strong.

 

Adjust the upper thread tension.

 

 

P. 89

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Needle is incorrectly installed.

 

 

Install the needle correctly.

 

 

Instruction

 

 

 

 

 

manual

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Thread is too thick for the needle.

 

Select a thread that matches the needle.

P. 89

 

 

 

 

 

 

 

 

 

 

 

Thread

take-up

spring

tension

and

Adjust the tension and height

of

the

P. 90

 

height are incorrect.

 

 

 

 

thread take-up spring.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Damage or burring of the rotary hook,

Repair or replace the problem part.

 

 

 

needle hole plate or needle.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Thread

breaking

from

heat

(Synthetic

Use a cooling tank.

 

 

Instruction

 

thread)

 

 

 

 

 

 

 

 

 

manual

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Thread is threaded incorrectly.

 

Thread the thread correctly.

 

 

Instruction

 

 

 

 

manual

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Lower thread breaks.

Lower thread tension is too strong.

 

Adjust the lower thread tension.

 

 

P. 89

 

 

 

 

 

 

 

 

 

 

 

Damage to corners of needle hole plate

Repair or replace the problem part.

 

 

 

or bobbin case.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Skipped stitches occur.

Clearance between needle

and rotary

Adjust the needle clearance.

 

 

P. 92

 

hook tip is too great.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Needle

and

rotary

hook

timing

is

Adjust the needle bar lift amount.

 

 

P. 91

 

incorrect.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The driver is covering the needle more

Adjust the driver needle guard.

 

 

P. 91

 

than necessary.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Needle is bent.

 

 

 

 

 

 

Replace the needle.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Needle is incorrectly installed.

 

 

Install the needle correctly.

 

 

Instruction

 

 

 

 

 

manual

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Needle is broken.

 

 

 

 

 

 

 

 

Adjust the needle clearance.

 

 

P. 92

 

Clearance between needle and rotary

 

 

 

 

 

 

 

 

hook tip is too great.

 

 

 

 

Adjust the needle bar lift amount.

 

 

P. 91

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Needle is bent.

 

 

 

 

 

 

Replace the needle.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Select a needle that is suitable for the

 

 

Needle deflection

 

 

 

 

 

sewing conditions.

 

 

P. 89

 

 

 

 

 

 

 

 

 

Reduce the sewing speed.

 

 

 

 

Needle is too thin.

 

 

 

 

 

Select a needle that is suitable for the

P. 89

 

 

 

 

 

 

sewing conditions.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Thread jamming.

Thread

take-up

spring

tension

and

Adjust the tension and height

of

the

P. 90

 

height are incorrect.

 

 

 

 

thread take-up spring.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Needle

and

rotary

hook

timing

is

Adjust the needle bar lift amount.

 

 

P. 91

 

incorrect.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Shuttle

race

thread

 

guide is

not

Adjust the position of the shuttle race

P. 92

 

separating the threads.

 

 

 

 

thread guide.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

142

BAS-311G, BAS-326G

Page 148 Page 150
Image 149
Page 148 Page 150
Contents BAS-311G BAS-326G Safety Instructions Environmental requirements Iii Sewing5222Q 4905Q Contents Table of Error Codes Specifications List of special functions when power is turned on Function SettingsList of advanced functions When Speed indicator is illuminatedMemory switches that have been changed from Memory switch setting method AdvancedDefault settings Ending setting modeOFF List of memory switch settingsFor solenoid specifications 1 pedal Work clamp settingsFor pneumatic specifications 2 pedal For solenoid specifications051 Sewing machine motor settings Feed settings User program settings Operation panel settingsDevice settings Data editing settings554 Thread breakage detector Specifications and destination settings Error processing settingsMaintenance settings Unique machine settings Setting the work clamp modeSolenoid specifications, single pedal standard operations Solenoid specifications, single pedal sequence operationPneumatic specifications, 2 pedal sequence operation Pneumatic specifications, 2 pedal standard operationsStitch counter checking method Clearing the cumulative number of stitchesError history checking method Input check list Input checking methodSele On / oFF Option input IN10 Output checking method CUt Software version checking method Handling data Reading / Writing Data\ISMS0102.SEW Structure of a CF card folderRead/write mode list Data read/write modeTurn on the power switch Switch to data read/write mode Reading sewing data from CF cards When memory switch No is onEnd data read/write mode Writing sewing data to CF cards Select the w 2 data read/write modeWriting memory switch data to CF cards Reading memory switch data from CF cardsWriting user program data to CF cards Reading user program data from CF cardsUpdating the control program Insert the floppy disk into the floppy disk drive Writing error log data to CF cardReading sewing data from floppy disks Writing sewing data to floppy disks Reading extended option output data from a CF card Reading extended option output data from floppy disks Writing extended option output data to CF cardsLower shaft and shuttle race mechanisms Needle bar and thread take-up mechanismsWork clamp lifter mechanism Solenoid specifications Intermittent presser foot lifter mechanism Work clamp lifter mechanism Pneumatic specificationsIntermittent presser foot stroke mechanism Direction Feed mechanismThread trimmer mechanism Thread wiper mechanism Tension release mechanismCovers Disassembly5090Q Work clamp arm mechanism Pneumatic specificationsPresser bar Pull downward from presser bar clamp Needle bar mechanism Upper shaft mechanism Lower shaft mechanism Feed covers 5103Q 5104Q 5106Q 5107Q 5118Q Work clamp lifter link Pull backward 5109Q Tension bracket assy Thread trimmer collar Shuttle hook mechanism Assembly Apply grease Stepping clamp lifter rod adjustment Index mark Work clamp lifter plate assy 5164Q 5168Q 5170Q 5171Q 5173Q Flat screws 8 pcs 5178Q Install so that the backlash is 0.01 GT belt tension adjustment 5184Q Right Y-LM guide installation Inside X-LM guide installationFeed bracket Needle plate 5140Q 4644Q Inside hole Inside hole Cut section 5195Q 5198Q 5199Q 5144Q Mating mark Movable knife 5201Q 5200Q Work clamp height adjustment Solenoid specifications Retainer adjustmentWork clamp height adjustment Pneumatic specifications Work clamp adjustment5153Q Shuttle race cover assy Motor cover L Checking the machine head switch AdjustmentStandard thread tension Thread take-up spring tension Thread take-up spring heightAdjusting the driver needle guard Adjusting the needle bar heightAdjusting the needle bar lift amount Rotary hook lubrication amount Adjusting the needle clearanceAdjusting the shuttle race thread guide Adjusting the position of the movable knife 4950Q 5237Q 5238Q Replacing the movable and fixed knives End feed plate installation mode Installing the feed platePresser foot installation position Adjusting the thread wiperChanging the intermittent stroke Changing the installation position of stepping clamp link aStepping clamp connecting rod position adjustment Adjusting the air pressure pneumatic specifications Adjusting the work clamp lift amountSolenoid specifications Pneumatic specificationsBelt tension adjustment Adjusting the thread trimmer cam position101 GT belt102 Adjusting the tension release amountAdjustment Y-GT belt 103 Adjusting the backlash of the lower shaft gear104 Adjusting the home position105 Y feed home position106 107 Adjusting the needle up stop home position108 Adjusting the needle up stop positionAdjustment method 109 110 Precautions while carrying out adjustmentsElectric shocks Injury111 Inside the control box and operation panel structure112 Description of fuses113 Description of connectorsElectrical Mechanism PMD P.C. board 114115 Work clamp mechanism 116Feed mechanism Sewing operations 117Thread trimming mechanism Other 118119 TroubleshootingDescription of symbols 120 121 122 123 Before carrying out adjustmentFig. C OK if there is Continuity between 124Panel 125CN2 Main 126127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 Problem Cause Remedy Reference Upper thread breaksLower thread breaks Needle is broken143 144 Segment DisplayI5060885B
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BAS-311G specifications

The Brother BAS-311G is a state-of-the-art industrial sewing machine designed specifically for advanced garment manufacturing. This high-speed, fully automated model is engineered to meet the demands of modern production environments, offering exceptional performance and versatility.

One of the key features of the BAS-311G is its automatic thread trimmer, which significantly reduces downtime and enhances productivity. This machine is capable of cutting the thread at the end of each seam, ensuring a clean finish and minimizing the need for manual intervention. This feature is especially beneficial in high-volume production settings where efficiency is paramount.

The BAS-311G also boasts an advanced automatic needle positioning system, allowing users to set the needle to stop in the up or down position. This functionality enhances control over the sewing process, making it easier to pivot and maneuver fabric, which is crucial for intricate designs and patterns. This precision is a boon for manufacturers looking to improve the quality of their finished products.

Another notable aspect of the BAS-311G is its versatility. The machine is equipped with an adjustable stitch length feature, enabling users to customize stitches according to specific project needs. This flexibility allows for the production of a wide range of garments, from delicate fabrics to thicker materials, making it suitable for various industries including fashion, sportswear, and workwear.

In terms of technology, the BAS-311G incorporates Brother's pioneering technology that ensures smooth and reliable operation. The machine includes a digital control panel, which simplifies the selection of stitch patterns and settings. Users can easily navigate through options, making adjustments on the fly, which is crucial in a fast-paced production environment.

Built with durability in mind, the BAS-311G is engineered for heavy-duty use with high-quality materials that withstand the rigors of daily operation. Its robust construction ensures longevity and sustained performance, making it a wise investment for businesses seeking reliable machinery.

In summary, the Brother BAS-311G is an excellent choice for manufacturers looking to enhance their sewing operations. With features such as automatic thread trimming, adjustable stitch lengths, and advanced technology integration, it stands out as a top-tier industrial sewing machine designed to improve efficiency and quality in garment production.
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