Brother sewing machine troubleshooting

Sewing machines of the make Brother are represented by plenty of models, and are divided into two main categories: computer and electromechanical ones. Each category includes models, which can satisfy requests of professionals and starters in the world of sewing and quilting. Below you will find information on troubleshooting of some of the most popular models of the make Brother

Brother KE-430B sewing machine troubleshooting

ProblemCauseRemedy
Work clamp does not rise. Button clamp does not rise. (438)<430. 431, 433. 434, 435, 436, 484> Work clamp operation is sluggish.Grease the sliding part of the work damp.
Work damp (Button clamp) lift amount is too great.Adjust the work clamp (button damp) lift amount.
Too much friction between work clamp plate and work damp arm lever plate. (430, 431, 433, 434 solenoid specifications)Grease the work damp plate and work clamp arm lever plate.
Work clamp is contacting thread wiper.Adjust the position of the thread wiper.
Work clamp is not lowered. Button clamp is not lowered. (438)Presser lifter link is not moving back.Check if the link return spring is unhooked.
Work clamp lift amount is incorrect. Button clamp lift amount is incorrect. (438) Incorrect position of work damp arm lever plate (button clamp holder hook assembly). Incorrect position of work damp arm lever.Adjust the work clamp (button damp) lift amount.
Work clamp does not close. (432)Incorrect position of presser closing roller.Check whether stop lever is engaged with stop position adjusting plate or not. and adjust the position of presser closing roller.
Thread wiper does not operate correctly.The thread wiper is obstructing the needle.Adjust the height of the thread wiper.
Adjust the operating distance of the thread wiper.
Thread wiper position is incorrect.Adjust the operating distance of the thread wiper.
Lower thread winds to one side.Tension stud height is incorrect.Adjust the height of the tension stud.
Lower thread winding amount is incorrectBobbin presser position is incorrect.Adjust the position of the bobbin presser.
Thread comes unthreaded.Stitches being skipped at the sewing start.Refer to “Skipped stitches occur"
Uneven needle thread.Adjust the sub-tension.
Needle thread is too short.Adjust the thread take-up lever stroke.
Upper thread breaks.Upper thread tension is too strong.Adjust the upper thread tension.
Needle is installed incorrectly.Install the needle correctly.
Thread is too thick for the needle.Use the correct thread for the needle.
Thread take-up spring tension and height are incorrect.Adjust the tension and height of the thread take-up spring.
Damaged or burred rotary hook, needle hole plate or needle.File smooth or replace the affected part.
Thread melting (synthetic thread)Use a thread cooling device (optional)
Lower thread breaks.Lower thread tension is too strong.Adjust the lower thread tension.
Comers of needle hole plate or bobbin case are damaged.File smooth or replace the affected part.
Skipped stitches occur.Clearance between needle and rotary hook tip is too great.Adjust the needle clearance.
Incorrect needle and rotary hook timing.Adjust the needle bar lift amount.
Driver is contacting needle more than is necessary, (except KE-484C)Adjust the driver needle guard.
Needle is bent.Replace the needle.
Needle is installed incorrectly.Install the needle correctly.
Needle thread is too short.Adjust the thread take-up lever stroke.
Needle breaks.Needle is touching the rotary hook.Adjust the needle clearance.
Adjust the needle bar lift amount.
Needle is bent.Replace the needle.
Needle is too thin.Use the correct needle for the material.
Needle is striking the button (438)Refer to '6. CHECKING THE SEWING PATTERN’ in the Instruction Manual.
Button breaks. (438)Needle is striking the buttonRefer to '6. CHECKING THE SEWING PATTERN’ in the Instruction Manual.
Upper thread is not trimmed.Movable knife is blunt.Replace the movable knife.
Fixed knife is blunt.Sharpen or replace the fixed knife.
Movable knife does not pick up the thread.Adjust the position of the shuttle race thread guide, (except KE-484C)
Adjust the needle bar lift amount.
The movable knife does not pick up the thread because of skipped stitches at the sewinq end.Refer to “Skipped stitches occur".
Movable knife position is incorrect.Adjust the position of the movable knife.
Sub-tension is too weak.Turn the sub-tension nut to adjust the tension.
Thread jamming.Thread take-up spring tension and height are incorrect.Adjust the tension and height of the thread take-up spring.
Incorrect needle and rotary hook timing.Adjust the needle bar lift amount.
Shuttle race thread guide is not separating the threads, (except KE-484C)Adjust the position of the shuttle race thread guide.
Poor seam finish on reverse side of material.Shuttle race thread guide is separating the threads insufficiently, (except KE-484C)Adjust the position of the shuttle race thread guide.
Upper thread is not properly tight.Adjust the upper thread tension.
Uneven needle thread.Adjust the sub-tension.
Needle thread is too long.Adjust the thread take-up lever stroke.
Needle is striking the button (438)Refer to “6. CHECKING THE SEWING PATTERN" in the Instruction Manual.
Incorrect thread tightness.Upper thread tension is too weak.Adjust the upper thread tension.
Lower thread tension is too weak.Adjust the lower thread tension.
Thread take-up spring tension and height are incorrect.Adjust the tension and height of the thread take-up spring.
Machine does not operate when power is turned on and foot switch is depressed.Head position switch does not work.Check if the head position switch cord is disconnected.
Adjust the position of the switching plate.
Replace the head position switch if it is broken.
Inner clamping device does not operate. (434, 435, 436)Work clamp pressure is too strong.Adjust the work clamp pressure so that the inner clamping device operates.

Brother XL-2600 sewing machine troubleshooting

SymptomPossible causeHow to put it right
The sewing machine does not work.The machine is not plugged in.Plug the machine in.
The main power switch is turned off.Turn on the main power switch.
The bobbin-winder shaft is pushed to the right.Move the bobbin-winder shaft to the left.
You have not used the foot controller properly.Use the foot controller properly.
The needle breaks.The needle is not fitted properly.Fit the needle properly.
The needle clamp screw is loose.Use a coin or screwdriver to firmly tighten the screw.
The needle is bent or blunt.Replace the needle.
You have not used the right combination of fabric, thread and needle.Choose a thread and needle that are appropriate for the type of fabric.
The presser foot you are using is not appropriate for the type of stitch that you want to sew.Attach the presser foot that is correct for the type of stitch that you want to sew.
The upper thread tension is too tight.Loosen the upper thread tension.
You are pulling the fabric too much.Lightly guide the fabric.
You have not fitted the spool properly.Fit the spool properly.
The area around the hole in the needle plate is scratched.Replace the needle plate. Contact your retailer or the nearest authorized service center.
The area around the hole in the presser foot is scratched.Replace the presser foot. Contact your retailer or the nearest authorized service center.
The bobbin case is scratched.Replace the bobbin case. Contact your retailer or the nearest authorized service center.
You have not used a bobbin that has been designed for this machine.Incorrect bobbins will not work properly. Only use a bobbin that has been designed for this machine.
The upper thread breaks.You have not threaded the upper thread properly. (For example, you nave not fitted the spool properly, or the thread has come out of tne guide above the needle.)Correct the upper threading.
There are knots or tangles in the thread.Remove any knots or tangles.
The needle is not appropriate for the thread you are using.Choose a needle that is appropriate for the type of stitch.
The upper-thread tension is too tight.Loosen the upper thread tension.
The thread is tangled.Remove the tangled thread. If the thread is tangled in the bobbin case, clean the bobbin case.
The needle is bent or blunt.Replace the needle.
You have not inserted the needle properly.Insert the needle properly.
The upper thread breaks.The area around the hole in the needle plate is scratched.Replace the needle plate. Contact your retailer or the nearest authorized service center.
The area around the hole in the presser foot is scratched.Replace the presser foot. Contact your retailer or the nearest authorized service center.
The bobbin case is scratched, or has a burr on it.Replace the bobbin case. Contact your retailer or the nearest authorized service center.
You have not used a bobbin that has been designed for this machine.Incorrect bobbins will not work properly. Only use a bobbin that has been designed for this machine.
The lower thread is tangled or breaks.You have not wound the bobbin thread properly.Wind the bobbin properly.
The bobbin is scratched or does not turn smoothly.Replace the bobbin.
The thread is tangled.Remove the tangled thread and clean the bobbin case.
You have not used a bobbin that has been designed for this machine.Incorrect bobbins will not work properly. Only use a bobbin that has been designed for this machine.
Bobbin is set incorrectly.Reset the bobbin thread correctly.
The thread tension is incorrect.You have not threaded the upper thread properly.Correct the upper threading.
You have not wound the bobbin thread properly.Wind the bobbin thread properly.
You have not threaded the right combination of thread and needle for the fabric you are using.Choose a thread and needle that are appropriate for the type of fabric.
You have not attached the presser foot holder properly.Attach the presser foot holder properly.
The thread tension is incorrect.Adjust the tension of the upper thread.
You have not used a bobbin that has been designed for this machine.Incorrect bobbins will not work properly. Only use a bobbin that has been designed for this machine.
Bobbin is set incorrectly.Reset the bobbin thread correctly.
The fabric is wrinkled.You have not threaded the upper thread properly or fitted the Dobbin properly.Thread the upper thread and wind the bobbin thread properly.
You have not fitted the spool properly.Fit the spool properly.
You have not used the right combination of fabric, thread and needle.Choose a thread and needle that are appropriate for the type of fabric.
The needle is bent or blunt.Replace the needle.
If you are sewing thin fabric, the stitch is too thick.Sew with stabilizer material under the fabric.
The thread tension is incorrect.Adjust the tension of the upper thread.
Stitches are skipped.You have not threaded the upper thread properly.Correct the upper threading.
You have not used the right combination of fabric, thread and needle.Choose a thread and needle that are appropriate for the type of fabric.
The needle is bent or blunt.Replace the needle.
You have not inserted the needle properly.Insert the needle properly.
Dust has accumulated under the needle plate or in the bobbin case.Remove the needle plate cover and clean the plate and the bobbin case.
There is a highpitched noise while sewing.Dust has built up in the feed dogs or in the bobbin case.Clean the bobbin case.
You have not threaded the upper thread properly.Correct the upper threading.
The bobbin case is scratched.Replace the bobbin case. Contact your retailer or the nearest authorized service center.
You have not used a bobbin that has been designed for this machine.Incorrect bobbins will not work properly. Only use a bobbin that has been designed for this machine.
The needle threader can not be used.You have not moved the needle holder to its highest position.Turn the hand wheel toward you (counterclockwise) to raise the needle holder to the highest position.
You have not inserted the needle properly.Insert the needle properly.
The stitch is not sewn correctly.The presser foot that you are using is not correct for the type of stitch.Attach the presser foot that is correct for the type of stitch that you want to sew.
The thread tension is incorrect.Adjust the tension of the upper thread.
The thread is tangled.Remove the tangled thread. If the thread is tangled in the bobbin case, clean the bobbin case.
The fabric does not feed.The stitch is too fine.Lengthen the stitch length.
The darning plate is fitted on the needle plate.Remove the darning plate.
You have not used the right combination of fabric, thread and needle.Choose a thread and needle that are appropriate for the type of fabric.
The thread is tangled.Remove the tangled thread. If the thread is tangled in the bobbin case, clean the bobbin case.
The sewing light bulb does not come on.The sewing light bulb is damaged.Replace the sewing light bulb.

Brother Z-8550A sewing machine troubleshooting

CauseInspection/Remedy/AdjustmentReplacement if a malfunction
1. If the red LED on the power supply P.C. board is not illuminated: Malfunction of power supply P.C. board or transformerCheck the power cord. • Is fuse F1 or F2 on the power supply P.C. board blown? • Is the primary coil of the transformer burnt out?If fuse F1 or F2 is blown, replace the power supply P.C. board or transformer.
2. If the red LED on the power supply P.C. board is illuminated: Malfunction of transformer, main P.C. board or panel assembly1) Check if the secondary coil of the transformer is burnt out or if there is an open circuit.Transformer
If the power indicator (green) on the main P.C. board is not illuminated: 2) Check if fuse resistor R25 on the main P.C. board is blown.Main P.C. board
If the power indicator (green) on the main P.C. board is illuminated: 3) (Replace the part(s) indicated at right.)Main P.C. board or panel assembly
1. When (Err 740] is displayed: The cooling fan for the oil pan is disconnected or not operating, or the cooling fan inside the control box is not operating.1) Check if thread scraps are blocking the cooling fans (for oil pan and control box).DC fan motor assembly
2) Check that connector P23 (FAN 1) and connector P32 (FAN2) are inserted into the main P.C. board.
2. When (Err 65] is displayed: One of the keys on the operation panel is still depressed.Check that connector P21 (PANEL) is inserted into the main P.C. board.Panel assembly
3. When (Err 95] is displayed: Power switch was turned on while treadle was depressed.Return the treadle to the neutral position and turn the power switch off and back on again to check.Treadle unit
4. When (Err 90] is displayed: Poor connection for treadle unit connectorCheck that connector P11 (PEDAL) is inserted into the main P.C. board.Treadle unit
5. When [Err 91] is displayed: Problem with treadle unit settingsRepeat the standard settings for the treadle unit. (Refer to “12-3. Standard settings for treadle depression stroke".)
6. When [Err 450] is displayed: Problem with machine head memory data; Model selection cannot be loaded(Replace the part(s) indicated at right.)Machine head memory unit
7. When [Err 452] is displayed: Machine head memory cannot be verified.Check that connector P6 (HEAD-M) is inserted into the main P.C. board.Machine head memory unit
8. When [Err 403] is displayed: Poor connection between main P.C. board and PMD P.C. board1) Check that connector P31 (PMD) is inserted into the main P.C. board and that connector P1 (MAIN) is inserted into the PMD P.C. board.Harness. PMD P.C. board, main P.C. board
2) Check if there is a harness short-circuit.Harness
9. When [Err 401] or [Err 411] is displayed: Main P.C. board communication errorTurn the power switch off and back on again.Main P.C. board
10. When [Err 700] is displayed: Abnormal rise in power supply voltageCheck that the power supply voltage at the wall outlet is within the range of the specification voltage +/-10%.
11. When [Err 705] is displayed: Abnormal drop in power supply voltageCheck that the power supply voltage at the wall outlet is within the range of the specification voltage +/-10%.
12. When [Err 101] is displayed: DIP switch No. 4 on the main P.C. board is ONSet DIP switch No. 4 to OFF and then turn the power switch off and back on.
13. When [Err 200] is displayed: Needle zigzag motor is not connectedCheck that connector P5 (PMD) is inserted into the PMD P.C. board.Needle zigzag motor or PMD P.C. board
14. When [Err 131] is displayed: Encoder cord of sewing machine motor is not connected.Check that connector P13 (ENC) is inserted into the main P.C. board.Sewing machine motor or main P.C. board
1. When [Err 200] is displayed: • Needle zigzag motor cannot move to home position • Encoder cord of needle zigzag motor is not connected.Check that connector P3 (ENC) is inserted into the main P.C. board.Encoder P.C. board in needle zigzag motor
2. When [Err 201] is displayed: Problem with needle zigzag motor or problem with sliding resistance1) Check if there is too much or too little needle zigzag sliding resistance. (Check if there is variation in the load.)
2) Adjust the sliding resistance within the range of 1.2 kgf to 1.5 kgf.
3. When [Err 202] is displayed: Problem with home position adjustment data for needle zigzag motorCheck the home position adjustment.
4. When [Err 711] is displayed: Abnormal current detected in needle zigzag motor(Replace the part(s) indicated at right.)PMD P.C. board