Brother LS-2125 Mechanical Sewing Machine - Answered Questions & Fixed issues

It should be in your manual.... but if you don't have one, I'm gonna try this out. I don't know the official names, so bear with me.


There should be two plastic arm-lookin things that are turnable. Make sure these are turned outwards.


You should have three silver pieces. The one you need first is a half-moon looking thing with a knob comin out of the middle. (it also has some holes in it)


If you turn the big knob on the right hand side, there should be a moving piece on the inside of the bobbin case.


The half moon needs to fit in with that piece. Don't force anything cause we don't want the machine to break. >< The knob thing needs to be facing the outside, otherwise it's not gonna go in at all.


Once you get the half-moon thing in there, you have two more left. There's a big circle. WOO! CIRCLES! ANYWHO, The big silvery circle.. it has a knotch in it, and a little pokey-outie thing comin' out of it.


It needs to be positioned so that the knotch (on the inside of the circle) is up and the pokey-outie piece (on the outer side of the circle) is on the bottom. On your machine, there should be a place where the pokey-outie piece would fit perfectly into a little hole-type-thing. Put it in. :O


Now it's time to move those little black plastic arms towards the center. On your circle, there should be little grooves that they fit right on top of. ^_^


The only silver piece left should be the actual bobbin case deal. This should be a smaller circle with a movable arm and a silver thing pokin' out of it. (I told you, I'm bad at names!) Before you put this guy in, we need to have your plastic bobbin threaded. (I'm assuming this has already been done, correct me if I'm wrong.... they also have pre-threaded bobbins for sale, but hey, whatever works.)


Your bobbin needs to fit inside this last piece. (my first bobbin didn't, and I freaked out and ran to my dad... LOL) You need to make sure there is a trail of thread coming out of your bobbin that's about two to three inches long. Place your bobbin in the silver guy and there /should/ be a little niche where you can play with the thread and pull it through the silver guy's parts. (Your thread may break, don't worry, just try again)


When you move the thread around, it should come out where the little arm that sticks out is. Keep the 2-3 inch trail goin' on, you'll need it. Remember that first half-moon silver guy? Well, we're gonna stick our little assembly onto his pokey-outie piece.


The silver arm-thing on our assembly needs to go into the knotch that's in our circle, and push in so it clicks. (Sometimes mine clicks twice...) Make sure you have that trail of thread, and go ahead and flip the white plastic up, because you're DONE assembling it.


I'm going to assume you have your top thread in already (again, correct me if I'm wrong..) make sure that your top thread is through the hole in the needle, otherwise we're thoroughly screwed. Pull that thread until you have another 2-3 inch tail, and twist the big white knob on the right side of your machine (same one as before...) TOWARDS you. KEEP HOLDING your top thread, otherwise it'll disappear into the abyss that is your bobbin assembly.


When you turn the knob towards you, your needle should dip down into the abyss and come back up- with your bottom thread! HUZZAH! it SHOULD be a loop around your top thread. (I'd use contrasting colors for practice.. so you know what it'll look like)


The manual says to "grab the bottom thread" but seriously, I can't get me fingers down in there, so I just slide some scissors under the foot and between the two sides of the loop, and just slide 'em left. usually works just fine. Unless my tail for the bottom thread is too short, cause then it'll be hard to grab. You should be good to go!


I know this is pic heavy and kind of long, but I like to provide as much info as possible! Let me know if it helped!!

Brother LS-2125... | Answered on May 15, 2019 | 22,881 views

Make sure you are using a brand new needle--a dull/damaged needle will skip stitches.

As for the feed dogs, if it is a mechanical machine it's possible the machine is seizing from old dried oil.

Wheel on right side that controls the needle up and down is very tight...


Brother LS-2125... | Answered on Feb 09, 2018 | 193 views

hi sometime tread or bits can get caught around the button there might be a screw on the side of your button if there is see if its tight take a torch and shine it down around your button to see if any thing is stuck around it gently take a pair of tweezer and remove the obstruction then tighten the button if you have you manual take a look and it will show you a picture of the works this may help you i hope this i of some help to you

Brother LS-2125... | Answered on Feb 07, 2018 | 138 views

Brother LS-2125... | Answered on Apr 30, 2017 | 393 views

Perhaps you will find the answer here:

LS 2125 2125i 2129 United States Brother Solutions Center

FWIW, the manual indicates that your feed dogs do not lower. Instead, you are provided with an accessory that covers the feed dogs when you wish to use the machine without feed dogs.



Brother LS-2125... | Answered on Jan 15, 2017 | 1,207 views

Firstly you need to ensure your needle is centred, remove the presser foot for a bit of room, lower the needle down into the needle plate, and then measure from the needle to the right to each marking on your needle plate.

If you are in the USA, then I'd guess there would be three markings at 1/4" 1/2" and 5/8". Quarter inch is your narrow seam for quilting but if you are sewing garments, then the seam allowance is usually 5/8", it would be marked on your paper pattern though. Some patterns such as Burda came with no allowance and you need to add them on, again it would be marked on the pattern though.

If you are in a metric country, then it will probably have 10mm, 15mm and 20mm marked. Normal seam allowance is 15mm.

If you have trouble remembering which marking to use, you could always stick a strip of masking tape onto your plate along the line you use for seams until you get some sewing experience.

You might like to visit, Debbie Cosgrove gives loads of very useful information there, a learn to sew page along with some free projects. At the tender age of 10 I recall sewing an apron and triangle scarf in home economics as my very first project on an Elna Star SU, simple projects are best when starting out.

If you are going to sew garments, then you may also like to check out, I love this site as members share their experience with commercial sewing patterns, some very talented sewists there; many of them have their own blogs too.

If you can find a sewing beginner class, take it, it will get you started with basic techniques that patterns don't really give you and help with that initial learning curve. And my last suggestion, invest in a good sewing textbook; I've got the Vogue Book of Sewing, and also the The Sewing Book by Alison Smith published by Doring Kindersley; I love this one, loads of great images and its a fresh publication. Bit pricey but if you could always ask a loved one to buy it for Christmas. Feel free to connect to me if you have any other sewing questions, I'd love to help.

Happy sewing

Brother LS-2125... | Answered on Jan 04, 2016 | 274 views

Breaking thread could be caused by a couple of things:
1) top tension too tight
2) machine not threaded correctly
3) poor quality thread (don't use bargain thread)
4) needle not compatible with thread/fabric
5) needle installed incorrectly

First thing to try is remove all the thread from the machine, RAISE the presser foot so the thread will seat properly in the tension disk, then re-thread from the beginning--make sure you do not miss any steps.

Usually the factory standard tension setting is with the dial set at the mid-way point between the low and high number. The tension is correct when both the upper thread and the bobbin thread meet in the middle of the fabric.

As a reminder, since your machine is a mechanical, be sure that you are cleaning and oiling on a regular basis. Use ONLY fresh good quality sewing machine oil (not 3-in-1, WD-40, cooking oil, or the old oil from grandma's sewing basket). Follow the instructions in the manual. If you want to do a thorough job, open the top and free arm cover. Slowly hand rotate the handwheel and apply 1-2 drops of oil every place that metal rubs on metal. Do NOT oil rubber, plastic parts or belts. Be sure to apply a drop on the shuttle race every time you begin a new project. Oiling according to the instruction manual should be done every 40 hours of sewing time. If in storage, oil every six months.

Here's a web site that may be helpful:
Sewing Machine Problem 1 Thread Breakage

Here's a manual for your machine:

Here's information about needles:


Brother LS-2125... | Answered on Dec 03, 2015 | 135 views

If it has gone into Safe Mode, then most likely something serious is amiss with your machine. Consult your owner's manual in the Troubleshooting Section for suggestions to resolve your problem. Short of resolving the problem yourself, it may be wise to take it in for service...

Brother LS-2125... | Answered on Nov 01, 2015 | 135 views

Top thread problem, Not enough tension on top=loops on the bottom of the fabric; too little tension on the bottom = loops on top of the fabric. Yes, I know it seems backwards. See:
Dollars to donut holes, you either threaded the top of the machine with the presser foot down (it has to be UP to let the thread into the top tension), or you're trying to sew with the presser foot still up (which is an issue common to people trying to sew bulky seams).

Take the thread off the top of the machine, take out the bobbin case and give the machine a cleaning, rethread the machine, fetch up the bobbin thread and hold the bobbin and top thread ends together under and behind the presser foot for the first 2-3 stitches of each seam.

Brother LS-2125... | Answered on May 26, 2015 | 219 views

test the outlet is working ok, then test the power adaptor, ensure the light on the machine is on and try working your way up the cable incase the cable is broken, if there is no light on the adaptor but is g etting warm after a while then one can assume it is working but this is not a 100% test. if it stays cold it could be defective and needs replacing. if you have another adaptor of the same type try using that to see if the machine works. best is to take to a repair shop or send it back to Brother if it is still under garantee.

I hope this was useful.

Brother LS-2125... | Answered on May 20, 2015 | 106 views

i have an old brother machine maybe back in the 60s-80s and the thread keeps coming out of the needle and i dont know how to do anything with the bobbin.i have no idea how to use the machine at all.i would love to learn any help.cant find any thing online to help.

Brother LS-2125... | Answered on Mar 30, 2015 | 637 views

If it isa top loader the thread goes in so it unthreaded clockwise. If bobbin goes in under the foot by removing the front arm panel slide then the thread goes into the bobbin holder so it unthreads by having thread go through the feed pulling up from your left hand side. This enables the tension to be balanced and not cause binding issues.

Brother LS-2125... | Answered on Feb 22, 2015 | 61 views

You may need a shank adapter. Most dealers have them available.

Brother LS-2125... | Answered on Feb 03, 2015 | 110 views

You probably will have to get a professional for this one as you would have to dismantle quite a bit of the machine and then the timing may go. Which would be impossible for you to fix yourself.
Good luck.

Brother LS-2125... | Answered on Jan 02, 2015 | 117 views

Looking at a pic of this model, there are two dials on it. One near the top, one much closer to the needle. I believe the tension dial is the one that's close to the needle.

I don't quite understand what the problem is with the stitches from your description, but first try the tension dial. Reset it to zero and then try each setting, one by one, to see what happens.

If stitches are still wrong, a few things always to try when there are stitch problems. Clean well around the bobbin case, remove all lint. Do this often anyway, it's not good to let lint build up.
Try a new needle and a new spool of thread. Rethread the machine, a few times if need be. Try a new bobbin too, or wind a new bobbin to try from a new spool.

Try to get a manual for this machine. If Brother no longer has manuals, there are many sites that sell manuals for many machines. A manual can be your best friend when there are problems.

Brother LS-2125... | Answered on Nov 26, 2014 | 91 views

The tension may be incorrect, or the upper tension mechanism might be worn or damaged. Have you tried it on all the tension settings ?

Things you should always try when there is a thread problem; make sure the bobbin case area is well cleaned out, lint can cause many problems; try putting in a new needle; try a new spool of thread. Try rethreading the whole thing, a few times if need be.

Check every thread guide to be sure none of them has a nick or rough spot on it that may be damaging thread as it passes by. Change needles often, they get dull and worn and can cause issues. Even a brand new needle may sometimes have a burr in the eye, which will abrade thread and cause a lot of problems. Always have a few new needles on hand to try.

If it's still bunching up underneath after trying all that, the upper tension setting might be too loose. Tighten it, one setting at a time and stitch, check to see if things improve. If there is no setting on the tension dial that will give you a nicely balanced stitch, then it may need a new tension mechanism.

Some machines can be really picky about thread, so using very cheap thread can cause a lot of problems. If you've bought cheap thread, it's not worth the money saved.. buy good thread instead. The cheap stuff might do for hand basting maybe.

Brother has an excellent service department, one of the best I've ever come across, if all else fails.

Brother LS-2125... | Answered on Nov 26, 2014 | 519 views

Because of the noise it sounds like a motor problem! The fuse is in the mains plug and is easily replaced!

Brother LS-2125... | Answered on Nov 09, 2014 | 285 views

change the power chord of your pedal, if not, open the pedal and look for the connection if that is cut or loose try to tight or connect it.

Brother LS-2125... | Answered on Oct 31, 2014 | 541 views

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