Small Transformer Repair
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- čas přidán 4. 06. 2024
- Join David as he completes the repair of a small transformer used in a paper shredder power supply.
The first part of the repair can be found in the Coil Counter video here:
• Transformer Coil Counter
Music (Pinnacle 19.5 royalty-free music):
Pulsing Dance
House Fever
Reaction Time
City Night Groove - Věda a technologie
That's a tedious job but you got it man! Good job!
Thanks 👍
Man I love how easy going you take your mistakes and owns them!! I learned a lot with this video.
Glad it was helpful.. I'm often learning when I do these; and mistakes are part of learning.
1. When soldering thermal fuses clamp the leads with small pliers to sink the heat away from the heat sensitive element.
2. Always check it for continuity after soldering.
Those are great tips! Thanks for watching.
I realize this is an older video, but I have to say you earned my thumbs Up! I often wonder why others haven't tried to repair a burnt out transformer, especially a special one that just isn't made anymore. If you understand the action of any transformer and have the knowhow, why not repair or even rewind one... Once a winding opens up, that transformer stop working. So unwind the primary or secondary until you find that opening and repair it... Thumbs Up!
Thank you very much. I couldn't agree more!
Thank you
You're welcome. Thanks for watching!
Good job Dave.
Just learning about transformers so really useful, thanks for your candor.
Glad to help
HA HA. NICE VIDEO. I NEED TO REWIND AN OLD: CRAFTSMAN 12 VOLT BATTERY CHARGER. THIS IS MUCH THE SAME AS WHAT YOU WENT THROUGH. AS FAR AS THAT PAPER SHREDDER. I HAD A BRAND NEW ONE. ALWAYS GAVE ME TROUBLE. I FINALLY GAVE UP. TRIED TO INSTALL A MORE POWERFUL MOTOR. EVERYTHING WENT WELL, BUT SOMETIMES WOULD STILL BOG DOWN. I FINALLY GAVE UP. I BORED A BIGGER HOLE ON THE OUTSIDE OF THE PLASTIC CASE. I GOT RID OF THE MOTOR ASSEMBLY. PUT ON A SNAP ON SOCKET ON THE END. PUT ON A TWO FOOT SNAP ON RATCHET IN THE END. WORKS GREAT!!!!! I JUST USE MY RIGHT HAND TO POWER THE GRINDING AXEL. 100% MORE POWER USING SMALL AMOUNT OF BRUIT FORCE. WORKS GREAT FOR YEARS NOW.
Ambitious undertaking that went very well. Also like the, whether intended or not, channeling of Norm's old safety statement from the New Yankee Workshop.
His was one of three safety messages that I blended together to try to keep every one safe and me out of legal trouble.
Wow, and I thought I was patient! You did an amazing job! I stumbled on to your video looking for a replacement transformer, glad I did.
Thanks for watching!
Thanks for the excellent video! I love your approach, masterful and relaxed. I was wondering if the E-Laminations and I-Laminations are magnetized in a certain direction? In other words, would I need to remember which way is 'up' for each lamination and re-install it the same way?
Thanks very much for your help.
Thanks for the comment. No, the laminations are not magnetized in any particular direction. The magnetic flux is changes every time the current direction changes; so any residual magnetism would change the first time the transformer is energized.
this is so cool. you’re the man!
Thank you!
good video, I always want to make videos when I do stuff like this but I never do, thanks for taking the time to share your experience
Thank you for your comments.
Dave you did a great job on the video. I was just wondering if it was possible to repair a transformer myself. Your video answered my question. Thank you!
Glad I could help.
Very helpfull, instantly, as i'm repairing a teac ah300 stereo amplifier by replacing the thermal fuse, which i, phew, found just on the outside of the primary coil.
thank you
Glad it helped; thanks for watching!
amazing job ,having nice time by repairing the transmormer, and plus u did nice managment and smart the idia with the arduino cοuding
Thank you very much!
My E laminations seem to need more force to extract, than is required to deform them. I was hoping for some tips regarding that issue, but thank you for taking the time to make and post your experience.
Try to gently pry the laminations apart. They are usually soaked in varnish which will make them nearly impossible to remove in shear. It must first be separated from the adjacent lamination.
@@LifewithDavid1 Got It! Thank you. I had watched a video where the person had taken out several of the 'I' sections, I assumed so as to loosen things up first. This did not work for me.
Following your suggestion, and starting from the side I hadn't damaged yet, I separated the first E section using a long exacto knife, then slowly, gently, a couple of taps on each side of the E legs, the first E section came out undamaged, after about 10mins. Then separated and removed the next I section.
Once the first E was out, it was much easier to carry on. I, E, I, E .....
@@stepsvideos Glad it worked!
Sorry if it might be a dumb question, how did you know how many turns in total and 40 turns is missing? And how do you know the thermistor is broken? How to check if it is so at the beginning? I have also got a small transformer output 2V and 10VA for a walkman not working. I am not sure what make it not working, how to spot on the exact cause?
There are no dumb questions; this is a good one. I don't know how many total turns are in the primary; just the number of turns I took off. I used the coil counter I built in my very first video (now a little difficult to watch, LOL). czcams.com/video/2kpqVwZCH8o/video.html
I didn't know what was broken; I just knew there was an open circuit in the primary by measuring it with a volt-ohm meter. So I just started taking off wire until I found a break; it just happened to be the overload.
A lot of the "wall warts" for small personal electronic devices are switching power supplies. They really don't have power transformers. If yours does have a transformer, measure the primary and secondary. There should be some resistance (below 100 ohms); not a dead short or an open circuit in each coil. Smell is also good; if the transformer smells burnt; then it probably is and will need a rewind with new wire.
If it is a switching power supply; the best bet for a non-experienced person is to buy a new one. Switching power supplies are much more difficult to fix since there are tuned circuits inside that have frequencies of several hundred thousand hertz. Good luck and thanks for watching!
Great video!! I have a coil from an ignition magneto on a small lawnmower engine that I'd like to rewind. Do you have any thoughts on that?
I'm sure that could be done the same way. Make sure the high tension wires are wound in very flat, even layers to limit the voltage differential between each layer. Otherwise the insulation could fail. Examine how the coil is wound as you are taking apart and try to wind it the same way. You may need to make a special jig to hold the coil while winding it depending on how the frame comes apart. I believe there is a CZcams video by someone who rewound an early (1928?) Briggs and Stratton coil.
@@LifewithDavid1 Thank you for the advice and I'll look for that video.
Hello, my old stabilizer transformer is making noise, can apply epoxy on the middle coil?
Usually noise comes from vibrating plates in the core. I think it would be difficult to get epoxy in there; especially if the core has already been coated before. You might try wedging the core a little with some wood between the coil form and the core. That MIGHT stop the noise. Just be careful not to do any damage to the coil. Good luck!
scatterwound! could have maybe taken a close up of that resistor job. thanks
I had just started doing videos and I didn't have a good shot of that. Sorry.
Dave I don't really feel comfortable repairing my own transformer. Do you accept work?
I understand your hesitation. I didn't want to dive into mine either; but I realized I had no other choice. That exploration started my video making journey to help others dive into these type of projects. I'm sorry, but I don't do any outside work. Maybe check with a local ham radio club or high school shop teacher to see if they have any leads on people that could help you with this. Good luck and thanks for watching.
Great video, thanks David. I have a 110VAC Sony CD Player that I accidentally plugged into a 220VAC outlet and it's transformer is toasted, it's fuse did not blow oh my, one day I'll try this (though I don't know when LOL), greetings from the Philippines.
Thanks. Before you dive into the transformer, I would check its continuity. Transformers are pretty robust and the failure might be with the semi-conductors in the power supply or beyond. Good luck!
@@LifewithDavid1 Thank you, will do.
Would you consider repairing a small transformer for me? It's off a circuit board.
I appreciate the offer. However, I'm not set up to do that kind of work; so I'll have to decline. Sorry.
Great how to video, very educational. Time consuming but could be economical with larger transformers, or like you said vintage hard to replace Ts. In this case a cheap eBay replacement would have been more practical. In my case I was lucky or maybe you were unlucky? My blown thermal fuse was on top so I only had to remove the outer layers of tape and solder in a replacement fuse.. Thanks for sharing!
I'm glad it was easier for you. Sometimes the journey is half the fun. Thanks for watching!
Have you ever repaired an antique 1951 phonograph motor before ? its fir my wilcox gay record -o-fone. disk cutter..
I haven't rewound an older motor; however, I've rehabbed them, cleaning the commutator, and cleaning, polishing, and lubricating the bearing surfaces. If the windings aren't damaged, then that might restore the motor.
@Life with David It is beyond economical rapair, becuase low power transformers for main voltage aren't so expensive, but I understand that you did that to see if you can and 4fun... Fo example 10A transformer may be expensive, so it worth it for sure, but for example 1 -2A are cheap, so you know... I woould say nah, too mych afford, it's not worth it...
Thanks for the comment. It's good to have the skills. For instance, I had the transformer of Heathkit Oscilloscope fail. This had multiple windings and multiple voltages. Luckily, I was able to get a replacement from Heathkit (it was many years ago). However today if I couldn't fix the transformer; I would have to trash the scope; since I wouldn't be able to get a replacement; regardless of cost. Thanks for watching!
Repect
Thanks!
Good video what type of Varnish did you use? I have a Vintage Big Transformer, I re-moved the rust w brush a little WD40 But some of the outside edge E and I are loose now. Looking at cleaning w Isopropyl Alcohol for more cleaning and to get rid of any WD40 than use use super glue? than varnish it.
I used a good one part polyurethane finish. It seems to hold up. Good luck!