Quite difficult to get at this coil. I believe the key cable has been "hot" with RF, causing enough current to flow to burn out this little SMD choke. I experienced a similar thing with a Yaesu FT757GXII, had a transistor in the KEY ground return which burned out. This was a much easier fix, though..
I agree. I have a Xiego G90 with the similar problem. [ my fault, Im sure. I was running another radio at the time] RF in the Ground Buss will lead to this. Dont Run 2 radios at once . :(
Inave made a small key breakout box which allows all key types to all radios.. inside I have wound the wires round a toroid.. also have a switchable capacitor for radio/key combinations that require it.. Hopefully this will alleviate any extraneous RF problems
Interesting using a ferrite bead as a fuse. 🙂 Well two functions 1: Lowers emissions on the ground wire 2: Limits the DC current to less than 400mA Makes you wonder if there was enough RF in the shack to give a high ground current. 1K @ 100MHz may have enough impedance at HF to get hot when trying to block RF getting off the key wire to ground.
I am curious, plus I am unsure how they work, but could it be that the operator plugged an electronic keyed into the rear jack? Do you think that might be the issue that lead to that filter burning out? Thank you for investing the time into making these videos. - Phil
Hi HBT ! This issue can occur when there's no radio frequency grounding at the station. The solution would be to use a Ferrite and run the CW key cable through it with several turns to isolate the RF feedback coming from the cable or the equipment's casing. Regards.. 73 - PY2NDB
Peter, I would have left the faulty choke on the PCB and just wired a new choke near the jack connector directly to earth. This would have resolved the problem without touching the PCBs.
This tiny inductor will NEVER fail so let's install it deep inside the radio. Well, Peter has tossed that engineer's theory out the window. Thanks for the Saturday morning video, have a peaceful weekend.
Well , lets see , I've said it before but I will mirror a previous comment. Awesome, inspiring and helpful, your presentation brings mych joy to all of us here in the radio / hobby world . Thank You for sharing these posts 👍👍
hello. nice vid. operator has most likely grounding issues, in conjunction with using a qro and high swr on antenna / feeder system, or he is for some reason keying with a software that connects the pc to that input via a serial port / adapter, and the setup, in this case, has a current loop.
Hi Peter once again another repair video, peter you wonder what caused the componet to burn out Peter as you say that componet like acted like a fuse to protect some other parts of the circuit
Oh my goodness 3 stages deep demontage into the jungle of electronics, i think this work is more worth then some of this new one radios like a technical investigation cost normaly in industry 100 tousand dollar per solution. (Da hatte wohl einer ne schlechte Stewelle und ne lange Leitung dran , hätte auch die main CPU treffen können..
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Nice and easy repair but thanks for sharing this repair my dear friend. 73s Pasquale IW0HEX
Thank you my friend!
Hope that you had turned off the T/R switching when you keyed radio without any load hihi ;) good job Peter!
BK-in ist off
Quite difficult to get at this coil. I believe the key cable has been "hot" with RF, causing enough current to flow to burn out this little SMD choke. I experienced a similar thing with a Yaesu FT757GXII, had a transistor in the KEY ground return which burned out. This was a much easier fix, though..
I agree. I have a Xiego G90 with the similar problem. [ my fault, Im sure. I was running another radio at the time] RF in the Ground Buss will lead to this. Dont Run 2 radios at once . :(
Inave made a small key breakout box which allows all key types to all radios.. inside I have wound the wires round a toroid.. also have a switchable capacitor for radio/key combinations that require it..
Hopefully this will alleviate any extraneous RF problems
Interesting using a ferrite bead as a fuse. 🙂
Well two functions
1: Lowers emissions on the ground wire
2: Limits the DC current to less than 400mA
Makes you wonder if there was enough RF in the shack to give a high ground current.
1K @ 100MHz may have enough impedance at HF to get hot when trying to block RF getting off the key wire to ground.
Good job 👍 😅
I am curious, plus I am unsure how they work, but could it be that the operator plugged an electronic keyed into the rear jack? Do you think that might be the issue that lead to that filter burning out? Thank you for investing the time into making these videos. - Phil
I was going to ask the same thing. lol
Hi HBT ! This issue can occur when there's no radio frequency grounding at the station. The solution would be to use a Ferrite and run the CW key cable through it with several turns to isolate the RF feedback coming from the cable or the equipment's casing. Regards.. 73 - PY2NDB
👏👏👏👏👏👏👍👍
Peter, I would have left the faulty choke on the PCB and just wired a new choke near the jack connector directly to earth. This would have resolved the problem without touching the PCBs.
yeah you can do that if you are doing for you own..
Hi..great job, wich is the value of that component ? May be nice to understand why that impedance has been destroy . '73 .
Thank you for the peek inside. Very odd thing. I am so curious how it happened. The jack itself is made of plastic. Good video as always.
It's a joy to watch a skilled technician methodically look at a problem. Thanks for sharing with us!
thank you!
That component saved a lot of money overall. Icoms are so well designed
This tiny inductor will NEVER fail so let's install it deep inside the radio.
Well, Peter has tossed that engineer's theory out the window.
Thanks for the Saturday morning video, have a peaceful weekend.
lol
Hello Peter, as usually another great video showing the fault, 73.
I1WSM
Thank you
How much total time did it take to replace the component? Also, i really enjoy watching your videos. They are very informative. Thank you.
2-3 hours. I did similar repair in 7610
Well , lets see , I've said it before but I will mirror a previous comment. Awesome, inspiring and helpful, your presentation brings mych joy to all of us here in the radio / hobby world . Thank You for sharing these posts 👍👍
Thank you!
hello. nice vid. operator has most likely grounding issues, in conjunction with using a qro and high swr on antenna / feeder system, or he is for some reason keying with a software that connects the pc to that input via a serial port / adapter, and the setup, in this case, has a current loop.
yes definitely one possible explanation...
TRX LAB Please send me your emailadres for contact for a repair Kenwood ts 940.
Very interesting. I noticed that you are keying the xmiter with no 50 ohm load on the output.
You can do that if BK is NOT engaged
Oh what a treat peter. Seeing a new anticipated Post from you, is like going to the candy store as in my youth.
Thank you, really glad that you like it so much!
I'll request you to make videos on baofeng radios as well
very seldom on the bench..
Peter is a wizard. ONLY guy I would working on my stuff!
Outstanding repair.Thank you.
Thank you nice repair, one of the simpler ones to follow along with
TNX Peter, have nice Day. 73 😉
Dir auch!
Hi peter, thx for your effort doing videos, a weekend is bettter when we have a nice video from you to enjoy. Thx
Thank you
Hi Peter once again another repair video, peter you wonder what caused the componet to burn out Peter as you say that componet like acted like a fuse to protect some other parts of the circuit
we'll never know 100% a lot of crazy things can happen..
Oh my goodness 3 stages deep demontage into the jungle of electronics, i think this work is more worth then some of this new one radios like a technical investigation cost normaly in industry 100 tousand dollar per solution. (Da hatte wohl einer ne schlechte Stewelle und ne lange Leitung dran , hätte auch die main CPU treffen können..
LOL yeah down to the jungle..
@@TRXLab lol hopefull to find no süswasser..
Really?
LOL yes Wolfgang
@@TRXLab 😁