I guess I'm extremely bored so I watch old videos. You are one superb technician. I really enjoy your videos. I think I learn something every time I watch. Thank you for the videos. I'm just an old retired technician. W Rusty Lane K9POW in eastern Tennessee
Please never change the way you make your videos. I love the clicking of pushing the button between each shot. You always stay calm and explain very slow and clear. This is really educational for people who are not an expert in electronics.
Better than a new board. That was a really nice repair. Very complicated but the finished result was perfect. Always learn something new from you. Danke Peter.
Its even rarer to see that someone mistake inductors for caps (the green parts were marked with an L in some places) on a board that had the rare PCB failure (the only way I could think that pattern of cremation could occur.)
Amazing Job Sir. Most would have just told the customer it needed a new board and if they could not afford it. Told to sell it as a parts radio. Amazing skill sir. Well done. 👍 73.
Again a great repair job by Peter ... He can be entrusted with repairing any radio ... hats off gentlemen ... 73s de DL6RDE/AA1KD, Karl-Heinz "Charlie"
I watched a lot of TRX Bench the last years. These videos really are electronic detective movies with always a good outcome. Told by a calm person. I really can sleep well to this videos and also learn something. Compliments
Hi Peter, good job. I have a little addition to setting the idle current process. It's in my opinion much better to do this in DIG (not PKT) mode than in SSB. DIG is the same thing as a SSB (LSB or USB, can be set somewhere in the menu), but the radio expects modulation from the 6-pin miniDIN socket on the back (which is in fact low impedance line input) EVEN if you press the PTT on the microphone. So if push the PTT on the microphone in the DIG mode and you have nothing connected to the 6-pin miniDIN socket, you are in fact transmitting in SSB mode with completely muted microphone, which makes setting the idle currents much easier and precise.
Very nice video! Glad to see that you did not give up on that board! I worked in commercial comm back in the states for 20 years and was a dealer for Uniden commercial radios back in the day. They were fairly reliable however those little green caps on the final were always junk. As a habit we always replaced all caps around drivers and finals but to comply with warranty work we always sourced from Uniden. Is there an EU supplier for these caps? I have a first gen 857 ( not a D model) and it is probably equipped with same trouble makers. It might be worth my time to replace them as a preventative measure. I don't know if that final for the original 857 is available still, if not a ounce of prevention is better than junking the whole unit if that PA fails. A word of wisdom from past experience. Try to clean off as much of that carbon from the board and reseal the area with a high voltage corona dope. That carbon is conductive and can cause some issues. Take care and keep those videos coming!
Hi, thank you for this very interesting post. I imagined changing an MCU to be much more difficult. I find your approach to error analysis (also in the other videos) super and very instructive! Many thanks for this. vy 73 Andreas, DL5LC
Great job as usually dear Peter. I had the same problem with Icom 775's the PA final stage ; I rebuild with new PCB burned zone. As in your case, there was a loss between 13.8 volt and GND traces with a huge current between. I think this can happen with the PCB heat or humidity, I don't know exactly. Best 73s and thanks for sharing. Pasquale IW0HEX
A great repair and carried out very professionally. The test equipment is very interesting also. Super video. Thanks for letting us all look in. 73 de GI8WFA and stay safe.
Glad you went ahead and fixed it. That radio is no longer in production and factory repair isn't really an option. 857D is my favorite "swiss army knife" radios of all time. Especially with a wide band collins filter.
Nice a very well explained repair as usually peter. Its always a pleasure to have a sunday with one of your funny videos. Thx for your time, always learning something. Many comments and few likes, come on boys!!
Hi Peter it’s good to see your videos again I really definitely enjoy them. And you did a fantastic job on that 857, actually your repair job looks better than the factory I’m very muchly impressed. And how you are able to work with the SMD is phenomenal. Hello from the Texas hill country. 73 WD5ENH Steve
beautiful repair....... you do the repairs the factory would not do , that is why I love your videos . You truly are a master technician . That is a repair I would also attempt myself , though probably not as nice looking as yours hahaha. Many thanks.
Hi Simon, good to see you! The internal SWR bridge does a quite good job to prevent a PA failing by high SWR but trying to match a bad antenna creates sometimes very hight voltages or simply the cap got a crack and starts burning under high voltage..you never now 100%..
Hallo Peter super Video ich suche eine gute Werkstatt für meinen 857d das er wieder Fit bzw abgeglichen wird hättest du eine Adresse für mich Viele Grüße Thomas DD4ST
Good Job and happy radio owner, better than a surgeon.. i know sometimes it's not easy find a replacement part such as special cap for UHF, maybe a NPO cap can be used. What do you think about "short killer" device for you lab ?! Regards'73 .
Yes you are right getting components is getting more and more critical. Even if you order by the manufacturer it happens that you get a back lock info of 8 month. So happened actually with a Icom IC 7100...
Peter super repair Good Job you saved the customer alot of money as Yaesu wouldn't do that repair they would only sell you new board which would cost $700.00 or more maybe suscessful repair well done :)
Remove the screws before unsoldering transistor would help with the heat transfer to the heatsink while removing it. It will save the traces on the board.
Once again a nice radio has been safed, good work indeed! I guess the cap shorted out, an the owner could be happy that the short stopped while burning. There was enough material left to give it a try, and you succeeded. Peter, may you plan to collect the charcoal from all the burned radios? You can get a nice diamond if you press it hard enough ;-) Just kidding. Nice video, good work. 73 de Olaf, möge der Sommer endlich kommen!
Thanks Olaf, yes I'm doing this job only to collect enough charcoal to start a diamond production one day lol. Ja nach all dem Regen und Unglück hoffen wir das der Sommer beginnt. Hoffe Du bist verschont geblieben von den Fluten...73
Such a part of the burnt printed circuit board must be cut out with a cutter or dremel and the conductors must be restored. Otherwise, high-frequency voltage will constantly break through here. Good video. Like.👍
Thanks Peter, great video as always. I don't think my FT-817 has a Smoke Signal mode, at least not what I could find in the menus (which is probably just as well). I'll stick to CW as my lowest common denominator. 73, Jan Henkins - M7HNK
Hello, I was watching this again and was wondering if you have made a video on the FT857 that had lines going through the display ? I have 2 FT857's and one developed lines through it,,,, if you have done this could you reference the video number ,, Thank you Ron AC7RH
I would have liked to see the testing of the individual components that were questionable in this video; I know it would make it longer but I think it would also make a better training video, in order to make it more thorough as well, to make it more informative as well.
I have an 857d thar recently started behaving strangely. The heat sink gets warm while sitting in receive, with a noticable higher noise floor. It was suggested that the PA relay may be stuck closed and there is PA idle current flowing. Is this something youve seen before?
You are right about the factory would not repair this kind of problem. I work on somewhat similar aviation equipment. I could not get away with this kind of repair due to the nature of use. My own stuff I will and have. I knew that something else caused this failure. this is good education for all of us.
Maybe the 1st in yrs. that I would have gone one more step . Grind out the carbonized fiberglass , and then fill in fiberglass powder / epoxy . I am more of a mechanic , not as much of electronic technician as you ? Thanks again
Thanks for comment and yes that would be a good idea but since we have a multi layer PCB it is very risky to grind it out. With the new bridge wires installed we have it somewhat solid and from my perspective it is the maximum we can do...
@@TRXLab I would have still filled the crater with epoxy just for the insulation from the burnt fiberglass. I used to repair very high horsepower AC motor drives, I often got in final boards that had burnt spots the size of a nickel . If you didn't clean every last bit of black out of the hole it was guaranteed to come back on you as a warranty repair. I kinda miss that job, one of the few jobs were I got to stay in one place and just work on broken stuff. My training is radio repair in the USAF so anything with RF interests me. Good job getting that final repaired. I would be interested in seeing how long that repair lasts.
Hola Peter, tengo un FT-857D que calienta mucho en VHF & UHF con carga de 50 ohms independientemente de la potencia hay mas de 40 grados centigrados sobre el disipador, V/UHF Idling Current Adjustment seria una solucion? mil gracias!!! exelentes tus videos, saludos LU1DVH
hi Peter nice video and content as usual! IMHO I’m used to recover from bad shape vias or trough hole connection introducing a piece of copper bonding cable for one side to the other one and solder whenever possible the cable on the pads where the via comes out… I don’t know if you really get what I meant due to the poor explanation. By the way I really envy your deep knowledge and expertise! Keep on rocking
Smoke signs ... Great! This is what makes electronics related videos go viral :) :) ... and I instantly had a lol when I saw the big inline fuse on the power cables :) ... there is nothing like safety:) Now one serious question, why not remove the screws Before applying solder ..it's less thermal mass hence faster soldering ... just saying ...
@@TRXLab Of course, but I was referencing the part right at the begginning were you were removing the blown out power mosfet. a simple minor thing really not at all an issue specially because you have great top of the line tools for soldering and desoldering. But I prefer to remove the components with least possible thermal mass around then. BTW Great Video and you are totally right ... such board can perform for a long time and any brand would classify that board as not possible to repair ... Well it seems like the right to Repair movement is going Global and getting a lot of traction* ... * (and yes this last sentence is a pun intended for John Deer farming machines :) ).
@@John_Smith__ Ah okay I see, of course you are right John, but as long I don't feel the pain as the power of my soldering gear is powerful enough one don't think about that.
@22:11 question for you. Would you have taken the time to remove the carbon from under the trace, then epoxy the trace to the undamaged part of the board. I am asking this question as I am watching the video so you might have already answered the question.
Similar issue. Mine has has lost it's full 50w/20w vhf/uhf output as well but still puts out milliwatts. Had a slight burning smell just prior to failure. Any thoughts? 73
Hello, the RD70HVF1C is specified for 75 W in the datasheet which i would consider to be the effective power. How comes that you can reach 100 W with the device, is that peak to peak power displayed ?
Also...ich als deutschsprachiger freue mich ja das Du so langsam sprichst...so verstehe ich alles.Aber für nen Engländer muss das ja echt gruselig sein....Ich habe mir schon sehr viele Deiner Videos angesehen und bedanke mich auch für dieses recht herzlich
I have a FT-857D that I paid $715 for, how can Yaesu charge for one board? Replacing the VIAs with solid wire is standard operating practices. Where is all of the is high Voltages (requiring high Voltage capacitors) coming from? 50 Watts into fifty Ohms in no where near high Voltage. Ron W4BIN
To swap out the board is quite expensive. High voltages coming from reactances since we do not have a real output resistor in ohms. The impedance is a complex resistor which gets critical if you get to resonant points...
I think the through hole plating on the 12V line to the final could not handle the current. especially if no solder was flowed through the 4 holes. This would cause the "Toastiness" and slow burn. The film capacitor was just there for the hot ride. PooF'
I guess I'm extremely bored so I watch old videos. You are one superb technician. I really enjoy your videos. I think I learn something every time I watch. Thank you for the videos. I'm just an old retired technician. W Rusty Lane K9POW in eastern Tennessee
Please never change the way you make your videos. I love the clicking of pushing the button between each shot. You always stay calm and explain very slow and clear. This is really educational for people who are not an expert in electronics.
This is why I like watching TRX Peter doesn't give up easy. Good job Bravo!!
Thank you
Another excellent video by peter a great learning experience and very enjoyable to watch. Great teacher Enjoy his videos. thanks Mike
NOT a repair I would have attempted! So you have once again earned my great respect, Peter!
Thank you!
@@TRXLab You have the technical skills to fix, such a problem like this!!👍
Better than a new board. That was a really nice repair. Very complicated but the finished result was perfect. Always learn something new from you. Danke Peter.
Thanls
I'm no good at electronics, but I sure enjoy your expetise and ability to fix something instead of just replacing parts (ie circuit board). Thank You.
These type of videos are truly inspirational. Thank you TRX Lab.
It's not very often you get to see someone who can put the magic smoke back _into_ a piece of equipment!
Impressive repair Peter. 🎯
lol thank you!
Its even rarer to see that someone mistake inductors for caps (the green parts were marked with an L in some places) on a board that had the rare PCB failure (the only way I could think that pattern of cremation could occur.)
Amazing Job Sir. Most would have just told the customer it needed a new board and if they could not afford it. Told to sell it as a parts radio. Amazing skill sir. Well done. 👍 73.
Thank you
Again a great repair job by Peter ... He can be entrusted with repairing any radio ... hats off gentlemen ... 73s de DL6RDE/AA1KD, Karl-Heinz "Charlie"
Thank you Charlie!
I love waking up to a video like yours and having my morning coffee,, Thanks for another fine video !!
glad to hear that! Thank you
You fixed the radio....for crying out loud why would anyone thumbs down that ? What more could they do ?
Excellent as always..
Thank you! Well there are always trolls which we simply ignore...
Great video as always! 73's
Beautiful job with the new transistor. That's a work of art!
Thank you
I watched a lot of TRX Bench the last years. These videos really are electronic detective movies with always a good outcome. Told by a calm person. I really can sleep well to this videos and also learn something. Compliments
glad to hear that thank you
Great work Peter. Thank you for what you do here!
Thank you
He give hope to others repair..
D'OH! Smokeyy...
Hi Peter, good job. I have a little addition to setting the idle current process. It's in my opinion much better to do this in DIG (not PKT) mode than in SSB. DIG is the same thing as a SSB (LSB or USB, can be set somewhere in the menu), but the radio expects modulation from the 6-pin miniDIN socket on the back (which is in fact low impedance line input) EVEN if you press the PTT on the microphone. So if push the PTT on the microphone in the DIG mode and you have nothing connected to the 6-pin miniDIN socket, you are in fact transmitting in SSB mode with completely muted microphone, which makes setting the idle currents much easier and precise.
Thanks Niki. Yes good point with DIG
very2 clear dealing in the repair good upon the good in learning ,many thank from 9M2DU
thank you
Has same problem 2 times.I soldered copper wires to restore the transition between the sides of the board. Like and good luck!
Mine 2x as well! BUT, mine still has what I believe is driver/milliwatt output and TX/RX sounds fine. Do you by any chance do repairs? 73
Thank you sir for another fantastic video and repair.
Thanks for watching
Very nice video! Glad to see that you did not give up on that board! I worked in commercial comm back in the states for 20 years and was a dealer for Uniden commercial radios back in the day. They were fairly reliable however those little green caps on the final were always junk. As a habit we always replaced all caps around drivers and finals but to comply with warranty work we always sourced from Uniden. Is there an EU supplier for these caps? I have a first gen 857 ( not a D model) and it is probably equipped with same trouble makers. It might be worth my time to replace them as a preventative measure. I don't know if that final for the original 857 is available still, if not a ounce of prevention is better than junking the whole unit if that PA fails. A word of wisdom from past experience. Try to clean off as much of that carbon from the board and reseal the area with a high voltage corona dope. That carbon is conductive and can cause some issues. Take care and keep those videos coming!
Thanks for feed back!
Hi, thank you for this very interesting post. I imagined changing an MCU to be much more difficult. I find your approach to error analysis (also in the other videos) super and very instructive! Many thanks for this. vy 73 Andreas, DL5LC
Very neat and clean trouble shooting!!!👍📷
Thank you
Great job Peter. I'm always learning when I watch your videos.
glad that you liked it
Hi Peter. Tnx for another great video. Interesting as always.
Thanks
that is repair... not simply changing parts- that is ecology. GREAT JOB DONE!
Totally agreed! Thank you
Great job as usually dear Peter. I had the same problem with Icom 775's the PA final stage ; I rebuild with new PCB burned zone. As in your case, there was a loss between 13.8 volt and GND traces with a huge current between. I think this can happen with the PCB heat or humidity, I don't know exactly. Best 73s and thanks for sharing. Pasquale IW0HEX
Thanks Paquale. Yes sometimes it is tricky and you never know for 100% what it really caused... Take care my frind
A great repair and carried out very professionally. The test equipment is very interesting also. Super video. Thanks for letting us all look in. 73 de GI8WFA and stay safe.
Thank you
Glad you went ahead and fixed it. That radio is no longer in production and factory repair isn't really an option. 857D is my favorite "swiss army knife" radios of all time. Especially with a wide band collins filter.
great job peter as always
Thank you, Peter. A great repair. NOQFT
Thanks
Well done Peter, a great recovery from a big mess.
Thank you
Nice a very well explained repair as usually peter. Its always a pleasure to have a sunday with one of your funny videos. Thx for your time, always learning something. Many comments and few likes, come on boys!!
Thank you!
Hi Peter it’s good to see your videos again I really definitely enjoy them. And you did a fantastic job on that 857, actually your repair job looks better than the factory I’m very muchly impressed. And how you are able to work with the SMD is phenomenal.
Hello from the Texas hill country.
73
WD5ENH
Steve
Thanks for the kind feed back very much appreciated! Best wishes over to Texas. 73
Amazing Fix !!! Peter you have done it!!!!💎 👈🏻
Thank you
beautiful repair....... you do the repairs the factory would not do , that is why I love your videos . You truly are a master technician . That is a repair I would also attempt myself , though probably not as nice looking as yours hahaha. Many thanks.
Thank you!
Another nice repair. I'm sure those new via's are better then original. That is a great little radio. Ten thumbs up!
Thank you
Great video and excellent repair, many thanks
Very interesting repair Peter. Maybe a high SWR killed that output stage?
Hi Simon, good to see you! The internal SWR bridge does a quite good job to prevent a PA failing by high SWR but trying to match a bad antenna creates sometimes very hight voltages or simply the cap got a crack and starts burning under high voltage..you never now 100%..
Hallo Peter super Video ich suche eine gute Werkstatt für meinen 857d das er wieder Fit bzw abgeglichen wird hättest du eine Adresse für mich
Viele Grüße Thomas DD4ST
Good Job and happy radio owner, better than a surgeon.. i know sometimes it's not easy find a replacement part such as special cap for UHF, maybe a NPO cap can be used. What do you think about "short killer" device for you lab ?! Regards'73 .
Yes you are right getting components is getting more and more critical. Even if you order by the manufacturer it happens that you get a back lock info of 8 month. So happened actually with a Icom IC 7100...
You always do such a great job tracing the event that caused the problem. You never assume a fix.
Thank you
Well done Peter a excellent repair as usual and a great up beat video in plain English 👍 keep the videos coming mate.
Peter super repair Good Job you saved the customer alot of money as Yaesu wouldn't do that repair they would only sell you new board which would cost $700.00 or more maybe suscessful repair well done :)
yeah that is true very pricey to get the board replaced..Thank you
Another interesting repair Peter thanks for the video keep them coming.
Thank you
Remove the screws before unsoldering transistor would help with the heat transfer to the heatsink while removing it. It will save the traces on the board.
As usual an excellent video! I think the repair will be reliable, the PCB feed-through wires are as good as the original setup. Best 73's SEB
Yes fully agreed
Great job once again Peter. It seems you don't need an audio generator at all as you can whistle nearly perfect sine tone ;)
lol okay I have a function generator to sell lol
Another great video, you mentioned free band, I didn’t know you had a VHF allocation for that in Germany de Mike
Yes we have 6 channels witch are free to use without a license limited to 1W HF power. Those channels are very often used by many CB radio operators
Nice job the best repair for a bad situation thanks. Too bad the board could not be re-created with all the technology of today.
I like seeing the innards on these radios. 👍
Once again a nice radio has been safed, good work indeed! I guess the cap shorted out, an the owner could be happy that the short stopped while burning. There was enough material left to give it a try, and you succeeded. Peter, may you plan to collect the charcoal from all the burned radios? You can get a nice diamond if you press it hard enough ;-) Just kidding. Nice video, good work. 73 de Olaf, möge der Sommer endlich kommen!
Thanks Olaf, yes I'm doing this job only to collect enough charcoal to start a diamond production one day lol. Ja nach all dem Regen und Unglück hoffen wir das der Sommer beginnt. Hoffe Du bist verschont geblieben von den Fluten...73
Such a part of the burnt printed circuit board must be cut out with a cutter or dremel and the conductors must be restored. Otherwise, high-frequency voltage will constantly break through here.
Good video. Like.👍
That's a great option. Smoke signals built in.
LOL a special feature
Thanks Peter, great video as always. I don't think my FT-817 has a Smoke Signal mode, at least not what I could find in the menus (which is probably just as well). I'll stick to CW as my lowest common denominator. 73, Jan Henkins - M7HNK
lol yeah let's hope that the feature not suddenly pop up
Again a wonderful video Peter ! Some CB er on 446 PMR ?
Looks like my problem. Now to try and find the p/n for the replacement fuse.
Hello, I was watching this again and was wondering if you have made a video on the FT857 that had lines going through the display ?
I have 2 FT857's and one developed lines through it,,,, if you have done this could you reference the video number ,, Thank you
Ron AC7RH
Great repair Peter.
Another excellent repair Peter, yet another radio saved from an early grave 👍😀.
I would have liked to see the testing of the individual components that were questionable in this video; I know it would make it longer but I think it would also make a better training video, in order to make it more thorough as well, to make it more informative as well.
well the MOS FET was tested dead on the component tester and the burnt cap there was nothing to test anymore...
Nice repair Peter. Thanks for the video.
Thanks for watchig
Great job Peter! Quick question - my radio has the 2SC3102 - should I be concerned with this part, or can I upgrade to the newer FET?
no need to upgrade
I have an 857d thar recently started behaving strangely. The heat sink gets warm while sitting in receive, with a noticable higher noise floor. It was suggested that the PA relay may be stuck closed and there is PA idle current flowing. Is this something youve seen before?
Bravo Peter!!!! Danke!
Thanks for the video. I have learned so much from you. Have you ever fixed the zebra stripes that occur on the 857 display?
Thanks
Just looking at the bench in the background pretty much tells you that this gentleman knows his stuff.
Another good job from Peter…
Thank you
Hey Peter wie immer klasse ;-) wollte einfach mal wieder Tach sagen, biba 73 schönes Wochenend.
Ah schön von dir zu hören! Vielen Dank und ebenfalls schönes Restwochenende! 73
You are right about the factory would not repair this kind of problem. I work on somewhat similar aviation equipment. I could not get away with this kind of repair due to the nature of use. My own stuff I will and have. I knew that something else caused this failure. this is good education for all of us.
Yes agreed and there is something which caused this failure and that was out of band transmission with maximum power...
Maybe the 1st in yrs. that I would have gone one more step .
Grind out the carbonized fiberglass , and then fill in fiberglass powder / epoxy .
I am more of a mechanic , not as much of electronic technician as you ?
Thanks again
Thanks for comment and yes that would be a good idea but since we have a multi layer PCB it is very risky to grind it out. With the new bridge wires installed we have it somewhat solid and from my perspective it is the maximum we can do...
@@TRXLab I would have still filled the crater with epoxy just for the insulation from the burnt fiberglass. I used to repair very high horsepower AC motor drives, I often got in final boards that had burnt spots the size of a nickel . If you didn't clean every last bit of black out of the hole it was guaranteed to come back on you as a warranty repair. I kinda miss that job, one of the few jobs were I got to stay in one place and just work on broken stuff. My training is radio repair in the USAF so anything with RF interests me. Good job getting that final repaired. I would be interested in seeing how long that repair lasts.
Hola Peter, tengo un FT-857D que calienta mucho en VHF & UHF con carga de 50 ohms independientemente de la potencia hay mas de 40 grados centigrados sobre el disipador, V/UHF Idling Current Adjustment seria una solucion? mil gracias!!! exelentes tus videos, saludos LU1DVH
hi Peter nice video and content as usual! IMHO I’m used to recover from bad shape vias or trough hole connection introducing a piece of copper bonding cable for one side to the other one and solder whenever possible the cable on the pads where the via comes out… I don’t know if you really get what I meant due to the poor explanation. By the way I really envy your deep knowledge and expertise! Keep on rocking
Thank you! Off course there are always different possible approaches how to handle a problem and your approach is surly a good one.
Smoke signs ... Great! This is what makes electronics related videos go viral :) :) ... and I instantly had a lol when I saw the big inline fuse on the power cables :) ... there is nothing like safety:)
Now one serious question, why not remove the screws Before applying solder ..it's less thermal mass hence faster soldering ... just saying ...
I think the screws help align the transistor onto the pad. Otherwise the holes might not line up.
Yes what JohnD is saying is quite right you need the screws to align the transistor...
@@TRXLab Of course, but I was referencing the part right at the begginning were you were removing the blown out power mosfet. a simple minor thing really not at all an issue specially because you have great top of the line tools for soldering and desoldering. But I prefer to remove the components with least possible thermal mass around then.
BTW Great Video and you are totally right ... such board can perform for a long time and any brand would classify that board as not possible to repair ...
Well it seems like the right to Repair movement is going Global and getting a lot of traction* ...
* (and yes this last sentence is a pun intended for John Deer farming machines :) ).
@@John_Smith__ Ah okay I see, of course you are right John, but as long I don't feel the pain as the power of my soldering gear is powerful enough one don't think about that.
Mein Gott, das ist wie meine FT857D aber nicht gebratten ! :))) Peter hat noch einmal seine technisches wunder gemacht.
lol oh ich muss dich enttäuschen ich kann keine Wunder... ;-)
i have the same radio .. it still works but i would love to get it fixed by trx bench if it ever broke
Nicely done, good repair ;-))
Thank you
Very nice work Peter, hope your all okey.
Thank you
@22:11 question for you. Would you have taken the time to remove the carbon from under the trace, then epoxy the trace to the undamaged part of the board. I am asking this question as I am watching the video so you might have already answered the question.
It has nothing to with time the issue is we have a multi layer pcb and since we don't have a layer plan we can not easily mill out.
Similar issue. Mine has has lost it's full 50w/20w vhf/uhf output as well but still puts out milliwatts. Had a slight burning smell just prior to failure. Any thoughts? 73
Awesome repair! Are you Belgian, by chance?
Excellent repair video!!!
Thank you
Very very good operation 👍
Thank you
Hello, the RD70HVF1C is specified for 75 W in the datasheet which i would consider to be the effective power. How comes that you can reach 100 W with
the device, is that peak to peak power displayed ?
it 100W on HF in push pull configuration and 50 Watt on vhf/uhf
peters back your the man
superglue the pad down, use a 1mm drill bit to clean the holes in the board
Good Job!
I have one question.
Why you don’t have removed all Carbon residue under the pad ? it is not necessary ?
Since we have a multi layer pcb the risk to kill inner traces is very high...
@@TRXLab multi layer also in RF pcb? O my God… more and more complicated 😓😓😓
Mmmm, BBQ final; so hot the solder melted.
Yeah BBQ lol
11:18 Why off camera when it is tricky? Really don't get that...
very simple the camera is in the way and it is tricky with camera. So I have to do off camera.
Pcs electronics keeps rd70 transistors on stock.
Also...ich als deutschsprachiger freue mich ja das Du so langsam sprichst...so verstehe ich alles.Aber für nen Engländer muss das ja echt gruselig sein....Ich habe mir schon sehr viele Deiner Videos angesehen und bedanke mich auch für dieses recht herzlich
Vielen Dank für die Rückmeldung. Gut das man die Widergabegeschwindigkeit einstellen kann
Fantastic again Peter!
Thanks
I have a FT-857D that I paid $715 for, how can Yaesu charge for one board? Replacing the VIAs with solid wire is standard operating practices. Where is all of the is high Voltages (requiring high Voltage capacitors) coming from? 50 Watts into fifty Ohms in no where near high Voltage. Ron W4BIN
To swap out the board is quite expensive. High voltages coming from reactances since we do not have a real output resistor in ohms. The impedance is a complex resistor which gets critical if you get to resonant points...
Great and clear job!!! 🙂
do you know about a 5 minute delay before you can use the buttons - a seller claims this is factory set this way
No, what is that supposed to be good for?
Great work
Thank you
Thank you
Welcome back Pete
I was always here lol but thank you
My friend how can I get in contact with you
USE FOR SENDING SMOLE SIGNALS ???
What is a smole signal?
yes same question what is SMOLE?
I think the through hole plating on the 12V line to the final could not handle the current. especially if no solder was flowed through the 4 holes. This would cause the "Toastiness" and slow burn. The film capacitor was just there for the hot ride. PooF'