Big thumbs up here Peter. Thanks for taking the time to show this great repair video. Got to love those fusible traces ha ha. Very well explained. Funny you posted this today. Just yesterday the guy from out local rock quarry brought up a Cobra 29. They use them to talk with the truck drivers. Said it blew the fuse when the other guy installed it in a loader. He then installed a 30 amp fuse and radio started smoking. What I found was they used a cheap after market power cable that would actually plug in backwards. When the first fuse blew it shorted the protection diode. When the 30 amp fuse blew it exploded the diode. Taking out the input chokes, circuit trace and audio chip. Guess he learned a lesson. BTW, I always replace the protection diode even if it is not blown. Specially since it has been stressed a bit.Thanks as always for sharing Peter. 73
+The Radio Shop Hi Buddy, man 30A fuse.... but that is exactly what I meant in my video. They don't understand why the fuse always blows and replace a 30A or even no fuse. Your example is a very nice real life report... Yeah agree to replace the diode is good practice! Take care 73
+Mr Carlson's Lab Hi Paul, yes the trace was faster than the diode, that is why it survived hi hi. Very good point to use a Schottky to reduce drop voltage. 10-4 :-)
I like that Rhodes & Shwarz Radio Communication tester. Actually everything on your bench is quite nice! Merry Christmas Peter and thanks for sharing your knowledge and skills with the rest of us who would likely never see such events.🎄
Excellent video as usual. I've lost count of the radios that have crossed my bench for this problem & it doesn't matter how many times you tell an operator not to uprate fuses, they still do it. Stunning workshop the way, always makes me jealous.
Hello Peter, good explaintion and another fine repair job. Years ago i bought a nice TS520S but the transformator was burned out. Found silver paper in the fuseholder. Yes something has to go wrong. See you at your next video best 73, Henk
Good video as usual. Caveat... When the radio is connected backwards, it blows the fuse. This may or may not result is the protection diode failing. If the diode fails it usually fails first to a short. This is why it continues to blow the fuse once the polarity is corrected. The customer returns the dead radio to the manufacture they will determine the radio was connected backwards voiding the warranty. Repeatedly trying to power the radio up after the diode is shorted, whether the reverse polarity is corrected or not, will second result in the diode failing open. Burning the trace is an indication that as you said, the customer bypassed the fuse, or it could also mean the diode was physically shorted and may now be open. The diode should always be replaced, but at least MUST be checked before you return it to the customer. Not replacing a failed open diode will result in damage to the radio if it is connected with the wrong polarity in the future. I will also say... We had a customer that kept blowing the protection diode in a Motorola Astro Spectra. When the radio returned to the Motorola Depot it went to different techs. None of them noticed the repeat failure. I recognized the radio one day in the parts room and researched it. I called the customer to resolve the issue. He was adamant he was not hooking it up with reverse polarity. When I realized he was installing it in a USAF firetruck. I asked if the truck was 24 volts or 48 volts. That was the problem. Over voltage was also blowing the diode.
Great stuff!!!!!!Really enjoy these tutorial type videos. Lots of work for TRXBENCH to do, but I think everyone here really appreciates the effort. Thumbs up again. Great job 73's
Another informative video... thanks Peter. I commonly find that the input protection diodes on CB and UHF CB in Australia are ~16V Zener diodes. Protection against reverse polarity AND against over voltage. Yes... and I have seen the results of using bigger and BIGGER fuses after the diode has failed short circuit. Replaced many burnt tracks and inductors. :-)
Nice job Peter. Glad to see you also use the time tested technician first step troubleshooting technique of slapping the top of the radio. I wondered about the reverse polarity diode configuration - there was another circuit connection that went upwards from the common 12VDC input but couldn't see where it was going (another regulator?). Even though you suffer a slight line voltage drop I think inserting the diode directly in the line is safer; using a Schottky as Paul recommends minimizes that drop and is usually not critical. Can't even count how many times I've sat there staring at a piece of equipment wondering why nothing was happening only to see that I hadn't reconnected the fuse or plugged it into the AC mains. One note for folks - with a service monitor there is no fear of doing any damage by accidentally transmitting into it since it's designed to accept a transmitter's RF output (like Peter's R&S or my IFR) - when testing with a stand alone RF generator I always disconnect the mic from the radio just in case; the front end of your Agilent or R&S signal generator doesn't take kindly to RF power! 73 - Dino KL0S
+Dino Papas Hi Dino, LOL yeah slapping very often helps.. Agree the design is a bit odd... And using a Schottky directly over the power terminal is the right way. Thanks for comment and for valuable note on service monitors and RF generators... 73
Good video...enjoyed it. I can't believe that they put that diode so far away from the power connector! I know it is overkill, but when I "design" circuits and build them, I like to put in a diode bridge using 4 diodes right at the power entry point. That way, though you loose a tiny bit of voltage, the circuitry inside will always be powered up correctly.
Another radio saved from the scrap heap good to see the protection diode was fitted in the wrong part of the circuit well spotted manufacturer mistake and as you said the track was blown which acted like a fuse another success peter :)
Second time I watch the video and liked it so much as the first time. I suppose the extra thickness of the bridge o jumper you installed would allow the fuse to blow in case the power supply polarity were mixed up again. Thanks for sharing.
Wish you had shown how to modify the AM power output. Fifty years ago, when I worked on CB radios in the USA, I believe the regulations said the power limit at the antenna was 4 watts, but the power amplifier output could be as high as 5 watts if required to get 4 at the antenna. So how did you make the change to the Allbrecht to boost from 0.8 watts to 4 watts on AM?
+Gregory West Hi Greg, of course but if you have this fault the first time you need a systematic approach. That is what I wanted to show. This fault is known and I had some of this radios before with the burned traces. The first steps in troubleshooting are always. look, smell, slepp, wiggle :-) Thanks for watching 73
See that all the time. Luckily your traces weren't cooked to bad. Radio design engineers have two problems. One you pointed out, the diode is on the PCB and not mounted directly to the power socket. Second is they seem to use diodes that are to small these days. Even with the correct fuse installed the diodes are so small they burn up before fuse can blow. No doubt the penny pinching bean counters had a hand in that. Mike
awesome , I wonder if connecting a protection diode at the power jack can help if this does happen again (the proper location as you said) to avoid another trace burn .
Yet another case of where the radio blows to protect the fuse! :P I don't like the design very much; the protection diode should adequately rated and connected directly across the power input. I don't think they've thought about it much, there are two inductors in the current path and even the diode anode is connected to ground via a very narrow trace which could blow at less than the fuse rating. Nice repair Peter, and I like that you have the legal specification very much in mind when you are working. I was brought up that way too :)
+Alan Cordwell LOL yes absolutely right Alan, the radio blows to protect the fuse :-) I agree they didn't think much about the design .. Thanks for comment! Cheers
Did you modify the radio and add/move a power protection diode directly onto the power terminal? Would seem like a good idea while the radio is opened up rather than having a trace burn up again in the future, unless there's some reason not to modify it this way.
+Michael Gilchrist Hi Michael, yes your consideration is right in this case I left the diode at the original place as the new wiring is now strong enough to withstand the current. Thanks for watching. 73
Hi Peter great video. It's hard to see from the video. As I am learning more and more I was going to check the IPC-2221 for trace size and expected T rise. What was the trace size roughly in mm (it looks like about 3mm from the video maybe) and fuse size I expect for 4-5W radio I expect would be 5W/(13.8*1.1)= 400-500mA fusing fast blow? In just my current guess 3mm trace is not large enough to handle momentary 150% or so current rating. But now I want to prove I am learning. Thanks!
+Ham4Ham Hi John, yes very close but the transmitter efficiency factor is not 100% it is rather more 40-50% so you need to calculate with 1-1,5A power consumption. That means the fuse is very often 2A. The trace was about 2-3 mm your calculation is right. Good approach. 73
Some times I get a burned land. So I take fine wire and work a new path near the damaged area. Then paint the repair with finger lacquer. To seal out corrosion/ moisture. Gut kino danka. Kv4li.
Good thing it was just a track. I have heard that a $100 transistor will always blow to protect a 10c fuse! A pity we didn't see how you modded the AM transmitter to get up to 4W.
a years ago i was earing of that protection diode, but placed in the middle of the radio? i suposse that could be to work at the same time like a little capacitor, and that's why it's placed there. at high frecuencies...
I really like how your signal modulation analyzer outputs the data so nicely. The combination of the visual and the data is really nice. What brand or software is putting it in that format? I really like that! Does your country still use TV format that has to worry about interference from 27Mhz gear and the harmonics from it? The digital format we use in the USA is not prone to interference like the older format was. Modern TV's have almost no protection in them any more like old tv's had so the new format works out nicely in that regard. If we where still ont he same format we would likely have a lot of issues with the modern tv's. We have do have a lot of idiots that will push modulation fast 100% to 140% to 300%. That said 95%-100% is fairly common even from responsible professional shops with a test tone.
Hello Peter! I was curious what the weakest link was going to be. I thought for a moment about the choke being shorted open, but the trace was the weakest. Thanks...Dan
Would a bridge rectifier solve the problem i.e. the alternating current connections go to the power socket and the negative terminal of the bridge goes to the filter to case and the positive terminal goes the regulator and the protection diode would not be needed because the Bridge Rectifier becomes the protection diode.
What all would be damaged in the case of over voltage from a vehicle with a 24 or 36 volt system is applied to radio or circuit in power supply is open to full voltage not the regulated 13.8 volts it was designed for?
Hi, I am wondering about that capacitor by the diode that's just laid over and has super long leads. That seems like really poor design and/or construction.
GerDay Peter,, I listen (rather than watch, per se) to your videos as well as Mr. Carlson’s as I go about my work in the middle of the Outback of Australia…… signals permitting. I don’t watch (look with my eyes) so I do miss a lot of the nuances, however I’m sure I also absorb more than you would think. Sometimes, when I stop for the night, I’ll actually get to watch, but this is a rarity. Consequently, despite having listened to many, many of your clips, I’ve never before left a comment….. simply because it would be both dangerous and stupid. Likewise, I don’t use a mouse on the fly, so I can’t even “like” the videos. I don’t actually interact with the youtube on the computer at all except before I start driving I select one of your clips and I let RUclips automatically queue and play the next clip …… 99% it will be one of yours or one of Paul’s….. and I just listen as I drive. There are times I wish I was stopped so I can actually watch your accessing the boards etc, but I just glean what I can wth just listening. I’m sure I actually learn a fair bit this way, although I don’t think I’ll be giving up my normal job as a long distance truck driver any time soon to do electronic repairs!!!!!! 😀😀😃😃😄😁🤣 Anyway…. whilst I was getting ready to head off for the week, I thought I would find one of your clips (any one ….and thus just happened to be the one) to express my appreciation and, I guess, to apologise for not liking or commenting…… except I’m NOT sorry for being safe and not risking myself or the native Aussie fauna (not many people to endanger out here!!!!). Thanks again, Peter…… although I seem to recall stumbling on a video where it said either Derrick or Dieter or similar, so that confused me because I swear it sounded like you!!! De VK2XB. - Indy
It's actually a very good design. The decision to design in an additional fuse is very good HI ;) i guess otherwise the radio would have been completely destroyed if the owner had actually bridged the fuse. Would make repair much harder and more expensive. cheers ;) 73s
+ELPRO GSM SERWIS ELEKTRONIKI Hi, yeah funny indeed but this happens very often to this particular radio. It is not my first 6080 with exactly this fault. Thanks for comment 73
I have a Ranger RCI Texas Ranger TR-696FD1 and have voltage to the finals when connected to power source,but when I turn the switch on all power is drained completely. It acts as if a capacitor is shorted to ground,but I have not found the problem. Is it normal for a radio to go dead from being in storage as it was working before it was put in storage and now it will not power on.
+William Colvin Hi William, yes that is a known electrolytic behaviour.... but other than that is is impossible to diagnose over remote.. Sorry for not having a better answer.. 73
Wow what a crap place to put the PD like having your fire extinguishers at the end of the street ! I always replace the diode at the power socket with a higher rated than the radio I don't know why they don't do this at the production line ? Still another good video for the guy starting out !
Ja! Ja! I go to the trash bins, at the truck stops. Und fish out many rigs. Take them home. And fix to my hearts content. Diode is most suspect. Verry little damage to main structure happens. I get quite a few good rigs.
Hi my friend....iam waching all your videos. I' m like much. So how i can the eletronics schemathics. For all radios?? Ow sorry iam training english wich you also. Rsrsrsrsrsrsrs is more easy....!!! Tanks
Big thumbs up here Peter. Thanks for taking the time to show this great repair video. Got to love those fusible traces ha ha. Very well explained. Funny you posted this today. Just yesterday the guy from out local rock quarry brought up a Cobra 29. They use them to talk with the truck drivers. Said it blew the fuse when the other guy installed it in a loader. He then installed a 30 amp fuse and radio started smoking. What I found was they used a cheap after market power cable that would actually plug in backwards. When the first fuse blew it shorted the protection diode. When the 30 amp fuse blew it exploded the diode. Taking out the input chokes, circuit trace and audio chip. Guess he learned a lesson. BTW, I always replace the protection diode even if it is not blown. Specially since it has been stressed a bit.Thanks as always for sharing Peter. 73
+The Radio Shop Hi Buddy, man 30A fuse.... but that is exactly what I meant in my video. They don't understand why the fuse always blows and replace a 30A or even no fuse. Your example is a very nice real life report... Yeah agree to replace the diode is good practice! Take care 73
Good job Peter. Surprised that little diode was still good. When they do pop, I replace them with a Schottky. Crank'n out the big Watts now 10-4 :^)
+Mr Carlson's Lab Hi Paul, yes the trace was faster than the diode, that is why it survived hi hi. Very good point to use a Schottky to reduce drop voltage. 10-4 :-)
Another really good explanation of a radios protection circuit and repair...thanks for another super instruction video.
+charlieoscar09 Hi, no problem, thanks for stopping by! 73
I like that Rhodes & Shwarz Radio Communication tester. Actually everything on your bench is quite nice!
Merry Christmas Peter and thanks for sharing your knowledge and skills with the rest of us who would likely never see such events.🎄
Excellent video as usual. I've lost count of the radios that have crossed my bench for this problem & it doesn't matter how many times you tell an operator not to uprate fuses, they still do it. Stunning workshop the way, always makes me jealous.
+Andy Gallacher Hi Andy, thanks for feed-back. Yeah I can't count either :-) 73
Always a pleasure watching you work... Could watch you and Mr Carlson all day :)
+Jim Moir Hi Jim, glad that you like the videos! Thanks for stopping by 73
Good basic explanation of problems and repair steps taken.
+John Schroeder Hi John, thanks for feed back!
Thank you Peter, nice to see the analyser software in use; thumbs up. Regards Bob (UK)
+Bob Mellor Hi Bob, thanks for stopping by, yes the analyser is working just fine :-) 73
Hello Peter, good explaintion and another fine repair job. Years ago i bought a nice TS520S but the transformator was burned out. Found silver paper in the fuseholder. Yes something has to go wrong. See you at your next video best 73, Henk
+FEY Hi Henk, yeah that is always the same----silver paper ... Thanks for comment! 73
Very well done indeed, Your Diagnosis was absolutely spot on 😃
Thank you for feed-back 73
Good video as usual.
Caveat...
When the radio is connected backwards, it blows the fuse. This may or may not result is the protection diode failing. If the diode fails it usually fails first to a short. This is why it continues to blow the fuse once the polarity is corrected. The customer returns the dead radio to the manufacture they will determine the radio was connected backwards voiding the warranty.
Repeatedly trying to power the radio up after the diode is shorted, whether the reverse polarity is corrected or not, will second result in the diode failing open. Burning the trace is an indication that as you said, the customer bypassed the fuse, or it could also mean the diode was physically shorted and may now be open.
The diode should always be replaced, but at least MUST be checked before you return it to the customer. Not replacing a failed open diode will result in damage to the radio if it is connected with the wrong polarity in the future.
I will also say...
We had a customer that kept blowing the protection diode in a Motorola Astro Spectra. When the radio returned to the Motorola Depot it went to different techs. None of them noticed the repeat failure. I recognized the radio one day in the parts room and researched it. I called the customer to resolve the issue. He was adamant he was not hooking it up with reverse polarity. When I realized he was installing it in a USAF firetruck. I asked if the truck was 24 volts or 48 volts. That was the problem. Over voltage was also blowing the diode.
Great stuff!!!!!!Really enjoy these tutorial type videos. Lots of work for TRXBENCH to do, but I think everyone here really appreciates the effort. Thumbs up again. Great job 73's
+Satellite_Guy Thanks you so much always glad that you like it! Take care 73
trx bench your videos are very informative i always learn a lot from your video's
Thanks for feed back 73
trx...
love the videos, between you and paul carlsons lab.... most impressive sir....kudos!!!
Thank you Jeff! Paul is a great guy. All the best and 73
Another nice repair. Thanks for sharing it with us..
+technos123 Thanks for watching 73
Another informative video... thanks Peter.
I commonly find that the input protection diodes on CB and UHF CB in Australia are ~16V Zener diodes. Protection against reverse polarity AND against over voltage.
Yes... and I have seen the results of using bigger and BIGGER fuses after the diode has failed short circuit. Replaced many burnt tracks and inductors. :-)
+Michael Carey Hi Michael, yes there are definitely more ways to design protection circuits... Thanks for your comment and thanks for watching !
Good diagnostics & repair video again my friend. My eagle eyes saw that vaporised trace at about 8 minutes :)
Cheers Peter
John
+orbiter8 (John) Hello John, yeah best eagle eyes ever :-) Thanks for watching my friend! 73
Nice job Peter. Glad to see you also use the time tested technician first step troubleshooting technique of slapping the top of the radio. I wondered about the reverse polarity diode configuration - there was another circuit connection that went upwards from the common 12VDC input but couldn't see where it was going (another regulator?). Even though you suffer a slight line voltage drop I think inserting the diode directly in the line is safer; using a Schottky as Paul recommends minimizes that drop and is usually not critical.
Can't even count how many times I've sat there staring at a piece of equipment wondering why nothing was happening only to see that I hadn't reconnected the fuse or plugged it into the AC mains. One note for folks - with a service monitor there is no fear of doing any damage by accidentally transmitting into it since it's designed to accept a transmitter's RF output (like Peter's R&S or my IFR) - when testing with a stand alone RF generator I always disconnect the mic from the radio just in case; the front end of your Agilent or R&S signal generator doesn't take kindly to RF power! 73 - Dino KL0S
+Dino Papas Hi Dino, LOL yeah slapping very often helps.. Agree the design is a bit odd... And using a Schottky directly over the power terminal is the right way. Thanks for comment and for valuable note on service monitors and RF generators... 73
Good video...enjoyed it. I can't believe that they put that diode so far away from the power connector! I know it is overkill, but when I "design" circuits and build them, I like to put in a diode bridge using 4 diodes right at the power entry point. That way, though you loose a tiny bit of voltage, the circuitry inside will always be powered up correctly.
Peter thanks for Your videos .... very important source of practical knowledge...... :)
+Giorgio Firpo Hi Giorgio, thanks for your feed-back. I'm glad that you have a use for my videos! 73
and her is to hear the differents between ham operators and cb operators. The Hamoperator knows what he doing.
Great job Peter. Easy job but I always learn so much. Thanks. 73s de Pasquale IW0HEX
+Pasquale IW0HEX Hi Pasquale, always glad to see you here:-) Thanks for watching 73 my friend!
Nice explanation and repair...
Bud...
+budleyca1 Thanks Bud!
Another radio saved from the scrap heap good to see the protection diode was fitted in the wrong part of the circuit well spotted manufacturer mistake and as you said the track was blown which acted like a fuse another success peter :)
Yeah that is the point Thanks for watching 73
Second time I watch the video and liked it so much as the first time. I suppose the extra thickness of the bridge o jumper you installed would allow the fuse to blow in case the power supply polarity were mixed up again. Thanks for sharing.
Thank you Juan, glad that you like it so much! 73
Great video well explained
thanks Peter
+DENNIS N Hi Dennis, always glad to see you here. Thanks for comment!
Nice video, Peter. Thanks.
+Robert Calk Jr. Thanks Robert!
Wish you had shown how to modify the AM power output. Fifty years ago, when I worked on CB radios in the USA, I believe the regulations said the power limit at the antenna was 4 watts, but the power amplifier output could be as high as 5 watts if required to get 4 at the antenna. So how did you make the change to the Allbrecht to boost from 0.8 watts to 4 watts on AM?
Nice video Peter, A good eye ball inspection first would have seen the burn't trace? Keep them comming. Greg
+Gregory West Hi Greg, of course but if you have this fault the first time you need a systematic approach. That is what I wanted to show. This fault is known and I had some of this radios before with the burned traces. The first steps in troubleshooting are always. look, smell, slepp, wiggle :-)
Thanks for watching 73
Excellent video. Thanks.
+jerry blood Thank you jerry!
Another excellent video!
+Mitchell Smith (KB3GKC) Thank you Mitchell 73
See that all the time. Luckily your traces weren't cooked to bad. Radio design engineers have two problems. One you pointed out, the diode is on the PCB and not mounted directly to the power socket. Second is they seem to use diodes that are to small these days. Even with the correct fuse installed the diodes are so small they burn up before fuse can blow. No doubt the penny pinching bean counters had a hand in that.
Mike
+MikesRadioRepair .CBRadio Hi Mike, yeah you are completely right! Thanks for comment. 73
awesome , I wonder if connecting a protection diode at the power jack can help if this does happen again (the proper location as you said) to avoid another trace burn .
+danny blackhorse Hi Danny, if the diode would have been over the power terminal we would not have the destroyed trace.. Thanks for watching 73
Yet another case of where the radio blows to protect the fuse! :P I don't like the design very much; the protection diode should adequately rated and connected directly across the power input. I don't think they've thought about it much, there are two inductors in the current path and even the diode anode is connected to ground via a very narrow trace which could blow at less than the fuse rating. Nice repair Peter, and I like that you have the legal specification very much in mind when you are working. I was brought up that way too :)
+Alan Cordwell LOL yes absolutely right Alan, the radio blows to protect the fuse :-) I agree they didn't think much about the design .. Thanks for comment! Cheers
Great repair Peter :)
+Grant Fullen Thanks Grant! 73
Did you modify the radio and add/move a power protection diode directly onto the power terminal? Would seem like a good idea while the radio is opened up rather than having a trace burn up again in the future, unless there's some reason not to modify it this way.
+Michael Gilchrist Hi Michael, yes your consideration is right in this case I left the diode at the original place as the new wiring is now strong enough to withstand the current. Thanks for watching. 73
For protection..Using small relay and a little diode put in spoll on it more reliable and saver also no drop voltage.
Hi Peter great video. It's hard to see from the video. As I am learning more and more I was going to check the IPC-2221 for trace size and expected T rise. What was the trace size roughly in mm (it looks like about 3mm from the video maybe) and fuse size I expect for 4-5W radio I expect would be 5W/(13.8*1.1)= 400-500mA fusing fast blow? In just my current guess 3mm trace is not large enough to handle momentary 150% or so current rating. But now I want to prove I am learning. Thanks!
+Ham4Ham Hi John, yes very close but the transmitter efficiency factor is not 100% it is rather more 40-50% so you need to calculate with 1-1,5A power consumption. That means the fuse is very often 2A. The trace was about 2-3 mm your calculation is right. Good approach. 73
Some times I get a burned land. So I take fine wire and work a new path near the damaged area. Then paint the repair with finger lacquer. To seal out corrosion/ moisture. Gut kino danka. Kv4li.
Good thing it was just a track. I have heard that a $100 transistor will always blow to protect a 10c fuse!
A pity we didn't see how you modded the AM transmitter to get up to 4W.
LOL yeah sometimes it is funny 73
Well done Peter!!!
Question: what is the spectrum analyzer software you are using??
+Vladimir Petrovic Hi Vladimir, thanks for watching. Watch my video #77 for all needed information about the Signal Hound spectrum analyzer.
+TRXBench
Peter, Many thanks!!!
a years ago i was earing of that protection diode, but placed in the middle of the radio? i suposse that could be to work at the same time like a little capacitor, and that's why it's placed there. at high frecuencies...
Hi Fede, thanks for watching, well the Diode is simply placed at the wrong place. Very bad design. 73's
I really like how your signal modulation analyzer outputs the data so nicely. The combination of the visual and the data is really nice. What brand or software is putting it in that format? I really like that!
Does your country still use TV format that has to worry about interference from 27Mhz gear and the harmonics from it? The digital format we use in the USA is not prone to interference like the older format was. Modern TV's have almost no protection in them any more like old tv's had so the new format works out nicely in that regard. If we where still ont he same format we would likely have a lot of issues with the modern tv's.
We have do have a lot of idiots that will push modulation fast 100% to 140% to 300%. That said 95%-100% is fairly common even from responsible professional shops with a test tone.
Hi, thanks for watching! The analyzer is a SignalHound simply watch video #77 there are all information needed.. 73
Hello Peter! I was curious what the weakest link was going to be. I thought for a moment about the choke being shorted open, but the trace was the weakest. Thanks...Dan
+Beretta96Dan Hello Dan, yes sometimes the chokes are burned as well. Thanks for watching rgds Peter
Would a bridge rectifier solve the problem i.e. the alternating current connections go to the power socket and the negative terminal of the bridge goes to the filter to case and the positive terminal goes the regulator and the protection diode would not be needed because the Bridge Rectifier becomes the protection diode.
Yes it would solve the problem but the voltage drop would already influence your output power especially if you only have 4 Watt output power... 73
What all would be damaged in the case of over voltage from a vehicle with a 24 or 36 volt system is applied to radio or circuit in power supply is open to full voltage not the regulated 13.8 volts it was designed for?
Hi William, very hard to say you never can predict it 100% but we can say it is always a serious issue..Thanks for stopping by 73
Thank you very much.
Hi,
I am wondering about that capacitor by the diode that's just laid over and has super long leads. That seems like really poor design and/or construction.
+David Hi David, yes really poor construction . Thanks for comment. 73
GerDay Peter,,
I listen (rather than watch, per se) to your videos as well as Mr. Carlson’s as I go about my work in the middle of the Outback of Australia…… signals permitting. I don’t watch (look with my eyes) so I do miss a lot of the nuances, however I’m sure I also absorb more than you would think. Sometimes, when I stop for the night, I’ll actually get to watch, but this is a rarity. Consequently, despite having listened to many, many of your clips, I’ve never before left a comment….. simply because it would be both dangerous and stupid. Likewise, I don’t use a mouse on the fly, so I can’t even “like” the videos.
I don’t actually interact with the youtube on the computer at all except before I start driving I select one of your clips and I let RUclips automatically queue and play the next clip …… 99% it will be one of yours or one of Paul’s….. and I just listen as I drive. There are times I wish I was stopped so I can actually watch your accessing the boards etc, but I just glean what I can wth just listening.
I’m sure I actually learn a fair bit this way, although I don’t think I’ll be giving up my normal job as a long distance truck driver any time soon to do electronic repairs!!!!!! 😀😀😃😃😄😁🤣
Anyway…. whilst I was getting ready to head off for the week, I thought I would find one of your clips (any one ….and thus just happened to be the one) to express my appreciation and, I guess, to apologise for not liking or commenting…… except I’m NOT sorry for being safe and not risking myself or the native Aussie fauna (not many people to endanger out here!!!!).
Thanks again, Peter…… although I seem to recall stumbling on a video where it said either Derrick or Dieter or similar, so that confused me because I swear it sounded like you!!!
De VK2XB. - Indy
Thank you Indy for your feed back very much appreciated and a save journey all times
It's actually a very good design. The decision to design in an additional fuse is very good HI ;) i guess otherwise the radio would have been completely destroyed if the owner had actually bridged the fuse. Would make repair much harder and more expensive. cheers ;) 73s
Yeah, that's it :-) Thanks for watching 73
Funny situation, because a few days ago I repaired the same radio with the same damage. Best regards, SQ3HTA
+ELPRO GSM SERWIS ELEKTRONIKI Hi, yeah funny indeed but this happens very often to this particular radio. It is not my first 6080 with exactly this fault. Thanks for comment 73
I have a Ranger RCI Texas Ranger TR-696FD1 and have voltage to the finals when connected to power source,but when I turn the switch on all power is drained completely. It acts as if a capacitor is shorted to ground,but I have not found the problem. Is it normal for a radio to go dead from being in storage as it was working before it was put in storage and now it will not power on.
+William Colvin Hi William, yes that is a known electrolytic behaviour.... but other than that is is impossible to diagnose over remote.. Sorry for not having a better answer.. 73
Problem was in the driver and final.
Wow what a crap place to put the PD like having your fire extinguishers at the end of the street !
I always replace the diode at the power socket with a higher rated than the radio I don't know why they don't do this at the production line ?
Still another good video for the guy starting out !
+Sam W Hi Sam, yes I 100% agree.. Thanks for stopping by . All the best and 73
All ways a pleasure watching you videos 73 m0srw
Had this a fair few times , usually tho because the diode was near the input power , it had fried the diode as well .
+Chipz0r Hi, yes that happens all the time.. thanks for feed-back 73
very good job ;) 73 de PY7DJ
+DJ Caverna Haroldo Bradaschia Neto Hi Neto, thank you! 73
Ja! Ja! I go to the trash bins, at the truck stops. Und fish out many rigs. Take them home. And fix to my hearts content. Diode is most suspect. Verry little damage to main structure happens. I get quite a few good rigs.
Я понимаю каждое слово его английского. Автор явно наш! Петя, покажи им как Теслу собрать, пусть не позорятся.
Hi my friend....iam waching all your videos. I' m like much.
So how i can the eletronics schemathics. For all radios??
Ow sorry iam training english wich you also.
Rsrsrsrsrsrsrs is more easy....!!!
Tanks
like your work! what a lousy board design! could have been worse!
+su pyrow Hi, thanks for feed-back! 73
Often the radio blows, followed by the operator....so you need 2 fuses for both...hahahahah
OM F G! I fell asleep before you checked the fuse. Ummm yea...
good work, junk radio
+Capt Larry - Thanks Larry, yes junk radio :-)