This is truly a fascinating side of electronics , and reading the schematic road map, once you got to the 100 ohm resistor, capacitors jumped out at me, I'm sure a lot learned from this video, I'veI done this a 1000, times over 45 years, but still love to watch you working.
Again, amazing step by step troubleshooting with excellent commentary.It brings me back to my college years when we first learned to use test equipment. I have to say I watched almost with the same intensity as watching a suspense movie on tv.. trying to guess ahead of you as to what to look for, and what you'd see for measurements. Amazing use of block, schematic and component drawings.. I'd love to spend a year along your side to even learn a fraction of your expertise.
A superb educational presentation that I see everyone here likes and appreciates. I myself gained a lot of insight into the trouble-shooting process. We are just fortunate to have someone like this fellow to guide and inspire us in the electronics art. I surely hope we see more of these as I look forward to these videos by this guy. A big thumbs up to this one!!!!!
I've watched a lot of troubleshooting videos over the past weeks, this is by far the best. Thank you so much for taking the time and effort to film this, I know it wasn't easy. Thank you, thank you, thank you.
I fixed many hr2510 and lincolns over the years and found that Q125, Q127 and Q136 are the most common fault causing this sympthom. I have never seen the OP Amp failing when the tx/rx switching problem is present. Shorted caps droping the 8v line supply are common like C110 and the bad caps found in your video. Is very easy to find the faulty part begining from J302 8V (TX contol from CPU/PLL board) and follow it until the 8V drop. Good video and great troubleshoot process.
Very good work. You got me with this one Peter, I was thinking the voltage regulator, and not a short. So I found a new technique by working towards the regulator. I hope you are well my friend and hope to see you back one day. 73 from Arizona USA.
This is an amazing video, thanks so much for posting such videos. Thanks to Internet and youtube and knowledgeable and kind people like you, these kinds of tacit knowledge can be transmitted to people around the world. 73
One of the best I've seen. Thanks for the detail, too many others I see don't show the details and details are exactly what we need to see. Thanks so much.
Thank you for this video. My elderly uncle passed one of these radios to me with similar problems. I've enjoyed getting it working again with the help of this video!
I enjoy the way you take your time and explain everything in detail. Thank you, I am learning so much from you. You are a very skilled electronic technician.
Troubleshooting for dummies; excellent. Very much appreciate your thorough step by step process and thought process. I have watched your 4 part balun series which too is excellent, especially part 3 where you explain the basics of the math behind 4:1 and its clear how it relates to the winding.
Amazing video very informative your ability to explain and describe can make even a novice understand. Keep up the good work look forward to seeing all your videos and learning in the process
My retirement hobby is the repair of early vacuum tube radios. I am now interested in learning to repair more modern solid state radio equipment, so I study and enjoy learning from you and wish to thank you for your excellent video. Some of the equipment that I work on is 60+ years old, the modern components have changed but what is still true is the measurements and rational reasoning involved in the repair procedure to both old and modern radio. Thank you for your excellent work, you are a very good teacher. Malcolm KB1QCJ
Every minuet of this video is golden. Brings back memories of the time when I bought my 2830. All those years ago. When I still had hair!! Klasse. Dankeschon Peter.
Super video. Very clear and methodical. A teaching moment for me. I am new to the hobby and frustrated at my ignorance. You helped me in developing a plan when approaching repairs.
Awesome troubleshooting tutorial! Very well described all the way through. I’ve been fixing consumer electronics for about 25 years, but not so much transceivers. I was following with you with baited breath, couldn’t wait to touch the probes myself, lol. Very good explanation of how to breakdown the components through data sheet research to get a detailed understanding of function, as well as pinout of leads. Your description as how to locate components was also well explained, as well as how transistors of type npn and pnp are turned on by a high or low bias at their respective base leads. I was expecting the 100 ohm resistor to be open, or the IC supply pin to be shorted internally and pulling the 8v down. In which isolating its supply pin by unsoldering would lift the short (loading) and bring back the 8v showing the problem to be the IC. However the shorted cap ended up being the bad guy pulling the 8v to ground low. Note: I hate schematic that don’t show connection without at dot or a jump, sometimes this can confuse a person as to what trace is connected to what else. Awesome job, I felt excited like I fixed the radio along side of you! BTW, I love all of your expensive testing equipment, maybe Santa will be good to me this year like he has been to you in past, lol. 🙂👍
Just finished watching this video. Outstanding. You were very thorough with your explanations. Almost every time I thought of a question about what you were doing, you answered it! Maybe at some point, you could compile a list of your preferred sources for schematics and component data sheets. Thanks so much for taking the time to do this video!
+Mitchell Smith (KB3GKC) Hi Mitchell, thanks for comment and kind words! Well to be honest there is no list of preferred sources. I always use one of the known search engines to find the best result. That's it...73 and again thanks for stopping by!
I very much enjoyed your video and learned lots from it. I've a similar tx problem on another radio. I will now use it as a roadmap for my own repair project. Thanks and 73's
Really nice video, learning so much from your videos. No problem by the time taken to explain. Looking forward for more videos. Sorry for the other negative comments. seems that they really don't recognize the importance of basic troubleshooting.
This was an AWESOME video! Thank you for taking the time to record and narrate it. Very informative, I will pass it on to our local Ham Radio Club members. 73's KE0EYH
Really enjoyable to watch, your care and detail you took in the faultfinding was fascinating; seeing the schematic the first thing I suspected were the decoupling capacitors, but will heed your more methodical approach after many a time getting it wrong myself by using a 'blunderbuss' approach to repairs.
Excellent video and I learned something new - that electrolytics can fail short as well as the usual open, and good tip using resistor to spot where the short is. Thank you also for making this video in English.
Hi Peter, ok thank you yes it all makes sense, I don't have the radio anymore I sold it some time ago on ebay, but I was always curious about it...snowing here this morning, first snow we have had this year...look forward to more of your videos...Fred.
awesome video, I have a BS in electrical engineering and I am a Extra Class Ham (KK4EDE) and I have zero troubleshoot abilities, I could design a transmitter easier then fixing one, trouble shooting is really an art form, great job and I hope you do more of these type videos... the thought process that one goes through is more than half the battle.
Michael Katt Hi Michael, thanks for your feed back! It is really essential to have good service manuals, otherwise you are lost. I really would appreciate that vendors put more focus on documentation. That should really be a key selling argument!
Hello ! Electrolytic capacitors are the shortest life components in electronics and therefor they are usually responsible for most of the problems. That is why some technicians replace all of them in equipment over 10 or 12 years old. These CB models are over 20 years old, most of them, so they are ready for capacitor replacement ! Good job, you seem to be a good technician ( and with a very nice bench). Keep up the good work and the nice videos.
Hi TRXBench Sorry to say that you are completely wrong about needing a electronics background!, I am a complete novice but having watched your videos and with your amazing tutorial on this video and others, I was able to fix my President Lincoln which didn't even have the same fault. Keep up the great work!!!!! I would give you a million thumbs up if I could. Justin
Justin Shears Hi Justin, okay in this case I'm okay with being wrong :-) Great that you have a use of my videos! Thanks for your feed-back. best 73 Peter
Nice video! It is more helping build my confidence and reinforcing what I should already know. Oh good, a SIP8 4558 dual op amp. That is as Japanese as they come! Roland Boss used to implement those with Roland house numbers hoping no one could fix their products. DIP8 4558s are as common as sea gulls on a garbage scow. . Cheers, happy Christmas, and 73s, KI7AQJ.
Wonderful! I believe I would need a brain transplant to be any thing like you in trouble shooting but it is good to learn to capacity any way. Thanks KI7RJS
Hello Carlos, the best way to test modulation is apply a sample of the mic audio to the horizontal input of a scope and an RF sample to the vertical. The resulting trapezoid pattern will reveal not only modulation percentage, but also distortion, noise, hum flat-topping etc. And for SSB use the pattern to adjust the balanced modulator for minimum residual carrier. K4OF.
Do U know what are u doing, an impossible work, u don't know English well like me even though u r trying to explain deeply, that is amazing, I mean amazing, I'm so exited, plz keep it up.With a lot of love n thanx.Cheers.
