Big Thumbs up that 1.67 Volt lead you a merry dance that faulty diode it was very interesting fault finding lesson those type of faults can lead you crazy :)
I love the fact that you’re willing to make a long video showing us your steps one after the next I really feel like I learned a lot. Please never feel tempted to cut the video short.
Hi Peter great troubleshooting! This is a first for me normally a diode is either good or open. Very interesting problem and glad the old girl is back working.
This was a fun one. I was guessing ahead of you, my first one was a transistor, and you went to that, then the IC test, when I saw the voltage still there my guess was a diode. I'm getting better watching you. You are a good teacher, very detailed.
Another great video Peter, I really like the way you troubleshoot these radios. What a lot a lot of people don't appreciate is that the fault finding can can be the most time consuming part of repairing equipment and as you demonstrated some faults are hard work to find. I would never have guessed it was a leaking diode but through a process of elimination there it was. keep up the good work mate..
Thank you John, your positive view on my work is very much appreciated! Always admired your professional work as well! And you are right, many people don't understand that changing a part is not the job, it is more over what it takes to find the problem. That is knowledge, experience and time. Take care mate !
BEAUTIFUL JOB. I AM PY1JW AND I AM ELECTRICAL ENGINEER SR WAS VERY DETAILED AND VERY DIDACTIC PLEASE, CONTINUE SO, GOD BLESS YOU AND YOU GIVE HEALTH TO PRODUCE MORE VIDEOS LIKE THIS . LUIZ
WOW Peter that was a great troubleshooting video. I love your technique and how you analyze the circuits. I have learned so much from you. Please keep making these videos where you go through an analysis of the circuit to find the fault. Thanks again. John C
Before watching the troubleshooting, my guess is a relay that is supposed to change the radio back to receive mode as soon as the PTT key or other transmit command signal ceases. Edit: I was correct about the relay not functioning properly, but my analysis didn't go deep enough regarding why it was not. Just a 15-cent diode! What a great teaching video!
wow, another nice walk through the magical land of electronics. I followed this with a lot of interest. Thank you for taking us on this journey full of thoughts that led to the solution of the problem. thank you.
Peter, this video is awesome. I loved the way you took us through the troubleshooting process systematically (as it should be). Can't wait to see the next one. Thanks.
Hi Peter, another great systematic troubleshot. Congratulation. Looking forward to see you tackling with Sony ICF-PRO 80 with its aging issues mostly dried/leaky electrolytic smd capacitors. Greetings from The Hague
Well, on this sunday morning it was worth 2 cups of tea spending my time to this great toubleshooting, Peter. Fine work and investigation as expected. As Buddy said, big thumbs up for this HQ video! BTW, i also have an alert from Buddy, so lets find out whats new over there ;-)
Congratulations Peter for that fault finding and fixing the problem. 10 peneth of diode that could have caused so much more damage in many Pounds worth of other faults. Just about has bad as a faulty 10p. Electrolytic capacitor. Well done Peter. 73 de John - G0WXU.
2:07 I suspect the TX/RX switching relay or it's area. Some transistor may be? (at this time you had not tested with antenna tuner on..). Anyway I will seat comfortably and see if my suspition is true. Jsjs.. This Piter's video promises much entertainment and knowledges. :-) Great radio, great technician ! (I know that radio shall be repaired). Thumb up now. Cheers from Spain, Peter.
Yes it was long. But very educational. I Thought T/R switch, but I see you must dig deeper to find those pesky diodes that leak. Very well done and presented!
I could not think ahead of you at all on this one. thinking back, knowing the one diode is the front end that first gets hit, and goes bad, and it suffering, hits the next diode right beside it, one would think, looking near the one always going bad, start there first. but this looked nothing like that. good work peter. I thought it was the chip till you pulled that leg.
Nice one Peter, i first put my money on the TX relay, was sure that i "hanged" after tx, but after seeing the 1.6v, and reset after power off....i was looking at my schematics thinking ..what on earth can cause this .. possibly the rx/tx switch transistor...but nope??....and i followed along with you with great interest... never seen that diode break down before - nice repair :-):-) 73´s / Anders
Peter, long video, but you really could NOT have made it shorter, vital steps would have been missed out... Excellent fault finding as usual and it was quite exciting all the way through, like a TV detective story !! I bet you had a good sleep the night you finished this repair! Best regards as always, 73, Brian EI8EJB
16:00 I also understand the TX/RX conmmutation relay of that radio is a critical point due to how that area was projected. The fault of that component could cause that when we press TX switch (MOX or PTT) all the RF power coming from PA unit enters directly to the front-end, bandpass filter and other RX areas causing a disaster. Please Peter, correct me if I'm wrong. (And sorry for my bad english)
Im glad I found your channel, it really helps. Do you have any experience with a Marconi 2019A signal generator? Im thinking about getting one to help with fault finding.
@@TRXLab , thanks for the reply. I'll get one if I find it at a good price. I already have a Marconi microwave frequency sweeper and Automatic Amplitude Analyzer and they have been good, and still use them often.
Keying transistor is bad or leaking to keep the radio from going back into receive, could be transistor or a leaking diode. or the switching transistor to the relay is staying on on the transmit section of the amplifier. Or it could go all the way back to the processor. Need to trace the circuit all the way back from the relay all the way to the first breakdown voltage is not taken away from the relay. Or you could have checked the keying section of the relay and found out why that power was still going to the relay that should have been shut off by the diode for receive. The exact problem was that the keying transistor was getting power when it was supposed to be in receive and followed it back from there.
Thanks for feed-back. Well not easy with a book for its own.. It is really a lot to learn. What you need is a good mentor a lot of time and patience..Sorry for not having an easier answer.
Thanks Peter for your reply. We really don't have CB repair guys here in our country. I am an Electronic repair Technical and I repair all sorts of stuff. What I really need to know is the basic of how to set up the radio for repairs like do I need to have the antenna hooked up the the radio before turning it on and what are the set up steps... Things like that. The trouble shooting part I can handle. Please let me know.
Im glad I found your channel, it really helps. Do you have any experience with a Marconi 2019A signal generator? Im thinking about getting one to help with fault finding.
