#266

#radiorepair, #icom, #radio lab

[@dondonaldson1684]

Love the techniques and the troubleshooting. When you were doing the audio, I noticed the Motorola MC3357P that I used to sell in the 80's when I worked for Motorola Semiconductor. It was a staple in radios as a linear narrow band FM IF. The date code made me chuckle as it was 8440 which means that the manufactured date was the 40th work week of 1984. That radio was likely built in late 84 or early 85, right when Motorola Semiconductor was entering into product allocations out of their Linear/Analog products group in Mesa, Arizona. Oh my, fond memories! Great to see bat wing IC's still ticking 40 years later. Electrolytics...cant count how many I had replaced when I worked as an RF engineer at Motorola Communication Division in the early 80's before moving over to Mot Semi. Your point about restoration is spot on. Changing out each and every electrolytic is time-consuming, but not a lot of skill is needed. However, patience is a must. Cheers, VE3NAP

[@MrKelendros]

Great repair peter, those old radios can hage funny behaviour after the time. A weekend is always better when we have the opportunity to enjoy a video from you. Thx!

[@lyntonprescott3412]

Well done Peter. Outstanding work. Lynton G4XCQ

[@bblod4896]

Forty year old power supply caps dry out. Open them up, they get waxy and smell unique. Thermal cameras are great for finding the shorted capacitors. Glad you were able to resurrect that old radio. Thanks for the Saturday video Peter.

[@dondonaldson1684]

The "unique smell" is something that you never forget.

[@JoeHamRadioGuy]

Wow lots of stuff in that radio, nice to have the correct tools to find the problem. Probably a good idea for the customer to have all them old caps changed. Great job Peter love your work.

[@M0XFXUK]

Another great video Peter. I have never seen two electrolytic caps go short in the same radio but as you say the radio is 40 yeas old and I guess that these things are going to happen at this age. I really like your distinction between restoration and repair as it's so true and if I'm honest I hadn't really thought of it like that. I can only imagine how time consuming it would be to recap the complete radio but like you say for the radio to be reliable this would need to be done. Hope you are well and best regards from the UK.

[@TRXLab]

Hi John, thanks for stepping by.. Yes, restoration is something which will block your bench for a too long time. Most of the time, there are additional issues to fix along the way. That all makes it impossible to calculate with. It is always open end and a lot of trouble with a non-satisfied customer. With other words, it is always high risk to work on stuff older than 15 years...Take care mate

[@albertvanduren1693]

Thanks for the excellent video, Peter. I admire your perseverance and your demonstration of the novel use of the FLIR camera. 73 from Al Van Duren, AE0JT in Minnesota, USA.

[@lgroves336]

Peter is a wizard ! at 40 yrs old the clock is running on the other capacitors.

[@vk2kyp]

Hi Thanks for a great video Peter. I have a IC-471H which I have had since new. Due to moving house a few times it has not been used much. I checked the Ram battery back up, still OK, I replaced the battery a few years ago. Powering the IC-471H up and there is a short circuit on the 13.8 volt rail. So far found 2 x 470 uF short circuit Rubycon Electroytics. Until watching your video I had not seen Electros go short circuit. Thanks again Gary vk2kyp

[@trifonaskonstantatos8422]

Hi Peter.Thanks for the excellent trouble shooting lesson.

[@pasqualeiw0hex95]

Great video Peter; in this repairs there is need to change all capacitors but I know that it's a huge job ! But I appreciated too much your patience to do this job ! Well done Peter, best 73 de IW0HEX Pasquale.

[@hectorpascal]

LOL! For me printing, cutting and reassembling ICR7000 and ICR71 schematics from 6 or 7 pages was NOT the greatest fun I have ever had! Many scanners/printers subtly distort the images and reconnecting lines needs some care. But once done, the work was well worthwhile. I recommend taping cut pages together with mylar tape like 3M Scotch Magic tape - it is "seethru" and lasts "forever" without degrading. Once reassembled, careful concertina folding A4 size and storage in a plastic sleeve leaves the regenerated schematic ready for the next time!

[@richardcook4643]

Great video Peter. It was fun to see the TI tool in action. I use nothing but panasonic 105 degree electrolytic caps, even though there are other good brands. Thanks for your time and video. 73

[@tomnorman5461]

Another excellent repair video Peter, glad you were able to resurrect that old rig....for at least a little more operational life. Recapping would take a lot of time, and not be cost effective...unless parts & labor were free.

[@GarthWheeler]

Thanks Peter I just been restoring a yeast ft726R I put new capacitors in and a new display. Working like a new radio. Thanks for the video. Definitely Garth zs5gmw

[@fredshead3956]

Well done Peter, brilliant...seems like the old capacitors are giving a lot of trouble...

[@ot7e]

Another great video Peter I really enjoy your videos. Thanks for the great content, I look forward to your next troubleshooting.

[@fpaynejr]

"Oh yeah 💩 it is really hot!" 😂 Love your repair videos, have helped me with my own thought process approaching repairs. Keep up the good work!

[@stargazer7644]

7:57 just open it twice in two windows and position the two pages side by side, or snap each page and paste them both in a drawing program. Only takes a moment.

[@gi4sjq240]

Another excellent video. Great use for a thermal imaging camera. Thats been a real good learning exercise. Thank you Peter 🙂

[@konradkubit6525]

Another great repair Peter

[@morseoneuk]

fantastic, methodical, logical fault finding. thanks for the great content . I look forward to your next adventure.

[@sherwooddefense7914]

I've been watching your channel for quite some time and you demonstrated the usefulness of an IR camera. How useful that would have been when I first got into radio! I love those old radios and the fact that you CAN work on them. Touché on the problems of getting old obsolete parts and all the counterfeit stuff out there you get from China. I really enjoy your channel as it bolsters how all problem solving flows. I used to also live in Bremen once upon a time while stationed in Germany with the U.S. Army. Keep up your videos. I have learned so much just watching. The equipment available for reasonable price these days is really amazing. I wish I had access to that stuff years ago when I first started to work on radios back in 1990. I probably have $5000 invested in my lab right now but in 1990 the same equipment would have been $50k!

[@TRXLab]

Fully agreed! Thanks for watching!

[@Joe_KS1I]

Hey Peter, I felt your frustration after that deep sigh after replacing the first capacitor.... also that IR camera is a real nice tool to have.

[@IZ0MTW]

It’s truly a nice case study as you said. Thank you for sharing your knowledge and experience with the community. 73s Diego

[@PaulReedy]

Great video, I really want to get a flir camera, sure is handy in situations like this. I’ve re-capped mine, but also there are variable capacitors used for alignment, which are plastic, and those should be replaced with ceramic ones, unfortunately those are getting harder to find. I have a 271H just like this one, which I love. My only issue at the moment is when you change from fm to ssb, there’s a voltage that is supposed to change from 1.5 or so to 3v. That is not happening, which is causing my ssb frequency to be 2khz off. I haven’t been able to track down the logic issue, so I just tune 2kc higher. Also, don’t forget to replace the meter bulb, as it looks like this one has burnt out. Looks to be in great shape otherwise.

[@TRXLab]

check vco

[@chickennugget3362]

Really enjoy your videos Pete. Thanks for giving up your time to do this. Ive learned so much!

[@hancecrawford]

Peter trust you are well thank you for an educational video so much learning

[@TRXLab]

Thank you, John!

[@hancecrawford]

Peter it is a joy to watch an engineer at work that thermal camera is a great asset looking for hotspot on PCB and componates which overheat

[@davidniemi4051]

Thank you Peter, that IR camera really helps with diagnosis.

[@regularuser492]

Unsere Radio Artzt ist am werk ! Wie immer was gutes kommt von Peter. Danke dir !

[@w.rustylane5650]

Once again, another great video. You sure are fast at finding the fault. Methodical steps to a final conclusion with exceptional skills at finding the fault. I definitely admire your strait forward method of trouble shooting. I had no idea that an infrared (thermal) camera would show so much about a circuit, that little bastard of a shorted cap. Way to go, Peter; another old timer radio lives once again. Cheers & 73 from W Rusty Lane K9POW in eastern Tennessee

[@TRXLab]

Thanks, Rusty! Yes the IR cam is of a great help..

[@pixeluser175]

Thank you again for this very satisfying and calming video! At April 1st, I was expecting a loud explosion at the end though!

[@8du]

Yep, and I was setting on the edge of my chair. Thanks for the video once again. Peter.

[@ipklondonuk]

Well that was certainly a challenge, I would have given up after 15 minutes, great work

[@lespaul886]

A fantastic video Peter I really enjoyed it I really love the way you find the faults ,I really hope this old girl get the love she needs ...Keep up the good work

[@mikefinn2101]

Hi Peter this was a real great video repair and real treat to learn about issues you could have the Icom 271 is a great radio worth fixing or restoration. Sure really loved this video I have radios just like this one and feel better now if I have an issue I know where to start. Really appreciate your time doing these videos since I really learned so much .

[@TKomoski]

Another tool in the tool box to fight those nasty repairs. That camera found those faulty componets fast, i'm sure it will come in handy again. *Cheers* *73*

[@TRXLab]

not too bad to use the cam...

[@jimwolsiffer4397]

Great lesson!

[@georgebodley8068]

I have an old Kenwood radio but it's always wise to keep the service/circuit manual in case it needs repair which helps Repairers like yourself hopefully .all my Radio manuals have circuit diagrams and are kept in case of such situations

[@rscelectrical7091]

Another one bite's the dust. Great video Peter, thank you.

[@dennisqwertyuiop]

great work again,,,,thank you

[@marcelojuliopaixao]

Thanks for another great class and also for the great diction, I am not fluent in English.

[@towerman75]

I had a 471H once that suffered from the same thing. I did not repair it, due to the cost, but if Icom had not made it such a beautiful radio to look at, it wouldn't have been such a hard decision not to repair it.

[@boxingday11]

Thanks Peter.👍🏻

[@charliem.9998]

I'm with you on every video ... Peter has an incredible expertise ... hats off ... 73s de DL6RDE/AA1KD, Charlie

[@TRXLab]

Thank you Charlie!

[@PapasDino]

Nice work Peter...you've convinced me now to finally pull the trigger on a new thermal camera which I was considering this week, nice coincidence! 73 - Dino KLØS

[@TRXLab]

Yes the IR cam is of a great help.

[@TheDefpom]

It’s always a crapacitor

[@sherwooddefense7914]

sometimes it's a diode.... people do silly stuff

[@TRXLab]

Yes, it is Scott :-)

[@marvinwatson3245]

I cannot believe you swore, the "bastard" capacitor.. haha.

[@TKomoski]

Lol me to haha

[@stargazer7644]

I'm not sure "bastard" is swearing, but he also said "Shit it is really hot" at 17:00 lol.

[@TRXLab]

lol I see you like my stuff :-)

[@JxH]

My Yaesu FT-77 (bought used 2006) was made circa 1982-86, so ~40 years old. Still works 'perfectly' *, although I very recently bought a brand new modern rig. * No internal failures evident, works fine. Pure luck...

[@Thujaplicata1]

Hello Peter, You have a very careful, methodical approach to troubleshooting. I used to work in a TV repair shop many years ago, I really like this kind of work! This is the first video of yours I have watched and I really enjoyed it. I am a Ham as well, and love this old equipment! I am subscribing to your channel :-) Take it easy, and we will look forward to seeing more videos from you. All the best sir!

[@TRXLab]

Welcome to the channel. Have fun

[@ve99online]

Hallo Peter, wieder eine saubere und analytische Fehlersuche. Mit diesen China Angeboten gebe ich dir vollkommen recht. Selbst wenn Transistoren oder IC funktionieren, ist die SOA dieser China Nachbauten meist weit unter den Bereichen der Original Bauelemente. Gerade bei Leistungstransistoren ist daher wieder mit schnellen Ausfällen zu rechnen. 73, Jörg

[@TRXLab]

Danke fürs Vorbeischauen, Jörg! Ja, leider die Bauteilversorgung aus China ist eher suboptimal...73 Peter

[@orangmakan]

Had fun watching that, thanks.

[@TheDefpom]

I’m pretty sure I have some MB3756 sitting in my parts drawers, used in some old CB’s too

[@TRXLab]

My stocks are all gone....

[@13ig13oots]

Nice call on the thermal camera, Alex of NorthridgeFix uses one to great effect.

[@bblod4896]

Better than factory 😊

[@claudio6493]

Grazie Peter! Another success! bloody cheap capacitors!

[@jackofalltrades3727]

You are the best

[@ouijim]

Another eye opening adventure. Thank You. I "was" looking to buy ICOM IC-271H but now maybe not. Love old radios but not interested in restoration project. Already have couple old Ten-Tec radios with dirty contacts that I need to clean. I prefer to "operate" new radios with spectrum display. I am still drawn to old equipment like a moth to flame : (

[@TRXLab]

If you want old radios your hobby must be restoration projects, otherwise it makes no sens...

[@ouijim]

@@TRXLab I have an old ICOM IC-751 which I've own since decades, only upgraded with PIEXX Memory Board. Also Ten-Tec Argosy II still working fine. Ten-Tec Titan II has dirty pots. Mostly I use modern radios.

[@dickvancampen3318]

Outstanding 4 amps thats a life but its a sturdy transceiver. A complete recap would be good but alote off work a lover would do that.

[@nielspDK]

Hi , Thangs for the video , I get a icom ic -1271 soon , Thing I also have to replace the caps

[@jerrypeal653]

Very nice . 👍

[@Alberto_Alletto]

Similar problem on my Icom 751. But in my case the cap not was completly shorted but the coil was partially burned. This problem caused noise in the speaker during transmission

[@TRXLab]

check vco

[@NinoSaelectronics]

Hello Peter .. congratulations, beautiful video as always .. I would like to ask you , I don't know if someone has already asked you, the model and brand of the infrared camera .. Thanks.

[@Swataia]

Nice job with cutting some time using that thermal camera. I think I need to buy one of those myself. I like 80's radios and have four big transceivers and plan to recap them soon. I know what you mean with restauration... It's a lot of work and have to be done by the owner or a good friend for sure to cut the cost. And it's also a job where you can do some harm if you don't do it well. Peter, have you had any real change in alignment when the radio has been recapped? Electrolytic caps are not a precicion devices anyway so I wonder do they make a lot of difference to alignment...

[@JxH]

"Nice job with cutting some time using that thermal camera." For low voltage circuits, a cheaper temperature-probing option will (quite literally) already be 'on hand': your fingers. Of course, common sense caution required. Quick palm taps to start...

[@TRXLab]

Unfortunately, it would not work all times. The coil could be found with a finger if it is not burnt out until you'll find it. The caps don't get so hot that your finger will find it easily...

[@dirkr7891]

Nice 2m allmode

[@charlesk999]

I recently repaired an IC-271H. The main problem was the oscillator at 10.75 MHz below frequency not starting up reliably or dropping out. I replaced most components in that part including the 6 pF trimmer. Also replaced a number of capacitors in the more critical locations. It is now far more reliable, but not totally. It can run for days then it appears to lose PLL lock as the green LED goes out. Tuning backwards and forwards it can drop in and out. To some extent it seems to be temperature dependent. More reliable when warm. Any suggestions?

[@aureliobelloiz8egm627]

Good jobs old capacitors are always bad thinngs

[@KD0CAC]

Peter , it occurred to during this video - to ask you call sign , I wanted to check my log to see if you are in my log ? ;) If it is ok with you , no big deal either way Thanks again

[@AlexCausey]

😃👍👍👍

[@andybonneau9209]

I have this exact radio. I really need to replace all of the capacitors. Just not looking forward to it.

[@docokd7oco443]

I guess I'll have to take your word that your continuity check beeps. I own several cheap and expensive ones that claim to beep. I have yet to one time hear one. Everyone else in the room swears it beeps. Right, sure it does.

[@FUNKLABOR_DL1LEP]

Well I would try to cut the chems by Photoshop or Gimp and put them togeteher in one sheet, but yes. It takes time.. 😢

[@TRXLab]

Yeah, that is the point, it takes too long. Otherwise, good idea...

[@vk2wgw]

At 4:59 the 8 pin plug is disconnected, just saying.

[@itsonlyme9938]

It might be a bad batch of 470uf caps that got put in ??

[@TRXLab]

Well, most likely simply very old....

[@rickyn420]

petter can I get information where I can send my radio to you . Thanks

[@frankbaron1608]

what mmodel is that bench multimeter you use? its display is really clear

[@stargazer7644]

The orange one is an Agilent U1272A.

[@frankbaron1608]

@@stargazer7644 tno, the bench one that kept saying "open"

[@stargazer7644]

@@frankbaron1608 That's a Siglent SDM3045X 4.5 digit digital multimeter.

[@frankbaron1608]

@@stargazer7644 thank you

[@user-cc5hx1ys2y]

Как регулируется мощность в этом транссивере ?

[@jkbish1]

cleaver trick.

[@rickyn420]

hello I am looking for someone to work on my icom 751a . if u do can I get info where to send. THANK YOU.

[@felixmsrtin]

Have a defective 271E laying around. As soon as I switch it on the frequency on the display begins running up . Anyone an idea . Already cleaned the encoder and he isnt the cause. :-(

[@Gorantp]

Mechanically check the S14 Scan button on the EF board, may be broken. If not, follow the lead of the Y0 to the Logic board. As a test, lift one leg of the D12 on the Logic board to see if scan stops. Unplug the mic to eliminate up/down buttons mailfunction. Check Q2 on the Logic board. Check Page 5.12 Chapter 5.4.7 & 5.4.8 of the Service manual. Good luck.

[@felixmsrtin]

@@Gorantp many thanks for the hints , i ll do so !!

[@WolfgangS]

Really ?

[@stargazer7644]

Really !

[@TRXLab]

Really? What?

[@WolfgangS]

@@TRXLab Du benutzt das Wort Recht häufig, das ist witzig. Aber danke für deine Filme, die sind toll :)

[@freemind9734]

@@WolfgangS Right!