#129

[@KevinModz65]

I know this is old but excellent catch, and thank you for taking the time to post stuff like this. I learn from you

[@waynecarlson3736]

Buddy I love it when you work on Kenwoods. Always great to learn something new Thank You

[@TheRadioShop]

Thanks Wayne. These model radios can be a challenge.

[@kg2ix]

Thank you for opening up that relay so we can see how it works. I have always known the theory behind its operation, but I have never seen it in action, or what the mechanism actually looks like. Thank you so much, 73, kg2ix

[@TheRadioShop]

Thanks you for watching. Glad I could help.

[@rickj2913]

Love the way you show and teach . Thanks so much .

[@TheDefpom]

At 33:05 minutes when you are working on the broken trace, I think I can see another broken trace, on the right, the ones that go horizontal and curve to go vertical, just to the right of your hand, the top one has a mark on it like a cracked trace which has arced or corroded slightly, it might be nothing, but you may want to double check.

[@TheRadioShop]

I see where you are talking about. It is either glue or old flux. Wiped right off :)

[@stanleygerrick6053]

Great video again! Love your trouble shooting and repair videos especially of HF radios. Keep them coming please! Also love your calm and relaxing manner and your wonderful accent. It's great to see you methodical diagnosing and fixing problems. Dr. Stan KZ8G

[@TheRadioShop]

Thank you so much Dr. Stan for those kind words. It is really great to hear comments like these. Radio repair is a passion to me. I enjoy sharing my simple thought process so others can follow along. Glad you like the videos. 73

[@TRXLab]

Nice walk through Buddy. Thanks for sharing 73

[@TheRadioShop]

Hi Peter. Thanks for stopping in. 73

[@rico1319]

Another great fix, don't know what specialized training you had or schooling but you do a fine job with a lot of patients and steady hands. Keep up the good work and thanks for sharing these videos!! I really enjoy watching you troubleshoot and fix these projects.

[@TheRadioShop]

Thanks Rico. As far as training and schooling in electronics, I have had none. I started when I was about 11 years old. Lived on a farm so there was not much by the way of training. Read every electronic magazine I could get my hands on. So I am self taught in the art of electronics.

[@anselb2000]

I always find your videos amazing. A great many should aspire to have your abilities!

[@TheRadioShop]

Thank you very much for the positive comment. Someone said in video #128 my accent was annoying lol.

[@waynecarlson3736]

As you stated before you started on a 520 as I also did and still have a few. I also have a TS940s will bring back out someday. Great vid Thank You

[@wayner-model5880]

You, Sir, are a Wizard. Truly enjoy watching you work. and wave your magic wand.

[@TheRadioShop]

Thanks you

[@oldnormanbates]

Nice work,I love listening to your Troubleshooting Skills.. Gives me a good flashback to my days,but on Ham Radio Transceivers rather than Commercial (other stuff) Equipment. Very detailed,more than anything else I've found on the Gear I now have at my 67yr old age. N7PB Paul Bates

[@TheRadioShop]

Thanks for sharing Paul

[@daveleisman4441]

This is an outstanding series. I just wish I had your background and experience to track down the problems as you have - without complete;y decimating the radio as a part of the process. Keep 'em coming!

[@Pyridox]

Good video. You are correct about doing a good visual inspection first, it could lead you in the right direction.

[@TheRadioShop]

Thanks Pete.

[@vernonmarris6076]

Another great trace and track, you make it look so easy... My only question is. After re soldering that track, why was the pad & pin of the resister still moving when you put the meter probe on to test continuity?

[@TheRadioShop]

Yep, after the video I had to go back and fix it again.

[@theradiomechanic9625]

Nice repair Buddy, I keep telling folks that the best piece if test gear is between the ears. Look, smell, touch.

[@theradiomechanic9625]

That is, piece OF test gear. Gotta watch what I type.

[@TheRadioShop]

Well said my friend. You are 100 % correct.

[@dougmcartin3881]

Enjoyed the double feature tonight Buddy. Always a treat. 73 Doug.

[@TheRadioShop]

Enjoyed having you watching.

[@mr.fantomas7726]

I'm watching too, very excited.

[@danishnative9555]

Good job mate. This model is a beast to have to work on.

[@danluzurriaga6035]

But it is not SMD. Compared to any SMD, it is easy to work on.

[@izzzzzz6]

U gotta love it when a plan comes together.

[@careycraig4360]

VERY GOOD INDEED! This was VERY EDUCATIONAL. A Great Live as it happens approach to a real problem. I particularly was glad to see the "EQUIPMENT" both Large and Small that you are using to work on this Printed Circuit Board with ( the Tweezer Set ) for example and the Type of Soldering / De Soldering Equipment. Proper Knowledge and Proper Equipment a bit of Luck thrown in and you have what everybody wants " SUCCESS" . I will certainly be watching your other Videos.

[@TheRadioShop]

Thank you very much for the kind words. Glad you enjoyed it.

[@bundylovess]

Grate repair buddy as always big thumbs up

[@TheRadioShop]

Thank you allan

[@toolstimber5953]

Thanks for a great video. I just took my -940S out from the storage locker. It had been unused for some 25 years. It seem to have issue with the back up batteries, the meter is not showing voltage, frequency display shows readings but goes off after a a few seconds but returns when u rotate the knob. Reception is next to none... something might have happened when I switched it on for the 1st time. AVR board gives 28,5 V. The USB , LSB buttons do not illuminate. I wish I could find a circuit diagram and board component layouts, but maybe the best would be to get some radio specialist help...

[@danluzurriaga6035]

Wow, 25 years. Begin with replacing all electrolytic capacitors. Hopefully there are no wax capacitors lol.

[@Beretta96Dan]

Nice fix, Buddy. I have two 940s, so I always like to see repair videos of that radio. 73...Dan w4mnc

[@TheRadioShop]

Thanks Dan. Not a lot of repair videos on these rigs.

[@ronlouis3011]

Very relaxing to watch you work Buddy. I was a little confused by the schematic around those relays, however. Could not figure out the RX RF flow through those relays on the schematic.

[@aaa000777]

The Relays are there to insert RF attenuation into the receive circuit. One provides 10 db attenuation and the other provides 20 db. If both are activated you get 30 db. The schematic had an error in it where one leg of R3 was not connected to anything.

[@cuban9splat]

I too noticed the trace you fixed move when you put the probe on it at 34:35. It was making good connection but could it cause future problems? I used to have a Kenwood TS-930 that I dearly loved until she finally gave up the ghost. I wish I had known about your skills back then. That TS-930 had an awesome receiver, especially for CW. Another great video, Buddy. Thank you. 73 DE K7RMJ Frank

[@TheRadioShop]

Yes that solder bridge was not the main fix. Was just to get the radio tested and work out the problems. If you look at that area of the board in the video you will see quite a few pads with cracks around them. I think I spent 2 hours so far tiding up traces on this unit. Thanks for watching. Yes the 930 had a great receiver.

[@mikesradiorepair]

Luckily it didn't get any further than the attenuator resistors. These can be a real pita to repair depending how deep the problem gets as your aware. I have two of these. One that works great and one that has developed a dot display problem until it warms up. Servicing the top boards that are stacked can be a bit of a pain. Hoping it's nothing more than a poor connection since the problem goes away when it warms up. Really need to dig that radio out one of these days and repair it. LOL, ever notice us repair guys always seem to have the most broken radios. Always to busy repairing everyone else's. :-)

[@TheRadioShop]

I will admit these radios are a PITA to start with. They seem so fragile to work on. Always scared you are going to break something. He was lucky on this one. Looks like the arrester took the brunt and saved a lot of parts. I was so surprised that Q10 did not get wiped. It is a FET preamp. Luckly it was installed backwards from the factory. I also know what you mean. I have plenty of broken rigs in need of repair. Just no time. I bet I got 25 emails in the past two weeks wanting me to get back to the 101 series. Customer rigs first......

[@Beretta96Dan]

The cobbler's kids have no shoes .Lol!

[@patrickbaer7902]

The Radio Shop thank you radio shop very informative that you make it look easy and I know it's not he has sometimes my 940 the audio just cuts back to about 1/3 and then it will come back but then the meter will be anyway I guess you know what I mean maybe I'm thinking and said neon bulb in mind cuz sometimes when I tap it it comes back up I don't know anyway very informative I'll let you know if I ever get to see no part right now it's just a paperweight on my desk glad I found this KZbin video thank you very much what state are you in by the way I am in Central Florida KSI for l u

[@patrickbaer7902]

The Radio Shop I have a ts-940 go slow the volume control and it will come back sometime then the meter will be like S9 noise and then I go down to like S2 but it's intermittent and I thought maybe the volume control was dirty it's weird sometimes I'll push the monitor button and the volume will come up now it's doing it where I turned the attenuation on and the receive gets louder I don't know I may have to check that neon Bob you're talking about but mine is definitely intermittent

[@The411]

I know I'm 3 years late... but @34:33 the resistor pin is moving. The pad at the break is lifted off the board.

[@philt7003]

I saw that too.

[@gravestonemyth]

Excellent work, though I desperately wanted to reach for your ohmmeter and see the resistance on the relay before and after cleaning.

[@rlmillr]

Not that it would have affected the repair, I was curious at 2:00 it shows 1KHz @ 1KHz deviation. That seems like awfully low modulation. I would have thought it should be 4 KHz deviation. It served the purpose but curiosity got the best of me :) Love your videos.

[@TheRadioShop]

Yep, It amazes me that folks like yourself can spot the little things. :) I was keeping the tone a bit low because it was the signal I was interested in, the tone was just for a marker. With only 60% hearing in one ear I can tell more about what is going on in the transmitter by concentrating on the carrier. Now if this would had been a by the book alignment then everything would be set according. Thanks for paying attention.

[@paulmemmer3260]

Could you please give a start up tutorial to show a recent ham re-tread how to turn on the TS-940S and get it up and running? I have recently gotten my general license after years off the air. Thank you

[@gonebamboo4116]

Congratulations on your new ticket

[@jwrtiger]

Very nice video, enjoyed watching you work.

[@TheRadioShop]

Thank you

[@paublusamericanus292]

good job buddy. lucky for uncle he had the bulb on the input lead.

[@kev-the-windsurfer.]

Do RF they said, it will be fun they said!! They didn't tell me about the lightning damage that could occur....I'm sure this one got off pretty lightly.....another top video, looks like this model of radio could be a bit tricky if you had to get much further into it....thanks again for the great video!!

[@TheRadioShop]

Thanks Kevin. I know what you mean lol. Yes this design can be a bit tricky to work with. So many boards and cables to cause issues. Thanks for watching.

[@brettmiller5443]

Nice work!!!

[@michelfries1429]

How do you remove wax in these rigs? Hairdryer and tilting the rig downside? Thank you for the tip

[@TheRadioShop]

I put the rig on it's side and use my hot air gun to melt the wax. But a hair dryer should do the trick.

[@michelfries1429]

I followed your advise and had a nice result! PLL issue solved but have now the right part of every qrg digits turned on and low rx sensitivity. Keep on working!

[@mibarfa]

It was a great help for me, many thanks TI2YO

[@robertbidot3238]

Nice repair!

[@hash5760]

thanks , great video but i think that last PCB trace u fixed , it appeared that the resistor leg still moves and looks flimsy , it might go loose due to temperature changes or vibration , u can see it at 34:35 moving as u put the probe of the DMM , i would suggest reinforcing it with a piece of wire i wanted to let u know regards

[@harbselectronicslab3551]

Yep it looked a bit ordinary.....I think a piece of tinned wire and glue might be in order.

[@TheRadioShop]

Yes you are correct. Good eye. After the testing is done I did a proper repair of the trace. I do not use wire to fix traces on high end radios. I cut copper traces and attach to the board. Then I apply over coat to the exposed trace. Now nothing at all wrong with using wire to repair a trace.

[@987kestrel]

A few questions for you Buddy. Are those special bulbs they use for that fuse circuit? Could I use those same bulbs or a similar setup for my own homebrew protection circuit?

[@TheRadioShop]

I will pull the part number and check but I do believe they are 250 volt neons. And yes they would help in a homebrew rig.

[@danluzurriaga6035]

@@TheRadioShop That is not a fuse circuit, as Jack says, it is a gas discharge device to protect against overvoltage at the antenna input, correct? A fuse is a short circuit but the bulb is an open circuit. But interesting: they just use a common neon gas bulb and not some special device. Looks like it didn't protect those two resistors lol.

[@IamDerick]

Your senses are basic test gear, minus taste (could get messy). ;) Great video. :)

[@TheRadioShop]

LOL, loved that one. Thanks

[@1southsoon]

After 30 years in the business I have never seen a solder sucker that worked so well. What brand/ model is it? 73

[@TheRadioShop]

It is an older Pace unit. Some of the best equipment at the time.

[@Robalo844]

good job. can you tell me if you know the replacement part for D5: BZ-192 19v 1 watt zener diode this is for the PA. I have 2 ts-940s and ts-930s with the same problem.

[@TheRadioShop]

I will look into it. Just got home from a long day. Give me a couple of days to see what they are. If I do not reply back please mail me.

[@petegkSalonika]

Good work sir ,73's from europe Greece

[@TheRadioShop]

Thank you very much

[@YU5KBM]

O was recaping the PLL unit and got the same exact issue resolved the PLL for IC8 by removing the wax and resoldering but still the same and noticed that I am missing 5V on Carier board. Having issues tracing the wire it might be that something else was disconnected or getting pulled to gnd. Was there any update on this I see it hass been a long while back.

[@rickj2913]

Very helpful . Thanks

[@DonDegidio]

Hi Buddy, Another fine repair video. I doubt you would be able to affix that resistor trace back onto the pcb. 73 WB3BJU

[@TheRadioShop]

Thanks Donald. See video #19 on how I properly repair traces. There is actually a lot of repair that needs to be done to this board.

[@ojjenkins7110]

NICE JOB ON THE TS940S BUDDY. VISION, SO I USE CAPS LOCK. THINKING ABOUT DIGGING INTO MY IFR1200S. SEEMS TO HAVE THE SAME THING WRONG YOURS DID. $200 GRRRR, BUT IT WAS A FREEBIE ALONG WITH A PAIR OF MOTOROLA R1200A'S THAT ALL WERE ON THE WAY TO DUMPSTERS SOME YEARS AGO. THEY FULLY WORK BUT THE IFR ONLY HAS WEAK GEN LIKE YOURS DID . RECEIVE IS FINE.. OJ KØOJ

[@TheRadioShop]

Thanks OJ. Know what you mean about the vision. That is a expensive little part. I have to order one soon my self. let us know how yours go. Thanks for watching.

[@daveborchard2019]

I've got the same trouble with the Kenwood TS-940, where the ATT -20 position is the same as the zero position, where it should be between the -10 and -30 attenuation. I haven't opened the bottom of the radio yet. The TS-940 also has many other problems. The frequency was unstable. CW sounded chirpy on CW and SSB was garbled. Cleaning the molex connectors on the PLL board fixed most of the chirpy CW, but I still heard the chirp one time after cleaning the connecters with deoxIT. Maybe the PLL and Career boards need to be re-soldered. What's your source for the relays? I think it would be a good idea to replace them. I also have intermittent display problems with the alternating digits and dots. Most of the time that problem doesn't occur. Maybe cleaning more molex connections and re-soldering the boards will fix the intermittent problems. The radio wasn't used for about 20 years. Your videos are very helpful! I've thought about junking my TS-940, but maybe it can be repaired. KY0L.

[@martinhernandez9417]

hello radio shop guy nice video, i have the same problem with my 940 trans, and I'm wondering where can i find the relays?thanks

[@1112223333111]

if you google, Q10 and Q4 are installed backwards from the factory. fixing this improves RX

[@1112223333111]

I just finished q10 and q4 and it made a huge improvement. signals that were +20 are not pegging the needle, I had to recalibrate s9

[@TheRadioShop]

I have made this conversion to quite a few of them. Going to show it on the 2nd one I am working on. There has been a couple in the past where it did not make any gain at all. but most do.

[@1112223333111]

yes interesting. this may be before or after kenwood changed R149 and R150. Appartently they are labeled wrong on the board and later Kenwood fixed it. web.archive.org/web/20111115011437/homepages.ihug.co.nz:80/~jaking/TS-940_02.htm#_Toc155846452

[@MrJr669]

great video i have the kenwood TS- 940s

[@A10Jedi]

In the beginning the green screen showed blocks. At the end it displayed characters. What did you do to fix it?

[@julianjames4519]

In the first test with signal, AGC switch is in OFF position. Then the S meter is not activated, therefore you should not expect the pointer to deviate from input signal. In this situation, the movement of the pointer is subordinate only to RF gain.

[@TheRadioShop]

You are correct.

[@n8tuwstevenewland933]

Q: just had one of these given to me. Had a couple things to fix. But on the clock. Are there any light bulbs to light the clock ?

[@michelfries1429]

Wise advise! Nice shot again! All seems sometimes so easy but it's not. Don't be too humble!

[@TheRadioShop]

Thanks. It was not that bad.

[@Fraiyia]

I have low receive on my kenwood 430. It’s going on the bench soon.

[@TheRadioShop]

Cool Veronicca. Please let us know what you find and how it turns out. Thanks

[@Fraiyia]

The Radio Shop I believe I have dirty relays and some bad caps . . I can put on say 3553 kHz on vfo A and then put on 820 kHz on VFO B and flip between the VFO s . This seems to snap the relays on and off and my imagining is that it is cutting through some of the carbon build up. Cuz the signals gets better and I can pull in most am stations for a while .I would switch to solid state relays if I could . The VFOs seem on track- I compared the frequencies with my Grundig satellit and they match up dead on..,

[@kirkgeahlen5532]

19:00......HEY,I DIDN'T COME HERE TO TALK ABOUT THE WEATHER!!!!!Seriously tho,last couple of days I've been watching some of your Kenwood vids as I was considering a 480 or 940 as my first Ham rig,as both are for sale here on CL,and I wanted a feel as to what some problems they have being they are fairly old now,and after watching both you and MikesRadioRepair,you BOTH have gained new subs,Great job to you both for taking time to video,share,and EXPLAIN what you are doing.My only regret is that your #18 video was supposed to be a Part 1,and I never saw a Part 2? ;-(

[@TheRadioShop]

Thanks Kirk for the nice comment. The 480 is a very nice reliable radio. The 930/940 is a great radio when they are working. Kenwood created a lot of failure points in this rig with connectors and PLL issues. Google 940 pll problems and you will see what I mean. I never did a part 2 of video 18 because once I started working on this radio I found more problems that one would want. Not only are the PLL's dead but both final amplifiers are toast. Transistors and support components. Hope one day to find another one and use parts from that one to make a good one. Thanks again for watching.

[@danluzurriaga6035]

@@TheRadioShop I love it; 930/940 are great radios when they are working. LOL.

[@sidwallace3489]

I am brand brand new to this and want to explore buying a receiver like this. Would you suggest this one as a good start or something different? And what exactly can it pick up? Are there other frequencies I should explore. This says low receiver - no idea what that is or what it means. Could you explain? Thank you!

[@sionnachog894]

Very interesting, very well-done video, great skills shown. It's a birds nest to me but not to a guy like you who knows what he is doing!

[@TheRadioShop]

Thank you for the very kind words.

[@gonebamboo4116]

Amazing

[@PapasDino]

Great job Buddy! My TS-940S watched along side me and knows if it ever gets sick it may have to go visit "Uncle Buddy"! ;-) 73 - Dino KL0S

[@TheRadioShop]

LOL, Lets just hope it does not decide to take you up on that soon. When these rigs work they work great, and when they break............. They can challenge many techs, Thanks for watching old friend. I hope yours lives long and prosper.

[@maninthevan53]

well done

[@TheRadioShop]

Thanks

[@Gw0wvl]

On your Sig Gen you say " To stop the ??? From expiring " ..... Can you say that again as I just didn't catch it ..... Thanks .

[@tracypilon5530]

do you do repairs for your viewers i have a 940 with problems

[@HORACIO8945]

Hola amigos, mi TS940S, tiene problemas al encender(POWER), queda el display en forma intermitente,sin indicar la frecuencia de trabajo, ademas no tiene recepcion ni transmision. gracias.73 lu1hj

[@lampa2001]

Hola oscar ponte en contacto conmigo y lo discutimos. Tengo 2 ts940 y ya recorro el manual service de memoria

[@HORACIO8945]

@@lampa2001 Hola Jorge buenas tardes por Villa C.Paz Argentina, bueno agradezco su gentileza en haber respondido a mi pregunta, dado que fue hace un tiempo recien reviso mis correos ,y veo su repuesta.Bueno le comento que ahora enciende todo, pero no maca en el intrumento , la parte de IC,VC,ALC,..y ademas tiene poca potencia en casi todas las bandas, tambien el procesador no funciona. Le comunico que emite pero con baja potencia.Podria inormarme de que Pais es usted.gracias.Atte.Oscar

[@bennockley]

Buddy!!!, As Always, You Never cease to AMAZE!!, Me :-), I Miss Your Steady Hand and Eyesight, I wish I still Had them?? ;-) :-):-), getting Ready to TRY AND DO A RECAP, on that model, If I Lived Next Door, I'd Be One of Your Customers, As Always I enjoyed, Your Expertise, Cheers from Downunder, Mate ;-)

[@TheRadioShop]

Thanks for that nice comment. Hands are still steady but there is pain. Eyes started failing years ago but I still manage with the help of magnifiers lol.

[@RashidAGani-he6sn]

❤..tnx

[@martinhernandez9417]

hello buddy, I'i sent u an email also a reply on a question about the relays i hope u found the time to reply, i know how busy u must be, but if u do knw where i can get those components ? plz let me know? thank u sir. 73,s have a good day

[@chrishays4835]

I ought to send you my TS-940 for a check up

[@rayk5uzz317]

PLEASE DO VIDEO ON THE TS-930 HOW TO GET FULL POWER ON AM 11MFIXED INTERMITTING ON FINAL BOARD TURNED C642 AROUND ON AUDIO TURN VFO SLOW FREQ. DOE'S NOT CHANGE THE FASTER U TURN IT CHANGE MAYBE SOME THINGS U DO MAY HELP ME LOVE YOUR VIDEO'S THANKS GOLDDUST IN MS.

[@rickgunther7328]

That,s the kind of repars i like ricks radio shop

[@TheRadioShop]

Thanks Rick. Glad you liked it.

[@joeredd3867]

Did he want the generator on FM?

[@rickj2913]

I use paper money wetted with contact cleaner .

[@macp8854]

The ATTN resistors are in OHMS and NOT K-OHMS.

[@batman4e]

No offense, but I have been taught to repair the track by soldering a copper wire. Using only solder will not last that long.

[@TheRadioShop]

No offence taken. You have been taught correct. However I do not use just plain solder. I use silver solder. The trace will break before the silver solder does. But in all honesty the correct way is to replace the trace as I have shown in other videos. Thanks for your comment.

[@danishnative9555]

I agree. That's how I would do it, with some 24-26awg. It's not as elegant looking but very reliable. Everybody has there own way of doing things. Silver solder (95/5) is pretty darn rugged.

[@mr.fantomas7726]

Have You got a one Transceiver Yaesu FT-ONE?

[@TheRadioShop]

That is one I do not own...Yet

[@ulrichhensel8171]

😀👍

[@mr1enrollment]

Buddy: the PCB repair was not the best. Review the video you can see the pad move when you checked after soldering. IMHO this is a spot for later problems. I would have added a piece of wire. The fundamental problem is likely that the PCB is fragile to rework. Use of the Pace tool is important - but still damage can happen, especially with the older PCB technology. They are notably fragile. 73

[@TheRadioShop]

Daniel, you are correct. someone pointed that out when I first posted the video four years ago. The problem was corrected

[@mr1enrollment]

excellent, I did search but did not read all comments. cheers

[@AF6LJSue]

:)

[@TheRadioShop]

:-)

[@joeredd3867]

It's not 100K it's 100Ω

[@paulwerz5122]

did it all nothing changed