And thank you for demonstrating what a cold solder looks like. I've skipped over connections that looked like you showed thinking they were good. Super educational man!
Awesome finally an old Kenwood video! They are so affordable that more and more people are getting them and it's great when Mike does them so we can learn how to troubleshoot. These and the early hybrids are fantastic radios to document here!
TS-940s restoration. Power output on all but the 160 meter band, was unsure. I unplug the PA and hook to a load and meter and I got power. Then hooked to out of low pass, no out on 160. Started clicking through the bands, used a flashlight on relays, sure enough one relay not moving. Found an open coil winding in relay. So when key up all power reflected back, lucky no damage. Since this low pass has its directional coupler for SWR after the low pass, radio had no idea it was destroying itself. Love the videos. Sorry I rant a lot.
I bought a used TS140S in 1989 and I still use it today. It had the MARS/CAP modification so it will transmit just about anywhere, but I never use it out of band. The guy I bought it from had a MARS permit so I know he used it for that. He also had CB19 programmed into one of the memories so he was probably on there a lot too. The rig still works pretty well, except the fan doesn't seem to come on anymore. Not sure if the fan needs to be replaced or something else. Thanks for doing this interesting video.
Thank you! I had no xmit but partial receive on 40m and suspected the relays. Found cold solder joints as you did and followed your advice. Works like a champ again! Thank you! 73 de WB2SMK
One of my favorite radios. Easy to use and easy to work on. Should have never sold mine after 14 years. I miss it. Good advise on how to re-solder those relays Mike. I completely agree. Only down fall with these rigs are those slide switches. Thanks for sharing.
Hi buddy. I was gonna ask you what you thought of this rig. Those slide switches are stupid but have you heard of any other complaints? Thanks. Richard Wilson
Other than the slide switches these are great units. I had mine for years and never a failure with it. I would love to own one again. Had good audio and strong signal. Easy to operate. Only complaint I can think of is folks using them on another service and blowing the finals out. Other than that, great radios.
Great job Mike. I picked this radio at the Ft. Wayne Hamfest about 3 years ago. You're right about the ease of access. I added a filter for CW and a digital input for computer. Military guys make a mod to transmit on mil frequencies, (actually any frequencies). I know there's a trick to broadcasting on AM but it will broadcast at 40 watts or less. My power cord looks vaguely similar. weird. Thanks for the video.
Definitely, B Blod... the fuse is hero in that part of the story... it blew before the PA transistors could get hot enough to go super-critical and detonate. :-)
Fantastic Mike, I do have one of this Radio, awesome stuff. I just lost the SWR meter bulb, the pots and the sliders have gone scratchy, Planning to do this one of these weekends. Good luck my friend , greetings from India VU2RPS
Very good video someone gave me a connex CB radio that doesn't work I have watched all of you videos so I know your opinion on back boxes I was going to try to get it working myself you said they are know for bad solder joints but I wasn't sure what a bad joint looked like. .very good this helped a lot . Now I am going to give it a try I figured I don't have anything to lose and and the radio don't work anyway . Thanks again
Hi Mike. Believe it or not that power cord that he sent you was what was included with my TS-680 new. His may have seen better days but those fuse holders were what they shipped it with. I still have mine somwhere but I use a Kenwood power supply these days.
Judging from the symptoms and your description of what's happening up to the 8 minute mark, my educated guess is a bad solder joint that is expanding and contracting when it heats up and cools down, or when it got shipped. I'm going to keep watching to see if I was right. EDIT Yay, I was right!
Thanks for the video Mike! My TS-430s suffered from cold solder joints in the final section. I had to remove the old solder and add a "Z" jumper for the pass-throughs for the transistors in order to clear up the no TX problem after an extended keydown period. On a side note, i find it a bit strange that these rigs have an output of 100+ watts on AM - I always thought they were throttled back to 25. I thought mine was modded! 73...
had a ts-430 years ago,it output 100w on 28mhz but got lower down the bands,it was down to 7w on 80m,turns out it was bad pa driver transistors,wierd! 73 m3vuv.
I have a kenwood ts 680 s that I would like to get checked out I can receive but not sure what all is wrong with it this is the first one that I have ever owned so I am still learning how it works
I have a ts140 and one day low power out from 100watts to maybe 10watts disassemble and check the 2sc2879 and are fine the only thing I've noticed is a torroid in the padeck could be burnt ? it receives fine. just low power out put
@@TheRadioShop : I've had Mike go thru 3 of mine so far. I won't have anyone else do them. There are a few things I can do myself and I've had them filleted on my bench many times. If it comes down to it, I will replace batteries, or the overload bulb in the receiver and such, but Mike gets everything else! He'll be happy to know that I have them all for sale now, and am currently awaiting my FT-990 that will be my daily rig.
LOL, don't know about the "would rather work on" part but sure. The 757's are nice radios but as Buddy (The Radio Shop) sais they can be a little bit of a PITA to work on some times.
Thanks! This was a great overview that will help me out. What type of oil did you use to lube the fan after you cleaned it? Did you also clean any of the pots or sliders since you already had the radio open?
Absolutely awesome video. I have a ts-140s I've been using it for years without a problem. But lately I've been starting to see that I'm losing power sometimes only transmit 60 watch. I would love to have you look at my radio how do I get in touch with you.
Yes but that depends on TX modifications done to radios. MARS/CAP mods done to radios effect TX range differently on different makes and models. This radio had some of those mods done to it previously.
Hi Mike, You're correct, but most of the amateur radios don't have the MARS/CAP mods. Since it had the mods, it will transmit on more freqs. Good info on re-soldering all the relays. 73 WB3BJU
I would have to disagree. A large number of the customers radios I see on my bench, I have bought used and have seen owned by licensed amateurs have the MARS/CAP mods done to them. I swear people do it just because they "can", even if they never transmit on those frequencies.
Hi good day sir!, love your educational videos which got me to thinking I have a ranger 2970dx with no transmit is it possible to ship my radio to you for repairs will pay for the ride to and fro plus cost of repairs 73s, 9z4apa .
Good afternoon. Receive a cordial, greetings from a distance. This is to ask you a question if you have your kenwood ts140s equipment working in digital, if you did it with the max 232 to connect it to the pc, so that it changes frequency both by the radio and by the pc. If you could explain to me or provide me with a diagram how to do it, I would be grateful. 73.Dx. YV1HGS.
hey mike do you still work on kenwood ts-140=s radios? i got one that i loos a few channels on all bands and get a morse code tone the channel display goes out , gets 4 dots then if i move the tune knob left or right a few channels , the frequency will come back in and work fine
Hello.. I have kenwood ts850sat. Today my rig doesn't doing RX and TX... Only rx in fm amd am.. May I know what is faulty.. And how much its cost to repair
Im new to the CB world. Ive recently acquired 2 Cobra 2000 gtls and a 1000. I would love to get you to go thru them and make them like new. Please let me know what I need to do to get set up with you to make this happen. Thanks for any help...😊
Dear I need to get the ROM of a TS 140S since it was taken out in some technical service through which the equipment passed. Could you give me some suggestion? Thank you!
hey mike i have a radio shack htx 100 that needs look at.. it will transmit on cw but will not on phone!!and what makes matter wares i all so have and htx 10 that a got new from radio shack back years a go new it will not trans mitt drop me a mess
im mechanical engineering graduate and work in electronics industry ,,and its hard to understand signal and also hard to find how to signal trace receiving signal ,i already know how to trace transmitting signal. can someone help me to find and what equipment to use in tracing signal from defective RX Radio.?
I don't think that that radio has been opened up. The 160 meter you are below 1.8. Same on 12 meters, you are below 24.890. I haven't watched the complete video yet. Rig definitely has other issues. Back to the video now. I love your video's. Plus your willingness to share your expertise , and your wealth of knowledge. 73
I bought a 140 in 1989 and had it for 10 years. The guy I sold it to still uses it, without a hiccup to this day, 32 years later.
I have one still in use too on channel 38
And thank you for demonstrating what a cold solder looks like. I've skipped over connections that looked like you showed thinking they were good. Super educational man!
I know what to look for now. Thank you.
Awesome finally an old Kenwood video! They are so affordable that more and more people are getting them and it's great when Mike does them so we can learn how to troubleshoot. These and the early hybrids are fantastic radios to document here!
TS-940s restoration. Power output on all but the 160 meter band, was unsure. I unplug the PA and hook to a load and meter and I got power. Then hooked to out of low pass, no out on 160. Started clicking through the bands, used a flashlight on relays, sure enough one relay not moving. Found an open coil winding in relay. So when key up all power reflected back, lucky no damage. Since this low pass has its directional coupler for SWR after the low pass, radio had no idea it was destroying itself. Love the videos. Sorry I rant a lot.
I bought a used TS140S in 1989 and I still use it today. It had the MARS/CAP modification so it will transmit just about anywhere, but I never use it out of band. The guy I bought it from had a MARS permit so I know he used it for that. He also had CB19 programmed into one of the memories so he was probably on there a lot too. The rig still works pretty well, except the fan doesn't seem to come on anymore. Not sure if the fan needs to be replaced or something else. Thanks for doing this interesting video.
Thank you! I had no xmit but partial receive on 40m and suspected the relays. Found cold solder joints as you did and followed your advice. Works like a champ again! Thank you! 73 de WB2SMK
One of my favorite radios. Easy to use and easy to work on. Should have never sold mine after 14 years. I miss it. Good advise on how to re-solder those relays Mike. I completely agree. Only down fall with these rigs are those slide switches. Thanks for sharing.
Hi buddy. I was gonna ask you what you thought of this rig. Those slide switches are stupid but have you heard of any other complaints? Thanks. Richard Wilson
Other than the slide switches these are great units. I had mine for years and never a failure with it. I would love to own one again. Had good audio and strong signal. Easy to operate. Only complaint I can think of is folks using them on another service and blowing the finals out. Other than that, great radios.
Nice job Mike… Right on target with preventative maintenance , Been there done that with my own stuff. You learn the hard way real fast.
Great job Mike. I picked this radio at the Ft. Wayne Hamfest about 3 years ago. You're right about the ease of access. I added a filter for CW and a digital input for computer. Military guys make a mod to transmit on mil frequencies, (actually any frequencies). I know there's a trick to broadcasting on AM but it will broadcast at 40 watts or less. My power cord looks vaguely similar. weird. Thanks for the video.
It's amazing the PA did not self destruct when the output was grounded.
Definitely, B Blod... the fuse is hero in that part of the story... it blew before the PA transistors could get hot enough to go super-critical and detonate. :-)
Fantastic Mike, I do have one of this Radio, awesome stuff. I just lost the SWR meter bulb, the pots and the sliders have gone scratchy, Planning to do this one of these weekends. Good luck my friend , greetings from India VU2RPS
Ahhhh, you didn't let us see it with the bulb replaced. Nice radio though and access is very good. Love your repairs Mike.
Very good video someone gave me a connex CB radio that doesn't work I have watched all of you videos so I know your opinion on back boxes I was going to try to get it working myself you said they are know for bad solder joints but I wasn't sure what a bad joint looked like. .very good this helped a lot . Now I am going to give it a try I figured I don't have anything to lose and and the radio don't work anyway . Thanks again
Hi Mike. Believe it or not that power cord that he sent you was what was included with my TS-680 new. His may have seen better days but those fuse holders were what they shipped it with. I still have mine somwhere but I use a Kenwood power supply these days.
I have a Kenwood TS-140s also and that is the power cord mine came with as well.
I got one of these used it worked for about 2 weeks then just started blowing fuse's, as soon as it was hooked up to power.
Judging from the symptoms and your description of what's happening up to the 8 minute mark, my educated guess is a bad solder joint that is expanding and contracting when it heats up and cools down, or when it got shipped.
I'm going to keep watching to see if I was right.
EDIT
Yay, I was right!
Thanks for the video Mike! My TS-430s suffered from cold solder joints in the final section. I had to remove the old solder and add a "Z" jumper for the pass-throughs for the transistors in order to clear up the no TX problem after an extended keydown period.
On a side note, i find it a bit strange that these rigs have an output of 100+ watts on AM - I always thought they were throttled back to 25. I thought mine was modded! 73...
Another great one Mike. Thank you.
Yep, that power cord is stock with the 140'3, 430's,440's. Round glass fuse holders.
Thank you
Great tip Mike,.listen to those clicks. thx
Excellent video Mike I'm going to go for the ts450 SAT brand new and I'm back out
had a ts-430 years ago,it output 100w on 28mhz but got lower down the bands,it was down to 7w on 80m,turns out it was bad pa driver transistors,wierd! 73 m3vuv.
It wont transmit on the am broadcast band.....
Precisely.
My first radio was a 140S and I had this exact problem with mine. I ended up reflowing the entire board.
I have a kenwood ts 680 s that I would like to get checked out I can receive but not sure what all is wrong with it this is the first one that I have ever owned so I am still learning how it works
great job !
I have a ts140 and one day low power out from 100watts to maybe 10watts disassemble and check the 2sc2879 and are fine the only thing I've noticed is a torroid in the padeck could be burnt ? it receives fine. just low power out put
Yep @11:44 I saw the 2 broken solder joints .....
At 15:40 you mentioned using a good lead/tin/silver solder...Can you please recommend a brand?
And Thank You for sharing your knowledge 😊
What is block diagram in trouble.? Rx can received within one second after that come back no recieve anymore. Just noise is heared...🙏
Great radio I have one easy to fix
yes sir, If a person wanted to get some work done by you how would I get in touch with you? I tried to email you while ago but it wouldn't let me
Great video, Mike. But you KNOW you'd rather work on all my FT-757s!! ;)
the 757 is a pita to work on. Have one on the bench with no TX or RX.
@@TheRadioShop : I've had Mike go thru 3 of mine so far. I won't have anyone else do them. There are a few things I can do myself and I've had them filleted on my bench many times. If it comes down to it, I will replace batteries, or the overload bulb in the receiver and such, but Mike gets everything else! He'll be happy to know that I have them all for sale now, and am currently awaiting my FT-990 that will be my daily rig.
Agreed, Mike would be my choice of techs to repair these. I should send him mine :-)
LOL, don't know about the "would rather work on" part but sure. The 757's are nice radios but as Buddy (The Radio Shop) sais they can be a little bit of a PITA to work on some times.
@@mikesradiorepair : LOL. Selling them all and I've got an FT-990 coming. Have to wait til I get it to see if you'll get it or not! ;)
Thanks! This was a great overview that will help me out. What type of oil did you use to lube the fan after you cleaned it? Did you also clean any of the pots or sliders since you already had the radio open?
Bought this model kenwood radio. I have this problem as well. Mike are you taking radios in to repair or who is ?
Absolutely awesome video. I have a ts-140s I've been using it for years without a problem. But lately I've been starting to see that I'm losing power sometimes only transmit 60 watch. I would love to have you look at my radio how do I get in touch with you.
Do you still do repairs I have a Icom 718 that needs some attention
Dang.... I seen about 6 bad solder joints on that board. Reflow the whole board.
Hi Mike,
You need the get out the amateur band chart. Some of the freq you selected were out of the band and it won't transmit. 73 WB3BJU
Yes but that depends on TX modifications done to radios. MARS/CAP mods done to radios effect TX range differently on different makes and models. This radio had some of those mods done to it previously.
Hi Mike,
You're correct, but most of the amateur radios don't have the MARS/CAP mods. Since it had the mods, it will transmit on more freqs. Good info on re-soldering all the relays. 73 WB3BJU
I would have to disagree. A large number of the customers radios I see on my bench, I have bought used and have seen owned by licensed amateurs have the MARS/CAP mods done to them. I swear people do it just because they "can", even if they never transmit on those frequencies.
Hi good day sir!, love your educational videos which got me to thinking I have a ranger 2970dx with no transmit is it possible to ship my radio to you for repairs will pay for the ride to and fro plus cost of repairs 73s, 9z4apa .
You sound like Allan Alda 😀
Good afternoon. Receive a cordial, greetings from a distance. This is to ask you a question if you have your kenwood ts140s equipment working in digital, if you did it with the max 232 to connect it to the pc, so that it changes frequency both by the radio and by the pc. If you could explain to me or provide me with a diagram how to do it, I would be grateful. 73.Dx.
YV1HGS.
1,8 - top band to 2.0 mhz tx Rx 1,5 mhz out of band
Clean Install, we will be at Knowledge Fest please check us out.
Is there a way to cut that beep off?
Not designed to transmit below 1.8 mhz
hey mike do you still work on kenwood ts-140=s radios? i got one that i loos a few channels on all bands and get a morse code tone the channel display goes out , gets 4 dots then if i move the tune knob left or right a few channels , the frequency will come back in and work fine
Hello.. I have kenwood ts850sat. Today my rig doesn't doing RX and TX... Only rx in fm amd am.. May I know what is faulty.. And how much its cost to repair
oh thought we was going to see the repair?
Im new to the CB world. Ive recently acquired 2 Cobra 2000 gtls and a 1000. I would love to get you to go thru them and make them like new. Please let me know what I need to do to get set up with you to make this happen. Thanks for any help...😊
I just got my hands on a 680s and it needs new finals is there any alternatives to the originals? Also the fm rx signal is very very high any ideas?
Dear I need to get the ROM of a TS 140S since it was taken out in some technical service through which the equipment passed. Could you give me some suggestion? Thank you!
hey mike i have a radio shack htx 100 that needs look at.. it will transmit on cw but will not on phone!!and what makes matter wares i all so have and htx 10 that a got new from radio shack back years a go new it will not trans mitt drop me a mess
The hams on 10 are not ready for Napalm Death.
I think mine has the same problem.
im mechanical engineering graduate and work in electronics industry ,,and its hard to understand signal and also hard to find how to signal trace receiving signal ,i already know how to trace transmitting signal. can someone help me to find and what equipment to use in tracing signal from defective RX Radio.?
hello, do you know which is the trimmer to increase the modulation in am.grazie
There is none. Most amateur radios have no AM modulation adjustment. HF rigs are designed for SSB performance not AM.
@@mikesradiorepair there is no trimmer to increase the modulation an am? mic gain?
I don't think that that radio has been opened up. The 160 meter you are below 1.8.
Same on 12 meters, you are below 24.890. I haven't watched the complete video yet. Rig definitely has other issues. Back to the video now.
I love your video's. Plus your willingness to share your expertise , and your wealth of knowledge.
73
oh i had one of these a .. Trash of Tin shit i.e TS ..jeff
Thanks for the video how can I contact you
And lot of hat there
Only got one thing to say... \m/