Thanks for the educational video. My D710 had the same problem. I was told by the local radio store here in Toronto, Canada the repair will cost me 350 Dollars. I called Kenwood Canada, explaned to them it is a well known problem. The answer was " the D710 is out of warranty, we can't help you " THANKS KENWOOD ( China is making disposable radios ) I followed your video stepp by stepp and the radio is better than the original was. I'm not a big repair man, but the way you explaining it it is so easy to fallow. At the end it was costing me only 25 Dollars for parts plus a learning experience to fix the radio. I have a Kenwood D-700 radio for more then 20 years and running in APRS mode 24 hours. I never had any problems with the filters. The cooling fan needs to be replaced regularly because the stop and go starts every 10 minutes when the radio transmit. Thank you Peter for your help. Arpad ( VA3VAD )
Very well done! My D710 just started exhibiting this exact symptom (very weak receive on B band) and I was dreading the thought of sending it off for repair. I opened it up and my filters look just like the ones in the video - perhaps a little worse. I ordered replacements for all four from Kenwood for a total of just a little over $24 US, including shipping, and I'll soon have the joy of repairing my own radio and saving a few hundred dollars and more than a few weeks of down time in the process. Also, I fell in love with the Siglent DMM you are using and ordered the SDM3055 5.5 digit version after watching the video. I really needed a good bench DMM to augment my Fluke 8020B (still going strong after over 35 years!) and my Fluke 89. Thanks again for a great video - this is one of the best DIY videos I have seen. 73 DE AA7K
Thank you for your excellent video. I have a D710 with the exact same problem, and you just saved me many days of troubleshooting or more probably the need to purchase a new radio. Your clear and logical explanations are especially appreciated. I plan to tackle the repair in the near future.
Hello Peter, i am not a person to pay compliments every time, but this time you get a real big compliment from me, not for only this video but nearly all your video's, they are top quality and very informative. I learn a lot, Bas, PE1JIY
Hi Peter, Excellent description of the repair. I always enjoy your videos, because of the way you step through and try to understand the issue before developing a strategy for repair. Great video. 73
Peter, I am glad you went this route you took to troubleshoot the radio. It was a lot better than going straight to the source and we get to learn so much more. Very well done my friend. On another note I have two more videos to do in the next week. One will be just a general shop talk then we will be shooting video number 100. I have something special for video 100. Take care my friend. Buddy
Thank you Buddy glad that you like the video! Ah very interesting will watch out for your new videos. I'm a bit behind as I was out the last week for business travel.. Take care my friend. 73
a friend had a deaf TS2000--- Same problem. Ceramic bandpass filters. When Ken opened the radio, they looked like they had water bubbled up on the top. He called Kenwood for the repair ...they covered them under warranty, and said that the filters were put on before the boards were cleaned at the factory.. the problem: The filters they used then were not water proof, and the cleaner was part water. Now the guy at the kenwood depot may have been pulling his leg, but the things did look like water was making its way out of the plastic.. His radio worked perfectly after the repair.. until hit by lightning...
Again, another comprehensive and interesting view of diagnosis and correction - thank you! I just (3 weeks ago) bought the latest version of this radio :-) Seeing the devices opened and tested gives me courage for the future. -Rocky
Tnx for the nice video , I also have this very same D710 , but meanwhile no troubles . I knew about the issue , and some people solved the issue by adding SMD condensators to prevent the DC power . Last time I checked the filters , they were clean , but now I've learned that the TOKO-quality is the problem and not so much the DC . . . Now I regret that I didn't had a look which filters are installed in my radio , now the radio is built in , and it is difficult to get it out . Well , just let see what will be in the future , if the radio goes wrong then there is a new nice project to do , and the better quality filters will do the job then . . . Tnx again for the nice video , and 73 de 4Z4DP
Another great repair Peter. I'm really starting to hate those filters. I don't know if they changed something in the manufacturing process but they just don't seem to last as long as they use to. I replace so many of them in radios these days I should own stock in the company. I'm lucky with my communications test set. The Stabilock 4040 I have has all the options including the frequency doubler module. it covers from 400KHz up to 1.85GHz. Was so lucky to get one that had that option. Thanks for sharing.
Many thanks for that repair video, Peter. I would like to point out that by using the desoldering gun, an important fact for being successful is the the right choice of the nozzle. The nozzle needs to be the size of the metal pins of the part. By choosing this the preheating of the part and the plane goes in one move. And always have in mind… “Hey solder I heat you up before you got sucked up”… 😂 And what about the root cause of that corrosion…? Well, it just could be a manufacturing issue at the TOKO plant. Maybe the used filter were not correctly manufactured. I have three TM D710, all bought used and only one got that issue. So if Kenwood did not change the PCB design, statistically it point towards the part issue at the TOKO plant. Thanks for sharing es 72/3 de DM5TU - OM sTef
Wow.. great video. Thanks for bringing back memories of my days in the electronics world.. LOL.. just wish I still had my solder sucker.. hmmm.. might be time for another tool I need to acquire again.. I have a TM-V71A with the same issue and it appears it's well known. Never would have known it had I not watched this whole video. Great job! 73!
Thanks Peter very good video. The yaesu radios have the same problem. The filters were made from plastic that would aborbed moisture over time. I heard a similar thing said about the dc voltage applied to the filters. When i checked the specs on theses filters the manufacturers state that dc voltages are ok going into the filters, but dc voltages should be avoided on the output side to prevent damages to the filters.
Hi Henry, yeah all radios using this Toko filters have the same problem and I agree the story with the DC is not the most critical point. It is moe a qualty issue with the filters. Thanks for watching 73
Thanks for the great repair video! Could you shortly explain how you probed the signal-level at the (high impedance?) crystal filters. Did you use an active probe or directly into the 50R of the spectrum analyzer? 73, Thanks @TRX Lab
Great video Your videos have may me better at repairing my radios and my friends radio. One question do you have to get the filters from Kenwood or is there somewhere else to buy them? Thank you again you are very kind the put up all this information.
Thank you for the fantastic video. I used it to diagnose my 710. Waiting for new filters to come in the mail. As far as thermal compound what do you replace it with? Dielectric grease?
show us the rf probe connected to spectrum analizer.you use it to pick up signals to spectrum analizer but too inject signals from your rf generator.you can inject the signals 45.05 mhz and 49.950mhz at -70dbm to the input of cristal filters.i repaired a marine vhf like this last week.i like very much how you explain with exchematics too.thank you Peter
Great video. I had the exact same problem on my TS-2000X, and saw the same thing. The filters were covered with creeping crud yet the rest of the radio was spotless inside. Low resistance was measured and the filters replaced. All working again. I would sure like to see an explanation for where the crud comes from and why it is on the outside of the filters. The packages appear to be sealed! Mine were also the same brand filter.
Friend here in town discovered his used TS 2000 was deaf. The problem was the filters-- all had moisture in them that shorted out the crystals. Kenwood replaced them.. even though it was out of warranty.
love the videos!!! I've learnt a lot and have really streamlined my Diag process thanks to you. if you have time, could you do a video on your SSB lab monitor/speaker? I'm thinking of doing something similar. thanks again for the videos!
Hello Peter, I was wondering if you could make a small video, explaining the basic use of the "Rohde & Schwarz CMT" Tester that you use in your video ( at 4m 00sec ). I aquired one of these for my small lab, but I use it only to check TX frequency and power. How can I get the most out of this device ? I have the model without the scope. Thanks for your great easy-to-follow instruction video's !!! I am a fan ! Kevin ON5DRE.
Another fantastic tutorial video Peter. I too have replaced many many ceramic IF filters over the last twenty years. I have never seen any covered in that kind of corrosion. I might have missed it in the video, but did you determine where that came from? I though the cases of the filters were plastic. 73
Hi Michael, no didn't say something about the cause as I don't know it exactly. A lot has been said about that but nothing we could trust 100%. Toko can say it for sure but definitely won't do it... Thanks for watching 73
Hi peter another suscess would these bypass filters have a short working life it is a joy to watch an electronic engineer at work so much learning with fault finding but no 2 faults are the same it takes to have achemic diagram to help you in the right direction . John
Hi Peter I noticed that the manufacturer of the new filters has been changed do we know if these are now reliable and last much longer than the OEM parts used in production. there must be 1000s of these radios from this kenwood production era out there, great video as always from you thanks and keep em coming cheers Sean
Hi Sean, well I believe that Kenwood has identified an quality issue with the Toko filters..We will see in the future if the new brand will last longer, yet we don't know. Thanks for watching 73
I thought the problem with the ceramic filters was they would fail if any DC bias was applied for a long time. Wasn't there a video you did a while ago showing how you can add DC blocking capacitors? Maybe this is another failure mode for these TOKO filters? Thanks as always, super great video! de KA2ZOH
Hi Herbert, no I never added caps but may be I had a radio on the bench where this caps has been installed before. Well it might be that DC has an impact but I believe it is not to dramatical. The problem with the filters is more a production issue.. Thanks for watching 73
Woher kommt die Korrosion an den Filtern? Ich kenne solch ein Bild eher von den alten roten Roederstein Kondensatoren die nach den Jahren Risse bekommen haben!
Es gibt hier wohl ein Produktonsproblem. Es wird wohl Feuchtigkeit absorbiert, möglicherweise durch die Verwendung nicht idealer Materialien.. Danke fürs vorbeischauen. 73
On some of the Kenwoods the filter is destroyed by the switching voltage for the PIN diodes due to missing caps. You can check this document:www.k2dsl.com/wp-content/uploads/2011/06/TS-2000-receiver-crackling-noise-problem-Repair-procedure.pdf 73 de LA7SJA
Hi Johan, well I know all this reports but I don't believe it. It might be that there is a minor problem with DC but you don't find a warning in the filter data sheet and no radio manufacturer is putting DC blocking caps in front of those filters. I believe it is more a filter quality issue during production .. Thanks for comment 73
The problem was factory based.. the boards got washed, but the filters were not water proof.. His filters had the same ugly appearance, like they had been stuck in a washing machine with corrosive detergents..
You do realize he is German right? Dude is German, is currently in Germany and produces videos in English for an international audience. Tell me again, why should he speak French?
Thanks for the educational video.
My D710 had the same problem.
I was told by the local radio store here in Toronto, Canada the repair will cost me 350 Dollars.
I called Kenwood Canada, explaned to them it is a well known problem. The answer was " the D710 is out of warranty, we can't help you "
THANKS KENWOOD ( China is making disposable radios )
I followed your video stepp by stepp and the radio is better than the original was.
I'm not a big repair man, but the way you explaining it it is so easy to fallow.
At the end it was costing me only 25 Dollars for parts plus a learning experience to fix the radio.
I have a Kenwood D-700 radio for more then 20 years and running in APRS mode 24 hours.
I never had any problems with the filters. The cooling fan needs to be replaced regularly because the stop and go starts every 10 minutes when the radio transmit.
Thank you Peter for your help.
Arpad ( VA3VAD )
Glad that the video was helpful for you...350 Dollars is really a lot of money.. Thanks for watching 73
Very well done! My D710 just started exhibiting this exact symptom (very weak receive on B band) and I was dreading the thought of sending it off for repair. I opened it up and my filters look just like the ones in the video - perhaps a little worse. I ordered replacements for all four from Kenwood for a total of just a little over $24 US, including shipping, and I'll soon have the joy of repairing my own radio and saving a few hundred dollars and more than a few weeks of down time in the process. Also, I fell in love with the Siglent DMM you are using and ordered the SDM3055 5.5 digit version after watching the video. I really needed a good bench DMM to augment my Fluke 8020B (still going strong after over 35 years!) and my Fluke 89. Thanks again for a great video - this is one of the best DIY videos I have seen.
73 DE AA7K
Thanks for feed-back! Glad that my video was helpful for you...The Siglent is a cool DMM you will like it. All the best 73
Thank you for your excellent video. I have a D710 with the exact same problem, and you just saved me many days of troubleshooting or more probably the need to purchase a new radio.
Your clear and logical explanations are especially appreciated. I plan to tackle the repair in the near future.
Hello Peter, i am not a person to pay compliments every time, but this time you get a real big compliment from me, not for only this video but nearly all your video's, they are top quality and very informative. I learn a lot, Bas, PE1JIY
Hi Bas, thanks for the kind feed-back, glad that you like my videos! All the best 73
Hi Peter, Excellent description of the repair. I always enjoy your videos, because of the way you step through and try to understand the issue before developing a strategy for repair. Great video. 73
Thanks for your feed-back, Larry. Really glad that you like my videos...All the best 73
Peter, I am glad you went this route you took to troubleshoot the radio. It was a lot better than going straight to the source and we get to learn so much more. Very well done my friend. On another note I have two more videos to do in the next week. One will be just a general shop talk then we will be shooting video number 100. I have something special for video 100. Take care my friend. Buddy
Thank you Buddy glad that you like the video! Ah very interesting will watch out for your new videos. I'm a bit behind as I was out the last week for business travel.. Take care my friend. 73
Very good fault finding Peter....glad you managed to sort out the Kenwood.Thankyou for taking the time to show us your work.
Thanks for watching! 73
a friend had a deaf TS2000--- Same problem. Ceramic bandpass filters. When Ken opened the radio, they looked like they had water bubbled up on the top. He called Kenwood for the repair ...they covered them under warranty, and said that the filters were put on before the boards were cleaned at the factory.. the problem: The filters they used then were not water proof, and the cleaner was part water. Now the guy at the kenwood depot may have been pulling his leg, but the things did look like water was making its way out of the plastic.. His radio worked perfectly after the repair.. until hit by lightning...
Again, another comprehensive and interesting view of diagnosis and correction - thank you! I just (3 weeks ago) bought the latest version of this radio :-) Seeing the devices opened and tested gives me courage for the future. -Rocky
very good good luck you can do it..
Tnx for the nice video , I also have this very same D710 , but meanwhile no troubles .
I knew about the issue , and some people solved the issue by adding SMD condensators to prevent the DC power .
Last time I checked the filters , they were clean , but now I've learned that the TOKO-quality is the problem and not so much the DC . . .
Now I regret that I didn't had a look which filters are installed in my radio , now the radio is built in , and it is difficult to get it out .
Well , just let see what will be in the future , if the radio goes wrong then there is a new nice project to do , and the better quality filters will do the job then . . .
Tnx again for the nice video , and 73 de 4Z4DP
Another great repair Peter. I'm really starting to hate those filters. I don't know if they changed something in the manufacturing process but they just don't seem to last as long as they use to. I replace so many of them in radios these days I should own stock in the company. I'm lucky with my communications test set. The Stabilock 4040 I have has all the options including the frequency doubler module. it covers from 400KHz up to 1.85GHz. Was so lucky to get one that had that option. Thanks for sharing.
LOL yeah I really hate those filters too and yes we should own stock in the company haha.. Thanks for watching Mike 73
Excellent Peter, I have come across common faults to find it was not, so tracking a fault can save a lot of time in this case. N3KQW 73s Peter.
Thanks for feed-back Howard! 73
Thanks for going through all the troubleshooting process. Great Repair.
Thank you Grant 73
Many thanks for that repair video, Peter. I would like to point out that by using the desoldering gun, an important fact for being successful is the the right choice of the nozzle. The nozzle needs to be the size of the metal pins of the part. By choosing this the preheating of the part and the plane goes in one move. And always have in mind… “Hey solder I heat you up before you got sucked up”… 😂 And what about the root cause of that corrosion…? Well, it just could be a manufacturing issue at the TOKO plant. Maybe the used filter were not correctly manufactured. I have three TM D710, all bought used and only one got that issue. So if Kenwood did not change the PCB design, statistically it point towards the part issue at the TOKO plant. Thanks for sharing es 72/3 de DM5TU - OM sTef
A great repair Peter and well explained. Robert.
Thank you Robert 73
Wow.. great video. Thanks for bringing back memories of my days in the electronics world.. LOL.. just wish I still had my solder sucker.. hmmm.. might be time for another tool I need to acquire again.. I have a TM-V71A with the same issue and it appears it's well known. Never would have known it had I not watched this whole video. Great job! 73!
Thanks Peter very good video. The yaesu radios have the same problem. The filters were made from plastic that would aborbed moisture over time. I heard a similar thing said about the dc voltage applied to the filters. When i checked the specs on theses filters
the manufacturers state that dc voltages are ok going into the filters, but dc voltages should be avoided on the output side to prevent damages to the filters.
Hi Henry, yeah all radios using this Toko filters have the same problem and I agree the story with the DC is not the most critical point. It is moe a qualty issue with the filters. Thanks for watching 73
Thanks for the great repair video! Could you shortly explain how you probed the signal-level at the (high impedance?) crystal filters. Did you use an active probe or directly into the 50R of the spectrum analyzer? 73, Thanks @TRX Lab
Great video Your videos have may me better at repairing my radios and my friends radio. One question do you have to get the filters from Kenwood or is there somewhere else to buy them? Thank you again you are very kind the put up all this information.
Thank you for the fantastic video. I used it to diagnose my 710. Waiting for new filters to come in the mail. As far as thermal compound what do you replace it with? Dielectric grease?
show us the rf probe connected to spectrum analizer.you use it to pick up signals to spectrum analizer but too inject signals from your rf generator.you can inject the signals 45.05 mhz and 49.950mhz at -70dbm to the input of cristal filters.i repaired a marine vhf like this last week.i like very much how you explain with exchematics too.thank you Peter
Hi Jose, the probe I'm using is here www.auburntec.com/ Thanks for watching 73
Great video. I had the exact same problem on my TS-2000X, and saw the same thing. The filters were covered with creeping crud yet the rest of the radio was spotless inside. Low resistance was measured and the filters replaced. All working again. I would sure like to see an explanation for where the crud comes from and why it is on the outside of the filters. The packages appear to be sealed! Mine were also the same brand filter.
I have heard so many explanations on why it happens but I'm still not sure. Thanks for stepping in 73
Friend here in town discovered his used TS 2000 was deaf. The problem was the filters-- all had moisture in them that shorted out the crystals. Kenwood replaced them.. even though it was out of warranty.
Excellent Peter, very interesting as usual enjoyed very much 73's
Thank you Jim! 73
love the videos!!! I've learnt a lot and have really streamlined my Diag process thanks to you. if you have time, could you do a video on your SSB lab monitor/speaker? I'm thinking of doing something similar. thanks again for the videos!
Thanks for feed-back. For the SSB lab monitor are already 3 videos on-line. Watch video #17, #18 and #19, nice week end project.. 73
I was hoping you'd show the OEM for the new filters. Well done. Many radio mfgs have had this ceramic filter issue.
Hi Bob, the filters are supplied by Kenwood original spare parts. We only have the CD with is printed on the new filters... Thanks for watching 73
Hello Peter, I was wondering if you could make a small video, explaining the basic use of the "Rohde & Schwarz CMT" Tester that you use in your video ( at 4m 00sec ). I aquired one of these for my small lab, but I use it only to check TX frequency and power. How can I get the most out of this device ? I have the model without the scope. Thanks for your great easy-to-follow instruction video's !!! I am a fan ! Kevin ON5DRE.
Nice job please keep up the great videos from brian in the states
Thank you Brian 73
Another fantastic tutorial video Peter.
I too have replaced many many ceramic IF filters over the last twenty years. I have never seen any covered in that kind of corrosion. I might have missed it in the video, but did you determine where that came from? I though the cases of the filters were plastic.
73
Hi Michael, no didn't say something about the cause as I don't know it exactly. A lot has been said about that but nothing we could trust 100%. Toko can say it for sure but definitely won't do it... Thanks for watching 73
Great video teacher Peter.
Thank you Claudio! 73
That kind of problem, about ceramic filters, seems very similar to Yaesu 897D...but you have made a good fix as usual. CIAO '73. ;)
Yes all radios using this Toko filters have the same problem. Thanks for watching Alessandro 73
from your high experience, what kind of solution we can apply to fix it !? ..without replace them.. :(
Another great repair video. thank you again
Thank you Dennis! oh with new Avatar..very nice 73
As usually, great repair Peter and thanks a lot for your videos. 73s de Pasquale IW0HEX
Thank you Pasquale! 73
thank you so much....i now have a better understanding of ceramic filters,.
Glad that you like it , Michael 73
Excellent repair as usual.
Hi peter another suscess would these bypass filters have a short working life it is a joy to watch an electronic engineer at work so much learning with fault finding but no 2 faults are the same it takes to have achemic diagram to help you in the right direction . John
Thank you John 73
Hi Peter I noticed that the manufacturer of the new filters has been changed do we know if these are now reliable and last much longer than the OEM parts used in production. there must be 1000s of these radios from this kenwood production era out there, great video as always from you thanks and keep em coming cheers Sean
Hi Sean, well I believe that Kenwood has identified an quality issue with the Toko filters..We will see in the future if the new brand will last longer, yet we don't know. Thanks for watching 73
Another great video well dune and great job.
Thank you Drew. 73
Good incite on a repair also Yeasu has a problem with those ceramic filters.
Thank you! Yes all radios with this filters have problems 73
Did you remove the R654 resistor on the rig? I have the MARS mod and I still see that resistor and have no cross band repeat function.
I'm having same problem with my 710 what does a repair like this cost
I thought the problem with the ceramic filters was they would fail if any DC bias was applied for a long time. Wasn't there a video you did a while ago showing how you can add DC blocking capacitors? Maybe this is another failure mode for these TOKO filters? Thanks as always, super great video! de KA2ZOH
Hi Herbert, no I never added caps but may be I had a radio on the bench where this caps has been installed before. Well it might be that DC has an impact but I believe it is not to dramatical. The problem with the filters is more a production issue.. Thanks for watching 73
That was from another RUclipsr
very good
Thanks for watching 73
Peter another success filters were all about to go well-spotted peter what are those made off? thumbs up
Well that are ceramic filters covered by a pvc housing...73
Buy some punctuation. Charge it to me.
Great Troubleshooting
Thank you David 73
Woher kommt die Korrosion an den Filtern? Ich kenne solch ein Bild eher von den alten roten Roederstein Kondensatoren die nach den Jahren Risse bekommen haben!
Es gibt hier wohl ein Produktonsproblem. Es wird wohl Feuchtigkeit absorbiert, möglicherweise durch die Verwendung nicht idealer Materialien.. Danke fürs vorbeischauen. 73
thank you
Thanks David 73
On some of the Kenwoods the filter is destroyed by the switching voltage for the PIN diodes due to missing caps. You can check this document:www.k2dsl.com/wp-content/uploads/2011/06/TS-2000-receiver-crackling-noise-problem-Repair-procedure.pdf 73 de LA7SJA
Hi Johan, well I know all this reports but I don't believe it. It might be that there is a minor problem with DC but you don't find a warning in the filter data sheet and no radio manufacturer is putting DC blocking caps in front of those filters. I believe it is more a filter quality issue during production .. Thanks for comment 73
The problem was factory based.. the boards got washed, but the filters were not water proof.. His filters had the same ugly appearance, like they had been stuck in a washing machine with corrosive detergents..
Another great video. Thank's
Thank you 73
vous etes en france , la langue est le français.
oh I thought we are in Europe my friend. LOL 73
You do realize he is German right? Dude is German, is currently in Germany and produces videos in English for an international audience. Tell me again, why should he speak French?