Intermittent problems can be a nightmare to track down sometimes. The worst ones are the ones that mysteriously fix themselves. I think sometimes we scare them into working. :-) I'm working on a radio now with intermittent problems but the fault is easy to see. It has bad solder joints all over the board. Thanks for sharing.
Yeah you are right Mike we both and all of our friend here have gone through those pain many times and it is still a nightmare....Have a nice week end..73
Howdy, Peter. Great job on hunting down the problem. I have an old Kenwood 281a (2 meter) and I love that old radio. It's built like a tank and I'm gonna open it up one of these days. When you open up the radio you have to reprogram the radio and I'm not wanting to do that right now. Maybe in the future. Cheers & 73 from W Rusty Lane K9POW in eastern Tennessee
In this particular case, my sense is it is the long plug tines, and when disassembling the components, I feel that instead of a cold solder joint, it was the pins getting slid in and out, thus cleaning them. a radio running as hot as this one worries me, but no fix for that. good job peter, thank you for your dedication.
That is how it goes sometimes Peter. Hard to track an intermittent fault of this nature. Great try and looks like you got it. Thanks for sharing my friend.
Nice fix Peter, those dried joints can be a real pain to track down sometimes. I've lost count of the number of times I have resorted to just reflowing an entire PCB due to so many joints looking suspicious.
Hey Peter! You have successfully repaired the Kenwood. You narrowed down the source of the problem, reflowed everything in that area, as far as I would be concerned, job done. And well done at that. The soak test after confirms your repair. It did look like someone had been "in before" due to the excess of uncleaned flux and skewed surface mounted caps, etc. Who knows the history of their repairs??? And the blue tape with the smiley face? Amazing what is found in previously "repaired" radios Peter!! Good work and continued success! Alles gute! 73, Brian EI8EJB
Those intermittent mechanical problems are tough to find sometimes. Hopefully you got it on this one. Thanks as always for the hard work you do on these videos! 73's de KA2ZOH
TRX A mystery as you say it sounded that there was an dry joints sometime can be very hard to locate as we see another suscess again well done my friend :)
I agree with Budy Peter sometimes u just have to send the radio home and hope u have found the problem. Those intermittent faults are a pain sometimes.
change Q102. it worked on high temperature for a long time (you can see the brown discoloration on the PCB). Also spray a good contact cleaner in the CN107 and CN108 and the corresponding pins.
Nice vedio really enjoying to watch .. my icom 208H in my jeep for 3 years no single problem today i found that I have problem .. Reciving is not like before it's weak for example repeater always 5/9 today 5/5 simplex with my friend also i found same problem change the antenna but same heavy reciving compare it with my icom 207 and I'm sure now I have receiver problem what should I look for ? Can I have parts or no for this old radios ? Do you think it's big problem I love my 208 i don't want other radio in my car HELP ..Thanks
hi good video as always, one of those strange faults, nothing worse than when it fires up lol, im curious why q101 q102 needed why not supply regulator from 13.8v line? seems alot extra circuitry .cheers paul g4sbx
Hello Paul, that is a switched voltage for the rig only applied to the circuit when radio is fired up. You don't want power to the radio in stand by...Thanks for watching 73
Those tin plated pins that join the PC boards together are probably making intermittent contact and need some Deoxit or something like that. The green LED that lights up to show which band is selected is really dim and mine is like that too. Do you have a fix for that?
Intermittents are the Dog Jobs in electronics repair, very frustrating. I use to laugh when people would hit their TV's to get them to work. If I seen anyone doing that, I would say you're just making it worse. When you let these kinds of jobs go back, how confident are you that they won't come back? Well anyways Peter great repair as always, enjoyed it with my coffee. Cheers !
Dog job is the right wording for this....You never can be 100% confident that the radio comes back. The best is to have an open word for the owner and you have to explain honestly how this all hangs together...Thanks for watching Tom Cheers
Good job Peter...I wonder why those audio modules draw so much current with no audio being produced? BTW, what were the two green clipped wires for? 73 - Dino KL0S
Ah okay Dino my talking must have been misleading the audio amps only getting warm if audio is present..... I Have seen the green wires too but have nor investigated the function. Might be exciting to find ou. Have a nice week end 73
the spec needs to be researched on the pdf of the manufacturer. the guide is for general purpose but the pdf will give more accurate specs. double the resistance is not great and maybe with heat it may get worse. I would change them while you are there. just friendly advice
You are right that is what I always say and what is my video #76 is about. But on the other hand I'm not a friend of swapping all out as long there is no real need. In my opinion you always need to judge. Have always in mind that labour is not cheap and someone has to pay it. This radio is not from the sixties the caps are not known to go bad in this radio. The test values are not to worse so we can save money. That is the way I approach this things. If you are doing this jobs for your own you do it different for sure...Thanks for comment 73
I SEE THAT THE TM741'S .23M BAND SHOWS 1378.300. WE STOP AT 1.3 GIGS HERE. WHAT IS THE TOP END OF THAT BAND OVER THERE, DEUTSCHLAND?? DID YOU PUT BACK THE SMILEY FACE? HAHAHAHA :-) I HAD ONE OF THOSE YEARS AGO BUT ONLY 2 AND .7 IN MINE. I HATE GREMLINS :-) HOPE IT IS FIXED. KØOJ KA NULL O JOT
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Intermittent problems can be a nightmare to track down sometimes. The worst ones are the ones that mysteriously fix themselves. I think sometimes we scare them into working. :-) I'm working on a radio now with intermittent problems but the fault is easy to see. It has bad solder joints all over the board. Thanks for sharing.
Yeah you are right Mike we both and all of our friend here have gone through those pain many times and it is still a nightmare....Have a nice week end..73
Howdy, Peter. Great job on hunting down the problem. I have an old Kenwood 281a (2 meter) and I love that old radio. It's built like a tank and I'm gonna open it up one of these days. When you open up the radio you have to reprogram the radio and I'm not wanting to do that right now. Maybe in the future. Cheers & 73 from W Rusty Lane K9POW in eastern Tennessee
In this particular case, my sense is it is the long plug tines, and when disassembling the components, I feel that instead of a cold solder joint, it was the pins getting slid in and out, thus cleaning them. a radio running as hot as this one worries me, but no fix for that. good job peter, thank you for your dedication.
That is how it goes sometimes Peter. Hard to track an intermittent fault of this nature. Great try and looks like you got it. Thanks for sharing my friend.
Yeah you are sooo right my friend, but I hope we hit it :^) Take care 73
Nice fix Peter, those dried joints can be a real pain to track down sometimes. I've lost count of the number of times I have resorted to just reflowing an entire PCB due to so many joints looking suspicious.
Yeah you are right it is a pain and all of us have experience to reflow a complete PCB..73
Dry solder joints are among the toughest to nail dow, you did a superb job, congrats! Lloyd w9nla
Thank you Lloyd, have a nice week end 73
Hey Peter! You have successfully repaired the Kenwood. You narrowed down the source of the problem, reflowed everything in that area, as far as I would be concerned, job done. And well done at that. The soak test after confirms your repair. It did look like someone had been "in before" due to the excess of uncleaned flux and skewed surface mounted caps, etc. Who knows the history of their repairs??? And the blue tape with the smiley face? Amazing what is found in previously "repaired" radios Peter!! Good work and continued success! Alles gute! 73, Brian EI8EJB
Yeah we hope it will no lab return.....but it looks good. Thanks for your words Brian! All the best from house to house...73
Those intermittent mechanical problems are tough to find sometimes. Hopefully you got it on this one. Thanks as always for the hard work you do on these videos! 73's de KA2ZOH
You are right Herbert I hope we got this one. Thanks for watching 73
TRX A mystery as you say it sounded that there was an dry joints sometime can be very hard to locate as we see another suscess again well done my friend :)
Yeah dry joints are a nightmare..Thanks for stepping in my friend 73
I agree with Budy Peter sometimes u just have to send the radio home and hope u have found the problem. Those intermittent faults are a pain sometimes.
You are absolutely right Gary it is a pain....Thanks for watching 73
Thanks Peter, nice video as usually. 73s my friends, Pasquale IW0HEX
Thanks for stepping in my friend. Have a nice week 73
Danke Peter, wie immer klasse, schönes rest Wochenende. 73
Danke fürs vorbeischauen Peter. auch schönes Wochenende...73
change Q102. it worked on high temperature for a long time (you can see the brown discoloration on the PCB). Also spray a good contact cleaner in the CN107 and CN108 and the corresponding pins.
Nice job Peter big thumbs up mate
Thank you Allan! 73
Nice vedio really enjoying to watch .. my icom 208H in my jeep for 3 years no single problem today i found that I have problem ..
Reciving is not like before it's weak for example repeater always 5/9 today 5/5 simplex with my friend also i found same problem change the antenna but same heavy reciving compare it with my icom 207 and I'm sure now I have receiver problem what should I look for ? Can I have parts or no for this old radios ? Do you think it's big problem I love my 208 i don't want other radio in my car HELP ..Thanks
Mysterious! But you did your best.
hi good video as always, one of those strange faults, nothing worse than when it fires up lol, im curious why q101 q102 needed why not supply regulator from 13.8v line? seems alot extra circuitry .cheers
paul
g4sbx
Hello Paul, that is a switched voltage for the rig only applied to the circuit when radio is fired up. You don't want power to the radio in stand by...Thanks for watching 73
Those tin plated pins that join the PC boards together are probably making intermittent contact and need some Deoxit or something like that. The green LED that lights up to show which band is selected is really dim and mine is like that too. Do you have a fix for that?
Intermittents are the Dog Jobs in electronics repair, very frustrating. I use to laugh when people would hit their TV's to get them to work. If I seen anyone doing that, I would say you're just making it worse. When you let these kinds of jobs go back, how confident are you that they won't come back? Well anyways Peter great repair as always, enjoyed it with my coffee. Cheers !
Dog job is the right wording for this....You never can be 100% confident that the radio comes back. The best is to have an open word for the owner and you have to explain honestly how this all hangs together...Thanks for watching Tom Cheers
Good job Peter...I wonder why those audio modules draw so much current with no audio being produced? BTW, what were the two green clipped wires for? 73 - Dino KL0S
Ah okay Dino my talking must have been misleading the audio amps only getting warm if audio is present..... I Have seen the green wires too but have nor investigated the function. Might be exciting to find ou. Have a nice week end 73
great video!
Thank you Santos...73
Not an ordinary 7808; the T means it has a 3A current capacity.
yes it is the T version...Thanks for watching 73
the spec needs to be researched on the pdf of the manufacturer.
the guide is for general purpose but the pdf will give more accurate specs.
double the resistance is not great and maybe with heat it may get worse.
I would change them while you are there.
just friendly advice
max to m or su series is 0.20 endurance 150% = 0.50 @120hz
meter set to D (aka tan d) and 120hz to show correct value
audio ic may be hot from cap resistance
You are right that is what I always say and what is my video #76 is about. But on the other hand I'm not a friend of swapping all out as long there is no real need. In my opinion you always need to judge. Have always in mind that labour is not cheap and someone has to pay it. This radio is not from the sixties the caps are not known to go bad in this radio. The test values are not to worse so we can save money. That is the way I approach this things. If you are doing this jobs for your own you do it different for sure...Thanks for comment 73
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Kenwoods are hard to fix
I SEE THAT THE TM741'S .23M BAND SHOWS 1378.300. WE STOP AT 1.3 GIGS HERE. WHAT IS THE TOP END OF THAT BAND OVER THERE, DEUTSCHLAND?? DID YOU PUT BACK THE SMILEY FACE? HAHAHAHA :-) I HAD ONE OF THOSE YEARS AGO BUT ONLY 2 AND .7 IN MINE. I HATE GREMLINS :-) HOPE IT IS FIXED. KØOJ KA NULL O JOT
Yeah on TX it goes to 1,3G here but RX is not limited...LOL yes smiley back ito the radio haha only kidding Thanks for watching 73
What about the buttons falling out?
That was the missing voltage now all is okay.. 73
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Hi Friends
so I analyzed the problem was in cold welding, in specific in Q102 ..
Most likely yes and the audio ic pins were dried as well...73
Hi ,
I believe it is because these steps have a higher heating due to the current that is consumed , 73
Hii bro my radio modal ICOM IC 2200H MY RADIO PROBLEM OUTGOING OK BUT INCOMING NOT RECEIVED WHAT IS THE PROBLEM BRO