[Kenwood] TS-430S problem

[parkjv1 at comcast.net]

also here is the url to the service manual...might help.

http://www.observations.biz/MANUALS/TS430S_serv.pdf

I have the 450SAT myself.

73,

John KD7KFT



-------------- Original message -------------- 
From: Everett Swift <everett at speednetllc.com> 

> Thanks Rob, I forgot to include in my email the list of what I have done 
> so far, Already tried that 2 times. 
> 
> So far I have: 
> tested the radio on a different power supply, cable, antenna and tuner. 
> re soldered every connection on the final circuit board 2 times. 
> checked the ground in the antenna connector. 
> 
> The only parts I have NOT replaced is the IF board, The final assembly, 
> or any parts on the front (switches, display board, ect.) 
> 
> The only reason I haven't replaced the Finals or the IF board is I don't 
> have any available. 
> 
> I spent every penny I had saved getting my ham license and getting the 
> radio and other equipment so I can't afford much to get it fixed or I 
> would ship it to you to repair. 
> My guess is it would cost as much to have repaired as I paid for the radio. 
> 
> I have a VOM and an oscope but I'm not good at the scope yet. 
> 
> Any idea you have on what I can do to fix it would be greatly appreciated. 
> 
> Thanks, 
> Everett Swift, 
> KD8JWJ 
> 
> 
> 
> 
> Rob Stampfli wrote: 
> 
> 
> > On Wed, Jan 07, 2009 at 09:52:55PM -0500, Everett Swift wrote: 
> > 
> >> Hello, 
> >> I need help with my TS-430S. 
> >> It receives fine but when I transmit the transmit power starts out at 
> >> 100 watts with a rapid fluctuation of a few watts, after a second or two 
> >> the wattage swing gets larger and the power slowly drops to nothing. 
> >> The Final heat sink gets warm and the fan kicks on. 
> >> 
> > ... 
> > 
> >> I cant afford much money, I got my License a month ago and spent every 
> >> thing I could afford on this radio, tuner and power supply. 
> >> 
> >> But If you know of anyone who can fix it and not charge $50 an hour let 
> >> me know. 
> >> 
> >> Thanks, 
> >> Everett Swift 
> >> KD8JWJ 
> >> 
> > 
> > Everett, 
> > This sounds like it might be what is a fairly common problem with early 
> > TS-430S units. If it is, the fix is fairly simple and essentially free 
> > it you care to tackle it yourself. 
> > 
> > On the finals board of units manufactured in the first year or so, 
> > Kenwood used some pass-thru rivets that over time developed a resistance 
> > and caused power fluctuation problems. They later soldered these rivets 
> > to prevent this failure mode. You can take out the board and do this 
> > yourself -- and you'll have to if the transistors themselves have been 
> > fried because of this problem -- but that is a pain and there is an 
> > easier workaround if the drivers are still good. Richard Measures, AG6K, 
> > came up with an alternative fix that worked for me. Go to: 
> > 
> > http://www.somis.org/430.html 
> > 
> > and search for "loss of power" for Measure's description and his solution. 
> > 
> > Good luck, 
> > Rob 
> > 
> > 
> > 
> 
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