This is what Kenwood specifies in the service manual. Wish I could find a factory service manual I can get high quality scans of the wire diagrams

@temporarilyoffline

Жыл бұрын

I have the factory service manual for this radio. Very good stuff! I think the schematic is also in the owners manual as well.

@pen25

Жыл бұрын

@@temporarilyoffline you have the original or the scanned copy? If you have the original I might be willing to pay for a copy of a good high res scan

@temporarilyoffline

Жыл бұрын

I don't have access to a scanner, but you can find complete manuals on ebay for a good price: ebay.us/XIWntB

I remember touching a power resistor and being able to read the component value off of my fingertip for days. I'm that kind of guy as well.

@temporarilyoffline

Жыл бұрын

Brother.

Sounds like corrosion on the relay contacts. Burn it off. Do it right, and you don't weld the relay contacts. Trick for checking temp with your finger: lick your finger and tap against the device. If it pops spit, over 100°C. Saved my finger countless times.

@temporarilyoffline

Жыл бұрын

Exactly - removes corrosion. #ProTip on the poppin spit! Thanks!

@LeeMcc_KI5YPR

Жыл бұрын

And of course, maybe a higher wattage resistor, although I can see 3W because the resistor might burn up before the contacts weld. Maybe?

@temporarilyoffline

Жыл бұрын

@@LeeMcc_KI5YPR Higher wattage is perfect. You might even be able to touch it after you're done.

Steve you are just awsome. Can you believe I was sending my TS-430S in to the Radio Doctor to get exactely this same Service done + replacing the Backup Battery and he charged me 250.- Bucks for just pressing and holding the Band Up Button on the radio for 2 Minutes. That explains how he was able to efford his italian Sports Car....😂😂😂. Tnx for sharing this neat Content with us and have a great Weekend. 73 de YFUG💯🙋‍♂

@temporarilyoffline

Жыл бұрын

Italian sports cars are nice - are there any left or are they all German now?

I have that radio also Steve. right now it's at a friend's house who just repaired it it needed a new meter and it got cleaned up and de-cat-haired. my friend used to work for the local TV station in ENG as an engineer. he has all the test gear. I also got a 1.8 & 2.7Khz filter for it. Im n going to sell it to a new ham in our club. I've had this radio since 1998. I'm the second owner. I have both the original service & owner's manual too.

@temporarilyoffline

Жыл бұрын

That will do a new ham very nicely!

That is interesting TO, Since I am putting a Kenwood 930S back into service I need to learn more about this old school trick. I am pretty comfortable with 1980s levels of "safety", as I was a teen in the 1970s and held onto truck beds while wearing clay wheel roller skates, and we went down the freeway.

@temporarilyoffline

Жыл бұрын

See if it has those clear top relays - this is like using a matchbook to clean the points in the dizzy.

@pen25

Жыл бұрын

Download the service manual and check to see if this is the approved method.

Thanks for a vid in the true spirit of HAM radio and not being a shopping network channel disguised as reviews. Very neat cleaning tip, thanks!

@temporarilyoffline

Жыл бұрын

Thanks for watching!

Welp, that's the most stressful video I've watched all morning! Thank you for sharing Steve! Definitely old school cool

@temporarilyoffline

Жыл бұрын

Pucker Factor High!

I did this a few years back on my TS-430 because it was in storage for a few years and the relays developed some oxidation. With my TS-430 I found that 50 ohms works fine. This limits current to a safer 275 mA. or so and means that you can just use any DC coupled dummy load you have laying around rated for 5 watts or more as your series resistor so long as you are careful about how you hook things up. Most of the dummy loads you have around a hf shack are likely to fit the bill, and will work fine. Again - so long as you are VERY careful hooking things up. My connection path worked like this - I adapted the SO239 on the dummy load first to BNC and then BNC to Twin Banana terminals. Then I connected the RED (center pin) Banana terminal on the dummy load to the Positive output of my power supply. This means that the shield and outer shell of the dummy load will now be at a current limited 12 - 13.8 volts positive (so some caution is needed) -- Then I used a single wire banana to banana to connect the other (black) side of the twin banana on the dummy load to the SO239 CENTER OF THE RADIO *** BEFORE *** APPLYING POWER. It's absolutely critical to connect everything up correctly and securely BEFORE you apply power, because any oops wrong connection, or "wire pops loose and shorts out the resistor" accidents COULD DESTROY YOUR TS-430 ! As simple as this hookup is, I hesitate to recommend this DC wiring across a SO239 dummy load connector because, although it worked well for me, it's easy to imagine someone getting confused about how to hook things up, or a jury-rigged wire popping loose and causing a short which will destroy someone's TS-430. The same thing can happen with the setup that Steve demonstrated in this video if the alligator clip pops loose and jiggles forward a bit to contact the other side of the resistor shorting it out and applying non current limited voltage to the TS-430 RF input, but it's a bit less likely because it's such a simple procedure - BUT DO BE CAREFUL !. IT'S CRITICALLY IMPORTANT THAT YOU DON'T LET A SHORT BYPASSING THE CURRENT LIMITING RESISTOR HAPPEN, EVEN A MOMENTARILY, BECAUSE THE RESULTING HIGH CURRENT SURGE COULD DESTROY THE TS-430 FRONT END. ALSO, it should be noted that the separate ground connection that is shown in the video between the shield on the SO239 input on the TS-430 and the PS negative ground is not really needed, because the TS-430 RF input SO239 outer coax is already at ground and the existing PS cable provides the necessary return path. I mention this, not to nit-pick Steve's hookup, but because someone might get confused and assume that, for example, disconnecting this GROUND would somehow stop the current flow in the circuit, when of course, IT WILL NOT . -- or even MORE disastrously, could lead someone to reason that, because it's awkward as hell to hold that resistor pushed into the center pin of the TS-430 SO239 input jack ( it wiggles around a lot and get's too damn hot to hold ! ) - so why not just connect that resistor in the GROUND PATH ? Wouldn't that be EASIER and still provide the necessary current limiting ? The answer is of course NO IT WILL NOT ? -- AND YOU WILL DESTROY THE TS-430 ! A separate ground connection would only be needed when using a separate power supply to provide the relay cleaning current to the TS-430 RF input connector, which, all things considered, would be the safer choice if a bench supply with current limited output is available. In this scenario we would turn the bench supply current limit way down to 500 mA or so - BUT STILL USE A SERIES 30 to 50 OHM RESISTOR (since a current limited supply can still have a nasty capacitor discharge current spike before the current limit kicks in).

@temporarilyoffline

Жыл бұрын

I like it! Use what you have!

@bwilder2324

Жыл бұрын

@@temporarilyoffline Honestly, if I were you I would hold onto that TS-430. It sounded fantastic the other night and seems to have been super well maintained. You don't often find them in mint condition like that - but I am not surprised since you say you found it at an estate sale. Mine is ALSO absolutely MINT, and will ALSO be sold at an "estate sale" (mine) after it's pried from my cold dead hand. The things that sold me on the TS-430 more than 3 decades ago were the no nonsense professional front panel - All the lighted mode switches grouped logically on the left of the main tuning knob - plus all the little things - like the simple single switch from Hamband to MHz band stepping - which makes for simple transition to general coverage RX - and speaking of MHz band general coverage - there is no radio I have EVER seen were it's so easy to open it up to full 1.8 to 30MHz general coverage TX (just remove one connector). I have a ton of radios a IC-705, X6100 companion 125 Watt Amp, and a shiny new FT-710, which does indeed have a hell of an impressive RX. But for a fast on-air check, or or QSO, I find myself most often cranking up the 430 - and not just because it's familiar - it's really that good. Check out the Sherwood report ratings for the 430. Theoretically my FT-710 beats the 430 by 10 dB here 20 dB there, but overall, practically speaking, in VERY careful side by side tests, I have yet to hear a difference.. So you might want to hang onto that one. It's a keeper. Just saying...

@temporarilyoffline

Жыл бұрын

@B Wilder its a great radio. You sound like you've found a best friend and that's amazing! Wishing you many good QSOs!

The service bulletin says 28ohm 10watt resistor. And there is a little maintainer circuit you could assemble and install.

@temporarilyoffline

Жыл бұрын

Pretty neat!

@parker6605

Жыл бұрын

@@temporarilyoffline mine has the same problem but with the t/r switch 😬

@temporarilyoffline

Жыл бұрын

@@parker6605 time to tear it down

@parker6605

Жыл бұрын

@@temporarilyoffline those words scare me 🤣

@temporarilyoffline

Жыл бұрын

@@parker6605 That radio is much bigger on the inside. Lots of stuff going on.

That had to be a intense moment of “this is supposed to work, but will it smoke” moment.

@temporarilyoffline

Жыл бұрын

It was

What would have been sweet is measuring the contact resistance with a low-ohms meter before and after the experiment. I guess, “No User Serviceable Parts Inside”. The smokers residue is like a yellow varnish type and arcing the contacts is suppose to burn-through the residue, theoretically. Nice experiment! 73 KD6UYK (Tim).

@temporarilyoffline

Жыл бұрын

It was fun once I got past the anxiety of doing something this weird. The theory is perfect, the execution...

@pen25

Жыл бұрын

This isn't an experiment. This is well documented in the service manual

I have a 430. Its my main rig for years now. Never saw this done. Hmmm. Thanks. I promise not to burn myself.

@temporarilyoffline

2 ай бұрын

Excellent, stay safe!

I thought you were having a laugh Steve - until I read that it really is a recommended procedure by Kenwood. Heck, looks kind of brutal, and yet, it works! Nice one.

@temporarilyoffline

Жыл бұрын

I was pretty shocked, but it does the thing!

Contact oxidation is/was a common problem on, at least, ICOM 730 and 751 transceivers pre-amp relays. A resistor in the line did the same thing for them as the relays became unobtainable for replacement. If you were lucky your relay 'welded' shut so pre-amp was always on!

@temporarilyoffline

8 ай бұрын

Nice! Self improving circuitry!

Great idea. I will use it if I win an auction for 30 min, and for sure give results of capacitor liquid cleaner - found on amazon pH riser for pools; I wonder how it mixes with IPA. A tip for a tip 0:37 you do not have anything on hand and use an alligator clip, but so-239 is fully compatible with a banana plug; in other words design idea was to envelop the banana plug with a screen.

@temporarilyoffline

Жыл бұрын

Excellent, thanks!

If a lab power supply is available, do you think running a higher voltage at lower current would help even more? Thinking having more an arc flash across the contact versus fusing them together with high amps. That is a 13.8V power supply, correct?

@temporarilyoffline

Жыл бұрын

Its a 13.8v supply - something hams have at the ready.

@tzm1843

3 ай бұрын

I used a current limited supply set to 0.5 Amps. I set it to 13.8V but the current limiting reduced it to a couple of volts.

I need to do this on my 430s. I bought mine 22 years ago and the relays failed on several bands. Think I paid like 75 bucks for it

@temporarilyoffline

Жыл бұрын

Can't lose @ $75!

Funky cool stuff 73

@temporarilyoffline

Жыл бұрын

I was worried!

Thought this was electroboom for a sec! Great trick though! I love the simple science of it!

@temporarilyoffline

Жыл бұрын

I'll take that as a compliment... I think. :-D Glad you liked it!

@d3w4yn3

Жыл бұрын

@@temporarilyoffline he's a mad genius, you two would be two peas in the same pod, well, except for his unibrow!

@temporarilyoffline

Жыл бұрын

@@d3w4yn3 Thanks!

Many relays are design so that the contact wipes it's mating contact as it seats.

@temporarilyoffline

Жыл бұрын

That would be great!

I have a President CB radio that was given to me that I need to open up and clean out. It was mounted in a smokers truck.

@temporarilyoffline

Жыл бұрын

Dishwasher? 🤣

@K1STG-Fred

Жыл бұрын

@@temporarilyoffline Probably going to use a whole can of WD40 contact cleaner 😆

@temporarilyoffline

Жыл бұрын

@@K1STG-Fred Wait for the next video on this radio... I do.

is this only a KENWOOD Trick or is this working on any Rig

@temporarilyoffline

Жыл бұрын

I can't really speak to other radios without having eyes on them. I'd suggest caution or "disposable" radios.

Instead of futzing with resistors, why not just use a current limited supply and set it to 0.5 Amps?

@temporarilyoffline

3 ай бұрын

Because I didn't have a current limited supply.

Daredevil! :D

@temporarilyoffline

Жыл бұрын

Somebody's gotta do it.

You burned your finger! Did you put your tough on the flagpole in the winter when you were a kid? ;-)

@temporarilyoffline

Жыл бұрын

At least once that I'll admit

Doesn’t look one bit sketchy 😳

@temporarilyoffline

Жыл бұрын

Pucker factor: high

hmmm....

@temporarilyoffline

Жыл бұрын

Indeed.

Nice one TO .... not many know that trick Sir! Now, in the spirit of your "Elmer" steam this morning, who shared that with you? 73 - KF6IF

@temporarilyoffline

Жыл бұрын

N4DA among others

That just looks so jank! 😨

@temporarilyoffline

Жыл бұрын

Back when Hams were Hams!

This sounds dangerous to your radio... and your fingers. Haha Is this like by dribbling water into the carburettor to de-carbon the pistons?

@temporarilyoffline

Жыл бұрын

Very similar