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i have a ts-430

it kicks off the radio when more than 40 watts output is reached.
had a bad fan. but replaced it and still same prob.
you can key up 50. but if you talk it. shuts down.
if you turn on the proc. it shuts off right then.

any help would be great.

73s
kj4mqa
it is fixed was a bad ground wire on the power cord.

Find out where the thermal sensing/shutdown switch is - for starters. If your meter has a temp function on it - use the probe to find out where the heat is.

Are yous sure that the SWR is in the acceptable range?

Either something is going bad - or the heat isn't being dissipated fast enough. It's got to be something along those lines. Having a heat probe would sure help a bunch...

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What gear do I use?
BASE: Kenwood TS-2000 w/Alpha Delta DX-CC, Diamond X50A, and IMAX 2000.
OUTBOARD GEAR: MXL V88 Condenser mic, BBE 822A Maximizer, Behringer U/G Pro2200 mic preamp and DEQ2496 digital EQ/Comp/Limiter/Expander
MOBILE: Galaxy DX99V w/RF Limited CR-577 mic, Wilson 1000. Yaesu FT-8800R & Diamond NR-770.
"...World Radio One-One Northern CAL - Standing By..."

yes the swr or 1.2
the prob was worse before i put the fan on it.
it also sounds like a fan running in the back ground even with
the mike gain off??

thanks for the help. 73 kj4mqa

My voltmeter has temp sensing function; if you don't have one that does - borrow one if you can. Something in the output circuit is obviously getting too hot. Maybe a bias resistor - or a final.

Sounds like a part is becoming 'microphonic', could be a resistor. Tap a few of the parts around the output circuit -very gently- when keyed, until one is found that is excessively noisy. Bingo. Be discerning and careful when tapping; otherwise you may pick the wrong part.
'Care' - is the keyword...

BTW-Is there enough heat sink thermal grease between the final and the heatsink? Re-apply a dab - and be sure.

__________________
What gear do I use?
BASE: Kenwood TS-2000 w/Alpha Delta DX-CC, Diamond X50A, and IMAX 2000.
OUTBOARD GEAR: MXL V88 Condenser mic, BBE 822A Maximizer, Behringer U/G Pro2200 mic preamp and DEQ2496 digital EQ/Comp/Limiter/Expander
MOBILE: Galaxy DX99V w/RF Limited CR-577 mic, Wilson 1000. Yaesu FT-8800R & Diamond NR-770.
"...World Radio One-One Northern CAL - Standing By..."

it had a bad fan and the guy i got it from kept on tallking on it.
i replaced the fan. it got better .and went from 25-to 40 watts.
before it kicks out.
so i guess its the finals.

thanks for the help 73s kj4mqa

what size power supply are you using?

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As such the device is not protected against interference and the parties operating such a device can not seek redress from parties operating radio communication services. In other words they do not get protection from interference and thus must accept interference. Because of this, any part 15 device should be designed to operate robustly under all conditions

i use a 22 amp 25 amp surge pyle.
swr 1.2

Are you on AM or SSB? Like most rigs of this type, the 430 is only rated at 60W AM. If you're not using a good external meter your readings could easily be off several watts.

I'd never run a TS-430 more than 45-50 watts, even if the power supply would let me. It wouldn't let me for very long.

__________________
If you're like everybody else,
you're about average.
73 de K7KBN
CWO4 USNR RET.

ssb it shuts down at 20 watts on a dosy and my mfj
and it runs 50 and shuts down on am.
the more audio you put in the faster it shuts down.
ssb with the mike gain up 75% it shuts off as soon as you key it up.

My ts-430 will do 165 watts am/cw/ssb's

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"God invented man because he was disappointed in the monkey" Samuel Langhorne Clemens