Hi all, I never had this problem.  However, I had a Kenwood
mobil rig some years back. The radio worked fine except
every now and then the mic audio was reduced to about 10%.
Now, I removed the mic connector (which was always
screwed in to the radio) and pushed it in and out a
bunch of times.  There seemed to be some mild coating or
corrosion or whatever on the pins.  Taking off the connector
and moving it on and off cured the problem.  The problem
only happened every eight months or so.
NOW,  Maybe the same thing is happening to your F6A's
battery contacts and they needed to be scrapped "clean"
so to speak.  This might explain the different resistance?? 
Hey, you never know.  Also, I don't think keeping it plugged
into the charger all the time is a good idea.
Just my .04 cents (inflation)

73,  Mark  N2FLF
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x509v3 wrote:

If I read about this story in this group, I wouldn't have believed it. But it happened to me
and I wanted to share. Has anyone else seen this?

I have a 2-year old TH-F6A that sees very light use. It's extremely well cared-for, it
spends most of its time plugged into its stock charger waiting for an emergency or the
weekly net. The radio hasn't been modified in any way and I'm only using the stock
Lithium battery and charger.

Yesterday I unplugged it from the charger to use it on the weekly net and ... it didn't
power on. If I plugged it back in to the charger, it would power up. Removing and
reinstalling the battery didn't help. Switching batteries from my wife's F6A didn't help. My
battery on her HT worked fine, so I confirmed it wasn't a battery problem. I tried doing a
full reset on my HT and that didn't help either.

I left the unit unplugged and uncharged all day. When I came home from work and tested
it, the unit would still not power on when powered from battery.

Using a DVM I verified that the battery was properly charged. I also tested the resistance
across the HT's battery terminals on its back case: 230 KOhms. I compared this value to
my wife's (working) HT: her's read 24 kOhms. I double-checked the results.

I then installed the battery on my HT and .. it powered up!

I then tested the resistance of the same terminals on my HT and they were 24 kOhms.

What does this mean? I have no idea.

At first I assumed that a fuse may have given out on my HT, but after seeing the difference
in resistance values between a working and non-working unit, that's clearly not what
happened.

I've had this radio fail to powerup one other time in the past 2 years but I seem to recall
that simply removing and reinserting the battery fixed it last time.

So, if this happens to you, you might want to unplug your HT from everything and briefly
test or short out the terminals on the back of the radio to drain it of some sort of residual
charge.

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