Subject: RE: radio won't power on via battery - how I resolved it.
Newsgroups: gmane.recreation.radio.hardware.kenwood.th-f6a
Date: 2008-04-24 19:09:21 GMT (24 weeks, 1 day, 10 hours and 55 minutes ago)
I have this problem on occasion. I have several battery packs,
and switching to another one always solves the problem. After periods of bafflement
I discovered that sometimes the battery doesn’t make good contact with
the radio. The problem, I believe, is that the two spring-loaded power pins in
the radio just barely reach the terminals of the battery pack. I found a
solution: I take the battery pack off the radio and whack it—terminal side—against
the table or some other hard object to push the internal batteries higher up in
the battery pack. Then I reconnect it to the radio and it nearly always works.
If it doesn’t I take it off and whack it harder! Eventually it has always
worked. Sometimes a brute force solution is the way to do. 
-Tim (N7VU)
From: TH-F6A-hHKSG33TihhbjbujkaE4pw@public.gmane.org
[mailto:TH-F6A-hHKSG33TihhbjbujkaE4pw@public.gmane.org] On Behalf Of x509v3
Sent: Wednesday, April 23, 2008 11:11 PM
To: TH-F6A-hHKSG33TihhbjbujkaE4pw@public.gmane.org
Subject: [TH-F6A] radio won't power on via battery - how I resolved it.
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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