I've got two Panasonic EY6407 12V Ni-MH cordless drills, five EV9200
12V 3.0 ah
batteries and THREE EY0230 7.2-15.6V chargers. The drills were bought
three years apart 2000 and 2003 each with a charger. The third charger
was bought in 2005.
All three chargers appear to have croaked - at the same time and I've
now got five dead battery packs.
They were all plugged into outlets on two different 110VAC circuits in a
branch breaker box fed from the main breaker box's 30A 220V breaker.
One leg of that 30A 220V breaker wasn't properly seated on it's bus bar
when it was installed by a licensed electrician and inspected by a
county electrical inspector. That breaker has not tripped since it was
installed in 1999.
About three months ago, the 110V outlets for my JET mini/midi lathe
acting up - variable speed changing speed without my touching its
controls, 40 Watt fluorescent task lites flickering - then the quad
outlet went dead.
Backing up checking for presents of power - at upstream 110V outlets,
then to legs on the breaker on that circuit breaker and finally back to
the main breaker box.
When that turned no power back to the main breaker box I pulled the 30A
220V breaker. One leg on the breaker, and its contact on a bus bar were
visibly burned. Turns out a piece of the plastic case on the back of
the breaker apparently broke when the breaker was installed - and kept
one leg of the breaker from fully seating properly on the bus bar.
So I break out the VOM, plug a charger in and start reading voltage
between the 5 contacts labeled S, +, K, -, -
Black lead on first contact, Red on the Second contact
S to + -0.08
S to K +0.25
S to - -0.25
S to - 0.00
+ to S -0.06
+ to K -0.32
+ to - -0.34
+ to - 0.00
K to S 0.00
K to + +0.24
K to - -0.01
K to - +0.20
- to S +0.20
- to + +0.22
- to K 0.00
- to - +0.19
- to S 0.00
- to + 0.00
- to K 0.00
- to - 0.00
Get no lights on the charger when it's plugged into a verified
110V outlet, no lights when a battery is installed for charging.
Can't get into the charger case because they used star screws with the
a "finger" in the middle. I've got a bit that would fit the screws -
they buried the screws at the bottom of an inch and a quarter hole.
Did the breaker problem fry all three chargers?
You'd think they'd put in some type of circuit protector in these