[ICOM] IC-2AT BP3 battery pack

[Richard Keller]

Thanks Gary. This indeed helps.

I guess I was not clear since some of you thought I was
referring to the radio or a different battery pack.  This
pack is 8.4VDC with 7 NICADS (1/2 size) and a circuit board
with 5 diodes, 2 transistors, 2 resistors, 1 red LED and 1
electrolytic cap. There is nothing wrong with the radio.
Battery voltage appears on the end screws but not on the
contact which mates with the radio source voltage input.
This is supposed to be an original BP3 pack, not a mod. The
SK I got it from 13 year ago hardly even used it.

Thanks for all the responses and I now can see if the board
is repairable of if I will just remove the circuit board and
install larger batteries as one suggested.
73, Dick KF4NS
St. Petersburg, FL 33714 USA
Keep the glow!



| Message: 8
| Date: Sun, 10 Jul 2005 17:56:33 -0700
| From: Gary Fiber <gfiber at comcast.net>
| Subject: Re: [ICOM] IC-2AT BP3 battery pack
| To: ICOM Reflector <icom at mailman.qth.net>
| Message-ID:
<6.2.3.4.2.20050710175022.02156770 at mail.comcast.net>
| Content-Type: text/plain; charset="us-ascii";
format=flowed
|
| Dick,
|
| So far as I remember the battery supplied directly to the
terminals
| and did not go through any semi conductors. The
semiconductors were
| used for recharging the battery but out of circuit when it
was
| suppling the 2AT. Probably what you will find is an open
ground. Look
| on the circuit board for a burned open or corroded away
ground trace.
|
| I also remember Icom used in some of the other batteries
of that
| series a small fuse between two posts in reality it was a
piece of
| about # 22 wire. We used to use one strand of 16 gauge
stranded wire.
| We removed the insulation and then unwound one of the
several strands
| and soldered that between the two posts. Another way might
to replace
| that fuse with a Pico fuse.
|
| Icom tech support should have a schematic of the battery
pack
| available but not likely the circuit board layout. A CM3
and BP3 were
| the very same battery.
|
| Gary K8IZ
|
| At 01:26 PM 7/10/2005, you wrote:
| >After all these years my 2AT quit. Found out that the
battery
| >is good but no voltage on the pack plus contact. No
| >schematic for the pack charger circuit but traced the
| >voltage to the base of the switch transistor A1048 and it
| >stops there. Charger works. Voltage is fine at the end
| >terminals so trouble is definitely on the circuit board.
My
| >guess is the A1048 transistor (good logic, huh?!) and
cannot
| >find a x-ref other than NTE2036 which Mouser says "not
| >found" so who has an idea?
| >
| >A copy of the schematic would help. If anyone has a BP3
pack
| >with dead batteries I would purchase the pack for the
| >circuit board if price is reasonable.
| >73, Dick KF4NS
| >St. Petersburg, FL 33714 USA
| >Keep the glow!
|
| Gary Fiber K8IZ
| GROL PG-19-6691
| Washington State Resident
|