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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: Argus on February 09, 2008, 11:01:54 AM

Title: Bridgeboard Battery Problem
Post by: Argus on February 09, 2008, 11:01:54 AM

I have an A2286 BB which I had been using with Etherbridge quite nicely for a while.  Recently, the BB fails with the message '-Battery failure'.  It seems naturally that the CMOS settings are lost with a dead battery.  Anyway, what kind of battery does this baby take.  The original is a black square one.  Would a lithium coin battery hack work?

Title: Re: Bridgeboard Battery Problem
Post by: Braddo on February 09, 2008, 03:09:42 PM

I don't think you could go wrong by hooking up a 3v battery and trying it.

Title: Re: Bridgeboard Battery Problem
Post by: rkauer on February 09, 2008, 07:11:16 PM

Quote

Argus wrote:
I have an A2286 BB which I had been using with Etherbridge quite nicely for a while.  Recently, the BB fails with the message '-Battery failure'.  It seems naturally that the CMOS settings are lost with a dead battery.  Anyway, what kind of battery does this baby take.  The original is a black square one.  Would a lithium coin battery hack work?

 Yes, that lithium hack works, if your battery is one rechargeable 3.6V.

Title: Re: Bridgeboard Battery Problem
Post by: DaBest on February 09, 2008, 07:44:32 PM

Never knew it had a battery ....sheeeesh :-D

Title: Re: Bridgeboard Battery Problem
Post by: ChuckT on February 09, 2008, 08:13:11 PM

How much power does the board use?
What are the voltages of comparable size batteries?
What voltages do batteries for the PC use?
What battery did the A2000 use?

If you didn't know, would you be able to guess what range the battery would be in?

Title: Re: Bridgeboard Battery Problem
Post by: Computolio on February 09, 2008, 08:38:33 PM

    The CMOS battery is an extremely common Dallas powered SRAM chip. They can be found on just about any PC motherboard of the same era. Failing that, brand-new spares are pretty easy to come by.

    It's probably soldered in, though, so you're going to want to add a socket.

Title: Re: Bridgeboard Battery Problem
Post by: da9000 on February 11, 2008, 07:25:34 AM

Is the battery the U59 (or was it U51?)?

Title: Re: Bridgeboard Battery Problem
Post by: banzai on February 12, 2008, 04:29:49 PM

According to the picture (http://amiga.resource.cx/photos/a2286at,A2286-sandwich), it's a Dallas Semiconductor DS1287 (the thing in the top left corner with a picture of a clock on it). This was a common chip in the day, and uses an internal 3V Lithium battery (but not the standard CR-2032 type).

I've taken apart one long ago, and found that you could pop the top cap off (don't know if Dallas allows this), unsolder the old and re-solder the new one, then snap the cap back on. If you look at the back of the "sandwich" board, you'll see that only a few of the pins are used, and two of these are for the battery, so they don't get "pinned-out" to the PCB.

I suppose you could rig up the 2032-type battery to it, but it may be too large to get the cap back on (some hot glue can take care of that problem). You could get another 1287 to replace it, but you'd have to be careful soldering, and there's no gurantee that the new one's battery hasn't died, too.

banzai

Title: Re: Bridgeboard Battery Problem
Post by: ChuckT on February 14, 2008, 05:28:33 AM

http://amigakit.leamancomputing.com/catalog/advanced_search_result.php?osCsid=e5f8028cb823d1eed73ad7f4b4aeddad&keywords=battery

I think Amigakit has a comparable battery.  Have a nice day.

Amiga Kit (http://amigakit.leamancomputing.com/catalog/advanced_search_result.php?osCsid=e5f8028cb823d1eed73ad7f4b4aeddad&keywords=battery)