Color Classic PRAM battery

[Cinan]

Hi all,

I have just acquired a Color Classic and thought I would take the PRAM battery out until I have time to clean up the machine in case it leaks. To my surprise when I opened it up it has this pin setup where the PRAM battery goes. Does anyone know what the 3 pins are for, I am assuming two would got to a +ve/-ve of a battery holder so not sure what the 3rd is ? As you see the one on the right goes through the board and is a bit corroded on the underside. The board looks clean otherwise. Next option is to trace whey go but thought I would ask the brains trust first.

 

[Cinan]

Sorry the one on the left goes through the board.

 

[mg.man]

I've seen both a header and a connector (like yours) on CC 'boards. The pin to the left is +V, and the one on the right (end) is GND. The pin next to it is probably also GND - since they appear to be soldered onto the GND plane. If you look further to the right (left on the underside), you'll see the through-hole for the GND pin of a battery holder.

What's interesting is that the "discrete" battery used in these with the header is 4.5V, whereas the typical (in holder) PRAM battery is 3.6V. As I mentioned, I've seen both on a CC 'board.