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Mac Plus – Clock and Settings Don't Keep After Shutdown


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Hello – I have a Mac Plus that won't save any settings, such as the time, date or mouse tracking. I replaced the PRAM battery on the back of it with a new one, but it still won't maintain it's internal clock after I shut it down for the night. What could be wrong? Is there something on the logic board that could have gone bad? It's not the end of the world, but it's annoying and I'd like to find out what it is.

 

Thanks.

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Yes, the battery is a type 523 4.5v. It's the one in the attached photo. I got it from Amazon: http://www.amazon.com/gp/product/B005AW9YGE/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1. I know the battery is good because I checked it with a voltmeter.

 

I'll have to take a close look at those contacts.  If that seems fine, is there anywhere else that I should Iook?

 

Thanks for the suggestions.

post-3966-0-76437700-1425512979.jpg

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You may need to crack the case, and use a multimeter. 

 

Have the battery installed, Then meter the voltage from the analog board, and trace it through. if it stops at the solder joint where the battery holder is, Then you know its the holder. But if its good, follow it through to the logic board. its being lost somewhere. 

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So it looks like the upper contact has a fair amount of corrosion. You were all correct! I tried cleaning it but it still doesn't seem enough – the date still isn't saving. What's the best way to clean them up? Tips? I'd like to make sure this isn't the issue before taking the next step. My multimeter skills don't extend too much beyond checking batteries. :I

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