Hi All,
I've taken apart a couple of these printers for this purpose. There is no obvious battery (coin cell, etc) on the main logic board or the digital board. There are lines from the digital board to the cart labeled sda sclk, along with what I would guess is a ground, and a connection that appears to not be connected.
Best,
-Ozz
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RE: [Homebrew_PCBs] Re: Pantum 2500 hack to direct print toner rolling date back and page counts
2016-11-04 by yahoo@...