Powered up my TZ today and got the "Factory Settings Restored" screen and figured my batteries were dead on my Rottendog MPU. I bought this machine 6 months ago and it appears the MPU was installed in 2014.

Anyway, instead of having a remote 3 AA battery pack, it has a 3.6V lithium battery with leads soldered to both ends. I removed it and it read .140 volts, so I assume it is my problem, but I am now wondering why it had this battery instead of the battery pack listed on Rottendog website?

Should I replace the 3.6V Lithium or get a battery pack from Rottendog? If I go with the Lithium where do you find one with leads already installed on the battery? Thank you!

Hi Chris,

Thank you for the response. I attached some pictures of my board with revision and serial numbers. My board has two lugs on the center left side for the lithium battery with axial leads. Do the RD MPUs have the same problems as the original boards with diodes failing and draining the battery? If so, is there an upgrade/repair for the board I have?

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Thank you again The battery connection is the blue block on the left. I found a 3-AA holder from Digikey I could attach to the same leads, but if something is causing a drain I need to fix it. Is the NVRAM from pinitech a fix for depleting batteries? Which position is the Ram that needs replaced? Sorry for the dumb questions. I am new to Rottendog stuff.

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Ok, thank you. I also read that about the clock and that is not too big of a deal since I don't leave it running except to play.

Also, I believe it would be U8 instead of U6? I believe U6 is the game ROM. Did you also mean to say 6264 instead of 6324?

Ok, thanks. It is U8. Also, it is either at 6264 or 62256, but I am not sure what I have since the number on the RAM comes up as either one, lol.

I'm not sure which it is. I looked up the number printed on it U62256ADK07LLG1 and found listings stating it was a 6264 and another being a 62256. Is there a way to tell other than that?

Ok, or I could simply add a 3 AA battery holder where the old lithium battery was, correct?

Exactly, and this is why I am confused I guess, lol. I have read that a resistor and jumper is needed and others say, no it is drop in regardless of RAM installed and now reading that address bits need shifted. I may just go with the battery box for now until I can get and answer from RD. I appreciate all the input.

I will take it! I will send you a PM. Thank you - Merry Christmas!

NVRAM worked great - Thanks Pin_Guy! Happy New Year!