Storing settings in a Mary Shelley's Frankenstein machine (SEGA)

[Paultje]

Hello,
I'm completely new to this forum, so I'm not sure how it works, but I have a question.
I have a Mary Shelley's Frankenstein Pin (SEGA and I am trying to set it to "Free Game"
This works when I leave the machine on. However, when I switch it off and then on again, it has forgotten that setting and I have to do everything all over again. Can anybody advice me on how to store that setting?
Oh, I forgot to mention: When I bought the machine, It WAS set to free game. And for a while it stayed that way. However, as I explained above, one day I switched it on and it asked me to open the coin door. From there, I understood I had to change the setting. The rest is history.
If somebody can advice me, I'd be very much obliged
Thank you

 

[Andydn]

There will be batteries inside the backbox that probably need replacing.

 

[Paul R Owen]

Lithiums are essential too.

 

[Paultje]

There will be batteries inside the backbox that probably need replacing.

Didn't think of that. Thank you!

 

[Paultje]

Lithiums are essential too.

Lithiums? Where are they located?

 

[Andydn]

Lithiums? Where are they located?

Lithium batteries as they are less prone to leaking

 

[Paultje]

Didn't think of that. Thank you!

Tried it. That was it! Thank you!

 

[Paultje]

Lithium batteries as they are less prone to leaking

Ah, ok, thanks you for the tip.

 

[Paultje]

There will be batteries inside the backbox that probably need replacing.

Tried it. That was it. Thank you!!!

 

[Andydn]

Tried it. That was it. Thank you!!!

Great news

 

[cmrl9]

Just remember to change the batteries once a year so they don't leak or fit a battery holder that off the board, however this would require a little skill and a soldering iron.

 

[Dovey79]

Or fit an nvram chip and never need any batteries