Turn the printer on it's back and remove the plate on the bottom, the motherboard is inside.
You will need a security torx driver bit to undo the screws.
There is a mains voltage transformer inside - so don't go poking your fingers in there with it plugged in!
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gr5 2,243
There at least 2 versions of the S5 printer. If you have the oldest type with the robot on the side panels of the printer, you have an S5R1 please contact your reseller as there are deadly voltages easily accessed once you remove the bottom cover.
If you have an S5 with a big "U" on the side then you have an S5R2. Here are instructions for the firmware recovery procedure:
https://support.makerbot.com/s/article/1877434822572
click on the big blue button that mentions "S5R2".
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