How would one write "face up" (e.g. as an instruction on a copier)?
"Face up" in Chinese is 面朝上.





An example sentence:

Place your card face up on the table, please. 

请把你的牌面朝上摊在桌子上。 



面向上 is also OK. 





From the Japanese alternatives, perhaps the first one would be more intelligible in Chinese, but with 上 at the end of the expression.