"As is" is not used (or even needed) in the Chinese translation. Its main use is to make clear that there is nothing left vague (for instance, no questions asked to keep readers hanging in mid-air) or unclear and nothing is implied.
If one must do something to the "as is," I suggest Pingpu Zhishu. (meaning, no twists and/or doubts have been introduced).

对于实物，"as is"指其目前现状。对于文字内容，似乎应该是按字面含义，不带明示或暗示。

Information used in this manual is CITED "as is" and we do not guarantee in any way, expressly or implicitly, the accuracy of the same.

The author is not very careful with his writing. Based on the whole sentence, the "information" here is actually cited information from other sources, not directly from by the author himself. What he is trying to say here is the information used is cited from other sources and he does not guarantee the accuracy of the cited information.

So the sentence can be translated as:

本手册中所使用信息为“原样引用”，我们对其准确性不作任何明示或暗示保证。

English term (edited): the information in this manual is provided \"as is\" and without warranties of any

如上