United States v. Bailon-Santana, 429 F.3d 1258 (9th Cir. Dec. 6, 2005) (conviction vacated due to invalid jury waiver where the district courts finding that defendants lawyer properly translated a jury trial waiver form was not supported by the record).
http://caselaw.lp.findlaw.com/data2/circs/9th/0450079p.pdf