Updated: Jan. 21, 2019
Casio has a telephone hotline in Japan for questions (in Japanese only) about camera repair:
0570-004161 (Alternate number: 042-560-4161)
Operators are on duty Mon. to Sat. from 9 am to 6:30 pm. Closed on Sun. and national holidays.
Direct phone numbers to their service stations are listed below. The hours are usually from 9 am to 5:30 pm. Closed on Sat., Sun., and national holidays. Click on the links for the respective map and address in Japanese. The Akihabara, Osaka, and Fukuoka Service Stations offer a quick repair service for minor camera repairs completed within an hour.
Tokyo (Akihabara): 0570-004161
Yokohama: 045-680-1230
Nagoya: 052-324-2151
Osaka: 0570-004161
Hiroshima 082-504-8012
Fukuoka: 092-411-2538
Sendai: 022-256-8822
Sapporo: 011-281-1231
Casio Service Stations in Japan listed in Japanese here:
https://members.casio.jp/jp/support/repair/22_2.html