I bought a s/h Contax ST the other day, and have worked out all the functions except one: setting the data back. I can set the current date and time on it OK, but when I fire the shutter, it reverts to 1st Jan 1994. Either there is one last keypress I'm missing out, or the back is faulty.

The date/timestamp facility isn't particularly important to me, but I could do with determining if it's at fault as I can get it repaired under guarantee.

As I don't have a manual, is there anyone familiar with this model who can tell me how the back should be set?