This might help. You can zero each of the hands on the chronograph dials individually. Here's how it's done:
1) Make sure the chronograph is stopped.
2) Reset the chronograph with the pusher at 4 o'clock. If any of the hands aren't at their "zero" position they'll need to be adjusted.
3) Pull out the winding crown to the first position (date setting position).
4) Push the plunger at the 2 o'clock position. This will advance one of the chrono hands a step at a time. Stop it when the hand is at zero.
5) Push the plunger at the 4 o'clock position. This will adjust another of the chrono dials.
6) Pull the crown out to the second position (time setting position) and use the 2 or 4 o'clock plunger to adjust the final chrono dial.
One of the 4 possible crown/plunger combinations doesn't adjust anything. I don't have a chrono with me at the moment so I'm not sure which crown/plunger combination is the non-functional one. Anyhow, I hope this helps. Its quite common for Chrono's to go out of sync but the way to sort it tends to vary.
Clyde Hyland
I own a Tissot PRC 200 (steel bracelet, blue dial) I have owned it 4 years but the 1/10 second counter no longer resets into position. Despite resetting the watch, it still refuses to return into place. Functionally, it doesn't particularly bother me but its still annoying.
While I don't particularly like the idea of having it opened and "tampered" with because it was only serviced 9 months ago I am wondering what options I have.