My casio spf 70 writes ''open'' and does not complay at any order.it just shows time.

SOURCE: Casio spf 40 Module 2273

Your Watch is in Auto or demo mode. Hold down the "Mode" button for 3 - 5 seconds and it will return to time keeping mode.

Cheers,
Murray

SOURCE: casio pathfinder SPF 70-s titanium band adjustment

I purchased a Casio Pathfinder solar/atomic watch, with compass, altimeter, barometer, thermometer, model 1200T-7WC (titanium).
Has the titanium band - on this particular band each link is somewhat waveshaped {i.e., there are 2 "arms" from the link making contact with the middle part of the link above (above meaning towards the watch body), and 1 arm fitting between the 2 arms of the next link down). Unlike described in the first solution, the pin is not split, but solid (doesn't look like a slotted screw on 1 end, so the solution at http://www.wikihow.com/Adjust-a-Casio-S-935L-Watch-Band is no help). Here's what to do if you have this band:

1. Note: before you start, be advised there is a tiny loose 1/8" part (sleeve) that will fall out as you pull the links apart, so work over an appropriate surface to "catch" it. Push pin (from the upper "arrow end) of one of the removeable links (those with the arrows on the backside) out of its hole with a fine poker (I used a 1/32" jeweler's screwdriver, an unbent paperclip would also work, just more likely to bend as you push pin out). This takes some force to do - in my case, after pushing, the pin projected out about 1/2 of it's length, I used needle-nosed pliers to gently pull it out the rest of the way). CAREFUL - once pin is removed and you pull the link away from the one above, a small (1/8") constriction sleeve should fall out of the center arm of the link above. SAVE THIS SLEEVE!

2. Using the same procedure, remove the pin from the bottom end of the link you're removing. again, SAVE THE SLEEVE.

3. to rejoin the band once the link is removed, look at the single/middle "arm" of the upper link, looking for the hole where the pin goes through. One side of the hole should be noticeably larger/wider than the other side - this is where you will place the SLEEVE - I used tweezers, or needle-nosed pliers will work - it will drop into hole. Keep this upright so that sleeve doesn't fall out, and slide the 2 arms of the lower link in place around the center arm.

4. Slide the pin you removed into one of the outer link arm holes - I found it easier if I started from below, pushing it into the center arm - it will stop when it reaches that 1/8" constriction sleeve. I set the extruded end on the pin on a magazine (i.e., slightly padded surface) and then pushed the top side of the band down, forcing the pin through the constriction sleeve and up into the upper arm hole, and Voila, your band is reconnected. The sleeve is important (without the sleeve in place, the pin will simply fall back out).

SOURCE: I have 2 CASIO Sea Pathfinder titanium watches.

Goto http://www.casio.co.uk/Support/Services/, they should be able to advise you.