I have a Sector 900 chronograph wristwatch. Sometimes, after using the chronograph and resetting it to zero position, the hand (large one) does not go to zero (position 12) but stops at e.g. minus 8 and then next time starts from there. I brought the watch back once and it was fixed in an instant. I have the same problem sometimes with another chronograph (not sector) and they explained to me that it can be easily done by myself, to reset it. Does anyone know the combination of keys etc to do so?

SOURCE: SECTOR CHRONOGRAPH 200 WATCH

That's easy. You need to calibrate it. In normal time mode, pull the crown out all the way and then use the pushers to step it back to the zero position. When finished, push the crown back in. You can also calibrate the sub-dails in a similar fashion.

SOURCE: sector 255 need to contact sector

need help in setting time on sector 550 2653955025.

SOURCE: Sector 250 Chronograph Alarm

the middle dial on the right side of the watch is used to switch from watch settings to alarm settings..
pull the middle dial out to put it in alarm mode.
To set alarm:
-pull the center knob out.
-with it out you can now use the bottom (right) knob to set the alarm.
-pull the bottom right knob out one notch
-turn the knob clockwise or counter clockwise to set the alarm time
-push the knob back in (all the way)

the alarm is now set

if the center (right) knob is pulled out the alarm is ON
if the center (right) knob is pushed in the alarm is OFF
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I have owned this watch for about 10 years now and love it.
the past few years the chronograph buttons (on the left side of the watch) were not working well rendering the chronograph and count down timer functions unusable.

repairing a chronographs is expensive and watch makers usually charge several hundred dollars which is not a feasible fee for a watch of this value so i decided to open it up my self and clean it up and that did the trick.. its working like new!

enjoy the watch!

SOURCE: Sector adv 1000 setting alarm

key for setting time can be pulled fully (to set time) or shortly (only 0.5-1 mm) for setting alarm. then you should turn it and watch how it moves (automatic, without your turning). when it comes to desired time just push key in. the watch will automatically rewind to present time and it will re-start running.

SOURCE: Just had battery changed in my Tag chronograph.

I love these watches, don't you?