Cal. 7D56A
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Technical guide
Cal. 7D56A is equipped with a perpetual calendar which automatically advances the calendar up to
February 28, 2100.
Here, an inspection is carried out if the “perpetual calendar” normally operates.
Note:
This inspection cannot be made when the watch is stopped. If the watch to be inspected has
stopped, start the inspection after the second hand starts moving at 1-second interval by manu-
ally charging it and the amount of stored electrical energy reaches above 1.3v.
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Inspection method of PTP operation in move state
1. Recharge the rechargeable battery until the amount of stored electrical energy reaches above 1.3v.
2. After tightening the SCREW FOR PIEZOELECTRIC MOTOR COVER, pull out the crown from the “ 0”
position to the first click position and leave it as it is for two seconds or longer. Then, “Pull the
crown out and push it back in the order of the “ 0” position, first click position, “ 0” position, first
click position and “ 0” position, and return it to the normal position. Carry out this operation with-
in one second.
3. Check that the piezoelectric rotor rotates smoothly. (Normal operation)
If it rotates smoothly, PTP operation is normal.
Click photo and you can see the movie.
4. If it does not rotate smoothly, carry out the procedures from 1, and if it still does not rotate, over
-
haul the calendar assembly part.
* Be careful not to pull out the crown to the second click position.
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Inspection of perpetual calendar and PTP operation in move state
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