Cal. 7D56A
40/44
Technical guide
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Inspection method of perpetual calendar
1. With the back case temporarily closed, recharge the watch until the amount of stored electrical
energy in the rechargeable battery reaches above 1.3v.
2. Pull out the crown from the “0” position to the first click position, and leave it as it is for two sec-
onds 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 within one second.
* Setting the date to December 30th and carrying out this operation allows for a check of the year,
month and date change.
3. Check that the calendar automatically advances by “four days.”
* If carrying out this check continuously, carry out re-checks at an interval of one minute or longer.
Note that this is structured not to be electrically checked continuously.
4. Pull out the crown to the first click position and set the date to a non-existing date.
* February 30th, and 31st day of a shorter month
5. Push the crown back in to check that the date automatically changes to the “First day” of the next
month.
6. If it does not automatically advance, carry out the procedures from 1, and if it still does not
operate, overhaul the calendar assembly part.
(Note)
* Be careful not to pull the crown out to the second click position. If you have pull out the crown to
the second click position, again carry out the procedures from 1.
* Be careful not to damage the crown.
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