Perpetual calendar date and day of week out of sync

[nicholas421]

When I set the correct date on my IWC Novecento, the day of week is incorrect (behind 1 day).

According to the manual:

"The entire calendar is set automatically. There is no need for you to know whether you are in a leap year or what phase the moon is in. Even the day of the week requires no setting."

There is no mention of the day of week getting out of sync in the manual.

Any advice?  Thanks!

[jdm]

13 hours ago, nicholas421 said:

"The entire calendar is set automatically. There is no need for you to know whether you are in a leap year or what phase the moon is in. Even the day of the week requires no setting."

That assumes the watch is run continuously, and if is stopped for any reason, time is patiently advanced until it catches up with the current time and date. Letting aside that IMHO the above is not something which any owner will want, how the problem has happened? Has the watch been stopped, or it has happened suddenly? Since it seems there is no user accessible calendar reset, the next step could have to be an official IWC service center or an equivalently reputable specialist watchmaker. 

[JohnR725]

Normally with perpetual calendars we would be talking about a quartz watch. All the hands are independent stepping motors. If the watch stops like the battery dies you don't change it fast enough the circuitry loses track of where all the hands are. Then there's an elaborate resetting procedure to get everything back the way it's supposed.

Except this is not a quartz watch.

13 hours ago, nicholas421 said:

IWC Novecento,

I looked this up its mechanical and it's not cheap.

The problem with the watch like this is I don't think really get a repair manual. Even if we had a repair manual I doubt we get a spare parts. As it's entirely mechanical if it's not working it goes back to the factory or an authorized service provider.

 

[nickelsilver]

I agree with JDM, this will need to see a watchmaker (who is familiar with this watch, or go to IWC directly). These account for the specific year, so the fact that it's off on the day probably means the day didn't jump once. I haven't been inside one of these but plenty of other perpetual calendars; I think this one would be challenging to tackle without some prior experience. It could be that with the movement out you can just nudge the hand forward, far from midnight, in most cases that would simply jump the hand forward and then you're back on track. But I would bet this hasn't been serviced since new, that's a long time for a watch to go without service.

[WatchMaker]

Only to reinforce what has already been said:

https://www.watchprosite.com/wristscan/iwc-novecento-perpetual-calendar/1036.1158796.9097141/

Your watch dates from the 1990s and it doesn't look like IWC have altered the situation for their updated and latest perpetual calendar movements. As per instruction manual:
You must not move the calendar beyond the correct date. The complicated movement is mechanically programmed and cannot be moved back in time without making a professional adjustment to the movement. However, if you do move the date forwards beyond the correct date, you have two options: You can either pull out the crown to position 2 to stop the movement until the calendar setting matches the correct date once again. This makes sense if the date has been set only a few days ahead. Or, you take your watch to your watchmaker, who will be able to adjust the movement to reset the calendar. This is recommended in the event of larger maladjustments.

[clockboy]

Perhaps a way to rectify this would be to advance the hands until the date and hands are correct then remove the other hands that are not correct and re-fit them into the correct position. 

[jdm]

55 minutes ago, clockboy said:

Perhaps a way to rectify this would be to advance the hands until the date and hands are correct then remove the other hands that are not correct and re-fit them into the correct position. 

Doing it this way it could be enough to refit the day hand forward one day. Then  check the moon phase and the date again on the next month. I find it weird that it got unsynced unless it has been manipulated somehow.