In 2019, Uncategorized

Important notice of software update notification for customers who purchased SATELLITE WAVE GPS F990/F950 model.

Thank you for your kind patronage of our CITIZEN product.

An unexpected phenomenon is confirmed for models with Caliber F990/F950. This phenomenon will occur if the result of “automatic leap second reception* ” is failed. While the watch is exposed under strong light in the daytime, this reception repeatedly activates until the reception result is successful. As a result, the battery may run out faster than expected.

Even this phenomenon will not affect the displayed time of watch or make the watch stop shortly, you are highly recommended to have the software updated so it can be used with confidence.

Please kindly contact the nearest CITIZEN Service Center if your watch model, case number and serial number are satisfied with the applicable scope in this notice.

*Automatic leap second reception
An automatic function that receiving leap second signal only takes place in June and December every year. The leap second signal is transmitted every 12 minutes, the reception result varies depending on the reception timing and reception environment.

Applicable Product


CC7005-16E CC7005-16F CC7005-16G



 CC4004-58E  CC4004-58F  CC4000-59E  CC4000-59L

How to determine the case number and serial number

Applicable Case Number and Serial Number

Please confirm “Case Number” and ”Serial Number” on the case back.

Applicable Case Number

Applicable Serial Number (*First 3 digits)
<Cal. F990>
871******, 881******, 891******, 8O1******, 8N1******, 8D1******, 911******

<Cal. F950>
891******, 8D1******

*If the identification dot mark is shown, the software of your watch has been updated and it’s unnecessary to update the software again.

Please Contact us

Please click here to contact us or contact the nearest CITIZEN Service Center in your location (please click here for the worldwide service center network.)

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