NEWS

05/23/2019
NEWS
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


SATELLITE WAVE GPS Cal. F990
                                
          CC7005-16E           CC7005-16F           CC7005-16G


SATELLITE WAVE GPS Cal. F950
                                           
          CC4004-58E           CC4004-58F           CC4000-59E           CC4000-59L


How to determine the case number and serial number
SATELLITE WAVE GPS F990 SATELLITE WAVE GPS F950
     SATELLITE WAVE GPS F990           SATELLITE WAVE GPS F950      
 

Applicable Case Number and Serial Number


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

Applicable Case Number
F990-T024602 / F990-T024629 / F990-T024611
F950-T024521 / F950-T024548 / F950-T024530

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.)