Seiko 7B27 - Handling Abnormal Watch Behavior; Resetting the Watchs Internal IC; Detailed Product Specifications; Core Watch Functions and Performance Specs






In case of an abnormal movement


1.

3.

■ How to reset the built-in IC
 

  



1.
Pull out the crown to the second click.
 
2.
Keep pressing down Button A and B at the same
time for 3 seconds, and then release them.
 




3.
When all the hands stop pointing to 12 oclock
0 minutes and 0 seconds, push the crown back.
 
  

    
   
      
ButtonA
2. Pressfor
3seconds
ButtonB
2. Pressfor
3seconds

3.
1.
1. Basic feature ����������������� Basic watch with three hands (hour, minute and second hands), date display
2.
Frequency of crystal oscillator ��� 32,768 Hz (Hz = Hertz ... Cycles per second)
3. Loss/gain (monthly rate) ����� Loss / gain ±15 seconds on a monthly rate (Except the case when the watch is
used without an automatic time setting by receiving a radio signal and when it is
worn on the wrist within a normal temperature range between 5℃ and 35℃).
4.
Operational temperature range ��� Between −10℃ and +60℃
5. Driving systems �������������� Step motor (Hour and minute hands, second hand, and the date)
6. Power source ���������������� Secondary battery, 1 piece
7. Duration of operation ��������� Approximately six months (Fully charged, and the Power Save is not activated).
※ If Power Save is activated after it is fully charged, the watch continues to run
for approximately one and a half years at maximum.
8.
Time setting by receiving
the JJY-LF radio signal
���� Automatic reception (before 2:00 AM, 3:00 AM and 4:00 AM)
※ Reception attempts depend on the radio signal receiving conditions.
※ After having received a radio signal, the watch will start to move depending on
the quartz movement until the next reception.
※ Manual reception is also available.
9. IC (Integrated Circuit) �������� Oscillator, frequency divider and driving circuit C-MOS-IC, 3 pieces
 
Specications