Seiko H023 - Manual (Page 24)

English
24
C
D
If all indicators of the display light while in the
TIME/CALENDAR mode, it is not a malfunction.
This happens if Button C and D are pressed at the
same time during time setting. In such a
case,press any one of the four buttons to return
to the TIME/CALENDAR mode.
✩ ✩ When all indicators light ✩✩