10.To wind up the mainspring
<<Movement>>
Screwdriver winding … Turn the ratchet wheel screw 8 times clockwise.
Screwdriver
Ratchet wheel screw
Ratchet wheel
11.How to attach hands
Place the movement directly on a flat metal plate or something similar to attach the hands.
Static weighting
We recommend the use of movement holder to attach hands.
For hands attachment, please use a special equipment.
When the movement receives a strong shock, it may be damaged.
<<Note: Power reserve hand setting>>
(1)The mainspring should be fully wound up before setting power reserve hand.
(2)Set power reserve hand at the fully wound up position of the dial graduation.
Fully wound state
[ Hand setting position ]
Auxiliary main plate pin
Not fully wound state
[ Image design ]
12.Accuracy measurement condition
Static Accuracy : -15~+25 seconds per day
Measurement Conditions
1) Measurement should be done within 10~60 minutes after fully wound up.
2) Lift angle : 52 deg.
3) Measurement position : (1) Dial up (2) 9 o'clock up (3) 6 o'clock up
4) Minimum measurement Time : 20 seconds
5) Stabilizing Time :
Leave the watch for at least 20 seconds to stabilize after you change its measurement position.
[ Screwdriver winding ]
TECHNICAL GUIDE
Setting position
of power reserve
hand
Intermediate power reserve wheel
SII Products
13
Version-03
Cal.NE20C
The mainspring would be fully wound up by turning the ratchet wheel screw 8 times clockwise. (Manual winding or Screwdriver)
Manual winding … Rotate crown clockwise at normal position by minimum 55 times. (Equal to ratchet wheel screw 8 times )
[ Manual winding ]
[ HOW TO CHECK ]
Metal plate
Enlarged
view
