Display And Crown/Button Operation; How To Set The Time; How To Set The Date - Seiko 8R48A Technical Manual

TECHNICAL GUIDE
Chronograph second hand
Hour hand
Chronograph Minute hand
(Measure up to 30 minutes)

1. How to set the time

1) Pull out the crown to the second click position.
2) Turn the crown to set hour and minute hands.
(Check that AM / PM is set correctly.)
3) Push the crown back into the normal position.
Note:
During time setting, if the chronograph is started, chronograph hour and minute hands will rotate simultaneously.
This is not a malfunction. Please reset chronograph by pushing button B.
Chronograph hour and minute hands will return to their reset position.

2. How to set the date

1) Pull out the crown to the first click position.
2) Turn the crown to left for date setting.
* Do not set the date between 8:00 P.M. and 2:00 A.M. as this will cause a malfunction.
3) Push the crown back into the normal position.
3. To wind up the mainspring
1) Manual winding ... Rotate the crown clockwise at normal position.
• Fully wind up by turning the crown minumum 55 times.
• Fully wind up by turning the ratchet wheel screw 8 times.
It will start to move naturally shaking slightly.
2) To wind up with winding machine.
• Rotary speed
• Operating time
DISPLAY AND CROWN / BUTTON OPERATION
Chronograph Hour hand
(Measure up to 12 hours)
: 30 rpm
: 60 minutes
Minute hand
Button A
(Chronograph Start / Stop)
Small second hand
Button B
(Chronograph Reset)
23/24
Cal. 8R48A/8R49A
Second click
(Time setting)
First click
(Date setting)
Crown at normal position
(Manual winding)