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TECHNICAL GUIDE
• The explanation here is only for the particular points of Cal. 4S77A.
I.
REMARKS ON DISASSEMBLING AND REASSEMBLING
How to install the hands
1
24-hour hand
Install the 24-hour hand so that its center is
positioned within the range indicated in the
illustration at right.
2
Date hand
Install the date hand so that its center is
positioned within the range indicated in the
illustration at right.
2
Day hand
Install the day hand so that the tip of the hand
is positioned within the height of the day marker
as shown in the illustration at right.
1.
Adjust the day hand until the end portion of the hammer
engages with the cam of the intermediate day driving
wheel in the manner as shown in the illustration at right.
2.
Install the dial.
* In doing so, take care not to move the parts from their
respective positions indicated in the illustration.
3.
Install the date and day hands.
In doing so, pull out the winding stem for hour hand
adjustment at the 2 o'clock side to the first click position,
and check that the day hand does not touch the dial.
4.
Pull out the winding stem at the 3 o'clock side to the second
click position, and turn it counterclockwise until the date
changes to the next.
5.
Install the 24-hour hand at the "24" position and the hour,
minute and second hands at the 12 o'clock position,
respectively.
8
Within 3° on both sides
of the center of
the hour marker
Within 3° on both sides
of the center of
the date marker
Cam of the intermediate
day driving wheel
Hammer
Checking hole of
the auxiliary train
wheel bridge
Checking hole of the auxiliary
train wheel bridge
Cal. 4S77A
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