l
Names of the parts for regulation and their functions
[STUD SUPPORT]
Correction of the beat error
by positioning the roller jewel
correctly
[REGULATOR]
Regulation of the accuracy rate (+) or (-)
by adjusting the operative length of the
balance-spring
[STUD (glued at the balance-spring)]
Alignment of the balance-spring to the
center of the regulator pin's slit
[REGULATOR PIN]
Adjustment of the play of the balance-
spring embraced in its slit
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How to regulate the isochronism fault by adjusting the position of the balance-spring
This caliber has the Etachron system for fine regulation of the isochronism fault, which is the same
design used for both Cal. 7S-B series.
Wh
en an amplitude of the balance becomes weak, the watch shows time loss, in general.
By making a clearance of the balance-spring smaller, the decline curve of the instantaneous rate
gets shallower.
1
) Make sure that the REGURATOR PIN is aligned in a vertical position to the REGURATOR and the
balance-spring passes parallel through the slot of the REGULATOR PIN before fine-tuning the STUD
and the REGULATOR PIN.
REGULATOR PIN
top side view back side view
angled view
1
2
3
4
1
2
3
4
2
REGULATION
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