TECHNICAL GUIDE
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How to regulate the isochronous fault by adjusting the position of the balance-spring
This caliber has the Etachron system for fine regulation of the isochronous fault.
The watch shows a gain trend as amplitude decreases and loses time badly near the end of its useful power reserve.
The isochronous fault can be adjusted easily by turning the Regulator pin to make the gap in the slot
either larger or smaller.
1) Make sure that the Regulator pin is aligned in a vertical position to the Regulator and the
balance-spring passes parallel through the slot of the Regulator pin before fine-tuning the STUD
and the Regulator pin.
REGULATOR PIN
2) Rotate the STUD in order to align the position of the balance-spring passes through the center of
the slot of the Regulator pin.
3) Rotate the REGULATOR PIN counterclockwise in order to fine-tune the clearance of
the balance-spring passing through the slot of it. Set it to moderate gap to get the stable trend.
REGULATOR PIN
Top side view
Back side view
STUD
Top side view
Top side view
13/16
Angled view
Cal.6R15A/B
(Maximum clearance)
(Minimum clearance)
Before rotating
After rotating
After rotating
Before rotating
Back side view
REGULATOR PIN
Back side view
