Tokunaga on: Explanation about the two adjusters on the 7C46 movement

[Harry, Denmark]

Authored by Tokunaga
Question:

Could you explain the purpose of the two adjusters on the 7C46 movement?
One is marked + and one is marked -. How are these used to adjust the rate of the movement?


Reply:

The markings (+) and (-) are for the purpose of time accuracy adjusting.
It needs a special technique to do this, you can do the following process.

(1)Confirm the appropriate pattern to be cut over the antimagnetic shield plate.
   (-) pattern : to lose approximately 0.26 sec./day
   (+) pattern : to gain approximately 0.26 sec./day
(2)Take off the antimagnetic shield plate.
(3)Cut the pattern on the circuit block.
(4)Remove the sludge completely.


Ikuo Tokunaga




Ikuo Tokunaga
Picture credit: Seiko