ETA 7750: Part 1 - Disassembly
Автор: Stuart Stakoff
Загружено: 2020-03-14
Просмотров: 39709
Disassembly of a Tourneau ETA 7750 Chronograph Movement. This watch was having issues with intermittent stopping. Also, the day indicator on the watch was not aligned correctly in the day window.
16-Mar-2020: Some notes and corrections based on feedback from user CaptCalvin on watchrepairtalk.com.
05:50: It can be seen that the dial washer, or indicator distance piece, is missing
10:57: I incorrectly show how to orient the day/date driving wheels. The day wheel is correctly shown aligned to the mark on the movement plate. But the date wheel should be pointed at the post of the intermediate date wheel, not the cannon pinion. The intermediate date wheel sits between the day and date driving wheels.
20:27: The lock stops the movement of the chronograph seconds wheel - not the minute counting wheel
25:09: CaptCalvin suggests not removing tension from the cam jumper in this fashion. He suggests leaving the jumper in place and removing the cam screw. You should be able to maneuver the cam away from jumper easily. You can now remove the jumper. I will try this technique next time.
31:02: The fourth wheel appears to have been replaced, most likely with one from a Chinese clone such as from Dandong.
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