Breitling: Cal. ETA7750
Symptoms: Immobility (spring broken)
Repair contents: Overhaul, spring and gasket replacement, case cleaning
Repair cost: 33,000 yen
This is a Breitling Navitimer. The movement is based on the ETA7750, but the structure is the same.
Disassemble and clean, then reassemble.
The spring was broken, so I replaced it and reassembled it. The spring is a consumable item, so it will break when it breaks. Sometimes you can tell if it's broken by disassembling the barrel (the part that holds the spring) and taking out the spring, but you can't tell when you're using it.
The chronograph mechanism has been assembled.
There were no other parts that needed replacing, so I assembled it in the correct order. Chronographs have buttons in addition to the crown, so they are not very waterproof. Even models with a pressure of 10 atmospheres can still get moisture inside, so be careful of water and sweat.
This is the back side.
This movement may also malfunction if you fast-forward the calendar between 9:00 and 3:00. We recommend that you check the time first and then adjust the date.
Install the dial and hands.
The chronograph should be installed so that the hands do not touch each other and are as centered as possible.
After casing, we will perform a running test. Since parts for ETA-based movements are available, repairs can be done at a low cost. We hope this will be helpful for you when deciding on repairs.