Question about Seiko SNA553 Alarm Chronograph

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Remove back fro wrist watch to change battery

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Generally Seiko uses a pop off back and a screw off back. The pop off back will be smooth and have no indication of how to come off. The screw off back will have several rectangular notches around the back where the prongs of a watch wrench fit.
Before you begin you should know that this watch is water resistant and sealed to 100m. This means you do not have the equipment to reseal the watch and you void Seikos warranty. Also, the titanium models are more difficult to seal the back because of the hardness of the steal and the powder coating. They generally require that you replace the rear seal to make the watch water resistant again.
To remove a pop off back use a watch knife and press it straight into the separation between the case and back. Do not use a sharp knife or widdle back and forth as this may damage the surface where the seal is or make burrs. Once you have driven the knife straight in you can move around the back repeating this until the back is completely off.
To remove the screw off back place the watch wrench in the grooves at 10, 2, and 6 o clock. Make sure the prongs are pointed inward toward the wrench the same direction to avoid slipping and damaging the watch. Turn counter clockwise until the back is off.
When taking the back off in either case you must be careful not to slip and scratch the coils or vital parts of the watch. These damage by touch and this will cause the watch to not work. Also, most chronographs require the watch be AC'd. The instructions for this are usually on the back lid of the watch or in the owners manual. If you make a mistake ACing the watch you can short it out or break the circuit board.
Because of the complexity of this seemingly simple task i recommend going to a watch maker/ technician to avoid complications that could end up costing you much more in the long run.

Posted on Sep 22, 2009

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Posted on Jan 02, 2017

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