Me noted the SAME ISSUE with the GST B100 1A. Sometimes, upon waking up from power saving, the second hand or minute hand moved in a very rough way especially when moving backwards. Amd sometimes the turbine blade rotates, sometimes no. Really clueless, as Casio does not mention clearly when the turbine blade will turn.

The vibrating minute hand occurs during World Time settig too. Thought it was normal?

 

It might also be that it's shaking while going counter clockwise, but I haven't tested it much since I only just thought of that.

 

On my analogue G Shocks, the minute hand moves in 20 second increments. So when its moving fast it could look like its vibrating.

 

U can actually see the "vibration" when the minute or second hand moving backwards. Thought this was normal as nobody seems to mention. I guess Casio really leeave many mysteries for buyers to find out.

 

Now that u mentioned, noted the Indicator Mode hand vibrating while rotating backwards showing the modes. My MTG B1000 1A.

 

Typically quartz watches use a lavet stepper motor, these are designed to only turn in one direction, and can't be reversed, and their movement can't be smooth because of the way they work. They flip 180 degrees at each pulse quickly, then move a little bit again under the influence of a permanent magnet when the power from the magnetic coil is removed so they are positioned in such a way that the next pulse pushes them around in the same direction. So when moving quickly it may not look very smooth, as it isn't a smooth motion and could resonated the hands.

I don't know how Casio reverses the hands, they may use an electronic trick with the lavet stepper motor to get it to run in reverse, this would be even less smooth, or there is a gearing change or a different motor kicks in. Either way the watch will be set up to move as freely with as little friction as possible in the clock wise direction, and going backwards would likely meet with some extra resistance in the gears, so might look worse then the forward movement. Think how different a car sounds going in reverse.

 

So this "vibration" is considered as normal?

 

I've just bought a Casio GA 2000S 1A and my hands work perfect in clockwise motion but in anticlockwise it is half the speed and the hands vibrate/shake a lot. Surely it can't be right.

 

My MTG B1000 1A showed the same symptoms, unfortunately. We are waiting for the vaccine.

 

It's normal, the reverse direction isn't necessarily going to be smooth as everything is set up for a normal clockwise direction. You can see the same thing in this video, you can see it is juddering in reverse. It is just the way Casio have implemented reverse on these watches.

 

Damn, Casio should have put this in the "FAQ" section of the manual!! Never thought buying a watch could lead to so many questions-real stressful!

 

Glad I could create the most stressful thread of that day