[S-4800-list] track ball of SEM

[Jiayi Shao]

Hi, All, 

The track ball of s-4800 SEM only has one direction movement now. I re-connect & connect the track ball cable several times, and can dot solve this problem. I will ask the service engineer ship a new track ball to us as soon as possible.

By the way, if you put the X-position & y- position of specimen by keyboard, the sample stage moves properly, and the SEM is operational.

Jiayi