Steve, The atoclone must successfully reach its home position (Well A1) at powerup or nothing works. There are two microswitches which must be closed for the system to think it is ready (one in the X direction and one int the Y direction) There is also a plate detection microswitch. These switches can fail or the small aluminum pads which ress against them can slip out of position. These pads are used to grossly set the home X-Y position. The problem you describe s almost certainly a failure associated with one of these switched or the cabling to them. gary Gary Durack University of Illinois ,
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