A component placement error occurs at only part of a board.
1, Data entry error of X- and Y- coordinates on the "placement" data screen.
   - set the correct coordinates on the "placement" data screen( by checking the CAD coordinates or performing a teaching operation again)
2, If you use CAD data, coordinates of a component placement position of CAD data or those of a BOC mark are incorrect. If coordinates of one BOC mark are shifted, coordinates of components that are placed             around the BOC mark are shifted greatly.
   -  Check the CAD data. If it is incorrect, reset the coordinates of components placement positions or reset those of the BOC mark.
3, A BOC mark is stained.
  - Clean the BOC mark. Maintain BOC marks so that they cannot be stained.
4, Data entry error in the " PWB thickness" field on the "PWB" data screen. in this case, a board is loosened in the up and down directions, and a component placement error may occur in the certain area of a board.
   Normally, the amount by which the placement position of a component is shifted from the regulated position varies depending on a board.
   - Check and/ or modify the valuesin the " PWB height" and/ or " PWB thickness" field(s) of the "PWB" data screen.
5, The backup pin is not installed properly. For a thin board or large board, a component placement error may occur more frequently.
   - Install the backup pin especially under a component that causes a component placement error.
6, Since the support table moves down quickly, a component that has been placed on a board is moved when the machine releases the clamped board.
   - Set the " Down Acceleration" to " middle" or " low" o the " PWB conveyor" menu invoked from the " setting Group" menu of the " machine setuo" screen.
7, The flatness of the board top side is not enough.
   - Decide whether the board is used or not. If the backup pin position is adjusted, the flatness may be improved.