Owner's manual

Advanced Programming 7-13
7.4.4 Fiducial Options
In Setup Vision on the Configuration menu, there is a Vision Parameter called “Fiducial Options” with
the choices
Pause after search, Skip and Prompt.
Activating Pause after search means that FmXP will pause after every fiducial search and display a
message box indicating the status of the fiducial. This can be helpful during programming sessions, but is
not recommended for production runs since it requires an operator response in order to continue. When
developing a dispensing program, pausing after a fiducial search to verify that the correct fiducial was
found is a good way to determine the best fiducial to use for an application.
Skip and Prompt can be used for production runs. Occasionally chips are placed skewed on a workpiece
or a defect interferes with a fiducial. In this case, if Skip is chosen, the program will automatically skip
the fiducial or part it is searching for and continue with the next step in the program. If Prompt is selected,
the operator is asked to either reteach the unfound location, or skip it and continue the run.
7.4.5 Underfill Patterns
One application that typically uses the multipass feature is underfill. There are several types of line
patterns used for underfill applications. Two common types are L-shaped and U-shaped patterns. See
Figure 7-11. Variations of these types of underfill patterns are used as well. These patterns and processes
are designed to assure complete underfilling without excess and to prevent voids in the underfill.
Item Description
1 Flip Chip
2 First Pass of L-shaped Pattern
3 Second Pass of L-shaped Pattern
4 U-shaped Pattern
5 First Underfill Pass
6 Second Underfill Pass
7 U-shaped Seal Pass
Figure 7-11 Underfill Patterns
2
5
6
4
1
7
3