ABB IRB 760 Series Product Manual page 354

5 Calibration
5.2.1 Synchronization marks and synchronization position for axes
Continued
Synchronization marks at axes 2, 3 and 6
The synchronization marks at axes 2, 3 and 6, shown in the figure above, consist
of two single marks that should be positioned opposite to one another when the
robot is standing in its synchronization position. One of the marks is more narrow
than the other and should be positioned within the limits of the wider mark.
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Product manual - IRB 760
3HAC039838-001 Revision: M