Originally Posted by
oetkbyentc
3 grey chips with gold squares on the face 3/4 of the way down under the white Burndy connector. There is a white IC directly to the right. VLSI layout left to right; axis 1, 2, and spindle. Board may be etched with names or axis number. I believe the 3 square chips stacked vertically to the left are the dacs. Maintenance manual identifies all 3 chips as being the same but a visual check cant hurt. I looked through my archive and haven't located any 3 maintenance drawings.