The electronic circuit board 277266 Timing Generator goes into KLA-Tencor Surfscan systems S6100, S6120, S6220, and S6420. The board is integral to the tool, which provides high precision defect inspection for silicon wafers. GetSpares.com maintains fully functional Surfscan systems on their warehouse floor – that means good parts for sale, or good test environments for repaired parts. If your tool is down, contact GetSpares.com today for replacement/repair solutions.