If you get your electronics from GetSpares.com, you know the unit will be fully functional.  Why?  Because they test it in the actual tool and run wafers.  Once in a while, a fully functional board can get damaged due to a simple installation mishap.  This post describes this exact situation on KLA / Thermawave Opti-Probe 2600,2690,3260 and 3290 series film measurement tools. Some common revs of this board have part numbers:

14-008473, 14-007009, 14-007003,  14-010064

A 2 minute card swap can turn into a disaster if the P1 power connector is installed 180 degrees rotated.  Careful, this is easy to do because the connector is not keyed!  Take a look at the following picture to see the correct orientation.

P1 Connector. Pin 1 location

Applies to 2600,2680,3260,3290

 What happens if it rotated?  More than we have time to describe!  But basically, when this board fails you may see the following errors:

0x09080008 Can’t complete hardware initialization

0x0608000A Can’t Focus

0x06080011 Failed to close high mag focus loop

0x06080035 High mag focus capture failed: soft limit

0x06080050 Focus pos: 5.466 Limit: 5.465 Corr: 0.000

Don’t forget to visit GetSpares.com for this auto-focus board and many other semiconductor parts.

Hope this helps and Good luck!