Thermal 1/1.7 Head

Field Change Orders (FCOs)

FCO	Description	Release Date	Priority	Service Actions
D646	Shutter Replacement	August 2000	Next shutter failure	Replace the shutters according to the following procedure:Thermal 1/1.7 Shutter Sensor Replacement Procedure
E445	Improved debris nozzle(50-2117C) is less likely to clog the vacuum sensor port with ablative debris. Click on the photo below for old and new versions of nozzle.	Jan 2002	Next failure	Order kit 05-0246 - includes nozzle,air jet plate, tube and fitting Install procedure
E453	DHU Kit updated: valve added, kit part numbers updated.	22 Oct 2001	Next Failure	Refer to the Dehumidifier Unit (DHU) Installation Procedure. Be sure to order the correct kit. Note that the part numbers have changed:
E246	Replace desiccant box with dehumidifier unit	Aug 2001	Next Failure	Discontinue desiccant systems. Replace with dehumidifier systems that provide clean dry air to slightly pressurize (0.05 tp 0.5" WG) the optical cavity. Refer to the Dehumidifier Unit (DHU) Installation Procedure.

CA13653	Remove the cable connector cover (PN 57-5934A)	Nov 2007	Next Visit	Remove the cable cover from the head. See the procedure in FCO CA13653.
D404	New airjet plate without window	April 2000	Next Visit	Upgrade ALL 1.7X heads on V-machines with new airjet plate (kit PN 30-1163A-C) Air Jet Plate Assembly Installation Procedure

For all obsolete FCOs, see Thermal 1/1.7 FCOs Archive.