Quarter-Turn Fastener Replacement - Zeiss humphrey HFA II-i series Field Service Manual

Parts Removal/Replacement

3.45 Quarter-Turn Fastener Replacement

The 1/4-turn fastener consists of a 1/4-turn stud and an anchor. The stud is
commonly captured in place by a small plastic washer. The anchor is held in place
by an internal, spring-loaded tab at the upper (outer) end of the anchor.
If it becomes necessary to replace the anchor, proceed as follows.
To remove the anchor:
1) Insert a 1/4"-wide screwdriver blade into the two small slots in the spring-
loaded tab at the upper end of the anchor.
2) Push in on the tab with the screwdriver and turn it 1/8 turn
counterclockwise, to latch the tab in its install/remove position. Remove
the screwdriver and push the anchor out towards the front.
To install the anchor:
3) Make sure that the spring-loaded tab inside the anchor is latched in its
install/remove position (1/8 turn counterclockwise), then insert the anchor
into its hole in the assembly.
4) Insert a 1/4"-wide screwdriver blade into the two small slots in the spring-
loaded tab.
Push in on the tab with the screwdriver and turn it 1/8 turn clockwise to its
5)
anchored position. Remove the screwdriver and check that the anchor is
properly secured in place.
Field Service Guide
Humphrey Field Analyzer II - i
Confidential and Proprietary
3 - 56 52235C1105