Zeiss humphrey HFA II-i series, Field Service Manual

Page: 145 / 521

Humphrey Field Analyzer II - i Adjustment / Calibration
Confidential and Proprietary
52235C1105 4 - 43
Field Service Guide
FIGURE 4-15. Chinrest Centered Relative to Front Cover
7) If the alignment is not correct, adjust the trial lens holder as follows:
a) Check that the trial lens holder shaft rotates properly in the pivot block at the
base of the shaft. If the stop screw at the base of the shaft (Figure 4-17) is
screwed in too far, it will contact the top surface of the pivot block and impede
rotation of the shaft.
b) Loosen the two screws on the bottom of the shaft (Figure 4-17). This will allow
up/down and left/right movement as necessary to obtain proper adjustment.
c) With the trial lens holder positioned around the adaptor, retighten the screws.
The trial lens holder should not put pressure against the alignment adaptor
(Figure 4-16).
8) Check that the arm of the trial lens holder moves up and down smoothly in the slot of
the trial lens trap. If necessary, the trial lens trap can be repositioned slightly by
loosening the screw at each end of the trap.