Humphrey Field Analyzer II - i
Adjustment / Calibration
Confidential and Proprietary
52235C1105
4 - 41
Field Service Guide
CRT Yoke
CRT yoke adjustment rotates the display image on the CRT screen.
1)
Slightly loosen the clamp screw that secures the yoke to the neck of the CRT
(Figure 4-14).
2)
Gently rotate the yoke to square the display image within the bezel opening. The
display image should not be rotated more than 1/16". Use the rows and columns
of dots on the touch screen as a reference.
3)
Tighten the clamp screw just enough to keep the yoke from moving (
DON'T
OVER-TIGHTEN
).
CRT Yoke Magnets
NOTE:
Adjustment of the yoke magnets should be avoided if at all possible and should be
attempted only after all other possible remedies have been tried!
Each of these magnets (Figure 4-14) has a subtle effect on size and shape of the display
image. Adjustment of the magnets is a process of trial and error, and becomes a
difficult, time-consuming task. If the display is distorted, consider all other possible
causes before attempting to adjust the yoke magnets.
Caution —
USE CAUTION WHEN HANDLING OR WORKING
AROUND THE CRT YOKE TO AVOID MOVING
ANY OF THE YOKE MAGNETS.
FIGURE 4-14. Z-Axis CRT Yoke Assembly
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