Zeiss humphrey HFA II-i series, Руководство по обслуживанию на месте

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Adjustment / Calibration Humphrey Field Analyzer II - i
Confidential and Proprietary
Field Service Guide
4 - 14 52235C1105
5) Verify that the printer is on-line, then print the CAL values. Verify that the shutter
value is between 120 and 220.
If the stored shutter value is out of range, loosen the shutter setscrew and reposition the
shutter on the motor shaft as follows: (Removal of the film ND wedge may be required.
If removed, make certain the setscrews are retightened when reinstalled.)
a) If the Cal value is greater than 220, mount the shutter slightly higher (further
clockwise) than previously positioned. Retighten the setscrew.
b) If the Cal value is less than 120, mount the shutter slightly lower (further counter-
clockwise) than previously positioned. Retighten the setscrew.
c) Repeat steps 3, 4 and 5a or 5b, until the shutter value is within the specified
range.
6)
Verification:
Proceed to the Motor Exerciser menu and exercise the film ND wedge for
100 iterations. Then exercise the shutter (with the lamp OFF) for 100 iterations. The
shutter should operate silently.
4.8.2.3 Aperture
Purpose
This procedure is designed to ensure that all five holes in the aperture wheel are properly
centered relative to the light path.
Special Tools/Equipment Required
P
Pencil
P
Small Piece of Self-Stick Note Paper
Procedure
1) Dim the room lighting to enable a better view of the stimulus.
2) From the Mechanical Calibration menu, select APERTURE and then LENS BASED .
NOTE: Currently, the GRID BASED selection is used only in manufacturing and requires a
special tool.
3) On the patient side of the aperture wheel (Figure 4-5), locate the reflected image of the
III stimulus.
4) Using the STEP icons, rotate the aperture wheel until the reflected image and the III
hole match (the light passes directly through the size three hole), then select
STORE
.