Viewfinder Display Adjustment; Focusing Screen Replacement - Canon A-1 Repair Manual

accuracy must have been previously confirmed,
as well as the accuracy of the EV tester.
1. Set the camera in the AV mode.
2. Set the A/T dial to f/2, f/5.6 and fill and release
the shutter and read the scale on the AE Evaluation
Standard lens. (Disregard this step when using the
alternate method.)
3. Check the exposure value at f/2, f/5.6 and f i ll.
(Read the exposure value as closely as possible.
This test involves adjusts in 1/8EV increments.)
4. If the EV tester indicates slight over exposure,
correction can be made by opening the pattern at
pOint l( and point 2 if necessary) in figure 2-12 .
(Opening one point on the pattern causes a shift
of 1/8 EV under. No over adjustment is provided.)
Note: This adjustment is necessary if electrical
components are changed.
Poor operation of Mg . l may cause large
variations in this test .
Viewfinder Indications should be disregarded.
2.24 Viewfinder Display Adjustment
Adjustment of individual digits within the display is
not possible. Limited adjustment of the display unit
is possible to correct positioning or tilt within the
mask. Adjustment is made by loosening the two Screws
(X16-l70l-880) holding the DO Flex Unit. The display
is an intergal part of the flex unit.
2.25 Focusing Screen Replacement
1. The focusing screen is replaceable simply by remov-
ing one screw. Remove the lens and Screw (X18-
1702-280) from the focusing screen Holder (CFl-0280-
000). When the holder is removed the Focusing
Screen Holder (CFl-0257-000), which is hinged at the
rear, will drop down from the front and the focusing
screen can be removed.
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