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(2) If the replaced lens flange, when secured to the housing, measures more than 27.955mm from the flange to gauge block, it must be turned down to the required thickness. Use lathe jig assembly 42-253.01-535W15.

(3) If the inner or outer camera housing, or lens mounting flange is bent, replace the damaged item.

4-13. Range-Viewfinder

(Fig. 27. 4-22 through 4-28)

a. Bright-line Frame Assembly. Replace if damaged

b. Range-viewfinder Assembly. Replace entire assembly if components, other than the bright-line frame assembly, are damaged.

c. Cleaning Bright-line Frame Glass Plate (fig. 27).

CAUTION: Do not remove glass plate (6) from glass plate mount (4).

Moisten a Q-tip with lens cleaner U and carefully wipe exposed surfaces on both sides of the glass plate. Use a clean dry Q-tip and remove the lens cleaner.

NOTE: Lens cleaner should not be allowed to dry on the surface and should be removed while still damp. If this procedure is not followed, dust particles will remain and be magnified in the viewfinder.

d. Adjusting Rangefinder.

NOTE: The lens mounting flange must be correctly adjusted (par. 4-12) before attempting to adjust the rangefinder.

ADJUSTMENT FOR 90mm


ECCENTRIC (SLOTTED)

Figure 4-22. Range-Viewfinder Adjusting Points.



R.V.F. CALIBRATION STAND


Figure 4-23. Range-Viewfinder Calibrating Stand.

(1) Mount the eyepiece lens 42-582.03-Z1W1 on the rangefinder (fig. 4-22) and secure the distance setting gauge 42-582.01-Z1A10 in the lens mounting flange. Place the camera in the holder of the calibrating stand (fig. 4-23) and adjust the focusing telescope to view the 10-meter graticule (fig. 4-24). Set the index of the distance setting gauge to infinity and view the graticule through the telescope.


Figure 4-24. Rangefinder Image at Infinity.

(2) Turn the eccentric shaft (fig. 4-27) with tool 42-253.01-703W2 until the rangefinder

image coincides laterally with the graticule (fig. 4-24). Adjust vertical image coincidence by turning the eccentric screw (fig. 4-22) with tool 42-582.03-Z1W6.




Figure 4-25. Rangefinder Image at 10-meters.

(3) Place the index of the distance setting gauge opposite the 10-meter mark and view the 10-meter graticule through the telescope. The rangefinder image should coincide with the graticule as illustrated in figure 4-25.


BEARING SURFACES

Figure 4-26. Distance Setting Bearing Surfaces.

(4) Rotate the distance setting gauge alternately clockwise and counterclockwise, from the 10-meter mark, to positions indicated by click stops. The rangefinder image should remain stationary, in relation to the graticule, during the back-and-forth rotation. If the rangefinder image moves, straighten the roller arm as in (5) below.

NOTE: The distance setting gauge has an upper and lower bearing surface, which

rides on the rangefinder roller arm, between the limits of the 10-meter click stops (fig. 4-26). The off-set bearings permit checking the perpendicular alignment of the roller arm.

STOP ARM ECCENTRIC CAM B


ROLLER

HOLE FOR BENDING TOOL

Figure 4-27. Range-Viewfinder Roller Arm.




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