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(5) Insert bending tool 42-253.01-700W2 in the hole of the roller arm (fig. 4-27) and bend the roller arm until the images remain stationary. Follow the checking procedure in (4) above.

(6) Swing the viewing telescope away from the rangefinder eyepiece and adjust the camera holder of the calibrating stand to view the 1-meter cross-lines (fig. 4-23).

(7) Set the index of the distance setting gauge to 1-meter and view the cross-lines through the rangefinder eyepiece. The rangefinder image must coincide with the cross-lines. If the images do not coincide, proceed as in (8) below.

(8) Loosen the screw, holding eccentric cam A (fig. 4-27) with tool 42-253.01 -630W6. and turn the cam until the images coincide. Tighten the screw.

(9) Alternately check and adjust, between the 10-meter and 1-meter targets until the range-finder image coincides with the target at each of the distances. -

(10) Set the index of the distance setting gauge at 0.7-meters and check image coincidence on the 0.7-meter target. If the images do not coincide, alternately check, and adjust, at all distances as described in paragraphs (2) and (8) above. (Seldom is an adjustment necessary at 0.7-meters when adjustment is correct at other distances).

(11) After adjusting image coincidence (both laterally and vertically) at infinity, 10-meters. 1-meter and 0.7 meters, proceed as follows:

(a) Remove the distance setting gauge from the camera, and push the rangefinder roller arm to the rear. Adjust eccentric cam B so it stops the roller arm after a slight over-ride of the infinity setting. Secure the eccentric cam with a small quantity of cement N .

(b) Bend the stop arm (fig. 4-27) to stop the roller arm in its forward movement after a slight over-ride of the 0.7-meter setting.

c. Checking and Adjusting Viewfinder Parallax (fig. 4-22, 4-28).

(1) Lock the distance setting gauge 42-582.01-Z1A10 in the lens mounting flange, and place the camera in the camera holder of the calibrating stand (fig. 4-23). Lock shutter release with tool 42-253.01-Z1W84. Position the groundglass screen behind the film aperture, and set the distance gauge for 1-meter. Adjust the camera holder to align the edges of the film aperture with the solid frame lines of the 1-meter graticule.

(2) View the 1-meter target through the camera viewfinder and 90mm bright-line frame which has been positioned by the setting gauge. The bright-line frame must coincide with the solid frame lines. If it does not, proceed as follows:

(a) Turn the slotted eccentric (fig. 4-22) until the viewfinders bright-line frame is parallel with the solid frame lines of the graticule.

(b) Turn the guide rivet (fig. 4-22) with tool 42-582.03-62W2 until the bright-line frame coincides with the solid frame lines of the graticule.

(c) Set the distance setting gauge index to the infinity mark. The 90mm bright-line frame should move diagonally and coincide with the broken frame line (fig. 4-23) of the graticule. (Slight deviations in coincidence are permitted at the infinity setting).

4-21



(d) If the lines do not reasonably coincide at infinity, loosen the two screws (fig. 4-22) and shift the entire bright-line frame assembly. Recheck alternately between 1-meter and infinity. Readjust as necessary, with the guide rivet and by moving the mask assembly, until coincidence is obtained at both settings. Coincidence at 1-meter should be precise.

(c) Turn the distance setting gauge back-and-forth. between the 0.7-meter setting and infinity, while observing the bright-line frame through the viewfinder. Diagonal movement of the frame should be smooth and positive.

f. Checking and Adjusting Bright-Line Frame Masks.

PRESS BUTTON


SETTING LEVER

FRAME SETTING GAUGE

Figure 4--28. Frame Setting Gauge.

(1) Lock the frame setting gauge 42-253.01-Z1A107 (fig. 4-28) in the lens mounting flange, and place the setting lever of the gauge at mid-point to position the 50mm bright-line frame.

(2) Observe the 50mm bright-line frame in the viewfinder and rotate the large knurled portion of the frame setting gauge back-and-forth within its limits. Alternately depress and release the press button, while rotating the gauge. (Pushing the press button in positions the bright-line frame for infinity, and releasing it simulates the frame position at a distance of 1-meter). The 50mm bright-line frame should be fully visible without the 90mm or 35mm frames appearing in the field. If this condition is not met, proceed as follows:

(a) Turn the 50mm adjusting shaft (fig. 4-22) until only the 50mm bright-line frame is seen in its entirety.

(b) Repeat the checking procedures in (2) above.

(3) Release the setting lever and rotate the front portion of the frame setting gauge to position the 90mm bright-line frame.

(4) Observe the 90mm frame in the viewfinder and follow the procedures in (2) above. The 90mm bright-line frame should be fully visible without the 35mm or 50mm frame appearing in the field. If this condition is not met, proceed as follows:

(a) Turn the 90mm adjusting shaft (fig. 4-22), until only the 90mm bright-line frame is seen in its entirety.

(b) Repeat the checking procedures, but for the 90mm frame, as in (2) above.



(5) Rotate the front portion of the frame setting gauge to position the 35mm bright-line frame.

(6) Observe the 35mm frame in the viewfinder and follow the procedures in (2) above. The 35mm bright-line frame should be fully visible without the 50mm or 90mm frame appearing in the field. If this condition is not met, proceed as follows:

(a) Turn the 35mm multi-slotted adjusting nut (fig. 4-22) until only the 35mm bright-line frame is seen in its entirety.

(b) Repeat the checking procedures, but for the 35mm frame, as in (2) above.

(g) Final Range-Viewfinder Check. After installing the camera top plate, recheck, and if necessary adjust, the rangefinder as in paragraph d above. Recheck the viewfinder parallax and bright-line frames as in paragraphs e and f above.

NOTE: Eyepiece lens 42-582.03-Z1W1 must be removed from the rangefinder before installing the top plate.

4-14. Top Plate Assembly

(Fig. 21, 24)

Eyelens. Replace if damaged.

Range-Viewfinder Windows. Replace if damaged.

Illuminating Window. Replace if damaged.

NOTE: When installing the illuminating window, face the prismatic surface outward. To

remove the holding bracket, open the metal clip slightly and slide the bracket down. When replacing, insert the bracket in the metal clip, slide it up, and close the clip.

Top Plate. If the top plate is badly dented, or otherwise damaged, replace it.

4-15. Hinged back

(Fig. 4-29))



z У. > ш& B

Figure 4-29. Pressure Plate Removal.




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