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(2) Move the winding lever to the right as far as it will go, and hold it against its stop. The indicator gauge should rest at mid-scale. If the indicator is off-center, proceed as below.

(3) Remove intermediate double gear (25), figure 35; loosen retaining nut (29), and disengage intermediate gear (44).

(4) Turn the sprocket wheel one or more teeth, as indicated by the gauge.

NOTE: If the gauge indicator rests at 3, 2 or 1 L , move the sprocket wheel that many teeth to the left. If the indicator rests in the R sector, move the sprocket wheel the indicated number of teeth to the right.

(5) Re-engage intermediate gear (44), and using the gauge, check that the indicator is centered. If it is not, repeat the procedure in (4) above until the gauge indicates the correct positioning of the sprocket wheel.

Figure 4-18. Position of Stop Disc.

(6) Position the stop disc and stop arm as illustrated in figure 4-18, and tighten the retaining nut. Sprocket wheel may have 0.1 to 0.2mm axial play.

(7) Reinstall intermediate double gear (25), fig. 35. Check for correct installation as follows:

(а) Wind the shutter, push the intermediate double gear to the right as far as it will go, and depress the shutter release button. The shutter should operate freely.

(б) Repeat the procedure in (a) above, but push the intermediate double gear to the left as far as it will go.

(8) Recheck the sprocket wheel position as in (1) and (2) above. The indicator should rest at the center of the gauge.

NOTE: When the film transport is properly adjusted, there should be approximately 0.05mm of play between the stop lever and stop disc, as illustrated in figure 4-18.

b. Film Take-Up (Fig. 35). The camera need not be disassembled to adjust the take-up spool compensating friction clutch. It is necessary to remove the top plate if gear (5) requires replacement.

(1) Checking friction of compensating clutch. Place 042.782.001-001-ZlWl adapter on torsion gauge 42-253.01-Z1A59, and insert it in the take-up spool. Rotate the take-up spool by turning the handle of the gauge. The gauge index must position between the tolerance indicators. If it does not, adjust the friction of the compensating clutch as follows:

NOTE: The torque required to overcome friction of the clutch should be between 230 and 270 grams.

(2) Reducing friction. Remove spring (10) and decrease its pressure. Replace the spring and again check friction with the torsion gauge.

(3) Increasing friction. Place one or more additional washers (8) on holding shaft (13). Reassemble the clutch. Check friction with the torsion gauge.

4-11. Delayed Action Clockwork

(Fig. 4-19, 4-20, 28, 29)

a. Cleaning and Lubrication. Completely submerge the delayed action clockwork (10), fig. 28 in benzine and move it rapidly back-and-forth. Remove the clockwork from the bath and use compressed air to dry it. Oil all bearings and again submerge the clockwork in benzine for a brief period. Remove the clockwork from the bath and blow out the benzine, leaving a thin film of oil on the bearings.

b. Replacing Spring (fig. 29). Insert spring (1) in spring carrier (3) and wind it until it fits into the spring housing. Place the free end of the spring on stud (23).

c. Adjusting (fig. 4-19). After the delayed action clockwork has been installed, and the camera inner housing inserted in, and secured to the outer housing, wind the clockwork spring as follows:




Figure 4-19. Delayed Action Lever, Tensioned Position.

(1) Tension the clockwork spring by turning the delayed action lever counterclockwise as far as it will go (fig. 4-19).

(2) Loosen the left-hand-threaded retaining screw with tool 42-253.01-597W2. Lift the lever. rotate it clockwise to the vertical position, and immediately tighten the retaining screw.

(3) Fully tension the clockwork spring by repeating the procedures in (1) and (2) above two or three times.

(4) Set the camera shutter speed dial to B , wind the shutter, and depress the delayed action release button. The delayed action clockwork should not release the shutter. If the clockwork does trip the shutter, increase tension of the clockwork spring as in

(1), (2) and (3) above.

(5) Hold the delayed action lever in its vertical (run-off) position and loosen the retaining screw, permitting the clockwork to operate.

(6) Tighten the retaining screw immediately after the second shutter curtain has been released

Figure 4-20. Delayed Action Lever, Releasing Positions.

d. Checking (fig. 4-20). Set the shutter speed dial to B , wind the shutter, and depress the delayed action release button. The first shutter curtain should release when the delayed action lever is approximately 30° from its vertical position. The second curtain should release when the lever is approximately 5° from the vertical:

4-12. Lens Mounting Flange

(Fig. 4-21)



Figure 4-21. Film Plane Measuring Points.

a. Checking.

(1) Place the camera housing on the gauge block of gauge set 42-253-01-Z1A76 and rest the outer film guides on the mirror surface (fig. 4-21).

(2) Measure the distance from the lens flange to the gauge block with the dial gauge. The gauge indicator should read zero . A tolerance of + 0.005mm or -0.01mm is permissible.

NOTE: When the dial gauge is properly calibrated, a reading of zero is equivalent to 27.95mm.

(3) Place the auto-collimator on the lens flange and check parallity. The reticle reflection should coincide with the collimators reticle. A deviation of one-half the thickness of a reticle line is permissible.

b. Repair.

(1) If the flange-to-gauge block distance is less than 27.94mm, replace the lens mounting flange.