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4-6. Driveshaft Assembly

(Fig. 4-4. 4-5. 4-6. 1-10, 35)

CAUTION: The camera shutter must be wound before installing the driveshaft assembly.


SECTION or DRIVE SHAFT

BEARING PLATE

DOUBLESTOPLEVER

SECTION OF GEAR

DOUBLE STOP LEVER

DRIVE SHAFT GEAR


Figure 4-4A. Drive Shaft Assembly.

Figure 4-4B. Drive Shaft Gear.

a. Position the driveshaft gear to align one of its cut-out sections with the cut-out in the drive-shaft bearing plate (fig. 4-4 A ).

b. Position the driveshaft assembly over its mounting holes on the inner housing, while pushing back slightly on the upper end of the double stop lever (fig. 4-5).

c. Align release disc (14), fig. 35 with tool 42-782.001-161WNY, and simultaneously engage the eccentric pin with the counting pawl (fig. 1-10).

d. Hold the driveshaft gear assembly to the inner housing by installing one screw, and tightening; it slightly.

PIN OF SECOND CURTAIN ROLLER

DOUBLE STOP LEVER


Figure 4-5. Double Stop Lever, Released Position (Top rear view).

DOUBLE STOP LEVER


DRIVE SHAFT GEAR

Figure 4-6. Double Stop Lever, Wound Position (Top rear view).



c. Wind and release the shutter. Observe that the lower portion of the double stop lever engages the drive shaft gear, as illustrated in figure 4-4 B ; and that the upper portion rests against the stop disc, as illustrated in figure 4-6. The pawl (fig. 1-10) must engage the teeth of the ratchet gear when the shutter is fully wound or released.

f. Secure the driveshaft gear assembly by installing the remaining two screws. Tighten all three screws.

g. Replace the driveshaft gear if it is damaged. 4-7. Adjusting Release Mechanism

(fig. 21,35)

a. Install release sleeve (32). fig. 21, with release knob (31). winding lever (8). saddle spring (7). and screw ring (6).

b. Wind the camera shutter, rest gauge 42-253.01-Z1L74 on the screw ring, and depress the center shaft of the gauge. The shutter must release.

c. If the shutter does not release, adjust flat spring (20). figure 35 as follows:

(1) Loosen screw (19) and shift the position of the flat spring until the shutter releases when depressing the center shaft of the gauge.

(2) Retighten screw (19).

d. Wind the shutter and set the shutter speed dial to B . Depress the shutter release knob approximately 1.5mm. The first shutter curtain should release.

e. Fully depress the shutter release knob, and slowly let it return to its up position. The flat spring should push the release knob, and arresting lever B , upward and release the second shutter curtain. After release of the second curtain, the release knob and arresting lever B . should have an additional upward travel of approximately 0.2mm.

f. If the requirements in e above are not satisfied, loosen nut (21), fig. 35 and position adjusting screw (22). Retighten the screw.

g. Check the tension of the flat spring with gauge 42-253.01-Z1A22, and adjust by bending the

spring.

h. The release mechanism should operate smoothly. Replace the release knob (31), fig. 21. or the release sleeve (32) if they are damaged.

4-8. Adjusting Shutter Speeds

Wind the camera shutter and tension the spring rollers as described in paragraph a (5) below. Check the spring tensions with gauge 42-216-Z1W42. The first curtain should be tensioned to read 17 to 18 on the gauge, and the second curtain should be tensioned between 17 and 21.

a. Fast Shutter Speeds (fig. 4-7 through 4-10).

(1) Wind the camera shutter, and set the shutter speed dial to 1/500-second.



(2) Position the speed pattern checking plate 42-258.01-Z1A95 in the film aperture, and place the front of the camera over the opening of the shutter speed checking drum 42-258.01 -Z1W100.

(3) Release the shutter, and check the curved pattern of the second shutter curtain against the pattern plate. If the gradient of the curtain curve does not match the pattern on the plate, proceed as follows:

(a) Curtain curve steeper than pattern. Increase tension of the second curtain spring roller. (See paragraph (5) below).

(b) Curtain curve flatter than pattern. Decrease tension of the second curtain spring roller. (See paragraph (5) below).


500 1000

Figure 4-7. High Shutter Speed Patterns.


(4) Remove the pattern checking plate from the camera. Wind and release the shutter (still set for 1/500-second) several times. Compare the shutter slit width with the 1/500-second pattern in figure 4-7. The lower part of the slit should be wider than its top. If the slit width does not match the pattern proceed as follows:

(a) Lower part of slit too narrow. Increase tension of the first curtain spring roller. (See paragraph (5) below).

(b) Lower part of slit too wide. Decrease tension of the first curtain spring roller. (See paragraph (5) below).


Figure 4-8. High Shutter Speed Adjustment.

(c) Entire slit too wide or narrow. Turn the eccentric shaft of arresting lever B

(fig. 4-8) to the right or left with tool 42-253.01-U281W3. Reset shutter to 1/250 and 1/1000. Compare slit width with patterns in fig. 4-7.

NOTE: The spring should press against the eccentric shaft with a lateral force of 110 grams + 20 grams, - 0 grams. The downward pressure of the spring against arresting lever D should be 130 grams + or - 10 grams.




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