Главная страница » Camera repair manual



Figure 4-9. Spring Roller Adjustment.

(5) Adjusting tension of curtain spring rollers (fig. 4-9).

Insert a screwdriver in the tensioning stud slot and push down on the setting ring. Turning the stud counterclockwise increases tension. Turning the stud clockwise decreases tension. Removing the screwdriver re-engages the setting ring.

(6) Follow the procedures in paragraph (4) above, but reset the shutter speed dial to 1/1000-second.

(7) Release the shutter several times and compare the shutter slit width with the 1/1000-second pattern in figure 4-7. If the slit width does not match the pattern, proceed as follows:




Figure 4-10. Speed Setting Cam for 1/1000-second Adjustment.

(a) Entire slit too wide. Bend the speed setting cam (fig. 4-10) so as to widen the slot.

(b) Entire slit too narrow. Bend the speed setting cam so as to make the slot more narrow. NOTE: Adjustments (a) and (6) are seldom required.

b. Slow Shutter Speeds (fig. 4-11, 4-12).

NOTE: The fast shutter speeds must be set correctly before adjusting the slow speeds. The basic adjustment for the slow speed escapement is 1/8-second. This speed must be set precisely.


Figure 4-11. Slow Shutter Speed Adjustments.

(1) Adjusting escapement for 1/8-second (fig. 4-11).

Turn the eccentric setting screw with a screwdriver until the 1/8-second speed is correct, (see par. c below for checking shatter speeds electronically).

(2) Adjusting slow speed setting cam (fig. 4-11).

Shutter speeds from 1-second through 1/30-second, with the exception of 1/8-second, are adjusted by changing the width of the corresponding slot in the slow speed setting cam. Widening the slot decreases the run-off time of the escapement (shortens the exposure), and narrowing the slot increases the exposure time. Check the shutter speed with the electronic shutter tester (par. c below) after each adjustment.

(3) Cleaning and installing slow speed escapement. Dry bearings, or foreign matter in the escapement, will adversely effect the slow speeds. If any components of the escapement are damaged, replace the entire assembly.

(a) Cleaning. Completely submerge the escapement in benzine and move it rapidly back and-forth. Remove the assembly and dry it with compressed air. Oil the bearings. and again place it in benzine for a brief period. Take the escapement from the bath. and lightly blow out the benzine, leaving a thin film of oil on the bearings.


Figure 4-12. Position of Disengaging Lever.

(b) Installing. Install the slow speed escapement on the inner housing as described in paragraph 5-11. Take care that the disengaging lever (fig. 4-12) fits in front of the anchor control lever.

NOTE: The disengaging lever must deactivate the anchor at the 1/15-second setting

c. Checking Shutter Speeds Electronically. Shutter curtain curve patterns are checked on the shutter speed checking drum (par. a above). Shutter speeds are checked on the electronic shutter tester 42-253.01-Z1W111.

(1) Remove the hinged back from the camera, and install hinged back with mirror 42-253.01-Z1W41.

(2) Position the camera housing on the test instrument, fitting the lens mounting flange over the opening. Secure the camera to the instrument with the holding plate.

(3) Wind the camera shutter, set the speed dial to 1-second, depress the 1-second button on the test instrument, and release the shutter. The test instrument meter must register within the 1-second tolerance.

(4) Repeat the operation, as in (3) above, for each of the shutter speeds. The test instrument button, corresponding to the shutter speed being checked, must be depressed. The meter must register within the tolerance for that speed.

NOTE: Permissible shutter speed tolerances:

1/1000 through 1/250-second + or - 20% 1/125-second + or - 10% 1/60-second + 25% - 10% 1/30-second + 20% - 10% 1/15 through 1-second + or - 10%

4-9. Synchronizing Circuits

Before checking or adjusting the synchronizing circuits, shutter speeds should be checked (par. 4-8), and adjusted if necessary.

a. Checking and adjusting Flash Bulb Circuit (fig. 4-13). Set the voltage selector switch of test instrument 42-531-Z1W13 to 500-volts. Connect the camera flash lamp socket to the test instrument with connecting cord 42-253.04.

(1) Checking insulation.

NOTE: The camera shutter should be unwound before connecting to the test instrument.

Set the selector switch to I . Hold the camera shutter release in the depressed position and turn the shutter speed dial through its range from 1/1000-second to B . The meter should not register, and the indicator lamp should not light. If a current leakage is indicated, trace the circuit with test leads 103.25.18 and correct the fault.

(2) Checking conductivity. Set the selector switch to D , wind the camera shutter and set the shutter speed dial to B . Hold the first shutter curtain, depress the shutter release, and allow the curtain to move slowly across the film aperture. After approximately 5-millimeters of travel, the test instrument meter should indicate between 60 and 100.

If it does not, check the circuit for poor connections, dirty contact points, or a defective flash lamp socket. Correct the fault.



Figure 4-13. Flash Bulb Synchronizing Adjustments.