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k. Removal and Partial Disassembly of Sprocket Wheel Assembly (fig. 85).

(1) CAUTION: Stop disc retaining nut and sprocket wheel shaft have left hand threads.

Remove stop disc retaining nut (29) with tool 42-25S.01-31W3 and lift off stop arm (30) and stop disc (31).

(2) Remove screw (32) and lift off gear (33) and washer (36).

(3) Remove screw (34), pull out shaft (35) and remove washer (48).

(4) Remove 2 screws (37), lift off curved bracket plate (38) and sprocket wheel (39). l. Removal and Disassembly of Brake Assembly (fig. 36, 37).

(1) Remove screws (1), fig. 36, and (2) and lift out brake assembly (3).

(2) Remove C clip (1), fig. 37, from shaft B , lift off spring (2) and brake shoe (3).

(3) Remove eccentric nut (4) with tool 42-582.01-273W3 and pull out shaft (5) with spring washer (6) and washer (7).

(4) Remove bushing (8) with tool 42-253.01 -320W2 and spacer (9).

(5) Remove screw (10) from shaft A and lift off spring washer (11), upper actuating plate (12), friction washers (13) and (14), brake disc (15), lower actuating plate (16), and friction washer (17).

m. Removal of Shutter Curtain Assembly (fig. 36).

(1) Remove 2 shutter tension adjusting bearings (4) with tool 42-253.01-U257W3.

(2) Lift out shutter curtain assembly (9). n. Disassembly of Shutter Curtain Assembly (fig. 38).

(1) Remove 2 screws (1) and curtain holding bar (2).

(2) Remove second shutter curtain (18) from main roller (5), and second shutter curtain ribbons from ribbon spring roller (17).

(3) Remove first shutter curtain (19) from first curtain spring roller (11).

(4) Remove first shutter curtain ribbons from main ribbon rollers.

(5) CAUTION: Tensioning studs (6) and (12) have left hand thread. Remove tensioning stud (6) from spring roller assembly shaft (10).

(6) Remove 2 C clips (7), 2 washers (8) and 2 ribbon guide rollers (9).



(7) Remove spring roller shaft assembly (10) with tool 42-253.01-246NY.

(8) Remove tensioning stud (12) and washer (13) from spring roller assembly shaft (16).

(9) Remove 2 C clips (14) and washer (15).

(10) Remove spring roller shaft assembly (16) with tool 42-253.01-246NY.

Section II. EXPOSURE METER

3-9. General

Do not disassemble the exposure meter beyond that necessary to make the repair. Disassembly of the meter movement, or printed circuit assembly, is not authorized. If these components are damaged, replace the entire meter circuit insert.

3-10. Disassembly of Housing

(Fig. 40)

a. Remove retaining screw (1) from exposure meter assembly (2) with tool 3.719.004.01/5W1NY.

b. Remove aperture dial (3) with spacer washers (4) and (5).

c. Remove speed dial (6).

d. Remove plastic washer (7) from housing (10). NOTE: Remove plastic washer (7) only if damaged.

e. Remove 2 screws (8) and 2 screws (9).

f. Push battery test switch in the direction of its arrow, and remove housing (10) from insert (13).

g. Remove washer (11).

h. Unhook spring (12).

3-11. Disassembly of Switches and Gear System .

(Fig. 41)

a. Set coupling knob (21) to B position.

b. Slide out battery test switch (1) through its slot in insert (2).



c. Remove screw (3), washer (4) and spacer (5).

d. Remove switch arm (6). spacer washer (7) and insulating washer (8).

e. Remove screw (9). washer (10) and gear (11).

f. Remove washer (12) and nose washer (13).

g. Remove 2 screws (14).

h. Lift off sector-gear assembly (15).

i. Remove C clip (16) and washer (17). j. Lift off gear (18) from mounting plate (19). k. Remove spring (20). l. Remove coupling knob (21).

NOTE: To remove coupling knob (21). remove mounting foot and battery cover (see (see TM 11-6720-244-12, fig. 5-2).

Section III. LENSES

3-12. General

Do not disassemble a lens beyond the point necessary to make the repair. Scribe mating parts (except optical components) to assure proper positioning when reassembling.

3-13. Disassembly of 35rrrn Lens

(Fig. 42)

a. Remove fluted tube (3) and serial number ring (4).

b. Remove retaining ring (5).

c. Remove 3 screws (6), front ring (7). and adjustment ring (8).

d. Remove set screw (9). retaining ring (10), anddiaphragmadjusting ring (11). NOTE: Hold spring (14) with finger to avoid loss of spring and ball (15).




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