Figure 6-21. Drive sprocket and chain, exploded view

f. Remove the truss support assemblies (para 6-39) at

both ends of camera.

g. Remove six screws (10, fig. 6-19) securing limit switch

track (9) to rail (7). Remove 26 screws (8) and washers,

securing camera rail Hi) to tube (12 I. Lift off the rail;

disconnect all accessible wiring .

h. Place handwheel on drive crew (12 and 13, fig. 6-14).

Turn counterclockwise to work out drivescrew unit until it is

dislodged from rear tube flange (14, fig. 6-19). From the

copyboard end of camera, remove the drivescrew from the front

tube flange. Screw off the len-board and copyboard drive

brackets from drivescrew. Remove remaining drivescrew in the

same manner.

i. Remove tapered pin (11, fig. 6-17) of universal joint

(12) to disconnect the lensboard extension shaft (10) from the

back support plate 14-. In similar manner, disconnect universal

joint on other side of camera rail (5 I.

j. Unclamp flexible rubber hose (12, fig. 1-4J from

vacuum back valve housing (1). Then remove eight hex socket

head screws (3, fig. 6-17 (and lockwasher (2) to release back

support plate (4) and camera back from tube Mange.

k. Remove four screws (3, fig. 6-21) to release chain end

cover (1) from camera skid (8). Remove other end of cover at

opposite end of skid in similar manner. Remove 16 screws (3),

securing chain cover i 4) and lift off cover exposing drive chain

(5) and drive sprockets (6 I.

I. Remove setscrew (10, fig. 6-21) from drive sprocket

and tap out tapered pin (I) to release jack screw (2). In (similar

manner, remove jack screw at other end of camera. Remove

drive chain and sprockets from camera skid.

m. Unscrew rear jack screw (13, fig. 6-19) from tube

Range (14) and front jack screw (14, fig. 6-17) from tube flange

(13). Lift off camera tube and disconnect all wiring.

Figure 6-21.

Drive sprocket and chain, exploded

view.

6-19

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