•Remove the magazine throat assembly 
. The gear drum and film channel will become visible.
•Possibly emulsion or film scraps are in the interior. Clean carefully.
Under no circumstances blow substances away!
Remove deposits from the film with The ARRI plastic film track cleaning rod or with a paper towel and some spirits.
Under no circumstances remove deposit from the film with metal tools!
Mounting
•Replace the magazine throat assembly. Only one mounting orientation is possible: pay attention to the form. Push the assembly to lock in.
•Replace the screws. Tighten the first screw completely before screwing in the second screw.
The torque of the screws has no influence on the image sharpness or adjustment of the film channel.
Replacing the Lens in the 
Strong scratches on the lens of the recording unit cause the light to scatter. The lens on the recording unit should be replaced by the ARRI Camera Service department.
Replacing the Glass Window 
Large scratches on the gate for the film end sensor on 16SR 3 magazines could prevent the film end sensor from functioning. The glass window should be replaced.
•Replace the frame with the glass window.
•Check function.
Flange Focal Distance
The flange focal distance should be checked after every change from Normal 16 to Super 16, or when optimal sharpness could not be attained during the sharpness test. When using the compensation adapter for the 41
mmbayonet, the depth gauge A 16
Maintenance
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