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11
Problem Cause Remedy
Scratches on the emulsion side of the negative
In the image area, Dirty or damaged cross bars Clean or, if defective, replace the lm gate
over several frames on the lm gate
In the image area, Upper or lower lm loop too long, Check the loop length of the magazine
short and periodically recurring lm touches inside of magazine throat
(above and below)
Outside the image area Dirty or damaged longitudinal bars Carefully clean lm gate and magazine throat
on the lm gate or,
or lm running surfaces in the magazine throat if defective, replace
Scratches on the glossy side of the negative
In the image area Dirty or damaged lm track Clean lm track and pressure plate
or pressure plate or, if defective, replace
Outside the image area Dirty or damaged longitudinal bars Carefully clean longitudinal bars and magazine throat
on the lm track or,
or lm running surfaces in the magazine throat if defective, replace
Scratching in general Strong tendency of raw lm stock to build up Notify the manufacturer of the lm stock,
emulsion, dust on raw stock from perforation use different lm stock
process, extreme temperatures,
scratched raw stock
Appendix