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again wipe dry. (Do not use cotton mechanic's waste for cleaning projectors.)
2. Cleaning Drives and Gears. Attention will now be directed to the drive side of the machine. Remove excess oil from the mechanism and soundhead, using a medicine dropper to drain off oil pools; afterward clean rags. Scrub off accumulations of grime from the gears with a stiffbristled toothbrush dipped in kerosene. Be sure to wipe the kerosene off afterward. Check all machine screws and taper-pins. This is the time to requisition gears and other parts which need to be replaced. Do not oil the projector yet.
3. Checking the Intermittent Test the intermittent sprocket for endplay and backlash when in the locked position. Note the "feel" of the mechanism when the machine is turned by hand. If there are no evidences of binding, the motor may be run for short periods. With the machine running, listen carefully to the intermittent movement with the film gate open. A noisy intermittent unit must be taken out of the head, carefully examined for wear, and adjusted for noiseless, rock-steady operation.
Checking Film Path
4. Check-ing the Film Course. Remove the upper magazine. Clean thoroughly all parts of the film side of the projection and sound heads, using kerosene as a cleaning agent. Carbon tetrachloride may be used to loosen stubborn dirt deposits. A quantity of clean rags, a toothbrush, and copperwire probe are indispensable. The gate door, the aperture plate, and the projection lens should be taken out, and the lens carefully placed in the cabinet for cleaning at a later time.
Check all sprockets for worn or burred teeth. The intermittent and sound sprockets are likely to be the worst, as these are the most difficult to remove. Reverse or, better, replace sprockets having worn teeth.
Examine idlers and pad rollers for wear and adjustment. The lateral and clearance adjustments of pad rollers are sufficiently important to warrant a review of maintenance notes thereon.
Thread a short strip of new film over the sprocket. Open and close the pad roller several times rather sharply. Remove the film strip and examine its edges at the place where
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INTERNATIONAL PROJECTIONIST
APRIL 1954
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