We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
screws you can find. There may be dozens of them, of course, but you are sure to find at least one which has worked loose. Screws must all be tight, but at the same time they must not be forced. In particular, do not force any screws in the lens mount or exciter base, nor any you find in the valve bases. Screws which hold the exciter base in position will flatten the exciterbase or cap if forced in too far.
Whilst you are attending to the screws, examine all parts for damage and signs of wear. And ensure that all moveable parts have no excess or restricted movement.
6. Clean all external wire belts and replace those which are kinked or stretched. Remove all grease from the inside rims of the pulleys to prevent the belts subsequently slipping during projection. If the take-up head is efficient, leave it alone. Before replacing the belts, attend to any oiling-points in the pulleys and take-up ; the grease-point in the pulley attached to the motor is usually the one most neglected.
7. The amplifier should now be freed from dust, preferably with the aid of a vacuum cleaner. See that all valves are properly seated, and clean the photo-electric cell. When replacing the amplifier, do not omit any rubber rings which go with the screws. The rings, or cushions, are intended to absorb vibration which may be transmitted to the amplifier from the mechanism and for this reason the screws must not be forced in too far so that the rings are entirely flattened.
8. Clean and tighten all electrical connections, including those on the mains and speaker cables, plus those on (or used for) the transformer and /or resistance units. Make new connections where you find the wire frayed or partially broken.
9. Now attend to the projector stand. Oil the hinges if required and repair any faults you find.
10. Clean the loudspeaker, but only if necessary, but do not interfere in any way with those parts which are normally kept covered. Examine the wiring of the mains input which you can see in the back of the speaker and look for poor contacts, etc. And, of course, tighten up any screws you may find, especially those which hold down the carrying handle.
11. When you have finished servicing the equipment, connect the mains and switch on and let the projector run for a few minutes. You can then see what damage you have caused.
122