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Linen or chamois-leather used for cleaning the lens should be very soft, and the latter not of the kind which has been treated by any oil or tanning process. Special cleaning outfits and special lens cleaning-fluid may be purchased at most cine dealers, and if you value your projector it is well worth going to the expense of getting the right equipment for servicing it.
When cleaning the lens first remove the dust, either by blowing or by using a soft camel-hair brush, then use the cleaning fluid by gently wiping, and lastly polish with a clean piece of cloth or soft tissue paper. A special type of lens cleaning-tissue may also be purchased. The cloth, preferably linen, should not be of the type likely to leave minute hairs sticking to the glass, and it must be quite clean and dry before it is used. The cleaning fluid should not be poured onto the lens, a moistened cloth being quite sufficient.
After you have finished cleaning the lens replace it and switch on the projector lamp — you will then be able to see if it is properly cleaned or not. If the lens show a fine bluish film which can be removed by your fingers but not with the cloth then the cleaning-fluid or the cloth is no good, and you had better try another kind. But remember that lens "blooming" or "coating" also produces a fine bluish film such as that mentioned above. Make sure, therefore, when cleaning the lens that you do not cause unnecessary damage.
Spare lenses are best kept in tissue paper or cotton wool, and packed away so that they cannot move or get damaged.
Motor Care
The electric motor does not usually require any lubrication, but this does not apply to adjoining bearings, and depends, of course, on the type of machine. Operators should watch the motor for excessive sparking, and ensure that the carbon brushes are not in need of replacements. The commutator segments must also be kept clean by means of a piece of cloth on the end of a match-stick, but not, of course, with the motor running nor even with the mains connected.
The bearings of a motor are usually packed with grease, and as a rule these should be examined after every hundred showinghours. Where the grease is packed within a screw-top filler the screw should be given one complete turn at the same period.
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