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Loss of Top Loop
This is nearly always caused by leaving open the feed-sprocket guard, though it might also be caused by two or more torn perforations. Make a habit of checking the lacing of the film before switching on.
Projector Lamp Fails
Premature failure of the lamp is usually caused by excess voltage and a new lamp should not be used in its place before the voltage has been carefully checked. Check both the mains supply and the output from your transformer or resistance unit, and make sure that the lamp is of the correct rating for the current in use.
Should a second lamp fail as soon as it is switched on, the most probable cause will be a short circuit somewhere between the transformer /resistance and the lamp. A break in the mainstransformer cable, for instance, might isolate that unit from the remainder of the lamp circuit, which would allow the full mains voltage to reach the lamp. When a new lamp is given too high a voltage, it usually gives one glorious burst of light before setting you back five shillings. When that happens, do not risk another lamp until you have found and corrected the fault.
No Picture, But Voltage Supply Correct
This may be caused by any of the following: — Dowser switch forward. Lamp burnt out. Lamp switch not on. Lamp not correctly seated or not making proper contact. Faulty switch or switch wiring.
Poorly Lit Picture
Low voltage; blackened lamp; room not sufficiently blackedout; dirty optical system; the film itself is dark.
Picture Lacks Definition
Lens not properly focussed; Projection lens dirty; gate not properly closed; the film itself is faulty — <x poor print.
jumpy Picture
Gate not clean; gate not closed properly; incorrect tensioning of pressure (side) rails, runners or shoes. See if a light finger
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