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(3) A receiver may be defective. Test horns one by one, as described in paragraph #3 under previous heading.

(4) Film may be scratched or dirty.

(5) A reproducer may be defective. Test reproducers as described in paragraph #5 under previous heading.

(6) Fader may be defective. Check as described in paragraph #6 under previous heading.

(7) One of amplifier tubes may be defective. Take a new tube and try it in place of each tube in turn until the noisy one is located.

Storage batteries may be dirty on top. See that they are kept clean, as specified under "Running Storage Batteries".

Storage batteries may have been put in use too soon after charging, while still gassing. About half an hour is required for gassing to cease completely.

Storage battery connections may be loose. Keep them tight, as specified under "Running Storage Batteries".

(9) There may be poor ground or loose connection at some point in system. Examine connections and tighten any found loose. If trouble still unsolved, use headset as described under "Troubles-General", and if a defective 43-A amplifier is found, cut it out as described in paragraph #9 under previous heading.

Observer's Equipment Not Functioning

If not loud enough to enable observer and operator to hear each other, or if buzzer is weak or inoperative, make sure that switch on box is pulled out, and that batteries are in good condition. Replace batteries (open battery box by loosening screw in cover). If trouble not here, check line for shorts or opens.

Troubles Occurring During Show

Film Breaks (Film Reproduction)
As synchronism between pictures and sound is inherent in the film, no loss of synchronism is occasioned by a break. Therefore, deal with a broken sound film the same as with an ordinary film in the same circumstances, but in making splice be sure to follow directions given under "Replacements-Splicing Film".

Film Breaks (Disc Reproduction)
Douse light, turn fader to zero, and stop motor. The next step, as specified below, will depend on whether the break is above the intermittent or below it, and whether the sound only consists of a musical accompaniment and incidental effects, or whether there is speech, closeups, etc., which make synchronism very important.

Splice broken films as described under "Replacements-Splicing Film".

Break Below Intermittent - All Cases.

Run down film needed for winding around take-up, by means of handwheel. Do not disturb film at aperture plate, or record and reproducer. Continue run, bringing fader to regular setting as soon as full speed is reached.

Synchronism will usually be maintained under these conditions. However, since audience will lose some of the subject, it is generally better in the case of short subjects not to wait for restarting as just described, but to continue performance immediately by showing next subject, which is set up on other machine. In meantime broken film can be repaired and shown again at conclusion of number which is running on other machine. If break was near end of reel it may not be worth while returning to subject.

Break Above Intermittent - With Speech or Other Sound Accompaniment Where Exact Synchronism is Essential.

In this case it is not possible to continue on broken film without losing synchronism, and there is therefore no option except to continue program with next reel, which is set up on other machine, or else cut out sound for remainder of this reel.