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t86 SOUND MOTION PICTURES
with all switches on the sectionalizing panel in "Off" position, listen to the monitor loudspeaker.
2. Throw switch marked "Amp. No. i" and "Amp. No. 2" on the sectionalizing panel to the position marked for the particular amplifier being checked.
3. Throw the switch marked "Cones" to "On" position.
4. Snap switch "LS No. 1" on and listen. If no sound is heard, check the circuit to the loudspeaker fields as explained under "Adjustments — Loudspeakers." Check the loudspeaker cone circuits for short circuits as per "Adjustments — Loudspeakers," page 191.
If rattling noises, distortion, and other objectionable features are present, follow the procedure given under "Adjustments — Loudspeakers" for checking.
5. After the "LS No. 1" group of loudspeakers has been tested, snap switch "LS No. 1" to "Off" position, snap "LS No. 2" switch to "On," and test the second group of loudspeakers in the same manner.
6. Follow this procedure in testing all of the groups of loudspeakers.
7. At the end of this series of individual tests the six groups of loudspeakers should be tested as a unit by snapping all of the "LS" switches to "On" position, running "Gain Control" up to 40, and listening for rattling or other objectionable conditions.
III. ADJUSTMENTS
The following information will assist the projectionist in obtaining proper performance from the reproducer:
A. Projectors Use a standard projector oil on all roller bearings. Keep the gear bases on all projectors using the A. C. motor drive well oiled. Keep all belts free from oil, inspect them periodically, and wipe with a clean cloth. Also, inspect take-up belts for stretch. This is rectified by removing a small section of belt and relocating the hole for the wire clip. If a projector using the D. C. motor drive is slow to