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136 SOUND MOTION PICTURES
1. If both disk and film equipment are installed switch in whichever is to be tested first by means of the film-disk switching arrangement.
2. Put the pick-up equipment on one machine or turntable in the circuit by setting the fader at point 9 on the side to which this equipment is connected.
3. If you are testing the disk pick-up, rub the needle of the reproducer lightly with the finger. This should be clearly heard in the monitor horn.
4. If you are testing the film pick-up see that the lamp current is at the value previously specified and readjust it if necessary. Take out the light gate by loosening the lever set screw which goes to the photoelectric cell. An oval spot of light will be seen on it. The blurred light should be otherwise clear and uniform. If there seems to be a shadow at one end of spot of light, or at top or bottom, give the lamp further adjustment, sidewise or vertically, as the case may be, until the shadows disappear. Do not change the focus which has already been set. Now move a card up and down across light spot. Every time this is done a click should be heard in the monitor horn. Finally replace the light gate.
5. Move the fader to the other side and test that pick-up equipment in the same way.
6. Bring the fader to "Zero."
5. Shutting down amplifier equipment
With 41-A, 42-A, or 43-A amplifiers, proceed as follows, and always in the order given here:
1. Turn off the horn safety switch.
2. Turn off the starting switches on the 42-A and 43-A amplifiers.
3. Turn off the power safety switch. On D. C. supply, also shut down the motor generator set by turning off the motor switch.
4. Turn off the film pick-up switch on the front wall of