257. FADER CIRCUIT TROUBLE CHART See Section 254 Trouble Indication Cause Remedy No Sound No sound from either the pick-up or the photo-cell of one projector, but sound obtained from the other projector. Defective fader relay or fader potentiometer. Clean contacts of the fader relay or potentiometer. See sections 242 and 243. Defective "Film-Disc" switch. Clean the contacts of the "Film-Disc" switch. No sound from either projector but sound obtained from non-synchronous phonograph. Defective fader relay or fader potentiometer. Clean the contacts of the fader relay or fader potentiometer. Look for broken connections.   Dirty contacts in plugs in input control panel. Clean the contact pins.   Loosely inserted plugs in input control panel. Insert plugs all the way. Noise   Vibration of loosely inserted plugs in input control panel. Insert plugs all the way. Noisy Fading Noise noticed only when opeerating the fader potentiometer. Dirty fader potentiometer contacts. Clean the fader potentiometer contacts. See section 242. Cross-talk on a PG-10 equipment.   Dirty contacts on fader relay. Clean fader relay contacts. See section 243. 15

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