256.
SOUND-ON-FILM TROUBLE CHART
See Section 254 |
| Trouble | Indication | Cause | Remedy |
| No Sound | | "Film-Disc" switch set in "Disc" postion. | Set "Film-Disc" switch to "Film" postion. |
| | Fader in "Off" postion or set for wrong projector. | Set fader to the proper postion. |
| Exciter lamp ammeter reads zero when exciter lam rheaostate is turned on. | Exciter lamp burned out or not properly turned into postion. | Turn another lamp into operating position. |
| Exciter lamp lighted but no light at the photo-cell. | Sound gate aperture completely clogged. | Clean the sound gate aperture. |
| | Defective photo-cell. | Insert new photo-cell. |
| No sound from photo-cell of either projector, sound from pick-ups. | Open photo-cell polarizing battery leads. | Reconnect battery leads. |
| Poor Quality | Fluttering sound from loud speakers. | Poor sound film. | Use good film. |
| Dirty sound gate. | Clean sound gate thoroughly. |
| Dirty constant speed sprocket. | Clean constant speed sprocket. |
| | Dirty or scratched film. | Clean film or use new print. |
| | Defective photo-cell. | Use new photo-cell. |
| | Sound gate open. | Close sound gate. |
| "Wows" | | Dirty sprockets. | Clean sprockets thoroughly. |
| | Worn constant speed sprocket. | Replace worn sprocket. |
| | Viscous damping device out of adjustment. | Check carefully and make whatever adjustment is necessary. See section 92. |
| Unequal Volume from Projectors. | | Weak photo-cell. | Replace photo-cell |
| | Poor exciter lamp. | Turn another exciter lamp into position. |
| | Dirty sound gate aperture. | Clean sound gate aperture. |
| Inequality of volume not very great. | Un-matched photo-cells. | Adjust exciter lamp currents to compensate for inequality of photo-cells. See section 237. |
| Noise or Motor Boating | Noise noticeable on both projectors when operating from sound-on-film but not from disc. | Noisy photo-cell battery -- Battery voltage low. | Replace photo-cell battery. |
| Film weaves noticeably. | Guide rollers out of adjustment. | Readjust guide rollers. See sections 90 and 250. |
| Light ray passes through the sprocket holes or frame lines. | Optical system out of adjustment or film weaves as above. | Adjust guide rollers. If trouble continues, notify RCA service engineer. |
