255.
SOUND-ON-DISC TROUBLE CHART
See Section 254 |
| Trouble | Indication | Cause | Remedy |
| No Sound | Motor-boating (frame line) noise only, if exciter lamps are lit | "Film-Disc" switch set in the "FILM" position. | Set "Film-Disc" switch in the "Disc" position. |
| | Fader in the "OFF" postion or set for wrong projector. | Set fader to the proper position. |
| Sound obtained from one projector but not from the other. | Defective pick-up. | Replace pick-up from which no sound is obtained. See section 229. Make sure that the pick-up contacts are clean and tight. |
| | Defective "Film-Disc" switch. | Clean contacts of "Film-Disc" switch. |
| Low Volume | Low volume from one projector only, other O.K. | Pick-up defective. | Clean contacts on pick-ups. Use new pick-up if other projector gives decidedly better results. reset pick-up equalizer. See section 231. |
| Poor Quality | Excessive scratch. | Poor Discs. | Use Good Discs. |
| Dirty Discs. | Use clean discs or clean those in use. |
| Good sound from one projector and not from other. | Defective pick-up on one projector. | Replace defective pick-up. See section 229. |
| Pick-Up Needle Jumps the Groove | | Warped records. | Use good records. |
| Binding noticed upon swinging tone-arm by hand. | Tone-arm binding. | Investigate trouble and correct. |
| | Bottom of the pick-up striking the face of the record. | This trouble will arise only through the use of short needles. Use longer needle or do not insert needle all the way into socket. |
| Pick-up jumps when starting. | Turntable not level. | Level the turntable. |
| "Wows" | "Wows" noticeable only when starting with cold projector. | Grease of viscous damping device cold. Projector mechanism stiff due to cold oil. | Run the projector 15 minutes before the show. |
| "Wows" continue after projector has warmed. | Viscous damping device out of adjustment. | Adjust viscous damping device. See section 71. |
| Turntable coupling out of line. | Line up turntable. |
