RCA-21-S-348-Sams-24.. - Early Television Foundation

TROUBLE SHOOTING AIDS (cont)POWERDEAD SETIf filaments fail to light, check AC interlock assembly, switch on volumecontrol and Tl. If filaments light, substitute V20 and V21. Check B+ filter anddecoupling network components.SMALL AND/OR DIM PICTURECheck by substitution V20 and V21. Check B+ filter and decoupling networkcomponents.HIGHVOLTAGELOSS OF HIGH VOLTAGECheck by substitution V16, VI7, VI8 and V19. Check waveform W16.If SatisfactoryCheck T2, T4A, C122, R121, andother associated circuit components.If UnsatisfactoryCheck C115, R116 and other associatedcomponents.INSUFFICIENT HIGH VOLATGECheck by substitution V16, V17, V18, V19, V20 and V21. Check picturetube. Proceed as outlined under "Loss of High Voltage".Check by substitution V16, V17, V18, V19, V20 and V21. Check T2, T4A, C122,R121, R119, C116, picture tube and other associated circuit components.GENERALRASTER SOUND NO PICTUREFollow procedure outlined under "Loss of Video".RASTER PICTURE NO SOUNDFollow procedure outlined under "Weak or No Sound".RASTER NO SOUND NO PICTURECheck by substitution VI, V2, V3, V4, V5 and V6. Check associated circuitcomponents.NO RASTER NO SOUNDFollow procedure outlined under "Dead Set".KEYSTONE EFFECTCheck T4, C123, R122, H123 and R124.INTERMITTENT STREAKSCheck high voltage section for corona discharge and arcing.Symptoms shown are assumed and are not indicative of the quality and workmanship of this equipment.6l~o V >sS;!FogSgc vi c ^VHP TUNER TOP VIEWPAGE 21