RCA-8T270-Sams-85-13电路原理图.pdf

PHOTO FACT* Folder RCA VICTOR MODELS 8T27O, 8TC27O, 8TC271, 8TK320, 9T27O, 9TC272, 9TC275 .77 BRIGHTNESS CONTRAST CHANNEL. SELECTOR FINE TUNING VOLUME TONE ON-OFF SW. RCA VICTOR MODEL 9TC272 MANUFACTURER RCA Victor Div., Radio Corp. of America, Camden, New Jersey TYPE SET AM-FM-Phono-TV Combination Receiver (Some Models TV only). TUBES Thirty Two (Combination Models) Twenty Seven (TV only Models) POWER SUPPLY 110-120 Volts AC-60 Cycles RATING TUNING RANGES AM 540-1600KC FM 88-108MC TV Channels 2 thru 13 TRADE NAMERCA Models 8T270, 8TC270, 8TC271 (Ch. KCS29, A), 8TK320 (Ch. KCS33A-1 and Radio chassis RK-135A-1) 9T270, 9TC272, 9TC275 (Ch. KCS29, C) 2.3 Amp. at 117 Volts AC (TV Operation) Alignment Instructions 8, 9,10 Block Diagram 17 Critical Lead Dressing 14 Dial Cord Stringing 23 Disassembly Instructions 23 Horizontal Sweep Circuit Adjustment 24 Parts List and Description 18 thru 22 Photographs Cabinet-Rear View 14 Capacitor Identification 15, 26 INDEX Photographs .(continued) Chassis-Top View 3 RF Tuner (AM-FM) 1 RF Tuner (TV) 6 Resistor Identification 16, 25 Trans., Inductor and Alignment Identification. 4,13 Schematic (Radio) U Schematic (TV) 2 Tube Placement Chart 5 Voltage and Resistance Measurements 12 oo K m SK 00 o -I H K) r s K O N* OD o r S!j SJ ,8 Ui HOWARD W. SAMS AC Voltoge measured at 1,000 2. Pin numbers are counted in a clockwise direc- tion on bottom of socket. 3. Measured values are from socket pin lo com- mon negative unless otherwise slated. 4. Line voltage maintained at 117 volts for volt- oge readings. 5. Front panels controls set at minimum. 6. Where readings may vary according to the setting of the service controls, both minimum t MEASURED FROM PIN 8 OF V25. I MEASURED FROM PIN 8 OF V22. I MEASURED FROM PIN 6 OF V20. . MEASURED FROM PIN 5 OF V8. TAKEN IN AM POSITION. + TAKEN IN FM POSITION. RadioFans.CN HEIGHT FOCUS VERT. BIAS HORIZ. LIN. CONTROL LOCK CBS WIDTH SW. CABINET-REAR VIEW CRITICAL LEAD DRESSING 1. The ground bus from pin 2 and the center shield of V12 socket should not be shortened or rerouted. 2. Dress the body of R62 as close to tube pin as possible. 3. Do not change the dress of the filament leads or the by- pass capacitors in the picture or sound IF circuits. The filament leads between V12, V13 and V14 should be down against the chassis and away from grid or plate leads. 4. Dress all leads crossing the IF circuits close to the chassis, and held so they cannot move and change alignment. 5. If it is necessary to replace any of the 1500MMF capaci- tors in the picture IF circuit, the lead length must be kept as short as possible. 6. Picture IF coupling capacitors C30, C35, C41 and C48 should be up and away from the chassis and should be clear of the picture IF transformer adjustments by at least | inch. If the dress of any of these capacitors is changes, the IF alignment should be rechecked. 7. Leads to LSI and L32 must be as short as possible. 8. Dress peaking coils L34, L35, L36, L37 and L38 up and away from the chassis. 9. Dress R13 away from L38. 10. Dress C63 and V13 tube pins 5 and 6 with leads not exceeding 3/8 inch. 11. Dress the blue lead from pin 5 of V14 down against the chassis and under two shielded leads. 12. Dress C55 and C54 up and away from the chassis. 13. Dress the yellow lead from the picture control away from the chassis. Dress the yellow lead from pin 8 of V9 away from the chassis. 14. Dress the green lead from pin 8 of V10 away from the chassis. 15. Dress R101, R100, R104 and R102 up and away from the chassis. 16. The leads to the volume control should be dressed down against the chassis and away from Vll and V12. 17. Dress the yoke red horizontal deflection lead under the clips of the fixed H. V. shield. 18. Dress the green lead from C106 close to the chassis and away from the red lead connected to T4 . 19. Insert the red lead into T4 from the top of the terminal. 20. All soldered connections in the high voltage compartment should be free of sharp points. 21. Contact between the RF oscillator frequency adjustment screws and the oscillator coils or channel switch eyelets must be avoided. PAGE 14 RadioFans.CN CHASSIS BOTTOM VIEW-CAF PAGE 26 RadioFans.CN -CAPACITOR IDENTIFICATION PAGE 15 RadioFans.CN CHASSIS BOTTOM VIEW-RE PAGE 16 RadioFans.CN -RESISTOR IDENTIFICATION PAGE 25 RadioFans.CN AF AMP. 1/2 V14 AUDIO OUTPUT VI5 1st VIDEO IF 2nd VIDEO IF 3rd VIDEO IF 4th VIDEO IF VIDEO AMP. V9 VIDEO OUTPUT V10 RF TUNER MIXER OSC 1st SYNC SEP. 1/2 V17 SYNC LIMITER I /2 V 8 SYNC AMP. 1/2 V18 2nd SYNC SEP. 1/2 V18 AGC RECT. 1/2 V17 AGC AMP. 1/2 V16 BIAS CLAMPER 1/2 HOR. AFC HOR. OSC HOR. OUTPUT DAMPER HV RECT. HV RECT. LV RECT. V25 LV RECT. o m N BLOCK DIAGRAM SZC316 Z/.Z316 QLL16 OCOIJ.8 1/. 2 1 2 1 i REPLACEMENT DATA RCA PART No. 74156 74156 74197 74155 48207 74213 74265 74023 74023 IRC PART No. BTS-1 Meg. BTS-6800 BTS-3.9 Meg. BTS-22K BTS-8200 BTS-8200 BTS-1. 5Meg. 5 BTS-220K BTS-2.2Meg. BTS-100K BTS-56K BTS-2.2 Meg. BTS-1200 BTS -8200-5% BTS-1000 BTS-820K-5% BTS-150K BTA-150K-5% BTS-8200 BTA-2.7Meg. ! BTS-82K BTA-150K-5% BTA-100K-5% BTS-8200-5% BTS-22K BTA-100K BTS-150K BTS-10K BTS-1 Meg. BW-2-150 BTA-5600 BTS-3300 BTS-560K BT-2-100K AB-450 AB-350 IVB-450 AB-3500 AB-800 DG-350 BTS-3.9 Meg. BTS-27K BTS-18K BTS-15K BTS-27K BTS-680 BTS-22 Meg. BTS-150K BTS-150K BTS-2.2 Meg. BTS-47K BTS-15K BTS-680 BTS-15K BTS-3300-5% BTS-1200 BTS-39K-5% BTS-470K BTS-10K Note 2. Not used in all models. Note 3. Model 8TK320 uses 27Kn resistor in this appl Note 4. Used in model 8TK320 only. Note 5. Model #TK320 uses 820Kft resistor in this apf Note 6. Items C128A, C128B and R144 are combined in SP ITEM No. SP1A B C SP2A B C RATINGS FIELD PM PM PM CONE DIA. 11 3 /4 11 3 /4 8 V. C. IMP. 40 4O 40 V. C. DIA. 1 1 REPLACEMEN RCA PART No. 73635 74355 74169 73934 ffi) 73934 73912 JENS! PART 1 ST-101 I MOD.P ST-101 MOD.P PAGE 2O RadioFans.CN PARTS LIST AND DESCRIPTIONS (Continued) STALUTION NOTES front rear ins in Concentrikit front ;ar 3ns in Concentrikit. ir, tapped at 200KJ1 3ns in Concentrikit. 3tel switch tapped at 500KSJ and 250KSJ ; Wound rol Wire Wound trol, tapped at 10S2, Wire Wound fitrol, Wire Wound IFICATION CODES 0% UNLESS OTHERWISE STATED r Shunt SeeNote 2 pling iund Ote3 RESISTORS CCONT.J ITEM No. R85 R86 R87 R88 R89 R90 R91 R92 R93 R94 R95 R96 R97 R98 R99 R100 R101 R102 R103 R104 R105 R106 R107 R108 R109 R110 R1U R112 R113 RU4 R115 R116 R117 R118 R119 R120 R121 R122 R123 R124 R125 R126A B C D R127 R128 R129 R130 R131 R132 R133 R134 R135 H136 R137 R138 R139 R140 R141 R142 R143 R144 RMS R146 RUT RMS R149 R150 R151 R152 R153 R154 R155 R156 RATING RESISTANCE 1 Meg. 20% 68000 3. 9 Meg. 22KO 8200O 8200O 1. 5 Meg. 5% 220KS! 2.2 Meg. 100KO 56Kn 2. 2 Meg. 12000 8200O 5% 1000SJ 20% 820KO 5% 150KO 150KO 5% 82000 2. 7Meg. 5% 82Kn 150KO 5% 100KSJ 5% 8200O 5% 22KSJ lOOKfl 150KO 10KSJ 47n 20% IMeg. 150n 56000 3300O 3.9O 3.90 180KO 180KO 180KO 560KO 100KO 20% 470n 775n 550n 350n 450n 3300n 820n 180KO 330n ion 3. 9 Meg. 27KO 18KO lOOn 15Kn 68P, 27KJJ 6800 22 Meg. 150KO 150KO 2. 2 Meg. 47KO 1200 15KB 68 OSJ ioon 15KO 3300SJ 5% 12000 39KO 5% 470Kn 10KO .510 .5ln WATTS i 2| | 3 Z I I ?I 2 I i 2 I g 1 i 1 2- 1 1 | 5 1 I z 1 I 2 1 2 2 2 2 2 2 4 9.5 ) 5 ( 3 ( 5 ) 10 10 g 20 2 i 2 i 2 2 I 5 2 1 i 2 1 i 2 i | 1 i a A I 2 REPLACEMENT DATA RCA PART No. 74156 74156 74197 74155 48207 74213 74265 74023 74023 IRC PART No. BTS-1 Meg. BTS-6800 BTS-3.9 Meg. BTS-22K BTS-8200 BTS-8200 BTS-1. 5Meg. 5% BTS-220K BTS-2. 2 Meg. BTS-100K BTS-56K BTS-2. 2 Meg. BTS-1200 BTS-8200-5% BTS-1000 BTS-820K-5% BTS-150K BTA-150K-5% BTS-8200 BTA-2.7Meg. 5% BTS-82K BTA-150K-5% BTA-100K-5% BTS-8200-5% BTS-22K BTA-100K BTS-150K BTS-10K BTS-1 Meg. BW-2-150 BTA-5600 BTS-3300 BTS-560K BT-2-100K AB-450 AB-350 AB-450 AB-3500 AB-800 DG-350 BTS-3.9 Meg. BTS-27K BTS-18K BTS-15K BTS-27K BTS-680 BTS-22 Meg. BTS-150K BTS-150K BTS-2. 2 Meg. BTS-47K BTS-15K BTS-680 BTS-15K BTS-3300-5% BTS-1200 BTS-39K-5% BTS-470K BTS-10K IDENTIFICATION CODES Sync. Amp. Grid 2nd Sync. Sep. Cathode 2nd Sync. Sep. Grid Integrator Integrator Integrator Vert. Osc. Grid Vert. Osc. Plate Voltage Divider Voltage Divider Filter Vert. Output Grid Vert. Output Cathode Vert. Peaking Vert. Output Decoupling Horiz. AFC Grid Horiz. AFC Cathode Horiz. AFC Cathode Horiz. AFC Filter Network Voltage Divider Voltage Divider Voltage Divider Horiz. Osc. Grid Horiz. Osc. Transformer Shunt Horiz. Osc. Transformer Shunt Horiz. Osc. Plate Horiz. AFC Filter Network Filter Parasitic Supp. Horiz. Output Grid See Note 5 Horiz. Output Cathode Horiz. Output Screen Horiz. Output Screen HV Rect. Filament-Wire Wound HV Rect. Filament-Wire Wound HVRect. Load HVRect. Load HV Rect. Load Feedback Isolation Focus Coil Shunt-Wire Wound Voltage Divider-Wire Wound Voltage Divider -Wire Wound Bias Network-Wire Wound Bias Network-Wire Wound Bleeder Network-Wire Wound Bleeder Network-Wire Wound Horiz. Output Grid See Note 4 Bias Network, Wire Wound -See Note 4 Parasitic Supp. Conv. Grid Conv. Plate Decoupling Osc. Grid Parasitic Supp. Osc. Plate Decoupling 1st IF Cathode 1st IF Screen Decoupling Delayed AVC Diode Load AVC Network AVC Network Diode Filter See Note 6 2nd FM IF Cathode 2nd FM IF Screen 2nd FM IF Decoupling Balancing De-emphasis Ratio Det. Diode Load Balancing Ratio Det. Diode Load AVC Network De-emphasis Filament Dropping-Wire Wound Filament Dropping-Wire Wound Note 2. Not used in all models. Note 3. Model 8TK320 uses 27Kfl resistor in this application. Note 4. Used in model 8TK320 only. Note 5. Model 8ITK320 uses 820KO resistor in this application. Note 6. Items C128A, C128B and R144 are combined into one unit obtainable under MFGRS Part No. 74011. SPEAKER ITEM No. SP1A B C SP2A B C RATINGS FIELD PM PM PM CONE DIA. 11 3 /4 11 3 /4 8 V. C. IMP. 4n 4O 40 V. C. DIA. 1 1 REPLACEMENT DATA RCA PART No. 73635 74355 74169 ffi 73934 73934 73912 JENSEN PART No. ST-101 MOD.P12-T ST-101 MOD.P12-T GUAM PART No. 12A31A 12A31A INSTALLATION NOTES Replace output transformer to match 6-8O voice coil. (D Used in models 9TC272 and 9TC275. f used in model 8TK320. Used in model 9T270 ITEM No. Tl RATING PRI. 117VAC at2.3A SEC. 1 760VCT . 270ADC SEC. 5VAC at 6A (Q) Rewire heater circui ITEM No. T2 T3 T4 T5 T6A B C D T7A B RATING DC RESISTANCE PRI. 125JJ Tap at 900 165O 1120 Tap at 87JJ 521SJ 13O 640 13. 5!J 64. 6O 4200 SEC. 360 1310O SEC. 1 8.40 Tap at 6O SEC. 2 on SEC. 3 on 6.90 R p/ 73E 741 741 735 741 742 741- 742 Drill one new mounting hole Drill new mounting holes. Used in models 9T270, 272 Used in model 8TK320. ITEM No. T8A B C RATING IMPEDANCE PRI. 8KO 5.8KO SEC. 4n 4.20 DC RES. PRI. 6500 soon SEI .50 .26f ITEM No. LI RATINGS TOTAL DIRECT CURRENT .270A D. C. RESISTANCE 430 ITEM No. L2 L3 L4 L5 L6 L7A B L8 L9 L10 L11A B L12 L13 L14A B L15 L16 .L17 L18A B USE Ant. Input Trans. IF Trap IF Trap Shunt IF Trap RF Grid Coils RF Plate Trimmer Coil RF Plate Trimmer Coil RF Plate Coils RF Plate RF Coupling Mixer Grid Trimmer Coil Mixer Grid Trimmer Coil Mixer Grid Mixer Grid Osc. Plate Trimmer Coil Osc. Plate Trimmer Coil Osc. Plate Coils Osc. Plate Coils Osc. Plate Fine Tuning Fine Tuning DC RES. PRI. on on on on on on on 00 on on on on oo on 00 on on on on on on SE RadioFans.CN PTIONS (Continued) IDENTIFICATION CODES c. Amp. Grid Sync. Sep. Cathode Sync. Sep. Grid grator grater grator t. Osc. Grid t. Osc. Plate tage Divider tage Divider ter t. Output Grid t. Output Cathode t. Peaking -t. Output Decoupling iz. AFC Grid -iz. AFC Cathode -iz. AFC Cathode iz. AFC Filter Network tage Divider tage Divider tage Divider -iz. Osc. Grid iz. Osc. Transformer Shunt iz. Osc. Transformer Shunt iz. Osc. Plate -iz. AFC Filter Network ter -asitic Supp. iz. Output Grid See Note 5 iz. Output Cathode iz. Output Screen iz. Output Screen Rect. Filament-Wire Wound Rect. Filament-Wire Wound Rect. Load Rect. Load Rect. Load dback lation :us Coil Shunt-Wire Wound ;tage Divider-Wire Wound .tage Divider-Wire Wound .s Network-Wire Wound .s Network-Wire Wound eder Network-Wire Wound ieder Network-Wire Wound riz. Output Grid See Note 4 is Network, Wire Wound -See Note 4 rasitic Supp. nv. Grid nv. Plate Decoupling c. Grid rasitic Supp. c. Plate Decoupling IF Cathode IF Screen coupling layed AVC de Load C Network C Network ide Filter See Note 6 I FM IF Cathode 1 FM IF Screen I FM IF Decoupling lancing -emphasis :io Det. Diode Load lancing :io Det. Diode Load C Network -emphasis ament Dropping-Wire Wound ament Dropping-Wire Wound lit obtainable under MFGRS Part No. 74011. GUAM ART No. !A31A 1A31A INSTALLATION NOTES Replace output transformer to match 6-8n voice coil. Used in models 9TC272 and 9TC275. Q Used in model 8TK320. Used in model 9T270 TRANSFORMER (POWER) ITEM No. Tl RATING PRI. mvAC at2.3A SEC. 1 760VCT . 270ADC SEC. 2 5VAC at 6A SEC. 3 5VAC at 2A SEC. 4 6.3VAC at8.9A REPLACEMENT DATA RCA PART No. 74143 STANCOR PART No. P-8156 MERIT PART No. P-3061 CHICAGO PART No. 00 ft N ijp S O ft 01x PAGE 21 RadioFans.CN PARTS LIST AND DESCRIPTIONS (Continued) COILS CRF-IF)CONr. ITEM No. L19 L20 L21 L22 L23 L24 L25 L26 L27 L28 L29 L30 L31 L32 L33 L34 L35 L36 L37 L3B L39 L40 L41 L42 L43 L44 L45 L46 L47 L48 L49 USE Fil. Choke Fil. Choke Fil. Choke onv. Trans. st Video IF Fil. Choke 2nd Video IF 3rd Video IF and Sound Take-Off Peaking 4th Video IF Sound Trap 5th Video IF Peaking Peaking 4. SMC Trap Peaking Peaking Peaking Peaking Peaking Sound IF Disc. Trans. Width Cont. Hor. Line- arity FM Ant. AM Ant. FM Osc. AM Osc. 1st IF FM AM 2nd IF FM AM Ratio Del. Trans. DC RES. PRI. on 00 Of1 on on or! .in .in 3t .in on .in 50 9 2 7 4 6 8. 50 en sn 5O 1 sn on on 3 20 sn on 240 on in a 30 n .80 7n ITEM No. Ml M9 MIO BASE TYPE bayonet Bayonet Bayonet ITEM No. M2 M3 M4 MS M6 M7 MS M11A B M12 M13 M14 9S! SEC. on .in on on on 2n 6.50 .30 80 .sn 70 .sn REPLACEMENT DATA RCA PART No. 73477 73477 73477 73448 73571 73477 73572 73573 74170 73574 71778 73575 71529 71526 73577 71528 74214 71527 71529 71528 71424 71422 71429 71449 74024 74020 74025 73744 73745 74019 73743 VOLTS 6-8 6-8 6-8 AMPS. .2 0. 2A 0.2A PART NAME RF Tuner Switch Switch Switch Fuse Fuse Ion Trap Core Cord Socket Cabinet Back Cabinet Back Cabinet Back Escutcheon Escutcheon Safety Glass Safety Glass Safety Glass Mask Mask Knob Knob Knob Knob Knob Knob Knob Knob Knob Knob Knob Knob Knob Knob Knob Knob Knob Knob Trimmer Selector Switch Selector Switch Switch Switch Tuning Cap. Knob Knob Bezel MEISSNER PART No. NOTES Includes 22Kn resistor. Includes lOKn resistor and 82MMF capacitor. Includes 47MMF capacitor. Includes 47MMF capacitor. 36 microhenries. Wound on 8. 2Kn resistor. Includes 36MMF capacitor. Includes 75MMF capacitor. Includes 56MMF and 8.2MMF capacitor. 120 microhenries. Wound on 22KO resistor. 250 microhenries. Includes 47MMF capacitor. 180 microhenries. Wound on 39KO resistor. 180 microhenries . 93 microhenries. 120 microhenries. Wound on 22KO resistor. 180 microhenries. Wound on 39KO resistor. Includes 10MMF and 33MMF capacitors. Includes 56MMF, 47MMF and 56M