RCA-21-S-348-Sams-242-8电路原理图.pdf

上传人：cc518

文档编号：173583

上传时间：2023-02-14

格式：PDF

页数：30

大小：16.63MB

《RCA-21-S-348-Sams-242-8电路原理图.pdf》由会员分享，可在线阅读，更多相关《RCA-21-S-348-Sams-242-8电路原理图.pdf（30页珍藏版）》请在收音机爱好者资料库上搜索。

1、PHOTO FACT* Folder VOLUME CONTRAST CONTROL CONTROL ON-OFF SWITCH CHANNEL SELECTOR FINE TUNING RCA VICTOR MODEL 21-S-354 TRADE NAME RCA Victor MODELSCHASSISTUNER MANUFACTURER TYPE SET TUBES POWER SUPPLY TUNING RANGE - 21-S-362M, 21-S-367 KCS83 . , KRK29 21-S-362MU, 21-S-367U KCS83A .KRK29A/27 21-S-35

2、4 KCS83C . . KRK29B 21-S-353, 21-S-355 KCS83C . . KRK29 21-S-353G, 21-S-354G, 21-S-355G, 21-S-357G, 21-S-359G, 21-S-362G KCS83C or KCS83PC - G, KRK29 21-S-367G, 21-S-369G KCS83PK KRK22C 21-S-353U, 21-S-354U, 21-S-355U . KCS83D KRK29A/27 21-S-353GU, 21-S-354GU, 21-S-355GU, 21-S-357GU, 21-S-359GU, 21-

3、S-362GU, 21-S-367GU, 21-S-369GU KCS83D or KCS83PD - GU. KRK29A/27 21-S-348, 21-S-348G KCS83PJ .KRK29 21-S-348G KCS83PL KRK22C 21-S-348GU . . KCS83PM KRK29A/27 RCA Victor Div., Radio Corp, of America, Camden, N.J. Television Receiver Twenty-two 110-120 Volts AC-60 Cycle RATING 1.9 Amp. 117 Volts AC C

4、hannels 2 thru 13 VHF, 14 thru 83 UHF, Video IF 45.75MC, Sound IF 41.25MC (Intercarrier) INDEX Alignment Instructions 5 thru 8 Disassembly Instructions 22 Horizontal Sweep Circuit Adjustments 13 Parts List and Descriptions 15 thru 19 Photographs Cabinet-Rear View 13 Capacitor Identification 4, 9 Cha

5、ssis-Top View 3 RF Tuner 14, 21 Resistor Identification 23, 24 Photographs (Cont) Trans., Inductor ! F o g Sgc vi c VHP TUNER TOP VIEW PAGE 21 RadioFans.CN HORIZ. LINEARITY s y w O I s HORIZ. FREQ. HORIZ. LOCK HORIZ. DRIVE WIDTH CABINET-REAR VIEW HORIZONTAL SWEEP CIRCUIT ADJUSTMENTS HORIZONTAL FREQU

6、ENCY ADJUSTMENT Turn the set on and tune in a TV station, preferably a test pattern. If the picture cannot be synchronized horizontally with the horizontal hold control, adjust the horizontal frequency slug (Bl) until the picture synchronizes. If picture still will not synchronize, adjust the horizo

7、ntal waveform slug (B2) several turns out of the coll and readjust Bl to synchronize the picture. If picture width or linearity is incorrect, adjust the horizontal drive trimmer (B3) and the width control slug (B4) and the horizontal linearity slug (B5) for proper results. HORIZONTAL WAVEFORM ADJUST

8、MENT The horizontal waveform adjustment is made at the factory and normally will require no adjustment. Bl and B2 are adjusted simultaneously while watching the picture. Set the horizontal hold control fully clockwise. Turn Bl until the picture falls out of sync and 3 or 4 diagonal bars sloping down

9、 to the right appears on the screen, Turn B2 clockwise, at the same time adjusting Bl to maintain 3 or 4 diagonal bars on the screen. Continue adjusting Bl and B2 in that manner until the oscillator begins to motorboat, then adjust B2 counter clockwise until the motorboating stops. To check adjustme

10、nt turn Bl until picture synchronizes, then reverse the direction until picture falls out of sync with the diagonal bars sloping down to the right. Continue to turn Bl in the same direction. No additional bars should appear on the screen. Instead the horizontal oscillator should start to motorboar.

11、Retouch B2 until this condition is obtained. To observe the horizontal waveform connect the low capacity probe of an oscilloscope to terminal C of L43. Turn the horizontal hold control 1/4 turn from clockwise so that picture is in sync. The waveform on the scope should appear as in Fig, 12. Adjust B

12、2 for broad and narrow peaks of equal height as in Fig. 12. If necessary, while adjusting B2, keep the picture In sync with the horizontal hold control. Remove the oscillosope. HORIZONTAL LOCKING RANGE ADJUSTMENT With the horizontal hold control infull counter clockwise position, momentarily interru

13、pt the signal by switching off channel and back again. If picture remains in sync turn Bl slightly and again switch off channel, repeating procedure until picture loses sync with diagonal bars sloping down to the left. Slowly turn the horizontal hold control clockwise and note the least number of ba

14、rs obtained just before the picture pulls into sync. If the number is more than three adjust the horizontal locking trimmer (B6) slightly clockwise. If the number is less than two adjust B6 slightly counter clockwise. Recheck as above for the least number of bars and readjust B6 if necessary, until

15、two or three bars are present. Turn the horizontal hold control fully clockwise and adjust Bl until the diagonal bar sloping down to the right appears on the screen, then reverse direction of adjustment of Bl until the diagonal bar just disappears, leaving the picture in synchronization. AGC CONTROL

16、 ADJUSTMENT Connect the vertical amplifier of oscilloscope to pin 9 (plate of the video amplifier (6X8). Connect low side to chassis. Tune in a strong station and adjust scope to observe video waveform. Rotate the AGC control clockwise until sync pulse tips begin to be compressed, then counter clock

17、wise until the compression disappears. ADJUST FOR EQUAL PEAKS FIG. PJg SET 242 FOLDER 8 PAGE 13 RadioFans.CN VHP TUNER-RIGHT SIDE VHP TUNER-LEFT SIDE PAGE 14 RadioFans.CN PARTS LIST PART Ne A47-75K-S KSS-3 A47-500K- FKS-1/4 CONG TRIK1T EQUIVALENT KIT K-2 BASE ELEMENT B13-137X RadioFans.CN TION (cont

18、inued) nt)TRANSFORMERS (SWEEP CIRCUITS) A CENTRALAB PART No. AB-35 ft.K-4 AB-59 (LK-1 MALLORY PART No. U-41 Not Req. SU-50 Not Req. INSTALLATION .NOTES Horiz. Hold Attach to R6A AGC Attach to R7A SHAFTS B17-116 Si Pl-200 (Panel) WTCH 76-1. 75S) ITEM No. T2 T3 T4A B T5 T6 USE Horlz. Output Trans. Ver

19、t. Output Trar.s. Yoke-Horlz. (13.4MH) Yoke-Vert. (37MH) Horlz. Lin. Coll (2-8. 5MH) Width Coll (1.8-13MH) REPLACEMENT DATA RCA Victor PART No. 78201 78202 76616 77697 76442 78205 Stoncor PART No. A-8137 A-8145 D6-9A WC -8 WC-8 Merit PART No. HVO-9 A-3038 MDF-72 MWC-6) MWC-6) Triad PART No. D-19 A-1

20、08X Y-17 WC-12 WC-L2 RCA TYPE No. Holldorson PART No. FB41L Z1802 DF602 Thordorson PART No. T-26S53 EM 4o. 7 18 i9 10 71 12 73 74 15 16 77 78 79 JO il 12 13 84 85 B6 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123

21、 124 125 RATING OHMS IWATT OKI! 5% 2KB 0 Meg 00KB 5% 70KSJ 60B BOOB OK 80KB soon 88KB 8KQ 70KB .2Meg 9KB .2Meg 47KB 4700O 3300B 5% 22KB 18KB 18Kn 22KB 470KH 270KB 18KB 5% 390KB 33KB 5% 8200! 470KB 820KB 5% 470KB 5% 22KB 5% 3300B 15KB 22KB 68KB 150KB 330KB 820KB 330KB 8 2KB 150KB 5% 3900B 1. SMeg 5%

22、18KB 820KB 5% 47KB 5% 2. 2Meg 1 Meg 47B 180B 6 800S2 56KB . B2B 1000 B 560B 560B 100KB | I | 1 | 1 2 a I 2 1 9 I 5 | 9 1 1 f 1 i 1 1 i 1 | 2 2 3 I 1 z 1 1 i 1 2 2 2 2 i 1 a 2 1 REPLACEMENT DATA RCA Victor PART No. 502310 503312 503610 503447 513156 523218 503310 503468 503368 503318 503427 503522 50

23、3339 503512 503347 503247 30733 503322 503318 503318 503322 503447 503427 502318 503439 502333 503282 503447 502482 502447 502322 503233 503315 503222 503368 503415 503433 503482 503433 503382 512415 503239 512518 503318 502482 513347 503522 503510 503047 76639 523268 503356 76382 503210 IRC PART No

24、. BTS-10K 5% BTS-12K BTS-10 Meg BTA-330K 5% BTS-470K BTA-560 BTB-1800 BTS-10K BTS-680K BTS-6800 BTS-68K BTS-18K BTS-270K BTS-2. 2Meg BTS-39K BTS-1. 2Meg BTS-47K BTA-4700 BTS-330 5% BTS-22K BTS-18K BTS-18K BTS-22K BTS-470K BTS-270K BTS-18K 5% BTS-390K BTS-33K 5% BTS-8200 BTS-470K BTS-820K 5% BTS-470K

25、 5% BTS-22K 5% BTS-3300 BTS-15K BTS-22K BTS-68K BTS-150K BTS-330K BTS-820K BTS-330K BTS-82K BTA-150K 5% BTS-3900 BTA-1. SMeg 5% BTS-18K BTS-820K 5% BTA-47K 5% BTS-2. 2Meg BTS-1 Meg BTS-47 BTB-6800 BTS-56K BTS-1000 BTS-560 BTS-560 BTA-100K NOTES Note 2 Note 4 Note 6 Note 3 CD Drill new mounting holes

26、. Connect as auto transformer. (3) Includes the following Items: 6 contact male connector (part #75542), C121 R122, R123, R124. d Enlarge mounting hole. Connected to coded blue and red terminals. Alternate deflection yoke for all chassis with printed circuit IF. HORIZONTAL OUTPUT TRANSFORMER CONNECT

27、ION DATA Use Original Width Coil Unless Replacement Type h Listed Connect Width Coil Across Special Notes ORIGINAL TERMINAL CONNECTIONS 5 4 3 2 1 2 core Part * 76543 Includes stator com- plete with rotor core Part * 77914 Includes stator com- plete with rotor, colls, L15, L17, C19, C21, core Part t

28、77914 o V c tn O o 09 l W M _ Ul i w o (CONTD ON NEXT PAGE) PAGE 17 RadioFans.CN PARTS LIST core Part * 77914 Includes stator com- plete with rotor, coils, L21, C26 Note 3 Includes 27KSZ resistor 1. 36 Microhenries See Note 2 1. 36Microhenries See Note 2 1. 36 Microhenries See Note 2 120 Microhenrie

29、s 250 Microhenries RCA Part # includes C55 250 Microhenries; Wound on 27Kn resistor 250 Microhenries; wound on 6. 8KS2 resistor 120 Microhenries; wound on 22Kn resistor 500 Microhenries Includes 22MMF capacitor horiz. waveform winding=40n 1. 5 Microhenries; Part if CL-1 Note 1. Complete antenna matc

30、hing transformer (Part # 78396); includes LI & L2. Note 2. Chassis KCS83PC, KCS83PD, KCS83PJ, KCS83PK, KCS83PL, KCS83PM, use printed circuit type of IF transformers replaceable with one unit. Unit includes L29, LSI, & L33. Note 3. Not used in all models. t Use one winding only. * Parallel with 27KS7

31、 resistor, * Parallel with 6. 8KSi resistor. * Parallel with 22KS2 resistor. FILTER CHOKE ITEM No. L45 RATINGS TOTAL DIRECT CURRENT .280ADC D. C. RESISTANCE 38n INDUCTANCE (0 CURRENT 1000 /, 1.06 Hy. REPLACEMENT DATA RCA Victor PART No. 77676 Stoncor PART No. C-2326Q) Merit PART No. C-2996QD Triad P

32、ART No. C-17X Q Halldorson PART No. C5037Q) Thordarson PART No. F-26C44CJ) (I) Drill one new mounting hole. FUSES ITEM No. Ml TYPE SAG RATING 3/10A REPLACEMENT DATA RCA Victor PART No. FUSE 78214 HOLDER 78218 LITTELFUSE PART No. FUSE 312. 300 (3AG-3/10A) HOLDER 357001 BUSS PART No. FUSE AGC 3/10 HOL

33、DER 4405 CRYSTAL DIODES ITEM No. M2 ORIG. TYPE 1N82 REPLACEMENT DATA RCA Victor PART No. SYLVAN IA PART No. 1N82 or A FEDERAL PART No. NOTES UHF Mixer PAGE 18 RadioFans.CN PARTS LIST & DESCRIPTION (continued) MISCELLANEOUS ITEM No. M3 M4 M5 M6 M7 MS M9 M10 B3, B6 A9 PART NAME Dial Light Tuner Tuner

34、Tuner Switch Focus Magnet Ion Trap Correction Magnet Trimmer Cap. Trimmer Cap. Knob Knob Knob Knob Knob Knob Knob Knob Knob Knob Knob Knob Knob Knob Knob Knob Knob Knob Knob Knob Safety glass Safety glass Safety glass RCA Victor PART No. 11765 78211 76168 76141 76633 75217 78220 77699 77719 77708 79

35、078 79085 77708 79077 79081 77707 77717 77735 77736 79080 77709 77718 79079 79072 77710 78343 78342 78329 78815 78314 NOTES #51 (Not used on Model 21-S-348G) KRK29 (VHF only) KRK22C (VHF only) KRK29A/27 (VHF/UHF) TV-phono tone (Not used on Model 21-S-348G) Includes centering device (2 Used) Dual 10-

36、160MMF (Horiz. Drive & horiz, lock) 5-70MMF (IF input coupling) Brightness - brown Brightness - med. beige Channel Selector (inner) Channel Selector (ebony)- KRK29, KRK29A/27 Channel Selector ( maroon) KRK29, KRK29A/27 Channel Selector KRK29 tuner (inner) Fine tuning - saiidtone - KRK29 Fine tuning

37、- sandtone - KHK29A/27 Fine tuning brown - KRK29 Fine tuning - Med. beige - KRK29 TV-Phono tone - brown TV-phono tone - med. beige Picture - sandtone Picture - brown Picture - med. beige Volume - ebony Volume - maroon Volume - inner VHF fine tuning & UHF channel selector - brown VHF fine tuning & UH

38、F channel selector - med .beige For metal table models Models 21S326G, 67G, 69G Models 21S362M & MU := (o) / vSy / HORIZ s VS N / FREO HORIZ HORIZ AGC / LOCK DRIVE s HORIZ. LIN. WIDTH HORIZONTAL OSCILLATOR FIELD ADJUSTMENT Adjustment of the horizontal oscillator circuit can be made from the rear pan

39、el of the chassis. Set the horizontal hold control at the mid-position of Us range and adjust the horizontal frequency slug (L43) until the picture synchronizes horizontally. If synchronization cannot be obtained by the above adjustment see Horizontal Sweep Circuit Adjustments on page 13. SOUND IF D

40、ETECTOR BUZZ ADJUSTMENT To eliminate Sound IF Detector Buzz, adjust the ratio detector secondary (L42) located on top of chassis. (See tube placement chart). FUSES One fuse is used for horizontal sweep circuit protection. (For location, see tube placement chart) . CENTERING Centering is accomplished

41、 mechanically by means of a centering lever on the PM focusing assembly. Adjust the centering lever from side to side, and up and down until the picture is properly centered. ANTI-PIN CUSHION ADJUSTMENT Reduce the picture size so that the sides of the raster are visible, and position the magnets so

42、that all sides are straight lines and the corners are at right angles. DISASSEMBLY INSTRUCTIONS 1. Remove 6 push on type control knobs from front panel. 2. Disconnect transmission lines. 3. Remove 2 metal screws and 2 snap clips. Remove rear cover. 4. Disconnect speaker plugs, yoke plug, CRT socket,

43、 and HV plug. 5. Remove 5 chassis bolts. Remove chassis. 6. Remove 4 speaker nuts. Remove speaker. PAGE 22 RadioFans.CN CHASSIS BOTTOM VIEW-RESISTOR ID PAGE 23 RadioFans.CN I VIEW-RESISTOR IDENTIFICATION PAGE 24 RadioFans.CN A PHOTOFAa STANDARD NOTATION SCHEMATIC Howard W. Som. & Co., Inc. 1954 o in M Ui ALTERNATE TUNER SCHEMATIC RadioFans.CN