RCA-21T176-Sams-157-8电路原理图.pdf

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1、PHOTO FACT* Folder RCA MODELS 21T176, 21T177, 21T178, 21T179 VERT. HOLD CONTROL HORIZ. HOLD CONTROL CONTRAST; CONTROL BRIGHTNESS CONTROL VOLUME CONTROL ON-OFF SW RCA Victor 21TI78 TV-PHONO TONE CONTROL FINE TUNING STATION SELECTOR SWITCH TRADE NAME RCA Victor Models 21T176, 21T177, 21T178, 21T179, (

2、Chassis KCS68C,CB) MANUFACTURER RCA Victor Div., Radio Corp. of America, Camden, N. J. TYPE SET Television Receiver TUBES Twenty Five POWER SUPPLY 110-120 Volts AC - 60 Cycle TUNING RANGEChannels 2 thru 13 RATING 2.7 Amp. INDEX Alignment Instructions . . 6, 7 Disassembly Instructions 8 Horizontal Sw

3、eep Circuit Adjustments 10 Parts List and Descriptions 13 t hru 16 Photographs Cabinet - Rear View.10 Capacitor and Alignment Identification 4,9 Chassis - Top View 3 Photographs (cont.) High Voltage Supply 18 RF Tuner . 11,18 Resistor and Inductor Identification 12,17 Resistance Measurements 8 Schem

4、atic 2 Tube Placement Charts 5 o o m to 3 N 10 N CO K HOWARD W. SAMS )6SN7GT (ran) j VERT SfflC AMP 6SN7GT VW-K 4-WV-l VERT. HOLD . (fHlJ CONTROL HEIGHT EG CONTROL PHONO TONE SWITCH SHOWN TV, WIN. HIGHS POSITION SWITCH SEQUENCE I- TV MIN. HIGHS Z-TV NORMAL. 5- TV MIN. LOWS 4- PHONO MIN. HIGHS 5- PHO

5、NO NORMAL 5- PHONO MIN.LOWS 0v HORIZ OUTPUT PiP 6CD6G SURED WITH VTVM SUREO FROM 130 VOLT LINE RadioFans.CN MODELS 2TT176, 21T177, 21T178, 21T179 RadioFans.CN CHASSIS TOP VIEW PAGE 3 RadioFans.CN CHASSIS BOTTOM VIEW-CAPACITOR PAGE 4 RadioFans.CN OR AND ALIGNMENT IDENTIFICATION PAGE 9 RadioFans.CN 3

6、s TOP VIEW TUBE PLACEMENT CHART PAGE 5 RadioFans.CN ALIGNMENT INSTRUCTIONS ALIGNMENT INSTRUCTIONSREAD CAREFULLY BEFORE ATTEMPTING ALIGNMENT The high voltage shock hazard may be eliminated by removing the horizontal oscillator tube, (V18), from its socket. VIDEO IF ALIGNMENT 1. 2. 3. 4. 5. 6. 1. 8. 9

7、. Connect the ends of a IOOOS1 potentiometer across a 7.5 Volt battery capable of withstanding considerable current drain. Connect the positive end of the battery to chassis. Connect the center arm of the potentiometer to the junction of R95 to chassis. up. to point side to chas- ADJUST Al A2 A3 A4

8、A5 A6 A7,A8 ASaAlO REMARKS Set bias pot. to -IVoIt, Adjust for MINIMUM deflection. Attenuate signal gen. to main- tain -IVolt reading. Adjust for maximum deflection. Attenuate signal gen. to maintain 1 volt reading. Connect 330S2 resistor across R37, R38 and terminals A1 and Vof M6. Adjust for resp-

9、 onse curve similar to fig. I. Attenuate sweep gen. to maintain . 5 volt peak to peak response. Leave 330J3 resistors connected. Connect a 180n resistorbetween pin 5 of V3 and junction of R29 and C40. Adjust for response similar to fig. 3. Remove all damping resistors. Set IF bias to -6 volts. Check

10、 for response curve similar to fig. 4. If necessary retouch A4 and A5 for proper response. Retouch A6 only if absolutely necessary. Incorrect adjustment of A6 will interfere with trap action. F IG.4 FIG.5 ator. ADJUST A14 A15 A16 A17.A18 A19 REMARKS Adjust for maximum deflection on VTVM. Adjust sign

11、al gen. to obtain 10 volt reading. Adjust for MINIMUM 4001 indication on scope. Repeat steps 10 and 11. Check the voltage at poinK). II the voltage exceeds 1. 5 volts, adjust A16 for zero voltage on VTVM between positive and negative peaks. Repeat adjustment of A15 and A16 until VTVM reads less than

12、 1 1. 5 volts with A15 adjusted for MINIMUM 4001 indication on scope. Adjust for maximum amplitude and symmetry as per Fig. 5. 300-r BALANCEDTO 300j L-WV lent should not be attemp required equipment cons nch. Misalignment of th will not effect the alignm mid be realigned, of L8 is alignment Poin mp.

13、 thru de- trobe to , Low side A17 A18 A19.A20 ted unless it has been definitely established sts of a sweep generator capable of at least is unit can cause serious attenuation of the ;nt, Sy, as shown on the schematic. Adjust for MINIMUM 400 indication or scope. Adjust for MINIMUM 400% indication or

14、scope. Connect a 3000 resistor from Pointto chassis. Adjust for response curve similar to Fig. 7. A19 controls the placement of the shoulder. A20 is adjusted to give maximum amplitude of .53MC marker consistant with curve shape shown in Fig. 7 . Repeat steps 14, 15 75877 73960 39644 39644 76532 7647

15、3 73595 73920 73797 73808 73561 73599 47617 73561 73920 73562 73561 75643 75643 45233 73561 73595 73920 73594 73592 74957 73803 73562 73563 73557 73551 73798 75643 45233 73090 44202 73787 73562 73553 73592 73090 76579 73594 76508 73801 73592 73787 76577 73815 73815 73787 76575 76578 76488 73561 7657

16、9 75071 75071 73748 AEROVOX PART No. P688-0047 SI47N750 S13NPO P488-22 BPD-01 BPD-01 1468-0001 BPD-01 P488-1 P688-0047 BPD-01 BPD-01 1 BPD-01 _J BPD-01 TbPD-01 BPD-01 BPD-01 1468-0005 1468-0005 1468-00035 P688-0022 P6B8-0047 P288-015 P488-01 P688-003 SI270 P488-01 P688-0047 P488-022 P488-01 P688-001

17、 P688-001 SHOO P488-01 P688-0022 P688-0047 P688-01 P688-047 684-25 P1088-0022 P488-022 P488-022 P688-1 P488-1 P688-022 P688-001 SHOO SI150 P288-47 P488-022 P488-047 P688-047 1469-0003 P688-01 P688-0015 P1088-001 P688-047 P288-47 P1088-068 P1088-068 P288-47 P488-01 1468-0003 P488-047 P488-047 BPD-001

18、5 SI150 CENTRALAB PART No. D6-472 TCN-47 TCN-15 DD-103 DD-103 D6-101 DD-103 DF-104 D6-472 DD-103 DD-3-103 DD-103 TCN-56 DD-103 DD-103 DD-103 D6-471 D6-471 829-4 D6-331 D6-222 D6-472 D6-103 D6-272 D6-271 D6-103 D6-472 DF-203 D6-103 D6-102 D6-102 D6-101 D6-103 D6-222 D6-472 D6-103 DF-503 DF-203 DF-203

19、 DF-104 DF-104 DF-203 D6-102 D6-101 D6-151 DF-203 DF-503 DF-503 )6-103 J6-152 )F-503 TV1-503 D6-103 D6-271 DF-503 DF-503 DD-152 D6-151 CORNELL- DUBILIER PART No. PTE6D5 GT4P2 1D3S1 1D3S1 5W5T1 1D3S1 PTE4P1 PTE6D5 1D3S1 1D3S1 1D3S1 D3S1 1D3S1 1D3S1 1D3S1 5W5T5 5W5T5 PTE6D2 PTE6D5 PTE6S15 PTE4S1 PTE6D

20、3 5W5T3 PTE4S1 PTE6D5 PTE4S2 PTE4S1 PTE6D1 PTE6D1 5W5T1 PTE4S1 PTE6D2 PTE6D5 PTE6S1 PTE6S5 GP6P25 PTE16D2 PTE4S2 PTE4S2 PTE6P1 PTE4PI PTE6S2 PTE6D1 5W5T1 5W5T15 GT2P5 PTE4S2 PTE4S5 PTE6S5 5R5T3 PTE6S1 PTE6S5 3T2P5 3T2P5 PTE4S1 5W5T3 PTE4S5 TE4S5 1W5D15 5W5T15 ERIE PART No. GP2-333-472 N750K-470 N750

21、K-150 NPOK-030 821-01 821-01 GP1K-01 821-01 GP2-333-472 821-01 821-01 821-01 821-01 N750K-560 821-01 821-01 821-01 GP2K-471 GP2K-471 532-08-OR5 GP2K-331 GP2-333-222 GP2-333-472 GP2-333-I03 GP2-333-272 GP2K-271 GP2-333-103 GP2-333-472 GP2-333-103 GP2L-102 GP2L-102 GP1K-101 GP2-333-103 GP2-333-222 GP2

22、-333-472 GP2-333-103 GP2L-102 GPLK-101 GP2K-151 GP2-333-103 GP2L-152 3P2-333-103 GP2K-271 801-0015 3P2K-15I SPRAGUE PART No. 6TM-S47 5TCU-Q47 5TCU-Q15 4TM-P22 5HK-S1 5HK-S1 1FM-31 5HK-S1 4TM-P1 6TM-D47 5HK-S1 5HK-S1 5HK-S1 5HK-S1 5HK-S1 5HK-S1 5HK-S1 1FM-35 1FM-35 1FM-335 6TM-D22 6TM-D47 6TM-S15 4TM

23、-S1 6TM-D3 5GA-T27 4TM-S1 6TM-D47 4TM-S22 4TM-S1 6TM-D1 6TM-D1 5GA-T1 4TM-S1 6TM-D22 6TM-D47 6TM-S1 6TM-S47 6TM-P25 MB-D22 4TM-S22 4TM-S22 6TM-P1 4TM-P1 6TM-S22 6TM-DI 5GA-T1 5GA-T15 2TM-P47 4TM-S22 4TM-S47 6TM-S47 MS-33 6TM-S1 6TM-D15 6TM-S47 2TM-P47 2TM-P47 4TM-S1 MS-33 4TM-S47 4TM-S47 5HK-D15 5GA

24、-T15 IDENTIFICATION CODES AND INSTALLATION NOTES Video Amp. Cathode Contrast Cont. Shunt Contrast Cont. Shunt Contrast Cont. Shunt Video Coupling AGC Filter AGC Filter Voltage Divider Horiz. Feedback AGC Cathode AGC Filter AGC Filter Sound IF Grid Filter 1st Sound IF plate 1st Sound IF Screen 1st So

25、und IF Cathode 2nd Sound IF Grid 2nd Sound IF Plate 2nd Sound IF Screen 2nd Sound IF Cathode Diode Load Cap. Diode Load Cap. Variable Trimmer Diode Load Cap. De-emphasis Audio Coupling Tone Comp. Tone Comp. Audio Coupling Tone Comp. Tone Comp. Audio Coupling Audio Output Plate t Sync. Sep. Cathode S

26、ync. Sep. Cathode Vert. Sync. Coupling Vert. Feedback Vert. Sync. Amp. Plate Vert. Sync. Coupling Vert. Integrator Net. Vert. Integrator Net. Vert. Osc. Grid Cap. Vert. Discharge Vert. Sweep Coupling Vert. Output Plate Vert. Output Plate Fixed Trimmer Fixed Trimmer Vert. Sweep Coupling Integrator Ne

27、t. Horiz. Sync- Coupling Horiz. Sync. Coupling Horiz. Sync. Coupling Horiz. Sync. Amp. Cathode AFC Filter AFC Filter AFC Filter AFC Plate Horiz. Feedback Horiz. Osc. Grid Cap. Fixed Trimmer Horiz. Discharge Horiz. Sweep Coupling Horiz. Output Screen Horiz. Output Cathode Fixed Trimmer Damper Filter

28、f Damper Filter Damper Filter Fixed Padder Damper Fil. HV Filter Accelerating Anode Dec. Voltage Divider Line Filter Line Filter Horiz. Output Fil. * Vert. Sync. Feedback * Not used in all models. t Some models use 0033MFD t tSome models use 082 MFD ii i this application (Part No. 73795). this appli

29、cation (Part No. 76683). CONTROLS ITEM No. Rl R2A B R3A B C R4A B R5A B R6A R7A B R8 RATING RESIST- ANCE l.SMeg I5KB 200K IMeg 50KB Shaft end 500KB Shaft 1500B Shaft 2.5Meg Shaft 10KB Shaft 500B WATTS i i 2 2 i -, Y i i T. J i j 2 REPLACEMENT DATA RCA PART No. 76171 76445 76444 / 76443 76447 t 76449

30、 J 76448 J7 / I 76496 IRC PART No. Concentrikit Bll-137 Bll-123 * E-187 * 511-123 Not Req. Qll-119 Not Req. Q19-139X Not Req. Qll-116 Not Req. W-500 CLAROSTAT PART No. AM-44-S FKS-1/4 AM-32-S FKS-1/4 AG-84-S FKS-1/4 AG-27-S FKS-1/4 43-500 CENTRALAB PART No. SBB-588 AN- 31 AK-1 AN-22 AK-1 B-83 AK-1 B

31、-14 Not Req. VK-127 INSTALLATION NOTES Volume Control BTS-10F BTS-221 BTS-681 BTS-561 BTS-180 BTS-391 BTA-681 BTS-82( BTB-IOI BTS-100 BTS-39 1 3/4A-1 BTS-68C BTA-561 BTA-101 BTS-150 BTS-470 BTS-100 BTS-150 BTA-100 BTS-470 BTS-82 BTS-100 BTS-100 BTS-47I- BTS-331- BTS-lOOi BTS-56F BTS-39B BTS-1201 BTS

32、-1001 BTS-680 BTS-680 BTS-18K BTS-22K BTS-27K BTS-10M BTS-330 BTS-470 BTS-100 BTA-330 BTA-470 BTS-150 BTS-100 BTS-33* BTS-220 BTS-120 BTS-lMi BTA-12I- BTS-3.9 BTS-820 BTS-18K BTS-150 BTS-8. 2 BTS-680 BTS-470 BTS-470 BTS-1.5 BTS-220 BTS-22K BTS-22K BTS-22K BTS-820 BTS-lMt BTS-lMc BTS-10M BTS-820 BTS-

33、10K BTS-3.3 BTA-100 BTS-560 PAGE 14 RadioFans.CN PARTS LIST AND DESCRIPTIONS (Continued) RESISTORS SPRAGUE PART No. 6TM-S47 5TCU-Q47 5TCU-Q15 4TM-P22 5HK-S1 5HK-S1 1FM-31 5HK-S1 4TM-P1 6TM-D47 5HK-S1 5HK-S1 5HK-S1 5HK-S1 5HK-S1 5HK-S1 5HK-S1 1FM-35 1FM-35 1FM-335 6TM-D22 6TM-D47 6TM-S15 4TM-S1 6TM-D

34、3 5GA-T27 4TM-S1 6TM-D47 4TM-S22 4TM-S1 6TM-D1 6TM-D1 5GA-T1 4TM-S1 6TM-D22 6TM-D47 6TM-S1 6TM-S47 6TM-P25 MB-D22 4TM-S22 4TM-S22 6TM-P1 4TM-P1 6TM-S22 6TM-D1 5GA-T1 5GA-T15 2TM-P47 4TM-S22 4TM-S47 6TM-S47 MS-33 6TM-S1 6TM-D15 6TM-S47 2TM-P47 2TM-P47 4TM-S1 MS-33 4TM-S47 4TM-S47 5HK-D15 5GA-T15 IDEN

35、TIFICATION CODES AND INSTALLATION NOTES Video Amp. Cathode Contrast Cont. Shunt Contrast Cont. Shunt Contrast Cont. Shunt Video Coupling AGC Filter AGC Filter Voltage Divider Horiz. Feedback AGC Cathode AGC Filter AGC Filler Sound IF Grid Filter 1st Sound IF plate 1st Sound IF Screen 1st Sound IF Ca

36、thode 2nd Sound IF Grid 2nd Sound IF Plate 2nd Sound IF Screen 2nd Sound IF Cathode Diode Load Cap. Diode Load Cap. Variable Trimmer Diode Load Cap. De-emphasis Audio Coupling Tone Comp. Tone Comp. Audio Coupling Tone Comp. Tone Comp. Audio Coupling Audio Output Plate t Sync. Sep. Cathode Sync. Sep.

37、 Cathode Vert. Sync. Coupling Vert. Feedback Vert. Sync. Amp. Plate Vert. Sync. Coupling Vert. Integrator Net. Vert. Integrator Net. Vert. Osc. Grid Cap. Vert. Discharge Vert. Sweep Coupling Vert. Output Plate Vert. Output Plate Fixed Trimmer Fixed Trimmer Vert. Sweep Coupling Integrator Net. Horiz.

38、 Sync. Coupling Horiz. Sync. Coupling Horiz. Sync. Coupling Horiz. Sync. Amp. Cathode AFC Filter AFC Filter AFC Filter AFC Plate Horiz. Feedback Horiz. Osc. Grid Cap. Fixed Trimmer Horiz. Discharge Horiz. Sweep Coupling Horiz. Output Screen Horiz. Output Cathode Fixed Trimmer Damper Filter f Damper

39、Filter Damper Filter Fixed Padder Damper Fil. HV Filter Accelerating Anode Dec. Voltage Divider Line Filter Line Filter Horiz. Output Fil. * Vert. Sync. Feedback * NSTALLATION NOTES ne Control z 1 f T i 9l 2 I 1 1 3 2 1 i t i 1 1 i 1 2 T i 2 I f Z 1 1 REPLACEMENT DATA RCA PART No. 31417 503310 50242

40、2 504110 504110 503210 503268 502110 503333 503210 503210 502056 503333 503210 503410 503356 503310 503415 503347 503412 503582 34763 503310 503222 14659 30650 503118 503339 513268 503282 523310 503210 30694 502043 76642 503168 513256 513310 503415 503447 503210 504415 513410 504447 13961 504210 504

41、210 503347 34763 503333 504210 503356 30732 503339 30731 34766 4659 4659 503318 503322 503327 04610 J03433 04447 03110 6465 6467 503415 503410 503333 503422 503212 504510 513312 503539 503182 503318 503415 503582 503468 503447 503447 503515 503422 503322 503322 503322 503282 504510 502510 503610 503

42、482 503310 502533 J13210 503156 IRC PART No. BTA-3.3Meg5% BTS-10K ETS-220K 5% BTS-100 BTS-100 BTS-1000 BTS-6800 BTS-100 5% BTS-33K BTS-1000 BTS-1000 BTS-33K BTS-1000 DTS-100K BTS-56K BTS-10K BTS-150K BTS-47K BTS-120K BTS-8.2Meg BTS-10K BTS-2200 BTS-6800 5% BTS-56K 5% BTS-180 BTS-39K BTA-6800 BTS-820

43、0 BTB-10K BTS-1000 BTS-3900 5% 1 3/4A-7000 BTS-680 BTA-5600 BTA-10K BTS-150K BTS-470K BTS-1000 BTS-150K BTA-100K BTS-470K BTS-82 5% BTS-1000 BTS-1000 BTS-47K BTS-33K BTS-1000 BTS-56K BTS-39K BTS-1200 5% BTS-1000 5% BTS-6800 5% BTS-6800 5% BTS-18K BTS-22K BTS-27K BTS-lOMeg BTS-330K BTS-470K BTS-100 B

44、TA-330 BTA-470 BTS-150K BTS-100K BTS-33K BTS-220K BTS-1200 BTS-lMeg BTA-12K BTS-3.9Meg BTS-820 BTS-18K BTS-150K BTS-8.2Meg BTS-680K BTS-470K BTS-470K BTS-1.5 Meg BTS-220K BTS-22K BTS-22K BTS-22K BTS-8200 BTS-lMeg BTS-lMeg 5% BTS-lOMeg BTS-820K BTS-10K BTS-3.3Meg 5% BTA-1000 BTS-560 IDENTIFICATION CO

45、DES ALL RESISTORS - 10% UNLESS OTHERWISE SPECIFIED Antenna Coil Shunt AGC Network AGC Network RF Amplifier Cathode RF Amplifier Cathode RF Amplifier Grid RF Amplifier Decoupling RF Amplifier Decoupling Isolation Mixer Grid RF Coil Shunt Oscillator Grid Oscillator Plate AGC Network AGC Network AGC Ne

46、twork Decoupling Decoupling AGC Network IF Coil Shunt 1st. Video IF Cathode 1st. Video IF Screen 1st. video IF Plate 2nd. Video IF Grid 2nd. Video IF Cathode 2nd. Video IF Screen 2nd. Video IF Plate Decoupling Isolation AGC Network AGC Network AGC Network Voltage Divider Voltage Divider Voltage Divi

47、der 3rd . Video IF Cathode 3rd. Video IF Screen 3rd. Video IE- Plate Decoupling IF Coil Shunt IF Coil Shunt 4th. Video IF Cathode 4th. Video IF Screen - See Note 1 4th. Video IF Plate Decoupling Voltage Divider - See Note 2 Voltage Divider Isolation Video Amplifier Grid Video Amplifier Cathode Video

48、 Amplifier Plate Wire-Wound Contrast Network Contrast Network Voltage Divider Voltage Divider Picture Tube Cathode Picture Tube Cathode See Note 2 Voltage Divider Voltage Divider 1st. Sound IF Grid 1st. Sound IF Cathode 1st. Sound IF Screen 1st. Sound IF Decoupling 2nd. Sound IF Grid 2nd. Sound IF C

49、athode 2nd. Sound IF Screen 2nd. Sound IF Decoupling Bleeder Balancing De-emphasis Balancing Balancing Ratio Detector Diode Load Ratio Detector Diode Load Tone Compensation Tone Compensation. Tone Compensation Audio Amplifier Grid Audio Amplifier Plate Audio Output Grid Audio Output Cathode Audio Cntput Cathode Wire-Wound Audio Output Decoupling Wire-Wound AGC Amplifier Grid Voltage Divider Voltage Divider Horizontal Sync.Seperator Cathode Horizontal Sync. Scperato Plate Horizontal Sync. Amplifie Grid Horizontal Sync. Amplifie Plate Horizontal Sync. Amplif