CBS-Columbia-205C-Sams-293-2电路原理图.pdf

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1、PHOTO FACT* FolderCBS-COLUMBIA MODELS 2O5C1, 2O5C2 CHANNEL SELECTOR VERT. HOLD CONTROL -i HUE /RANGE BRIGHTNESS CONTROL CHROMA CONTROL CONTRAST CONTROL ON-OFF SWITCH VOLUME CONTROL FINE TUNING HORIZ. HOLD CONTROL TONE CONTROL CBS-COLUMBIA MODEL 205C2 TRADE NAME CBS-Columbia Models 205C1, 205C2 MANUF

2、ACTURER CBS-Columbia, A Div. of Columbia Broadcasting System, Inc., 48-50 34th. St., Long Island City, N.Y. TYPE SET Color Television Receiver TUBES Forty-five POWER SUPPLY 110-120 Volts AC-60 Cycles TUNING RANGE Channels 2 thru 13 VHF, 14 thru RATING 4.9 Amp. 117 Volts AC 83 UHF, Video IF 45.75MC,

3、Sound IF 41.25MC (Intercarrier) Alignment Instructions * Block Diagram Disassembly Instructions Miscellaneous Adjustments Parts List and Descriptions Photographs Cabinet-Rear View Capacitor Identification (RF-IF Chassis) Capacitor Identification (Sweep Chassis) . Chassis-Top View (RF-IF Chassis) Cha

4、ssis-Top View (Sweep Chassis) RF Tuner 3 27 . 20, 29 21 thru 27 INDEX 6, 7 Photographs (Cont) Resistor Identification (RF-IF Chassis) R1-R151. .14, 15 19 31, 32 . 11, 18 28 28 . 10 Resistor Identification (RF-IF Chassis) R191-R293 .12, 17 Resistor Identification (Sweep Chassis) .13,13 Inductor siaao

5、w viawmco-saD RadioFans.CN RESISTANCE MEASUREMENTS Item VI V2 V3 V4 V5 V3 V7 V8 V9 V10 vu V12 VU V14 V15 V16 V17 V18 V19 V20 V21 V22 V23 V24 V25 V26 V27 V28 V29 V30 V31 V32 V33 V34 V35 V36 V37 V38 V39 V40 V41 V42 V43 V44 V45 Tube 6T4 6BZ7 6U8 6CB6 6CB6 6CB6 6CB6 6CL6 6CL6 6AN8 6AN8 6AN8 6AU6 6AU6 6A

6、L5 6AV6 6AQ5 12 AT 7 12AT7 6BL7GT 6AL5 12AU7 6CU6 6CU6 6AU4GT 6AU4GT 3A3 3A3 3A3 6BD4A 6BL7GT 6BL7GT 6BL7GT 6AN8 6CB6 6AL5 6AN8 6BY6 6BY6 6AN8 12BH7 I2BH7 12BH7 6BC7 19VP22 Pin 1 *f6ira t3. 6Kn f 3. 6Kf! 50KS2 50KSJ 27KSJ .2n ison 220n flSKn J6. 6Kn 750Kn 5. 5n 47Kn Inf. ISOKn 470KJJ T350Kn tL4Kn I.

7、 8Meg 27KSJ TISKn TP TP NC NC Inf. Pin 2 8. 2Kn 130KSJ 200KS3 62f! 62n 62n ison .20 8Kn 390Kn T28Kn 750KS2 on on Inf. 820n 330n 2. 2Meg IMeg TSMeg 27KSJ 5Meg .in on NC NC 50Meg Pin 3 .in Inf. tiixn on .in on .in ti2Kn tsson 3Kn 600 Kn on on on . w .in .in on i. 3Kn on on 2. 2Kn TP TP Inf. Inf. Inf.

8、Pin A on on .in .in on .in on .in .in . in on . in .in .in on on on .in on 3. 9Meg . 1Q .in ta. 2Kn ts. 2xn NC NC 50Meg Pin 5 on .in on t iixn TiiKn tUKn TUKn on on on .in on f L 5Kn ?L5Kn on on T2. 1K!J .in on tucn 4. 8Meg .in 550Kn 550Kn t45n t45n Inf. Pin 6 8. 2Kn Inf. tl.3Kn t47Kn tiiKn tiiKn 1

9、1. 3Kn fi. 6Kn t6Kn tiiKn 300Kn t 2. 7Kn i. 5Kn f i. 5Kn on on 1 1. 5Kn l-6Kn NC soon on t leoKn NC NC NC NC Inf. Pin 7 *t 6KO aooKn on on on on on on on tsson Tsoon t 2. 7Kn 220n on 44Kn T 220Kn 470Kn tlMeg NC .in 4. 8Meg UOKn on .in .in .in SOMeg Pin 8 isn on Ti2Kn tsson 2. 2Meg 4. 5Meg .gn 470n N

10、C on 2. 2Kn on on on on Inf. PINS 1-8 HAVE INF RESISTANCE PINS 1-8 HAVE INF RESISTANCE T4SZ lOOKn IMeg lOOKn tllKn 3n 5D T40Kn 2om 140 Jl tSKSJ t5. 2Kn T5. 2Kn t5. 2Kn tlMeg T20KS2 PIN 10 NC Inf. t!20Kn lOKf! f 3 . 2K!2 lOOMeg f!7Kn .sn 150KJJ loon lOOf! 390Kfi l.SMeg 1. 8Meg 1. 8Meg t!2Kn tlMeg PIN

11、 11 t!20Kn NC on 25Kn on on .in .in i. 5n on on 6. 2Kn 450n 4 son 450n on t!20Kn PIN 12 TlMeg NC 60Kn eoKn eoKn .in on on .in .in .in on .in .in .in on tioicn PIN 13 tioxn 2.5Meg f27Kn t27Kn t27Kn on t2.7Kn lOOMeg Of! TlSKn t8Kn .in .in .in .in .in tionn PIN 14 t20Kn NC 2. 2Kn 2. 2Kn 2. 2Kn fi. 5Kn

12、f2. 7Kn on f2. 7Kn t3.9Kn f3. 9Kn tiinn tiiKn tiiKn tiiKn ti7Kn Inf. .in .in .in Ti.sKn t!7K!2 lOOMeg tiSKn .ea . en fsson 70on 70on 3.5Kn TlMeg TlMeg i T120Kn ! NC on on on T-16KS2 lOOMeg IMeg 20on 2oon 20on Ti2Kn NC Pin 9 on WKn . 2n 8Kn 22on t sson 220n on . in on TOP CAi .95n TOP CAP SOMeg TOP C

13、AP Inf. TOP CAP Inf. f70on sson 40on on on on tlMeg SOMeg MEASURED IN UHF POSITION. f MEASURED FROM POSITIVE SIDE OF C2. T MEASURED FROM POSITIVE SIDE OF Cl. .MEASURED FROM PIN 3 OF V25. NC-NO CONNECTION. TP-TIE POINT. ALL MEASUREMENTS TAKEN IN VHF POSITION UNLESS OTHERWISE DESIGNATED. PAGE 4 RadioF

14、ans.CN TUBE PLACEMENT CHART BOTTOM VIEW CRF-IF CHASSIS) CHROMA REF. OSC. | 3.58 MC s I CRYSTAL VX L38 CHROMA REF- OSC. CONT. A5) L4 PHWEET AGC CLAMPER CHROMA SYI UHF MIXER UHF TUNER W vs) MIXER RF AMP 1ST VIDEO IF LI5 QL37 QUADRATURE AMP / HORIZ SYNC SEP -HORfZ SYNC VIDEO DET 5 TH VIDEO IF 1N60 L21

15、M6 ra 2ND VIDEO IF /* X LI80 ( C5 j 5CB6J 3RD VIDEO IF CHROMA BANDPASS AMP L35 0 (J2S JfJD 4TH VIDEO IF SOUND DETL|SM|3 XN L3J Ky Q SYNCHRONOUS DET l SYNCHRONOUS DET _ Q PHASE 1NV AFAMP l AMP X X 6AV6 ) t6AQ5j (6AN6) AUDIO OUTPUT -r- PHASE ,N. 0 N_y VIDEO AMP - COLOR KILLER L25 / T SOUND IF 2ND SOUN

16、D IF RATIO DET BLUE ADDER BLUE OUTPUT GREEN ADDER GREEN, BLUE table. Alignment of this portion is not recommended F IG.8 15. 16 17. 18. 19. 20. 21 22 23 24 25 26 27 28 Remove fuse (M4) (located on rear apron of deflection chas negative lead of a 30V bias supply to pin 2 (grid) of 6AN8 p Connect the

17、positive lead to chassis. Turn the contrast control (R2) and the chroma control (R4/ If a separate marker generator is used, couple it loosely 1 Connect the synchronized sweep voltage from the sweep ge DUMMY ANTENNA .005MFD SWEEP GENERATOR COUPLING High side to pin 2 (grid) of 6CL6 (V9) . Low side t

18、o chassis. SWEEP GENERATOR FREQUENCY SMC (SMC Swp) MARKE GENERA! FREQUES 2.2MC 2.4MC 4. IMC 4.4MC 4. SMC Connect a 500MMF mica capacitor between pin 6 (plate) of Leave bias connected as under Bandpass Amplifier Alignn Use only enough signal generator frequency for usable indi DUMMY ANTENNA .005MFD S

19、IGNAL GENERATOR COUPLING High side to pin 2 (grid) of 6CL6 (V9). Low side to chassis . SIGNAL GENERATOR FREQUENCY 3.58MC (Unmod) CHANNE Between any two channels Tune in a local black and white TV station. Adjust contrast chroma control and contrast control to their mid-range pot Turn brightness cont

20、rol for low brightness. Connect a col color bars. DUMMY ANTENNA Direct SWEEP GENERATOR COUPLING Use color bar generator. Connect across antenna terminals. Use color bar generator. Connect across antenna terminals. Set generator for Q signal. Connect color bar gener- ator across antenna ter- minals.

21、Set generator for I signal. SWEEP GENERATOR FREQUENCY Not used MARKE GENERA FREQUEh Not us Connect a 100% saturated color bar generator to antenna te: selector to receive color bars . Adjust contrast, hue rangi DUMMY ANTENNA Direct SWEEP GENERATOR COUPLING Use color bar generator Connect across ante

22、nna terminals . SWEEP GENERATOR FREQUENCY MARKI GENERA FREQUEb RadioFans.CN T INSTRUCTIONSBANDPASS AMPLIFIER ALIGNMENT F IG.3 F IG.5 IG.6 270 MMF TO RECIEVER IN64 220 r. FIG.8 15. 16 17. 18. 19. 20. 21 22 23 24 Remove fuse (M4) (located on rear apron of deflection chassis). Unless set has a color ki

23、ller switch to open color killer circuit, connect the negative lead of a 30V bias supply to pin 2 (grid) of 6AN8 (V34B). Connect the positive lead to chassis. Turn the contrast control (R2) and the chroma control (R4A) fully clockwise. If a separate marker generator is used, couple it loosely to pin

24、 2 of V9. Connect the synchronized sweep voltage from the sweep generator to horizontal input of the oscilloscope for horizontal deflection. DUMMY ANTENNA .005MFD SWEEP GENERATOR COUPLING High side to pin 2 (grid) of 6CL6 (V9). Low side to chassis. SWEEP GENERATOR FREQUENCY SMC (3MC Swp) MARKER GENE

25、RATOR FREQUENCY 2.2MC 2.4MC 4. IMC 4.4MC 4. SMC CHANNEL Between any two channels CONNECT SCOPE Vert. Amp. thru detector (Fig. 7) to pin 2 (cathode) of 6BY6 (V38). Low side to chassis. ADJUST A20, A21, A22, A23 REMARKS Adjust A20, A21, A22 and A23 for re- sponse curve similar to Fig. 8. Adjust A20 to

26、 place 4. 5MC in trap notch . A23 affects high frequency side of response curve. A21 and A22 affects bandwidth and tilt. 3.58MC TRAP ALIGNMENT Connect a 500MMF mica capacitor between pin 6 (plate) of V12B and pin 2 (grid) of V9. Leave bias connected as under Bandpass Amplifier Alignment. Turn contra

27、st control fully clockwise. Remove M4 from fuse holder. Use only enough signal generator frequency for usable Indication on VTVM. DUMMY ANTENNA .005MFD SIGNAL GENERATOR COUPLING High side to pin 2 (grid) of 6CL6 (V9). Low side to chassis . SIGNAL GENERATOR FREQUENCY 3.58MC (Unmod) CHANNEL Between I

28、any two ( channels C CONNECT VTVM C probe thru detector ig.7) to point . ommon to chassis. ADJUST A24 1 REMARKS Adjust for MINIMUM deflection. Remove bias supply Replace M4 in fuse holder. Remove 500MMF from pin of V12B and pin 2 of V9. COLOR AFC ALIGNMENT Tune in a ocal black and white TV station.

29、Adjust contrast and brightness controls for a normal picture. Then preset hue range trimmer, chroma control and contrast control to their mid-range position. Turn brightness control for low brightness. Connect a color bar generator across antenna terminals, set channel selector to receive color bars

30、 . DUMMY ANTENNA Direct SWEEP GENERATOR COUPLING Use color bar generator. Connect across antenna ter m Inals . Use color bar generator. Connect across antenna terminals. Set generator for Q signal. Connect color bar gener- ator across antenna ter- minals. Set generator for I signal. SWEEP GENERATOR

31、FREQUENCY Not used MARKER GENERATOR FREQUENCY Not used CHANNEL Between any two channels Channel of color bar gener- ator. Channel of color bar generator (Q Signal Channel of color bar gener- ator I signal CONNECT SCOPE Use VTVM. DC probe to pin 7 (plate) of 6AL5 (V36) Common to chassis. DC probe to

32、point do . Common to chassis. Vert. Amp. to point p . Low side to chassis. Vert. Amp. to point . Low side to chassis. ADJUST A25 A26 A27 A28, A29 A30 R26 Hue Range Trimmer A27 REMARKS Adjust A25 counter clockwise until reading on VTVM drops to -2.5 volts. Then adjust clockwise until reading on VTVM

33、rises sharply to -7 volts. Continue adjusting clockwise until reading passes thru maximum deflection and falls 2 volts below maximum reading on VTVM. Adjust for maximum deflection. Adjust for MINIMUM deflection. Connect a clip lead from pin 8 of V12B to chassis. Adjust A28 and A2 9 for maximum defle

34、ction. Remove short from pin 8 of V12B. Connect a clip lead from point to chassis. Adjust A30 until color bare are almost In sync. Remove short point p . Color bars should fall in sync, if not retouch A30. Connect a 10MMF capacitor across 3.58 crystal (M16). Adjust the color AFC bal- ance control (R

35、26) for zero reading on VTVM. Remove 10MMF capacitor from across M16. Switch off the I channel of the color signal generator. Switch the Q channel to on position. Adjust hue range trimmer for zero Q indication on scope. Switch off Q channel of color signal generator. Switch the I channel to on posit

36、ion. Readjust A27 for zero I indication on scope. MATRIX ADJUSTMENT 25. 26 27 28 Connect a 100% saturated color bar generator to antenna terminals or tune in a station broadcasting on NTSC color bar signal. Set channel selector to receive color bars. Adjust contrast, hue range trimmer and chroma con

37、trols to their mid-range position. DUMMY ANTENNA Direct SWEEP GENERATOR COUPLING Use color bar generator Connect across antenna terminals. SWEEP GENERATOR FREQUENCY MARKER GENERATOR FREQUENCY CHANNEL Channel of color bar gener ator CONNECT SCOPE Vert. Amp. to pin 12 (blue grid) of picture tube (V45)

38、. Low side to chassis. Vert. Amp. to pin 2 (red grid) of pic- ture tube (V45) . Low side to chassis. Vert. Amp. to pin 6 (green grid) of picture tube. Low side to chassis. ADJUST R4A R27 REMARKS Adjust the chroma control (R4A) for maximum cancellation of green and yellow bars. Adjust the I gain cont

39、rol for best cancellation of red. Repeat steps 25 and 26 for best cancellation of green, yellow and red. Check cancellation of green, blue and cyan bars. Check cancellation of red, magenta and blue bars. If necessary, repeat entire matrix adjustment until best overall can- cellation is obtained. r v

40、 F C r C o 3 c n C K C d f K C u r K PAGE 7 RadioFans.CN TUBE PLACEMENT CHART CHROMA REF OSC. A/3 CHROMA REF. OSC. CONT. (6AN8J V45 PICTURE TUBE 19VP22 OSC (eue.1- L2 MIXER RFAMP AGC KEYING HORIZ SYNC SEP TOP VIEW (RF-IF CHASSIS) BLUE ADDER GREEN ADDER RED ADDER V4) U2BH7) 4TH VIDEO IF 1ST SOUND IF

41、BLUE OUTPUT GREEN OUTPUT RED OUTPUT INDICATES BLANK PIN OR LOCATING KEY ON TUBE SOCKET 6BC7) GREEN, BLUE (C128) (CU5(C124)(C122) (Cl SWEEP CHASSIS-BOTTOM VIEW-C/ PAGE 18 RadioFans.CN EW-CAPACITOR IDENTIFICATION SET 293 FOLDER 2 PAGE 11 RadioFans.CN PAGE 12 RadioFans.CN RF-IF CHASSIS-BOTTOM VIEW-RESI

42、STOR IDENTIFICATION (RI9I -R293) IDSOS siaaow viawmoD RadioFans.CN SWEEP CHASSIS-BOTTOM VIEW-F PAGE 16 RadioFans.CN n oo u n O 03 O o 10 O Oi n KJ O Ul G VIEW-RESISTOR IDENTIFICATION SET 293 FOLDER 2 PAGE 13 RadioFans.CN PAGE 14 RadioFans.CN O RF-IF CHASSIS-BOTTOM VIEW-RESISTOR IDENTIFICATIONC RI-R1

43、51) LDSOS siaaow RadioFans.CN T10 M14 M18 T6 Ml HIGH VOLTAGE CONTROL HORIZ. SIZE HORIZ. LINEARITY CABINET-REAR VIEW FRONT PANEL SERVICE (SC CONTROLS CRF-IF CHASSIS) AGC BLUE BACKGROUND GREEN BACKGROUND BLUE GAIN -GREEN GAIN VERT HORIZ FIELD PURITY LINEARITY CENTERING NEUTRALIZING E BLUE BLUE VERT VE

44、RT HORIZ FOCUS TILT PARABOLA PARABOLA FRONT PANEL SERVICE CONTROLS (SWEEP CHASSIS I D GREEN BLUE HEIGHT VERT HORIZ HORIZ RED RED GREEN GREEN SCREEN SCREEN SCREEN CENTERING AFC DRIVE VERT VERT VERT VERT VOLTAGE VOLTAGE VOLTAGE TILT PARABOLA TILT PARABOLA GREEN HORIZ PARABOLA AR PANEL SERVICE CONTROLS

45、 (SWEEP CHASSIS) I HIGH VOLTAGE ADJUST HORIZ SIZE HORIZ LINEARITY SET 293 FOLDER 2 PAGE 19 RadioFans.CN MISCELLANEOUS ADJUSTMENTS HORIZONTAL SWEEP CIRCUIT ADJUSTMENT Turn the set on and tune In a TV station, preferably a test pattern. Set the horizontal hold control to its mid-range position and adj

46、ust the horizontal AFC slug (Bl) until the picture synchronizes horizontally. Turn the horizontal drive control (R14) as far clockwise as possible without the presence of vertical white lines or compression near the center of the picture. Adjust the width slug (B2) for a picture slightly wider than

47、necessary to fill the picture mask horizontally. Adjust the horizontal linearity slug (B3) for a picture that is symmetrical from left to right. Turn AGC adjustment control (R7) to prevent any signal overload. HIGH VOLTAGE ADJUSTMENT Turn the contrast and brightness control fully counter clockwise.

48、Connect the probe end of a high voltage probe to the high voltage anode lead (disconnect at picture tube and insert a T connector in the lead. Short out high voltage before disconnecting lead). Connect common lead of VTVM to chassis. Set meter for approximately 30KV reading on VTVM. Turn the high vo

49、ltage adjustment control (R28) (rear panel of deflection chassis) for 26KV on VTVM. Turn the brightness control clockwise and notice the variation of high voltage on VTVM. There should not be more than 500 volts variation to the point where lose of regulation occurs. Beyond this point blooming will occur. The brightness control should always be operated within the range of the voltage regulator. Disconnect power from the set, short out high voltage lead to chassis and remove VTVM. Reconnect high voltage anode lead. COLOR PURITY ADJUSTMENTS