RCA-Victor-Co-Inc-RHC-37L 电路原理图.pdf

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1、VOLUME R-26, MOST-OFTEN-NEEDED 1966 RADIO SERVICING INFORMATION RCA VICTOR Models RHC-29W, RHC-33W, RHC-37L, RHC-41W, RHC-45F, RHC-49S Chassis RC-1220A Data on these sets presented below and on the next three pages. Alignment is on the next page at right. Circuit diagram and other service material a

2、re on the two pages following. TO TO TO VOL. SMI St-5 St-4 CONT srN. Xvio IredIgrn JUMPER. R2t3 Cj R404 Q20S R4Q9 C.407 I HEAT Sink C4- ysiNK o|.c;r40i ( 0411 *T CR4Q2 INTERLOCK TO Chassis LayoutComponent View ClOl. D1 C126. . B3 C228. D7 CR401 . E9 C101A. . . D1 C229. B8 CR402 E9 C101B D2 C201. E4

3、C231. B8 C101C. . . D2 C202. E5 C232. CB L101. D1 C101D . . D3 C203. D4 C233. B7 L102. Cl C101E D4 C204. C5 C234. C6 L103. C2 C101F D4 C206. . E5 C235. . B4 LI04 . C2 C102. Cl C208. . B3 C236. C5 C103. Cl C209. . B3 C237. C6 Cl 04. . A1 C210. . A2 C238 C6 C6 C106. . Cl C211. . A4 C401. A8 L203 . C7

4、C107. Cl C212. . . B4 C108. . . C2 C213. . B5 Q101. . . Cl C109. .Cl C214. . B4 L4Uo. . C404 . . D8 Q102. . . B2 cm. . C2 C215. B4 C405. . AB Q201. . . E5 Cl 12. . . C3 C216. .A5 C406. . D6 Q202. . . D5 Cl 13. . C2 C217. . B5 C407-. . D9 Q203. . A3 Cl 14. B1 C218. . B5 C408. . C9 Q204. A5 Cl 16. . B

5、2 C219. . A6 C409 . D9 Q205. . . A6 Cl 17. B2 C220. . A3 . E9 Cl 18. . C2 C221. A6 Q401. A9 Cl 19. . C2 C222. . B6 Q402. B9 C121. . B2 C223. . B7 Q403. . DB C122. B2 C224. . . B7 CR201 . . B6 Q404. D9 C123. B3 C226. .C7 CR202 BB C124. . B3 C227. . B7 CR203. . B7 R101. . . B1 R102. . B1 R103. . Cl R1

6、04. . . B1 R106. . C2 R107. . B2 R108. . . B2 R109 A1 Rill B1 R112. A2 R113. A2 R114 A2 R115 . . D2 R201. . . E4 R202. E4 R203 . E5 R204 . D5 R205. . . D5 R206 C5 R207. . C5 R208 D6 R209. . . A4 R210. . E6 R211. . B4 R212. . . B3 R213. .A3 R214 . .B3 R216. . B4 R217 . . B4 R21B B5 R219. B5 R221 A5 R

7、222 . . B5 R223 . A5 R224 B6 R226 . . B6 R227 . . . A7 R228 B7 R229. . . CB R231 . C7 R232. . C7 R234 A8 R236. . BB R237. BB R238. . B8 R239 C6 R241. . C6 R243. C6 R401 . A9 R402. . . . A9 R403. . . . A9 R404 . A9 R405. A8 R406. B9 R407 . B9 R408. . . .C9 R409 D7 R411. . C8 R412. . . D8 R413 D9 R414

8、. C9 R416 D9 R417. D9 R418 . . C9 R419 . E7 T101. El T102. B2 T201. D5 T202. C4 T203 . C3 T205 . B6 T206. B6 T207. A7 T401. . C8 124 收音机爱 好者资料库 RadioFans.CN VOLUME R-26, MOST-OFTEN-NEEDED 1966 RADIO SERVICING INFORMATION RCA Victor Chassis RC-1220A, Continued AM-FM ALIGNMENT PROCEDURE INSTRUMENTS RE

9、QUIRED Signal Sources 1. RF Signal Generator (RCA WR-50A or equivalent) 2. TV/FM Sweep Generator (RCA WR-69A or equivalent) 3. Marker Generator (RCAWR-99A or equivalent) Output Indicators 4. Vacuum-Tube Voltmeter (RCA WV-98B or equivalent) 5. Oscilloscope (RCA WO-91A or equivalent) 6. Hex head align

10、ment tool 7. Thin fibre shaft alignment tool GENERAL ALIGNMENT CONDITIONS 1. Connect low side of signal source and output indicator to chassis ground as close as possible to high side connection un less otherwise specified. 2. Signal input must be kept as low as possible to avoid AVC action. (Set ou

11、tput indicator to highest sensitivity.) 3. Markers must be accurate. (Crystal controlled or checked against a crystal calibrator.) The 10.7 me marker used in each section of the FM alignment must be the same. (Generator dial should not be moved.) 4. Marker insertion and amplitude must not distort th

12、e oscillo scope trace. 3. Standard modulation is 400 cycle at 30% amplitude. RF Generator Q202 Bast through a O.OIgf capacitor RF Generator A standard radiating loop or short piece of wire placed near AM antenna Set Signal to 455 kc (moduloted) 1620 kc (modulated) 1400 kc (modulated) 600 kc (modulat

13、ed) Set Radio Output Indicator Dial to Connected to Set Radio Function Switch on “AM Adlust for Quiet point on band gang fully open V.T.V.M. Across speoker voice coil 600 kc (rack gang) T206 (3rd AM IF) T204 Tap (2nd AM IF) T203 Top & Bottom (1st AM IF) C101F-T (Oscillator Trim) C10ID-T (Antenna Tri

14、m) C10IE-T (RF Trimmer) T201 (RF Trans.) T202 (Oscillator Call) Repeal steps 2 through 4 and steps 5 through 9 as necessary to obtain maximum sensitivity on stations Set Radio Function Switch an “FM RF Generolor Q205 Bose through a 0.01 Aif capacitor 10.7 me (unmodulated) Quiet point an band V.T.V.M

15、, Across R232_ V.T.V.M. (Set to center zero) Junction of C231, R236, R237 T207 Bottom care (Pri.) (Ratio Detector) T207 Tap core (Sec.) (Ratio Detector) Zero Voltage (crass-over) Repeal steps 12 and 13 as necessary to obtain a balanced “S” curve with 200 kc linearity TV/FM Sweep Gen. Q204 Bose throu

16、gh a 0.01 Aif capacitor TV/FM Sweep Gen. Q203 Bose through a 0.01 jiif capacitor TV/FM Sweep Gen. One FM antenna terminal Marker Generator across FM anlenna terminals through a matching network if necessary 240 kc Sweep centered at 10.7 me with markers at 10.6, 10.7 & 10.8 me Quiet point an band Osc

17、illoscope with signal Tracing Prabe (RCA WG-302A) Q205 Base (adjust signal input to obtain a 30 mv P-P reading an oscilloscope) Detune T204 Bottom T205 Top & Bottom (3rd FM IF) Detune T102 Top T204 Bottom (2nd FM IF) T102 Top & Bottom (1st FM IF-in tuner) Repeal steps 15 thru 19 as necessary la obta

18、in specified response Cl 18 (Oscillator Trimmer) Across speaker voice coil Cl 01B-T (RF-Trimmer) CI01A-T (Antenna Trimmer) Repeal steps 21, 22 and 23 as necessary la obtain, maximum sensitivity on stations * When detuning T204 & T102, the specified care should be adjusted until no action appears in

19、Ihe trace with further adjust ment af Ihe core (2 or more turns). Opposite core will have little or no effect after specified care is fully detuned. I Maximum symmeterical response centered at 10.7 me with 10.6 and 10.8 me at equal heights within 10% and approx. 40% dawn slope (limits-between 30%-60

20、%) 125 收音机爱 好者资料库 RadioFans.CN VOLUME R-26, MOST-OFTEN-NEEDED 1966 RADIO SERVICING INFORMATION RCA Victor Chassis RC-1220A (Continued) SYMBOL NO. STOCK NO. DESCRIPTION CAPACITORS: Cl 18 115092 trimmer1-8 pf for C101C Cl 19 115658 ceramic 12 pf, 5%, 500 v C121 115660 mica 220 pf, 5%, 100 v Cl 22 1156

21、56 ceramic6 pf, 10%, 500 v Cl 23 115091 ceramic0.01 pf, 20%, 100 v Cl 24 115661 mica150 pf, 5%, lOOv Cl 26 ceramic1500 pf, 10%. 500 v C201 ceramic0.047 pf. +10020%, 100 v C202 ceramic0.047 pf. +10020%, 100 v C203 ceramic3300 pf, 20%, 100 v C204 ceramic0.01 pf. 20%. 100 v C206 ceramic0.047 pf, +10020

22、%, 100 v C208 ceramic0.01 pf, 20%, 100 v C209 ceramic0.047 pf, +10020%, 100 v C210 ceramic-0.047 pf, +100-20%, 100 v C211 ceramic0.047 pf. +10020%, 100 v C212 ceramic0.047 pf, +10020%, 100 v C213 ceramic 1000 pf, 10%, 500 v C214 ceramic0.033 pf, 20%, 100 v 105310 112969 115666 111370 115100 115100 1

23、15180 115803 115617 ceramic2200 pf, 10%, 500 v ceramic0.047 pf, +10020%, 100 v ceramic390 pf, 10%, 500 v ceramic0.1 pf, 20%, 50 v headed lead 1 pf, 5%, 500 v ceramic-0.047 /, +100-20%, 100 v ceramic680 pf, 10%, 500 v ceramic680 pf, 10%, 500 v ceramic-0.01 pf, +100-20%, 100 v ceramic0.047 pf, +10020%

24、, 100 v ceramic330 pf 10%, 500 v ceramic330 pf, 10%, 500 v electrolytic2 pf, +25010%, 50 v ceramic330 pf, 10%, 500 v ceramic0.022 pf, 20%, 100 v ceramic-0.047 pf, +10020%, 100 v ceramic2200 pf, 20%, 100 v electrolytic-10 pf, +100-10%, 10 v ceramic-0.047 pf, +100-20%, 100 v electrolytic10 pf, +10010%

25、, 10 v mylar0.1 pf, 20%, 100 v ceramic3300 pf, 20%, 100 v electrolytic 1.2 pf, 20%, 15 v electrolytic100 pf, +10010%, 15 v electrolytic100 pf, +25010%, 6v 126 收音机爱 好者资料库 RadioFans.CN VOLUME R-26, MOST-OFTEN-NEEDED 1966 RADIO SERVICING INFORMATION RCA Victor Chassis RC-1220A Schematic Diagram, Contin

26、ued Q40f 2N2614 PRE-AMP 0402 2N2614 DRIVER Q403 GC4144 R416 100M* r413 I _ 0404 6bo GC4I44 R4I1 i OUTPUT 390 /O _I -Q.2V ( R45 R417 1000? 3.3 1 notes: UNLESS OTHERWISE SPECIFIED 1. ALL CAPACITOR VALUES LESS THAN 1.0 ARE plf VALUES 1.0 a ABOVE ARE Pf. 2. ALL RESISTORS 1/2 W a VALUES ARE IN OHMS. K*10

27、00 3. ALL CONNECTORS SHOWN FROM WIREO SlOE. 4. CONNECTOR PIN NUMBERS FOR REF. ONLY. 5. ALL SECTIONS OF SWITCH SI ARE VIEWED FROM FRONT, WITH SWITCH IN EXTREME CCW. POSITION. 6. VOLTAGES MEASUREO WITH“VOLTOHMYST a SHOULD HOLD WITHIN 20% AT RATEO LINE VOLTAGE. MEASUREO TO CHASSIS GROUNO NO SIGNAL APPLIED. Dial Cord Arrangement 127