RCA-Victor-Co-Inc-29K 电路原理图.pdf

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1、MANUAL OF 1942 MOST POPULAR SERVICE DIAGRAMS ftiiiiiiii r+ * o S I .r- g S3 r 4 Is i ga.Np l AyrrcMf CI 3 :;:i;s -;- Si- n SAjsfaJo oc 5 t .(i,io 5 $# So vSs0sr,4-8 ; W Cl OTvSS =$= PS ,0 Zr t75m O t530.j,) u 2:1 O u- D 10 F n 5 2 * O =. .:.:.- a j?8 ! #i9v9v9sP rCo-1 AW-wwHl iso iXjjjte L 5 $2 ? Ot

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3、R -VOLUME RADIO -PHONO CONTROL TONE CONTROL and Mechanical Specifications CABINET DIMENSIONS Height 992 inches Width 29 inches Depth 16 inches Weight (shipping) 29K 67 pounds Weight (net) 29K 54 pounds Weight (shipping) 29K2 74 pounds Weight (net) 29K2.,. 57 pounds Chassis Base Dimensions (inches).

4、Height 2, Width 16, Depth 7 Overall Chassis Height 6 inches Tuning Drive Ratio 15 to 1 TUNING RANGE CONTROL CONTROL enel LOUDSPEAKERS (RL 70J-1) (RL 81E-8) Models. 29K and 29K2 29K2 Type 12 -inch electrodynamic . 5 -inch Perm. Magnet V.C. Impedance 2.2 ohms at 400 cycles . 3 ohms at 400 cycles POWER

5、 SUPPLY RATINGS Rating A 105-125 volts, 50-60 cycles, 100 watts Rating B 105-125 volts, 25-60 cycles, 100 watts Phasing Speakers in 29K2 For correct tone, it is ESSENTIAL that the two speakers operate in phase, so that the two cones move in and out together. It is necessary to check the phasing when

6、ever a new speaker, cone, field coil, or output transformer is installed, or whenever the speaker connections are altered in any way. The recommended procedure is as follows: 1. Hook up a phase checker, using headphones or PM speaker units as shown. Connect the checker to an audio amplifier that has

7、 an output meter. (The audio channel in the Chanalyst is excellent for this purpose.) 2. Feed 400 -cycle modulated signal into the receiver. Turn volume up to medium. Hold both units of the checker in front of the large speaker in set. Throw the toggle switch to each position and note which position

8、 gives maximum output on meter. Mark this position of the switch in phase. Mark the other position out of phase. 8. Place one unit of the phase checker in front of each speaker in the set. Throw the toggle switch to each position and leave it at the position that gives greatest output on the meter.

9、Note the switch marking for this position. If it says in phase, the set speakers are correctly phased. If it says out of phase, reverse the leads to the voice -coil terminals of the small speaker in the receiver. PHONO,IELZY., P.M ALL LOWS. LEAST 5(555 01iiiixlo 11f1: ,1MAGl MO A110 x-nKxr0101110 CU

10、LL TONE -ALL 51055 AND AL. LOwi SiltOb1L 05 5100 50A P ALL HIQNS.LEAST LOWS 11.001110 OAf/ 00000C( External Antenna.-When using an External Antenna, Peak C3 for rnax. output on a station in the 91 -meter band. SHOWN WITH GANG qT MAX. CAPACITY 2 TURNS- 2- OPIO SPEAKERS STK * 37807 D.P. D.T. TOGGLE SW

11、. BP10 OUTPUT TRANSFORMER STK.06780G Tb INPUT OF AN AUDIO AMPLIFIER , OR TO AUDIO CHANNEL OF CHANALYST. OR TO 200 MICROAMP. A.C. METE R Phase Checker, using small PM speakers. RCA VICTOR DIVISION OF RADIO CORPORATION OF AMERICA, CAMDEN N. J., U. S. A. 收音机爱 好者资料库 RadioFans.CN PAGE 435-C 29K, 29K2 -(

12、Z in ma C3Q a N N 0 4 v S H rif) m0 Tu o -II- 01% z ,000 Fi - 0001 52F .; r J .9 i- gluno uqT d I. Co0 NO CO E 0 I Uo CC r y IA II mn m U. A 96 iF o 4)0 Ntll U HI, A 04.1E I c .g N h06 T O 1() S S O 0-0 Ce NN gr 0 (_,O 14 ma) i UN d 4 (r)0l1 p U- J La O o o np 4 ,U-F J r . J 0 F N 1111111 9 d 4 v am

13、 U d - d m1 I M /0 1,1 a J 1 1 U? HI II 1-*, r-3 jj N 1pf Jyi gi 4 I7 JN O t 2 t-po 收音机爱 好者资料库 RadioFans.CN PAGE 436-C 29X, 29K2 Cathode -Ray Alignment is the preferable method. Connections for the oscillograph are shown in the schematic drawing. Output Meter Alignment.-If this method is used, conne

14、ct the meter across the voice coil, and turn the receiver volume control to maximum. Test-Oscillator.-For all alignment operations, connect the low side of the test -oscillator to the receiver chassis, and keep the output as low as possible to avoid a -v -c action. Calibration Scale on Indicator -Dr

15、ive -Cord Drum.-The tuning dial is fastened in the cabinet and cannot be used for reference during alignment, therefore a calibration scale is attached to the indicator - drive -cord drum which is mounted on the shaft of the gang condenser. The setting of the gang condenser is read on this scale, wh

16、ich is calibrated in degrees. The correct setting of the gang in degrees, for each alignment frequency, is given in the alignment table. As the first step in R.F. alignment, check the position of the drum. The 135 mark on the drum scale must be vertical, and directly over the center of the gang -con

17、denser shaft when the plates are in minimum capacity position. The drum is held to the shaft by means of plastic cement which must be securely fastened when the drum is in the correct position. To determine the corresponding frequency for any setting of the calibration scales, refer to the accompany

18、ing drawing which shows the dial with 0-180 calibration scales drawn at top and bottom. Pointer for Calibration Scale.-Improvise a pointer for the cali- bration scale by fastening a piece of wire to the gang -condenser frame, and bend the wire so that it points to the 0 mark on the calibration scale

19、 when the plates are fully meshed. Dial -Indicator Adjustment. - After fastening the chassis in the cabinet, attach the dial indicator to the drive cable with indicator at the 540 kc mark, and gang condenser fully meshed. The indicator has a spring clip for attachment to the cable. Precautionary Lea

20、o Dress. - 1. Dress all filament wiring away from audio and output tube grids. 2. The 226 mmfd. (C15) should be dressed away from all parts and wiring. 3. Leads from 2nd I.F. to tone switch should be dressed under the trimmer bank. 4. Speaker leads should be dressed close to chassis base and away fr

21、om the phono plug. 5. Primary transformer lead should be twisted around A.C. lead to switch and dressed over top of transformer. 6. Dress C7 (150 mmfd. cap.) from range switch to R.F. socket away from all leads and metal parts. OTIIFOWISE SAME AS 29K EXCEPT C 25 - 470 MEW. C 25 - .OIS MFE). C33. . 0

22、1 MI -0 MIMI FREE). SPEAKER Model 29K2 Speaker Connections 29K2 (RC -570-D) With 5 -inch EM Speaker: In 2nd production, the 5 -inch speaker is changed from PM to EM, as listed below: SPEAKER ASSEMBLIES (R L-86 B-5 ) Stock No. Description :39543 Coil-Field coil -450 ohms :39567 Cone-Cone complete wit

23、h voice coil :30870 Plug -2 -prong male plug for speaker 5118 Plug -3 -prong male plug for speaker 29K2 Alignment Procedure Steps Connect the high side of test-osc. to- Tune test-osc. a to-S Ran a Rangie Trn radio u udirn to- Adjust the following for max. peak output 8SK7 I -F grid in series with .0

24、1 mfd. 455 kc A Quiet Point near 180 L17 and L18 (2nd I -F Trans.) 2 6S7 Dtt. grid in series with .01 mfd. L-15 and L-16 (1st I -F Trans.) S Ant. section of Gang Condenser 1,500 kc A 160 C-12 (osc.) 4 600 kc 30.5 L-7 (osc.) 5 Ant. terminal AC-4 in series with 47 mmf. link open 6,100 kc B 161 C-11 (o

25、sc.). C -b_ (ant.) 6 16,200 kc C 167 C-10 (osc.) (ant.) 7 9,500 kc S2o C-9 (ant.) (Rock Gang) 8 Repeat steps 6 and 7. 9 Fasten chassis in cabinet, see that link- is closed on antenna terminal board, indicator at left end of dial scales with gang at maximum capacity. 10 A radiation loop consisting of

26、 two turns of 18 inches in diameter located 4 to 6 feet from receiver 1,500 kc A 1,500 kc signal C-1 (ant.) on loop 11 800 kc 600 kc L-7 (O6C) (Rock Gang) 12 Repeat steps 10 and 11. Use minimum capacity peak if two peaks can be obtained. Note: Oscillator tracks above signal on all bands. L I5 -DOTTO

27、 M LIE.- Top 455 KC. 2ND.I.F. LIT- BOT TTO M LID - TOP 4.55 KC. m m / K. o KC. 29K -K2 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 POLICE 23 2.5 .IRU.ET 90M .MAIEUR 60M MOW? 49M , . . . 3.0 . 3.5 . . . , ., .a. . 55 60 70 80 100 120 140 160 . . , . . R.R.,.R . .e,.R,.,.V.J.,.,R1

28、u.Juu.u., , JI METERSS METERS AMATEUR 19 MF1FR5 9.3?. = = t0 I I 2: 13 14 15i . . . . . . . . . . , . 1 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 PAGE 437-C 29K , 29K2 Adjustment for Electric Tuning This model has six push buttons for electric tuning The buttons connect to sep

29、arate magnetite -core oscillator coils and separate an- tenna trimmers which must be adjusted for the desired stations. Use an insulated screwdriver or alignment tool such as RCA Stock No. 31031. Allow at least five minutes warm-up period before making adjustments. The procedure is as follows: 1. Ma

30、ke a list of the six desired stations, arranged in order from low to high frequencies. 2. Turn Range Control knob to A position, and manually tune in the first station on the list. Seo To I600 KC i i 740 TO 1430 I 610 TO 1260 I 640 TO KC 1 KG ,1030KC TRIMMER SCREWS eII S 4 I 3 I 2 I CORE 1 ROOS 0 0

31、I I 0 Push Button Adjustments Turn the Loop Antenna to give minimum pickup of signal, no outside antenna should be used and link on antenna board should be closed. 3. Turn Range Control knob to PB and press push button No. 1 and adjust No. 1 oscillator core to receive this station. Screw the core al

32、l the way in, to lowest frequency, and then unscrew slowly until station is received. 4. Adjust No. 1 antenna trimmer for maximum output on this station. Owing to the relatively high R -F gain, it may be found that there are several settings of each push-button magnetite core that will bring in any

33、particular station. In such cases it is advisable to unscrew the push button antenna trimmers to minimum capacity before adjusting the oscillator cores. Clockwise adjustment of cores and trimmers tunes the cir- cuits to lower frequencies. 5. Adjust for each of the remaining five stations in the same

34、 manner. 6. After all six stations are tuned -in on the buttons, turn the Loop Antenna to a position giving the hest signal pickup and make a final careful adjustment of all core rods until best re- ception is obtained for each. Outdoor antenna should now be reconnected if used. Replacement Parts -t

35、asted parts which are readily Identified end may be purchased hors authorized dealers. STOCK No. DESCRIPTION STOCK DESCRIPTION CHASSIS ASSEMBLIES 30992 Resistor -10 meg., 1 watt RC -670 (29K) 36589 Shaft-Tuning knob shaft RC -570C (29K2) 35772 Shield-Bottom end shield for power transformer No. 35959

36、 35966 Board-Antenna-Ground board . 35709 Shield-Top end shield for power transformer No. 38571 Capacitor-Electrolytic comprising 2 sections of 35959 10 mfd., 400 volts, and 1 section of 20 mfd., 31364 Socket-Dial lamp socket 25 volts 35787 Socket-Phono input socket 38368 Capacitor-Adjustable trimme

37、r -50-350 mmfd., 31251 Socket-Tube socket for C band antenna coil 31418 Spring-Pointer cord spring 38572 Capacitor-Mica trimmer comprising 3 sections of 5-50 mmfd., and 2 sections of 8-80 rnmfd. 12007 Spring-Retaining spring for adjustable core and stud 36424 Capacitor-Mica trimmer comprising 1 sect

38、ion of 38575 Switch-P.B. selector switch 10-160 rnmfd., 2 sections of 25-250 mmfd., 2 38577 Switch-Range switch sections of 50-400 mmfd., and 1 section of 100- 38576 Switch-Tone switch 540 mmfd. 35636 Transformer-First I.F. transformer 13057 Capacitor -68 mmfd. 35790 Transformer-Second I.F. transfor

39、mer 12720 Capacitor -100 manid., moulded 38799 Transformer-Output transformer (29K2) (T3). 34699 Capacitor -100 mmfd., unmoulded 35588 Transformer-Power transformer -105-120 volts, 34700 Capacitor -120 mmfd. 25 cycle 12726 Capacitor -150 mmfd. 35959 Transformer-Power transformer -105-120 volts, 1300

40、9 Capacitor -180 mmfd. 50/60 cycle-less end shields 98830 Capacitor -226 mmfd., silvered mica 35969 Washer-C washer for tuning shaft . 30433 Capacitor -470 mmfd. 12537 Capacitor -580 mmfd. SPEAKER ASSEMBLIES 38831 Capacitor -630 mmfd., silvered mica (RL -70J-1) 12951 Capacitor -2200 mmfd. 34506 Capa

41、citor-.0018 mfd. 13867 Cap-Dust cap 33584 Capacitor-.005 mfd. 12079 Coil-Field coil -1060 ohms 5148 Capacitor-.007 mfd. 11469 Coil-Neutralizing coil 4937 Capacitor-.01 mfd. 36145 Cone-Cone complete with voice coil 11315 Capacitor-.015 mmfd. 5039 Plug -4 prong male plug for speaker 37706 Capacitor-.0

42、25 tumid. 36146 Support-Metal cone support 32787 Capacitor-.05 mfd. 33444 Transformer-Output transformer (T2) 4839 Capacitor -0.1 mfd. 38367 Coil-Antenna coil SPEAKER ASSEMBLY 38829 Coil-Coil and resistor assembly RL -81B-6 (PM) 29K2 38358 Coil-Oscillator coil 38315 Coil-P.B. oscillator coil-high fr

43、equency 35849 Cap-Dust cap 37638 Coil-P.B. oscillator coil-low frequency 38883 Cone -Cone complete with voice coil 38570 Condenser-Two gang variable tuning condenser 5118 Plug -3 prong male plug for speaker 38404 Control-Volume control and power switch 34662 Cord-Pointer cord (approx. 78 in. overall

44、 length) MISCELLANEOUS ASSEMBLIES 35788 Core-Adjustable core and stud for oscillator coil 38375 Button-Push button 35871 Core-Adjustable core and stud for P.B. oscillator 38684 Capacitor-Mica trimmer -2-20 mmfd coils 38584 Channel-Rubber channel to hold dial in escutch- 38359 Cup-Mounting cup and bu

45、shing for oscillator eon (2 required) coil 38579 Coil-Loop primary coil 38361 Drum-Condenser drive drum 38708 . Decalcomania-Control panel decal 5119 Plug -3 contact female plug for connector cable. 38583 Dial-Glass dial scale 6040 Plug -4 -contact female plug for speaker cable. 38582 Escutcheon-Dia

46、l scale escutcheon 38832 Plug-Pin plug for loop leads, Pkg. 6 38709 Indicator-Station selector indicator 31373 Pulley-Drive cord pulley 35814 Knob-Control knob 35885 Resistor -470 ohms, 2 watts 11891 Lamp-Dial lamp 14720 Resistor -1000 ohms, watt 38578 Loop-Antenna loop complete 34767 Resistor -2200

47、 ohms, watt 34317 Marker-Station markers 14024 Resistor -2700 ohms, 1 watt 33774 Mounting-Speaker mounting hardware 38714 Resistor -15,000 ohms, watt 38580 Pivot-Loop bracket and pivot tube-located on 35595 Resistor -15,000 ohms, 3 watts top of loop frame 30409 Resistor -27,000 ohms, 1 watt 38707 Plate - Dial plate complete -1 e s is indicator 12412 Resistor -47,000 ohms, i watt pointer 30787 Resistor -47,000 ohms, watt 36422 Socket-Loop cable socket-located on loop. 30850 Resistor -56.000 ohms, watt 30900 Spring-Retaining spring for knob 30651 Resistor -270,000 ohms, 1. watt 34053 Spring