BC-669A_B_C_D_sch_TM11-4058_1945.pdf

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2、ti.OOO OHI-IS 2!10.000 Oltlo!S 1.000 OHMS SO 011-.5 SOOH)IS so 011)1.$ - 50 OIJlS O.JSI OHM 0.351 OKH 5. 000 OKW S 5C669A ao -a. 500 0111$ IIIli! ttOO 01o4HP sc-ss9-c. 400 OIIYS 1.0,000 011)$ 10.000 Q!lot$ 125 05 1.000 QlfV$ 500 OHotS 100.000 0115 lUliNG 200 V0C11 iiOOVQCw sao voco 600 VO(W r.ooo vo

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4、, IOI I I 500 Mf =!= I - I 1 6666661 I !J 7 9 II PL.1 z .; 6 8 10 12 ? . ? i ? ? ? - _qn _j :n I II I I =o=_jl_ .Jl n v-fROT Sll -:- jPHQ,jSj IOIC(-Cwl r- -:-SWITCH t C.o.-:0:=-=0=-=-0-:0_-;:0- = -=-=-=-=-=-=; -=-=-=-=; h_ _ - -=-220M -=-r 1 7 - c,oz-+-4-, -=-SlOE TOE OSC ., . AND SFCH AMPLR J:Orl-6

5、l6G T 2,000J p v, : ,., I A!J2 lOOn P 0 I) I I I LS, I I I ., Z!JOlot -A.A. A son . , s 0 lSIJl . 8; =r I I I . ,o -;-I,OOOn I ;M _f,CrtMf, )-. 9F I :r. s, 7 !TR.:OI.SMITT(I:t 1W!TC I Rb6 EOU.O.LS 400-.Jl. IN BC -669-C. M I,OOO .!l I :;: t S SYWSOl FOR Fl.tEO CAPACITOR POSITION 1 - J.,OO.PL.t.r C.UA

6、R(NT POSITION l -PA PLt.Tt! CURRENT POSITION- CURPE! F-igure 6. Rad-io Receiver and T1-a11smitters BC-669-A, -B, a11d -C, 111oduJator sectio11, u.rith modificatioH for c-. operatio11. . PL2 TO 00NE.=? SJ PPLY L: T PE-nr-:J v., 7( V15 Vt:; V14 V1 2 2 2 4.000 - -:._-_-_-_-.=-=:_-=-=-=-=50 II I 1 12 II

7、 a t so, SITCH I -r-r :1 I TRANSMITTER J rf-J . POWER l9lo- S14 4 rr:-= - I II , 1 0 St4.8 r=- 191 :-;,0-VL:-Ell 0 b -1 ,R59 50!1-. PeG F I OMEG 0.02M . 19lC-240 M -:-:- - R1o N I _. j c72 GQfIF G 0.53081l R61 V1 50!1 v 1 R64 2! o.530enl !z -._ _:_ _ .:_ 3 55.1 55 2 + - 2 DIRECT CURRENTl Figure 7. R

8、adio R eccive r a11l Tra11smitter BC-fJ69-D, modulator sectiou, schematic. f METER 551 55 2 POSI TION I CURRENT POSITION 2 lPA GRID l CURRENT POSITION 3-lMOD PLATE CJRRENT TL 167648 . 0 ANT. RYI R2 15M VOLTAGES IN ( ) ARE FOR VI BRA PACK . OPERATION. 32lV D-C 330 11. 12.6VA-C (12V D-C) OPEN 26D (220

9、lV D-C 30.5 M I MEG 312)VD-C 33011. 951B5lV D-C 20.5 M 6.3V A-C !6V D-C) OPEN VI JAN-6SK7 (VT-117) R-F AMP CDc6 I TO Rl3 TO R9 MIXER STAGE 1-F AMP STAGE BC-669-B C7 TO Rl3 TO R9 CIO I ;1 1 _ 1 Gil I 6-25 MMF I I I _ J 042 0.0015 MF BG-669-C TO Rl3 TO V2 GRID TO SWITCH Sl.4 MIXER STAGE TO SWITCH 51.4

10、 MIXER STAGE s 260 V D- C TO Rl4 AVC STAGE TO R9 (D ALUES OF THESE CIRCUIT ELEMENTS VARY IN J IFFERENT MODELS. VALUES ARE AS FOLLOWS MODEL C2 C6 C9 I BC-669- A 0.0045 MMF I MF 3 MMF I BC-669- B 0.006 MF 0.05 MF 2.5 MMF I BC-669- C 0.0045 MF 0.01 MF 3 MMF GLASS TUBE JAN-65K7 GT/G (VT-117-A) USED IN B

11、C-669-B AND SC-669- C. CATHODE CIRCUIT VARIES BETWEEN MODELS. MAIN CIRCUIT DIAGRAM IS FOR BG- 669-A. CATHODE CIRCUITS FOR BG-669-B AND BG-669-C ARE SHOWN IN SMALLER DIAGRAMS. ) 51 POSITION OPERATION BAND FREQUENCY I CRYSTAL I 1680-2750 KG 2 MANUAL I 1680-2750 KG 3 CRYSTAL 2 2700-4450 KG 4 MANUAL 2 2

12、700-4450 KG sC-669-B ON ORDER NO. 32780-PHILA-43 IS THE SAME AS MODEL BC-669- C. FOR TEST CONDITIONS SEE PARAGRAPH 23 . NOTE: * IS SYMBOL FOR FIXE!? CAPACITOR # IS SYMBOL FOR VARIABLE CAPACITOR 1,000 OHMS Tt. L970 4 Figure 28. Radio Receiver a11d Trm1smitter BC-669-(* ), r-f amplifier stage, schemat

13、ic diagram. 37. Mixer or Converter Stage (Jig. 20) a. FUNCTION OF STAG!:. ( 1) Grid To. 3 of Tul e j N-6SA7 (V2) receives signal voltage amplified by L ube V l through inductive coupling provided by r-f transformer T3 or T-k Primary switching for the two frequency i.Jand. is effected by s1ri tch sec

14、tion S1.3. Secondary switching in two frequ ency bands is provided by switch section Sl.4. The tuned cir- cuit formed by T3 secondary and capacitor section Cl.2 del rmincs the frequency of the signal received by grid No. 3. (2) Tube V2 receives its plate voltage through resistor Rll, the primary of

15、i-f Lra11sformcr TS, and resistor RIO. The vollage is filtered of radio frequency by capacitor C14. ( 3) The cathode of tube V2 is biased by the voltage drop aros resistor R7, a11cl is bypassed by capacitor Cl2. ( 4) A n a-v-e voltage is applied through resi. tor R6 and T3 secondary to gricl No. 3 o

16、f tube V2, and i filtered by capacitor C4l. liltering assi t s in maintaini11g voltage 1-vel, and in preventing over- loading of the tube by very strong signals. /!. REPAIR DATA o N M IXER OR Co VERTER STAGE. Defective action in a BC-669-(*) receiver may be TO R- F STAGE TO C9 TO Sl.3 TO Si.3 TO VI

17、SCREEN GRID (PIN 6) TO R2 V2 0 JAN-6SA7 (VT-150) MIXER caused by faulls on the mixer stage. /mong these arc the following : ( 1) Dead set. This may be due to a defective Tube JAN-6SA7, or to improper tuiK voltages. T he oscillator may not be working, or it nny he operating at a frequency which 1rill

18、 not 1 a . the i-f transformer. The i-f transformer may be defective. H no r-f signal i. present, rub the m tal part of the screw driver on the stator of lhc oscillator tun- ing capacitor. Litlle or no noise in the loudspeaker inclicales a defective oscillator. Cau.tion: Keep fingers or body away fr

19、om the metal part of the scre11 driver. A negative voltage acr ss oscillator grid leak R8 in- dicates an operative o cillator. No voltage, or p si- tive voltage, indicates trouble. lnl111ily or high reading on an ohmmeler across osig11re 3J. Radio !?eceive r a11d T1-a11smiller B -669-* ), i-f alllf!

20、lifir stag!, srhenwtir diagra111s. c. PARTS D ATA. -,-,-.- Ref. symbol CIS CIS C . . Cl6 . . . . . Cl6 C . . Cl7 A,B . C17 C , C18 A,B . . . . C18 C . . Rl2 . . . R13 . . . T5 . . V4 A . . V4 B,C . . V4 B,C . . Signa I Corps stock No. 3D390 3D390 . . . . . . 30390 . 3D390 . . . . . . . . 3DA20-4S 3D

21、A20-45 . 3DA20-45 . 3DA20-45 . . 326801- 16 . . 326033-9 . 229641.ll . t Applies only 10 models mchcolcd. Name of part ancl description CAPACITOR: 200 mmf, 5%; 500 vdcw; molded silver- mica; small postage stamp type . . CAPACfTOR: 200 mmf, So/a; 500 vclcw; temp co f 0.0075; tubular, ceramic . . . CA

22、PACITOR: 200 mm f, 5%; 500 vdcw; molded silver- mica; small po !age stamp type . . . . CAPACITOR: 200 mmf, 5%; 500 vdcw; temp cocf 0.00075; tubular, ceramic . . . APACTTOR: 0.02 mf, -10% +ZOo/a; 400 vdcw; molded pape1 . . . . . CA PACTTOR: 0.02 mf, 20% ; 400 vdcw; molded paper CAPACfTOR: 0.02 mf, -1

23、0% +20% ; 400 vdcw; molded paper . . CA PACTTOR: 0.02 mf, 20%; 400 vdcw; molded paper RESISTOR: -megohm 20% 0 wall; insulated carbon RISlSTO I : 330 ohms I- 0%; Yz wall ; insulated carbon TRANSFORMER, i-f: 385 kc; donbl permeability tuned; contain capacitors C14 and 16; special . . TUBE, J AN-6SK7,

24、VT-117 . . TUBE, JAN-6SK7GT/G, VT.:.l17-A . . . . TLJBE, JAN-6SK7GT/G, VT-117-f . . . 2 Applies only to models indica led on Orders Nos. 32780-Phila lifier slagf, scluJnolic diograi/J. 52 I ST A-F AMP STAGE V5 TO PLATE (PIN B) TO SCREEN GRID (PIN 6) RY I MODEL C26 C27 BC-669-A 0.005 MF 0.0075 MF BC-

25、669-B 0.006 MF 0.007 MF BC-669-C 0.005 MF 0.0075 MF R51 IOOJl 3311. 611. 611. Ll 3.3H IB51l D-C V6 JAN-6K6 GT/G (VT-152) A-F POWER AMP VALUES IN ( ) ARE FOR VI BRAPACK OPERATION I IN I IN R-F :MODULATOR SECTION 1 SECTION CHASSIS 1 CHASSIS I SOl (PIN 6) I I I 47011. 13V A- C (12V D-C) OPEN TO MODULAT

26、OR SIDETONE CIRCUIT TO Bt 260V D-C 6 .5 V A-C (6 V D-C) 1511. 245 (210) V D-C OPEN 260 (220) V D-C 30M 970 M FOR TEST CONDITIONS SEE PARAGRAPH 2 3. TL 19710 NOTE: * IS SYMBOL FOR FIXED CAPACITOR #IS SYMBOL FOR VARIABLE CAPACITOR MI.OOO OHMS Figure 34. Radio l?rcci7cr n11d Trmzsmiller BC-669-(*). aud

27、io-fmwr nnzf!lijicr singe, srlzcnzntir diayrruu. c. PARTS D ATA. ll f. symbol Signal Corps stock No. Nnme of part and description Function 29 A* . . 3DA2-71 . . CAPA ITOR: 0.002 mf 20% ; 800 vdcw; molded n1ica; postage stamp type . . . . . V6 plate bypass. C29 13, * . . . . 3DA2-71 . CAPACITOR: 0.00

28、2 mf 10% ; 2,500 vdcw; molded mica 0 V6 plate bypass. C30 A,B* . . . . 3DAS0-57 . CAPACTTOR: 0.05 mf -10% +20%; 600 vdcw; molded paper . V6 screen bypas . C30 c . . . . . . . 3DA50-57 . CAl ACTTOR: 0.05 m.E 20%; 600 vdcw; molded paper V6 screen bypa s. R22 . . . . . . . . 326802A2-9 . . RESIST R: 2.

29、2 megohms 20% ; 0 watt; insulated carbon . . . . Sidetone coupling. R23 . . . 326047- 7 . . RESI TOR: 470 ohms 10% ; 2 watts; insulated carbon V6 cathode bias. lW . . . . . . . . 326001 E S-2 . RESISTOR: 15 ohms 10% ; 10 watls . V6 fil dropping. V6 . . . . . . . . . . . . . . . . . . . . . . . TUBE,

30、 JAN-6K6GT/G, (VT- 152) . . . . . . . . Revr audio-power output . V6 B,C* . . . . . . . . . . . . . . TUBE, J AN-6K6GT /G, (VT- 1252) . . . Rcvr audio-power output. Applies only to indicated morlcls. 55 r- S ll I I mil I _._- C98 lew osc CONTROL lew -oscl SWITCH BFO I l I I I I ! C95 I TL:=:=2=M=M=F

31、=1:,.;-) IF 5 TERM INAL, PLATE T -V7 SOCKET L_ _ . - NOTE j_ IS SYMBOL FOR FIXED CAPACITOR T # IS SYMBOL FOR VARIABLE CAPACITOR. M= 1,000 JL _ j Fignre 35. Radio Rece,:ver and Tmnsmil!ers BC-669-AM, -BM, and -CM, beat-frequency oscillator stage. TLII9525 d. PARTS DATA (H.eceiver). Hcf. symbol C94 95

32、 C96 C97 98 C99 R79 R80 Sl.l T17 . . . . . . . . . . . . . . . . 0 . . . . . . . . . . . . . . VT-94 . Signal Corps stock No. (*) . . 3D9003- 12 . . . . . . 3K2551143 . . . . . . (*) . 3kC21BE154M . (*) . . . 329825-80.2 . . . 229641.182 2J6JS . . . Indicates stock not available. Name of part and de

33、scription CAPACITOR : fixed; m1ca; 3 mf ; 20o/o; 500 vdcw; Dubilier type 5WLS . . . . CAPACITOR: Same as C95 . . CAPACITOR: fixed; silver mica; 500 mf; 2%; 300 vdcw; JAN type CM25D50011G . . . CAP A CIT OR: Same as C97 . . RESISTOR: fixed; carbon; 150,000 ohms; 20%; 0 F unction Plate bypass capacito

34、r. Coupling capacitor. Grid coupling capacitor. Padding capacitor. Pitch control capacitor. Padding capacitor. Plate voltage-dropping watt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . resistor. SWITCH: rotary; selector ; 7 pole; 4-position; 3-section

35、; Erla No. 13848 (for model C only) . . COIL ASSEMBLY: radio; bfo; iron core; Erla No. 16117 . . 0 0 TUBE: AN-65 . . Grid bias resistor. Circuit selector. B-f-o plate inductance. Oscillator tube. 57 / PLACE B-t DET A-F AMPLR V5 TERM *5 OF DET AMPLR V5 SOCKET BFO V7 JAN-12SN7GT 4 CATH TERM *3 CI03 -!

36、-+- OF SOCKET V7 4.0MF RSI 33M I 500MMF I I I I I I R26 Cl08 I C96 OIMF L _ - R83 525 SQUELCH CKT NOTE : _LIS I SYMBOL FOR FIXED CAPACITOR. TL 11353 S 71s SYMBOL FOR VARIABLE CAPACITOR. M=-1,000 .fl. Fignre 36. Radio Recriver and Trrmsmillcr BC-669- D, beat-frcqurnr) osrillator stage. 1. PARTS DATA

37、(Model D) (Receiver.) Ref. symbol C92 C93 C94 C95 C96 C103 H.2S R26 RSO R81 R83 T l7 . . . . . . . . . . . . . . . . . . . . . S2.5 . . V7 . . . Signal Corps stock No. (*) . . 3K2551 143 . . . . . . . . . . . . . . . . 3DA 100-112.1 . . . . . . . 3DJ34-165 . . 3Z661 0-70 . . 3RC2li3E-t73K 3RC21BI622

38、 . 3.RC21 HE333.f . 3R 2JBE2241 229641.182 . 329825-62.170 . 2.)12SN7GT . * Indicates s(ock not available. 58 N:une of part and dcscriplioJJ CAIA !TOR: fixed; silver mica; SOD mmf; 2/o; 300 vdcw; JAN type ClVI25JYiOO II G . . . . . . . . CAP A CTTOH. : Same as C93 . . . CAPACITOR: fixed; paper; 0.1

39、mf 20%; 100 Clr11 molded mica; lypc 345-21 . . CAP A ITOR: Same as C95 . . . CAPACfT R: f1xed; paper; 4 mf +I-t% -6%; SO vdcw; Gudcman No. 7541 . . RESISTOR: fixed; wire-wound; 10,000 ohms 10o/o ; 10 walt; Utah lype VWQ . . RESISTOR: fixed; carbon; 47,000 o.hms, 10%; 1 11att RESTSTOH; fixed; carbon;

40、 6,000 ohms, l Oo/o; 0 wall RES! TOH: fixed; carbon; 33,000 ohms, 20%; 0 wall RESISTOR : fixed; carbon; 220,000 ohms, 10% ; % watt . . . COIL ASSIMBLY: radio; bfo; iron core; Erla No. 16117 . . . . SWITCH: rotary; 2 position; 6 pole; Erla No. 16101 . . TUBE: JAN- l2SN7GT . . F11nction lilch c0nlrol

41、capacitor. l adding capacitor. Grid COI!Jlling capacilor. Filter capaci10r. Fillrr capacilor. Ca1hodc wupling capacitor. Pial 1 ollagc-dropping resistor. Vollagc rCgulaling rcsislor. Resistance filler. Crid leak resislor. Squelch calhode 1oltagc dropping. B-f-o plate inductance. Cir uit sclcclor. Os

42、cillator tube. -T7- I 3 I I I I I C37 6-25 MMF I I L _ J r- 1 T8 3 I I I I I I I 4 I L _ _ _ _ j FOR TEST CONDITIONS SEE PARAGRAPH 23. C38 500 MMF CD GLASS TUBE VT-94D, JAN-6J5GT/G USED IN MODELS BC-669-B S BC-669-C 5 1 POSITION OPERATION BAND FREQUENCY I CRYSTAL I 16B0-2750KC 2 MANUAL I 1680-2 750K

43、C 3 CRYSTAL 2 2700-4450KC 4 MANUAL 2 2700-4450KC V3 JAN-6J5 CD (VT-94) OSCILLATOR C33 0.02MF 51 .7 TO B+ 260V D-C TO RB MIXER STAGE $3.7 NOTE:* IS SYMBOL FOR FIXED CAPACITOR. #IS SYMBOL FOR VARIABLE CAPACITOR. 21 0 (190)V D-C MI,OOO OHMS. 40M 12 6V A-C (12V D-C) OPEN o.ov O.OJl 47M VOLTAGES IN ( ) ARE FOR VIBRAPACK OPERATION TL 19711 Figure 37. Radio Receiver and Trallsmittcr BC-669-(* ), transmilter