RCA-Victor-Co-Inc-87Y 电路原理图.pdf

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1、PAGE 3 6 4- B MODELS 87EY, 87X, and 87Y Seven -Tube, Three -Band, AC -DC, Superheterodyne Receivers Model 87EY Model 87X Electrical Specifications Model 87Y FREQUENCY RANGESR -F ALIGNMENT FREQUENCIES Broadcast (A)530.1,720 kcShort Wave (C)20,000 kc (osc.) Medium Wave (B)2,100,6,800 kcMedium Wave (B)

2、6,000 kc (osc., ant.) Short Wave (C)6,800.22,000 kcBroadcast(A)600 kc (osc.), 1,500 kc (osc.) Intermediate Frequency460 kc RADIOTRON COMPLEMENT ( 1 ) RCA -6A8First Detector-Oscillator(5) RCA -25L6Audio Power Output (2) RCA -6K7Intermediate Amplifier(6) RCA -25Z5 Half -Wave Rectifier (3) RCA -6H6Seco

3、nd Detector and A.V.C.(7) RCA -95K2Ballast (4) RCA -6J7Audio Voltage Amplifier Pilot Lamps (2) Mazda No. 40, 6.3 volts, 0.15 amp. POWER SUPPLY RATINGS A,C Rating 105,125 volts, 25,100 cycles, 55 watts D -C Rating 105.125 volts, 50 watts POWER OUTPUT Undistorted (125 -volt, a -c supply) 87EY, 87Y 1.9

4、 watts Maximum3.0 watts 87X 1.7 watts 2.8 watts Loudspeaker (Permanent -Magnet Dynamic) 6 RECT. LIT BALLAST POWER OUTPUT (125 -volt, d -c supply) 87EY, 87Y87X Undistorted1.3 watts1.2 watts Maximum2.1 watts1.9 watts Impedance (v.c.) 2.2 ohms at 400 cyder C30 -0SC., C32-0SC. SEC. ADJ., SEC. ADJ. 6,000

5、 K.C.ISO K.O. L9,TO L7 460 K.C.(TERM. -C 460 K.C. AUDIO OUT UT 5 (11D 4 611 C39 C40 I,F 2;F,j 2 3 TRAN 6K7 YELLOW DET13 HOLE ;.A.V.0 - ANT. SPEAKER/ MODELS, 5897EITL SPE AoSER IS MOUNTED ESTERNA MOM CHASSIS ANT 0 SC C7 3S0 mmr. I. I F RAMS 6A8 sc. /I CB -ANT. C27-OSC. LIS -0SC 6300K.C.20,000K.C. 600

6、K. C. TOP FRONT OF CHASSIS R1 470,0004 Precautionary Lead Dress.-(1) Dress power cord away from audiocircuits.(2) Keep filament leads away from C24.(3) Keep bus lead. from term. 8 of S1 -S2 to ground lance as short as possible.(4) Bus lead from term.12 of S1 -S2 to C27 -C28 thence to C10 should be 4

7、5/8 inches long. (5) Bus lead from term. 4 of S1 -S2 to L2 -L3 should be 21/2 inches long.(6) Bus lead from L2 to C8 -C9 should be 37/8 inches long and dressed over bus lead from antenna coil to range switch.(7) Bus lead from term. 7 of S1 -S2 to L12 - L14 should be 21/4 inches long. (8) Keep bus le

8、ad from term. E of 2nd i-f trans. to term. 2 on phono. board as short as possible.(9) Keep leads of C10, C29, and C34 as short as possible.When replacing bus leads, use enly wire having same diameter as original. -Radiotron, Coil, and Trimmer Locatione RCA VICTOR DIVISION OF RADIO CORPORATION OF AME

9、RICA, CAMDEN N. J., U. S. A. 收音机爱 好者资料库 RadioFans.CN Cl 150 MMF CONNECT LINK TO TERM. A WHEN INTERFERENCE FROM STRONG LOCAL_ BROADCASTING STATION IS ENCOUNTERED. AG C2 .005 MFO LI a- l 6.3n t. 1. C3 400 MMF C4C6C7, 1ST DET. TMFD mroFlmnip,6A8 L2 1 C9 11-490 MMF 8 .04.7-7-1, -74=-J7C T- 3 B 2 SI (ROT

10、OR) MOVABLE SEGMENTS CHASSIS cs nhn 0.25 MFD. C28 11-490mm F. L3 15/ R1 410,700 L4, es 3n62-15 MMF. L5-PRI. 42A C10- 56 MMF. C27 2-10 MMF. RANGE SELECTOR SHOWN INA BAND POSITION. ROTATE KNOB CLOCKWISE FOR ANDBANDS 12 S2 C31-3600mmF 10.-.10-3-3ommE-1 C33 600 MMF. MOVABLE 5 SEGMENTS (ROTOR) I -*r -4.-

11、, .- C32 /77777 3-30 _ MMFC34 .005 MFD /,/,A270,000n R20 L11L12 SWITCH 1/P PROGRESSES T HIS DIRECTION 10,000 C29 3600 MMF L13-0.2 , L14 LIS L16 4.3n 1.91 P-84 0S -7- R13 220077 C13 MMF 6K7 1.2n 7211 C35 .05 MFD C14 0.1 MFD RECT. 25Z5 II - C37 32 MFD. S31 POWER SW. (MOUNTEDON S4 SHAFT) C15-120 MMF. C

12、36 3600 MMF 321LINK CLOSED FOR RADIO fm020F305 6AUDIOJ7 I_, Fa 4 Lu 4 1 0 2 .17:. O N ;-. ,-u0 CI6 ,.-,I.1 .I c.r .3 r-, En O120MMF. .Ez o DC o OD 0i- .Z R4 190o0 2.2 MEG CC MMF. n o RE ,rt IE 2200004aC19,-1 -t 4(iI,; 120,000n. PHONO.TERM.BRD. 2DET. 6H6 L9 Pa T2,. 87 X- .007 MFD 87Y-007 MFD. 137EY -

13、.01 m ED. 82,000n R17-5600n. C39 LC40 1616 MFD.MFD. R16 22,00 On. LnII ,x)IN A, R9518.a.0 0 n.11441DIAL LAIYIPS ,-, I r-. ,., , op ,f -. AS TEMP RISES RESISTANCE BALLAST TUBE- 7INCREASES FROM 30rt TO 80rt 95K2 -Schematic Circuit Diagram Onsomeinstruments, R15is68,000 ohms and R16 is33,000 ohms. C24

14、.01 MFD. ,MODEL 87X TONE CONTROL CLOSEFOR BASE OUTPUT /OPEN FOR TREBLE 25L6Ti C26 .07 MFD TYPE 171-PRI. 76493-3176 ErTY 71-31740.22 SPEAKER RESISTANCES C25 .015 MFD. Tl-SEC.(.10 0.262 1.8CO P1 Co X (:() Inci 收音机爱 好者资料库 RadioFans.CN PAGE 366-B 87EY, 87 X then ad- just the small (vernier) pointer to 0

15、.These are friction adjustments. Procedure Increased Sensitivity: TheI -Fcircuitsoftheseinstrumentsare aligned in the factory to produce a good balance between sensitivity and tone quality.In local- ities where sensitivityisof greater importance than tone, an increase can be obtained by re- aligning

16、 theI -F stages, usingthe output meter method. A battery operated test oscillator should be used as the source of signal, with its output connected thru a capacitor to the 6A8 grid, and its ground lead attached to the G terminal of the receiver input. The usual output meter or indicator must be conn

17、ected either across the speakervoicecoiloroutputtransformer primary.Itispreferable,ifconvenient,to use a1/1isolationtransformerinthe AC power circuit.EachI -Ftrimmershouldthenbe adjusted to produce maximum peak output, Connect the low output terminal of the test oscillator to the positive (+) side o

18、f C38 (same point as low vertical input to cathode-ray oscillograph) for all alignment opera- tions. Order of ment Test Oscillator Range Selector Receiver Dial Setting Circuit to Adjust Adjustment Symbols Adjust to Obtain Connection to Receiver Dummy Antenna Frequency Setting 1 6K7 I -F Grid Cap .00

19、1 mfd.460 kc A. Left No Signal 550-750 kc 2nd I -F Trans. 1.8 and L9Max. (peak) 2 6A8 Det Grid Cap No Signal 550-750 kc 1st /-F Trans. 3Ant. Term. 300 Ohms20,000 kc C Right20,000 kc C Osc. C27Max. (peak)* Max. (peak)* 4Ant. Term. 300 Ohms6,000 kcB Center 6,000 kcB Osc. C30 5Ant. Term. 300 Ohms6,000

20、kcB 6,000 kc B Ant.C8 Max. (peak) 6Ant. Term. 200 Mmfd.600 kcA Left 600 kc A L -F Osc. L15Max. (peak) 7Ant. Term. 200 Mmfd.1,500 kc A1,500 kc A H -F Osc.C32 Max. (peak) 8Ant. Term. 200 Mmfd.600 kc ,A., 600 kcA L -F Osc. L15Max. (peak) 9Ant. Term. 200 Mmfd. 1,500 kc A, 1,500 kcA H -F Osc. C32Max. (pe

21、ak) *Use minimum capacity peak if two peakscan be obtained. *After this adjustment, check for image signal by shifting receiver dial to 19,080 lcc. 收音机爱 好者资料库 RadioFans.CN PAGE 367-B ANT. COIL CONNECTIONS BROWN GREEN1 TI BLACK BLACK BROWN SPEAKER CONNECTIONS OSC.COIL CONNECTIONS 030-00A NI00 ciSA 87

22、EY, 87 X & 87Y AS TEMPERATURE RISES RESISTANCE INCREASES FROM 30n TO 80 A BALLAST TUBE CONNECTIONS BOTTOMTOP Is I.F. TRANSF. CONNECTIONS C17 180 MMF R5 - zz000.n. REPLACEMENT PARTS R6 C15L8 .110mr0F.T.Ert. BOTTOMTOP 2I.F.TRANSF. CONNECTIONS Insist on genuine Factory -tested parts, which are readily

23、identified and may be purchased From authorized dealers. STOCK No. DESCRIPTION STOCK No. DESCRIPTION RECEIVER ASSEMBLIES 13716Resistor -2,200 Ohms -Insulated,1watt (R13) 11647Resistor -5,600 Ohms -Carbon type,* watt (R17) 14380Arm -Band indicator operating arm and hub -less set 13736Resistor -10,000

24、 Ohms -Carbon type,* watt (R3) screw Stock No, 14350 14284Resistor -22,000 Ohms -Carbon type, 1/10 watt (R5) 14388Belt -Variable condenser drive belt11305 Resistor -22,000 Ohms -Carbon type,* watt (R16) 14623Board -Antenna and ground terminal board 12454Resistor -33,000 Ohms -Insulated,*watt (R2) 12

25、717Board -Phonograph terminal board11300 Resistor -33,000 Ohms -Carbon type, 1/10 watt (R8) 14338Bushing -Variablecondensermountingbushingand14023Resistor -82,000 Ohms -Insulated, kwatt (R15) screw assembly11281 Resistor -100,000 Ohms -Carbon type, 1,1.0 watt (R12) 12607Cap -First I -F transformer s

26、hield top14560 Resistor -100,000 Ohms -Insulated,1watt (R11) 12581Cap -Second I -F transformer siield top13734 Resistor -120,000 Ohms -Carbon type,1 watt (R14) 11350Cap -Grid contact cap11398 Resistor -220,000 Ohms -Carbon type, 1/10 watt (R6) 12110Cap-Radiotron shield cap11323Resistor -270,000 Ohms

27、 -Carbon type,* watt (R20) 14383Capacitor -Adjustable dual trimmer (C30, C32)13479 Resistor -390,000 Ohms -Carbon type,1 watt (R10) 14392Capacitor -4.7 Mmfd. (C6)11452 Resistor -470,000 Ohms -Carbon type, 1/10 watt (R1) 12723Capacitor -56 Mmfd. (C10)12285Resistor -470,000 Ohms -Insulated, * watt (R9

28、) 14262Capacitor -110 Mmfd. (C12, C13)12679Resistor -2.2 Megohm-Insulated, * watt (R4) 12404Capacitor -120 Mmfd. (C15, C16)30284Resistor -Ballastresistortube type No. 95K2 (R18, 12725Capacitor -150 Mmfd. (C1)R19) 12406Capacitor -180 Mmfd. (C17)14350 Screw -No. 8-32x3/16 square head set screw for gea

29、r 14625Capacitor -270 Mmfd. (C23)Stock No. 30085 and drum Stock No. 14345 and arm 13894Capacitor -390 Mmfd. (C7)Stock No. 14380 14391Capacitor -600 Mmfd. (C33)14374Shield -Antenna coilshield 12811Capacitor -3,600 Mmfd. (C29, C31, C36)12008Shield -First or Second I.F. transformer shield 5005Capacitor

30、 -.0035 Mfd. (C20)14375Shield -Oscillator coil shield 4838Capacitor -.005 Mfd. (C2, C34)14171Socket -Dial lamp socket 5148Capacitor -.007 Mfd.(C19)(Models 87X and 87Y 4786Socket -6 -contact 25Z5 Radiotron socket only) 11196Socket -8 -contact 6A8, 8K7, 6J7, 6H6, or 25L6 Radio - 13138Capacitor -.01 Mf

31、d. (C11)tron socket 14393Capacitor -.01 Mfd. (C19, C24) (C19, .01Mfil. used in Model 87EY only) 12007Spring -Retaining spring for core Stock No. 12006 and Stock No. 12800 11315Capacitor -.015 Mfd. (C25)12907Spring -Tension springfor indicatordrive gear Stock 4886Capacitor -.05 Mfd. (C4, C35)No. 3008

32、5 14626Capacitor -.07 Mfd. (C26)14342Spring -Tension spring for idler Stock No. 14341 4839Capacitor -0.1 Mfd. (C14, C22)14370Switch -Range switch (S1, S2) 12484Capacitor -0.25 Mfd. (C5, C18, C21)14371Switch -Tone control switch and power switch (S3, S4) 14624Capacitor -10 Mfd. (C38)14376Transformer

33、-First I.F. transformer (L6, L7, C12, C13) 14621Capacitor -32 Mfd. (C37)14283Transformer -Second I.F.transformer(L8,L9,C15, 14622Capacitor Pack -2 sections each 16 Mfd. (C39, C40)C16, C17, R5, R6) 14372Coil -Antenna coil and shield(L2, L3, L4, L5)13838Trap -Wave trap complete (Li, C3) 14373Coil -Osc

34、illator coil and shield (L11, L12, L13, L14,14335Volume Control (R7) L15, L16)14379Washer -Felt washer for indicator pointer 14363Condenser -2 gang variable tuning condenser (C8, C9, C27, C28) REPRODUCER ASSEMBLIES 5119Connector -3 -contactfemaleconnectorforreproducer MODEL 87X (76493-3) cable 14885

35、Cone -Reproducer cone (L10) 12800Core -Adjustable core and stud assembly for coil Stock 5118 Plug -3 -contact male plug for reproducer No. 14373 14684Reproducer -Complete 12008Core -Adjustable core and stud for Stock No. 14376 and Stock No. 14283 14686Transformer -Output transformer (T1) 14381Dial -

36、Station selector dial scale REPRODUCER ASSEMBLIES (RL-71-3) 14389Dial -Band indicator dial and mounting bracket assembly (Models 87X and 87Y only) MODEL 87Y and 87EY 30127Dial -Band indicator dial and mounting bracket assembly 12687Cone -Reproducer cone and dust cap (Model 87EY only) 5118Plug-3scont

37、act male plug for reproducer 14364Drive -Variable condenser vernier pinion gear and shaft 14627Reproducer -Complete 14345Drum -Variable condenser drive belt drum complete with set screws 14628Transformer -Output transformer (T1) 11982Fastener -Station selector dial scale fastener MISCELLANEOUS ASSEM

38、BLIES 30085Gear -Indicator drive gear and hub assembly and indi- 14398Escutcheon-Station selector escutcheon and crystal Knob -Station selector knob cator pointer stem and gear assembly complete14359 14341Idler -Station selector drive belt idler 14269Knob -Volume control, tone control or range switc

39、h knob 14344Indicator -Station selector indicator pointer 4560Screw -Chassis mounting screw and washerassembly 14382Indicator -Vernier indicator pointer (Model 87EY only) 4340Lamp -Dial lamp 11210Screw -Chassis mounting screw and washer assembly 14340Pulley -Station selector drive belt pulley and kn

40、ob shaft (Model 87Y only) 14620Reactor -Filter reactor (L17) 11377Screw -Chassis mounting screw and washer assembly 14361Reflector -Dial reflector and lamp bracket assembly (Model 87X only) 14343Retainer -Drive shaft and pulley retainer -holds tuning 4982Spring -Retaining spring for knob Stock No. 14359 knob shaft and pulley on range switch shaft14270Spring -Retaining spring for knob Stock No. 14289