RCA BC-3C Instructions Manual Download | Manualshive

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Summary of Contents for BC-3C

Page 1: ... BROADCAST AND COMMUNICATIONS I PRODUCTS Type BC 3C Siandard Consolelle MI 11641 A 115 V M 1 11641 B 22 0 V I 1f I or F I I _ 4 11 24789 5 ...

Page 2: ...telephoned telegraphed or teletyped to RCA Emer gency Service Bldg 60 Camden N J Telephone WO 3 8000 Dominion of Canada RCA Victor Company Limited 1001 Lenoir Street Montreal Quebec or through your local Sales Representative or his office Outside of Continental United States Alaska RCA International Division Clark N U S A or through your local Hawaii and the Dominion of Canada Sales Representative...

Page 3: ... 220 V In order to make improvements in design and effect econo mies in manufacture RCA reserves the right to make changes in design components and specifications published herein RADIO CORPORATION OF AMERICA BROADCAST AND COMMUNICATIONS PRODUCTS DIVISION CAMDEN NEW JERSEY PRINTED IN U S A 18 24789 5 ...

Page 4: ...1 2 Figure I Type 8C 3C Standard Consolelle ...

Page 5: ...AU7 2 12AX7 1 5R4GY 5 12AY7 5 MI 11299 selected nAY7 Dimensions and Weight Width 33 inches Height ll l 4 inches Depth 211 4 inches Weight 88 pounds Finish two tone umber gray DESCRIPTION The BC 3C Standard Consolette is designed to handle the programming schedules of a station equipped with one or two studios an announce booth a control room two turntables one tape recorder and one auxiliary such ...

Page 6: ... 5ATI 41 1 S7 c UE r 47 EX MON INPUT n 4 Ii T 4 SAT4 I i 5Sb A OS9 P C A P OSII A P OlZ r L 19 150 n AuX A OFr RE 21 513 o _ r LINE 0 _ 1 600Cl MON AMP RELAY L J 5 14 2 600 5P l1 I I POWER SUPPLY NET ur v PkONE I I 08 1 100 I OV IO 60 V C IIR7 N A I D 637 B77 2 51 57 63 20013 151l 6 C R 5PK R d 77 I 0 C R ON AIR j 1 151l 6 STUOIO L 5PK R o J I 7 9 8 0 ITO 0 A R K2 ...

Page 7: ...e circuit of the microphone preamplifiers is shown in the schematic diagram of figure 5 The input signal is derived from an unloaded step up transformer which is mounted under the preamplifier mounting shelf and is applied to the grid of the input stage This stage is RC coupled to the second stage with negative feedback from the plate of the second stage applied to the cathode of the input stage T...

Page 8: ...resistor 1Rl4 is added to roll off of the high fre quency response above 15 kc As shown in figure 6 this amplifier is similar to the one shown above Since no switching is per formed in the output the second output capacitor le6 and shunt resistor 1R13 are omitted A series 2 lR1 8200 lW o IRS 330K 5 1R6 S2K lR7 16K 1W Program Amplifier SAR6 The program amplifier etched circuit board con tains all t...

Page 9: ...s a pair of 6V6GT tubes are used in a push pull output stage Approximately 1 32 volts input are required to obtain 1 watt output The transformer secondary has taps for 600 150 16 8 4 ohm loading Power Supply 5PSl The powcr supply is designed for operation from a 100 130 volt 50 60 cycle or a 205 240 volt 50 60 cycle powcr line Transformer primary taps are available for nominallinc voltagcs of 105 ...

Page 10: ... 2 3 2R 120K 2CS 20 JUT r 6 2 12 Go 12AU7 2V3 co 12AU7 2RII 10K OUT 3 29SI 9 2o 7 Fe 8 p 7 3060 0 Figure 9 Schematic Program Amplifier 5AR6 OUT c 4 4 3C7 20 3R12 6800 3RI3 22 K Figure lO Schematic Monitor Amplifier 5AR7 Z8SY 6 FEEDBAC K 3 C 753Oe7 1 ...

Page 11: ... type hav ing a loss of 6 db The external momtor pad 5AT13 is of the balanced L type having a loss of 30 db 9 Speaker Muting ond Warning Light Relays 5Kl and 5K2 Relay SKI controls the control room speaker and control room ON AIR light Relay 5K2 controls the Studio speaker and Studio ON AIR light In the de energized position the speakers are on and the warn ing light circuit is open In the energiz...

Page 12: ... r OOV 4R9 i 100 2 HUll AOJU rOC 24V N W 26 01 A lrtO 4RIA 100 4ru O lW 4 IRla 4R Z 7 0 A a Co 40 40 40 tw I OO 50 01 4R A 100 0 4R5B 4R5C 1000 1000 1 A a r 4C2 40 40 40 4RII 1200 2W 4R5D 1000 4R7 10K I IW An 1 4 4 40 40 40 0 6432 64 4RI UK IW 4R IZ 10K IW 4 5 A B 40 40 I 4A1 6800 w 4Rll ZfwK J AJ 40 40 c Z C r z 2 7 V BI oov B2 90 1D 6 V 1M 6 U 4C 40 90 86 265 01 aJ 290 01 a 6 HI 6 V 4A HZ Rt 2 4...

Page 13: ... a90 2 7 02 If i CT LI NO OPE H 7 _ 8 I 0 z 3 O 6 4 60 1 62 63 1105 6 64 B 4 6 4 4 32 4R 2 31 4R 2 1 r NOTES I THE fOLLOWINC WIR 5 RE TWI 5TED PAIR5 20 21 20 30 90 100 2 SOLDER ALL lECTRICAL CONNECTION U IN ITEIoi 67 3 FlEND TtRMINAL5 Of 4R TOWARD BOTTO Of C HAS5IS O 4 R9 T1 o 100 4R9 t JO 4XVI t O TSI 20 4XY 1 6 T 4O 4TI l I _I 2 4 Vt b 80 4CRI 2 62 4CI 4 I O CRI 3 120 4XV1 4t 11br l l K_t I C9 2...

Page 14: ...dphone monitoring cue feed and program receive functions INSTALLATION Location of ConsoleHe The BC 3C Consolette may be installed on any flat top desk or table of suitable size A minimum of Vz inch clearance should be allowed between the rear of the consolette and the wall Refer to the typical in stallation and dimensional drawings figures 15 and 16 Removal of Shipping Bolts Remove the red nuts an...

Page 15: ... supply chassis Turn the power supply upside down Remove the wire leading to terminal 3 of the power transformer 4Tl If the line voltage is between 100 and 110 volts connect this wire to terminal 2 if it is between 120 and 130 volts connect the wire to terminal 4 Replace the power supply Connect the ac power line to the barrier type terminal block 4TB1 directly behind the power transformer For con...

Page 16: ...transformer 5T4 is connected for 600 ohm in put If desired it may be reconnected for 150 ohms by STO MON SPK MIC removing wire connected to terminal 1 and connect ing it to terminal 2 and removing wire connected to terminal 6 and connecting it to terminal 5 Line Equalizer An Equalizer such as the RCA BE 2A MI 11752 for compensating the frequency response of the Re mote and Network Lines may be con...

Page 17: ...e Cue Feed Control Room Speaker Studio Speaker Control Circuit Control Circuit Relay Supply 24 V Not used Control Room Warning Light Studio Warning Light 31 32 t 33 34 35 36 37 38 Warning Lights 39 40 Studio warning lights MI 11706 Series may be 1 operated from the speaker muting relays It is ad 4 46 le to use a MI 11702 A Warning Light Relay 47 4 j with each warning light The Control Room signal ...

Page 18: ... a 600 ohm load connected to the program output terminals If it is desired to have the meter read 0 at another output level replace resistors 5R3l 5R32 and 5R33 with the values con tained in the table shown below Output Level SR31 SR32 SR 13 DBM ohms ohms ohms 2 3600 0 omit 0 4047 447 16790 2 4482 883 8180 4 4896 1296 5220 6 5279 1679 3690 8 5626 2026 2741 10 5934 2334 2091 12 6203 2603 1621 14 64...

Page 19: ...f monitor input 5S11 AUX 5AT8 Green Auxiliary Input selector switch 5S15 5512 MIXER SWITCHES A P 55 Black When in position P connects the mixer control to the 551 5ATI A P 556 Black program channel 552 5An A P 5S7 Black 5S3 5AT3 A P 5S8 Red 554 5AT4 A P 5S9 Blue 5AT5 A P 5510 Blue When in position A connects the mixer control to the 5AT6 A P 5S11 Black audition channel 5An A P 5S12 Green 5AT8 REMO...

Page 20: ...nitor Input Selector with 5S15 to AUD 5 The audition may be heard as when monitoring a program To put network program on the air 1 Move the key switch 554 to NET 2 Move Mixer Switch 5SS to P 3 Turn MON INPUT switch 5S15 to PGM 4 Turn up MIX 4 5 Adjust MASTER gain control to desired level 6 Network program may be heard over both loud speakers With the MON GAIN control adjust the volume of the louds...

Page 21: ...ct the output of the turntables to the CUE position on the monitor input selector switch 5S15 It is also possible to connect to an ex ternal cue amplifier see Installation Remote Line Selector Switches 5513 and 5514 Switch 5S13 controls remote line 1 switch 5S14 controls remote line 2 The function of these four position switches is to 1 Disconnect the remote line OFF 2 Connect the remote line to t...

Page 22: ...s need to be re moved from the circuit boards to service these as semblies Power Supply SPSl The power supply chassis is secured to the con solette cabinet by the four screws one in each corner To gain access to the components and wiring under neath the chassis remove the screws and carefully turn the power supply upside down The intercon necting leads are long enough to permit this change in posi...

Page 23: ...through the hole with pliers c To remove the defective component snip the leads off at the component side of the board see figure 19 d Using a small soldering iron 35 watts or less heat the leads and remove them from the printed wiring side of the board Be careful not to apply too much heat or force to avoid damage to the thin cop per conductors e Clean and preform the leads of the new com ponent ...

Page 24: ...t step tappered to infinity 211002 Resistor variable composi tion 100 000 ohms 10 2 w Fixed Pad parts listed under Fixed Pads Fixed Pad parts listed under Fixed Pads Fixed Pad parts listed under Fixed Pads Capacitor fixed paper 0 47 mf 20 400 v Capacitor fixed paper 0 033 mf 10 400 v Capacitor fixed mica 330 mmf 10 500 v Fuse 3 amp 125 v slo blo Jack open circuit Relay DPDT Meter VU 209286 79191 9...

Page 25: ...ener Shield tube 4 ID x 1 ht aluminum Support fall single link 61 f j Ig with 51 2 slot 211034 213250 213251 96145 94641 17269 215877 94444 96928 94446 94441 94442 96929 211029 20752 98480 211035 94647 PRE AMPLIFIERS SARl SARS ICI Capacitor fixed paper 0 047 mf 10 400 v Symbol No IC2 IC3 IC4 IC5 1C6 IRI lR2 lR3 IR4 lR5 lR6 lR7 IR8 lR9 IRI0 IRll lRI2 lR13 lR14 lXVI lXV2 2Cl 2C2 2C3 2C4 2C5 2C6 2Rl ...

Page 26: ...r fixed composition 270 ohms 5 1 w R5 R6 Resistor fixed composition 18 ohms 5 1 w 218221 59928 99149 209284 207707 Symbol No Description Board circuit etched with 6 ter minals FIXED PADS 5AT12 R1 to R4 Resistor fixed composition 100 ohms 5 1 w R5 Resistor fixed composition 820 R1 R2 R3 4ClA C 4C2A C 4C3 4C4A C to 4C6A C 4C7 4CR1 4RlA B 4R2 4R3 4R4 4R5A D 4R6 4R7 4R8 4R 9 4RI O 4R11 4R 12 4R1S 4Tl ...

Page 27: ...AIR I 0 GR 5R40 MIG 4 A 66 5PKR 73 24 V 74 OJ 79 STD 80 ON AIR 69 67 STD 5R 70 69 SPKR 71 72 5K2 CONTROL CIRCUIT 57 58 A e9 24865 0 MI 1164 A MON AMP Figure 20 Control Circuits R3 R3 RI R2 R4 R4 R6 R3 5 ATII 5ATI3 5ATI2 Figure 21 Fixed Pads 5ATll 5ATl3 5ATl2 ...

Page 28: ... cO e CD 12AX r 5 12AY s iD 5 MI 1129 9 s t i o t o s o i iD 5C2 5K2 _i JiII ii _ 5AT7 5AT9 55 I L 516 552 8695 t N Q 1 ...

Page 29: ...E 1 i 23 2 4 RC 2 R 4 1000 oon R OTC L C TO I REMOT 2 L TOR 514 I 1 PHON 5R JI 6 O n _ I Ir 27 28 AT l D8 1 7oon XT ON 620 0 2 700tl l If TI Z 606 1 loon loon PC L1Nt OUT 8200 54 100 1 oRl 5n 56000 HI 5R33 HZ Z 70QJl 60 64 63 oR R 7 I S O oon IW ZOilC On 5P51 f QW R UPPLY AC POWER 1NPUT 100 130V 50 60 CPS OR 205 240V 50 60 CPS R LA 0 HEM CONP N M sYMSOL Ov G REF PREF1 PRt I MPLrFIER I 5ARI 5AR2 5A...

Page 30: ...OR ABOvE WlR TABLE SEC 0 6 B91e712 02 NOTE I JOLOfRALL ELf TRIC AL t ONNfCTlON U51NCJ ITEl 1 2 C ABLf l THEN LAC E WIR WHERE N CE55ARY U IN6 LAC IN6 C ORD ITE I 3 S0LDER LL1H ND5 OF THE SHIELD Of THE HIELOED C BltS ON 5TB TO GROUND BU jND2 4 THe FOLLOWING WIRES ARE TWI TCO PAIRS 121 BO III I 192 19 194 95 19 1 O i 2 2 703 O i 20 20 260 1 Z64 266 291 292 267 2 72 J6 1 o figure 24 0verall Connection...

Page 31: ...HIS SHEFT THE BC 3C IS A SINGLE CHAm lEL AUDIO CONSOLETTE WHICH PROVIDES AUDIO AMPLIFICATION A 1 CONTROL FACILITIES FOR AM FM TV STATIONS TIll COr mOLETTE WITH ITS SELF CONTAH ED POWER SUPPLY MAY BE MOUNTED ON A FLAT TABLE TOP ELECTROn TunE Co PLEMENT REc UIRED FOR ITEM 1 ABOVF MAY BE ORDERED SEPERATELY AS MI 11486 A l RCA 5R4 GY 2 RCA 6V6 GT 2 RCA 12AU7 2 RCA 12AX7 5 12AY7 5 MI l129 nOA SELECTED ...

Page 32: ...RADI O CORPORATION OF AMERICA BROADCAST AND COMMUNICATIONS ODUCTS DIVISION CAMDEN NEW JERSEY Trademark s Registered Marca s Registrada s 3 0 3 J ...

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