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Realistic TRC-449, Service Manual

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Summary of Contents for TRC-449

Page 1: ...J EALIShc ervlce TRC 449 CB TRANSCEIVER Catalog Number 21 1562 CUSTOM MANUFACTURED FOR RADIO SHACK MADIVISION OF TANDY CORPORATION...

Page 2: ...COMPOUND PARTS INTERNAL DIAGRAMS 21 9 CHANNEL SWITCH P C BOARD FLEXIBLE 22 10 NOISE BLANKER P C BOARD 22 11 SPEAKER JACK P C BOARD TOP BOTTOM 22 12 MAIN P C BOARD TOP VIEW 23 13 MAIN P C BOARD BOTTOM...

Page 3: ...m Coaxial connector 600 ohm Dynamic Type 8 ohm 3 Watt 2 3 8 x 7 7 8 x 10 1 2 HWD 6 x 20 x 26 6 cm HWD 6 Ibs approx 2 65 kg DC Cord with in line Fuse Microphone and Microphone Hanger and Mounting Brack...

Page 4: ...No Modulation AM Image Rejection Ratio fo 2x7 8 MHz 1 2 IF Rejection Ratio fo 7 8 MHz 2 IF Rejection Ratio 7 8 MHz Oscillator Dropout Voltage Clarifier Range Spurious Rejection Ratio In band Out of Ba...

Page 5: ...Upper at 2 5 kHz EIA AM dB 6 10 5SB dB 6 10 Carrier Power Uniformity Ch to Ch at No Modulation AM W 0 3 0 4 Mic Input Level Uniformity Ch to Ch for 4 watts Output 25 kHz Single tone SSB dB 2 3 Mic Inp...

Page 6: ...gure 2 Figure 3 6 1 To remove Top Bottom Cover Figure 1 Remove 4 screws from each side and a screw from top SI ide the top toward the rear of the chassis and remove 2 To remove Front Panel Figure 2 Re...

Page 7: ...K DIAGRAM 9 I L u o D Z o t o I I I I L _________ __ _ I I I 1 r I i r r I R X T X I L_ I I I RX I SECT ION I J r I I I I I I I _ _ J I I ____ _ __ _1 _____ I J I L I I I I I I I I I ___________J SSB...

Page 8: ...NS CHASSIS LAYOUT ALIGNMENT POINTS L30 L27 J L32 0 0 0VR 6 J VRI5 VR8 L 3 LI en VRI2 0 ill J J J L4 VRI VR3 VR2 L37 LB CTI 0 L 5 VR5 l39 L7 VR4 L 24 vR 9 e 6 1 J CT6 0 Ll 7 0 VR6 CT5 ill 0 VR7 ill Ll6...

Page 9: ...Step 1 TP8 L16 Adjust for max output 4 Same as Step 1 TP8 CT6 Adjust to obtain 34 985 MHz 20 Hz on frequency Counter 5 RX USB CH19 TP8 CT4 Adjust to obtain 34 9875 MHz 20 Hz Clarifier in center posit...

Page 10: ...ies from 91 to 135 On the other hand a 10 24 MHz frequency from the Reference Oscillator is divided to 10kHz by 1 1024 Divider and applied to another input of the Phase Detector The Phase Detector det...

Page 11: ...llowing formula FL N x 10 kHz 3 x Fo 2 CHANNEL SELECTION PROGRAM The divide ratio N of the Programmable Frequen cy Divider is determined by supplied voltages to the program input terminals Pin No 13 t...

Page 12: ...975 34 9775 45 9725 19 27 185 113 1130 1 1 0 0 1 0 0 1 34 985 34 9875 34 9825 20 27 205 115 1150 1 0 1 0 1 0 0 1 35 005 35 0075 35 0025 21 27 215 116 1160 0 1 1 0 1 0 0 1 35 015 35 0175 35 0125 22 27...

Page 13: ...which feeds back the output amplifier lC4 into the limiter diode D21 D22 is provided The output of IC3 is subjected to impedance matching by the AF AMP TR20 through the low pass filter L10 L 11 and T...

Page 14: ...ned to 23 MHz IC1 ampl ifies the 23 MHz band of frequencies and L2 provides further tuning This signal is then amplified and detected utilizing he non I inear characteristic portion of the operating c...

Page 15: ...pproximately 40 mA reading Restore circuit Break circuit at TP2 place mA Meter in series Adjust for ap proximate y 15 mA reading Restore circuit Adjust for minimum carrier leakage for both USB and LSB...

Page 16: ...RF Generator Control Max VR 3 level to 1 mV SQUELCH Max ANL NB Off RX USB CH 19 6 Same as Step 1 RF Gain Control Max Volume SQUELCH Min Control ANL NB Off RX USB CH 19 7 Same as Step 1 RF Gain Control...

Page 17: ...ed you can as sume that RF thru IF stages are OK So checks shou Id be made on detector and AN L circuit D10 D11 and D12 NO TRANSMISSION 1 Broken or bad contact in microphone con nector and or push to...

Page 18: ...rrect then problems are with TR6 bias circuit or D6 C If the output of TR6 is produced properly check item D and E of NO TRANSMIT AM above NO AM MODULATION The signal in the modulation circuit flows t...

Page 19: ...38 or 39 open or poor soldering Defective IC6 and or 5V line Yes Defective TR40 or L24 or poor soldering Yes Defective Xtal5 and or IC7 or poor soldering Defective FET4 L19 open Yes Yes Check whether...

Page 20: ...J lPC78L05 IN COMMON CD OUT iFET 3 5 TLR 321 CD CD j IC 7 TR 1 TR 23 TR 26 TR 34 TR 37 TR 42 TR 45 TR 601 d b I d I 12313141516 6789101112 I b b r I I I DIGIT 1 DIGIT 2 12345678 c e d d2 e2 C2 ANODE...

Page 21: ...L DIAGRAMS IC PC577H IC 2 MC1496N IC 3 PC592H2 IC 6 JPC78L05 IC 4 PC 56H IC 5 UHIC005 1 Output Common IC 7 JPD858C 9 10 8 7 61 51 11 2 3 41 kL1 0 u u ooW I REF I I osc I I I FILTER I AMP I J i t CC CC...

Page 22: ...9 CHANNEL SVVITCH P C BOARD FLEXIBLE 10 NOISE BLANKER P C BOARD 11 SPEAKER JACK P C BOARD TOP VIEW BOTTOM VI EW 22...

Page 23: ...12 MAIN P C BOARD TOP VIEVV 23...

Page 24: ...13 MAIN P C BOARD BOTTOM VIEVV 24...

Page 25: ...14 ADDITIONAL PARTS ON THE BOTTOM 25...

Page 26: ...15 VVIRING DIAGRAM 26...

Page 27: ...C a C c z a co BLACK BlK REO REO YEll OW YEl GRAY GRY WHITE WHT BROWN BRN ORANGE ORG GREEN GRN BLUE BlU S SPIRAL REO 5 1 REO 5 110 REAR 0403 lR072R 0404 lR072R C ID fI ID FRONT N I...

Page 28: ...GAIN VR402 RV282 lOOK B a c CRARIFIER VR401 1tV196 20K B 2 a I t S405 SW076 WI22 VIO S MT401 WHT BlK PNK WHT 3 340 5 SP I RAl BROWN REO ORANGE YEllOW GREEN BLUE VIOLET GRAY WHITE BLACK PINK ANT CO N...

Page 29: ...citor 0 039J LF 50V K COMZ813935 C 26 Mylar Capacitor 0 039J LF 50V K COMZ813935 C 27 Mylar Capacitor 0 039J LF 50V K COMZ813935 C 28 Ceramic Capacitor 0 0241 F 50V Z ZF CKCZ812230 C 29 Mylar Capacito...

Page 30: ...22pF 50V K COMZ812235 C 84 Electrolytic Capacitor 1p F 50V Z CELZ 811090 C 85 Mylar Capacitor 0 039pF 50V K COMZ813935 C 86 Mylar Capacitor 0 022pF 50V K COMZ812235 C 87 Electrolytic Capacitor 2 2pF 2...

Page 31: ...apacitor 10pF 50V J CH CCCZ 811004 C 140 Tantalum Capacitor 10JlF 6 3V M CSEZ 901006 C 141 Tantalum Capacitor 10JlF 6 3V M CSEZ 901006 C 142 Ceramic Capacitor 68pF 50V J CH CCCZ 816804 C 143 Ceramic C...

Page 32: ...eramic Capacitor 0 01pF 50V K YB CKBZ811035 C 208 Ceramic Capacitor 0 01pF 50V K YB CKBZ811035 C 209 Ceramic Capacitor 0 01p F 50V K YB CKBZ811035 C 210 Mylar Capacitor 0 01pF 50V K COMZ811035 C 211 E...

Page 33: ...eramic Capacitor 39pF 50V J CH CCCZ 813904 C 605 50lid Aluminum Electrolytic Capacitor 0 1J l F 16V M CAAZ311086 C 606 Ceramic Capacitor 0 01J lF 50V K YB CKBZ811035 CT 1 Trimmer Capacitor 20pF CV 028...

Page 34: ...1 D 43 Varicap 152687D DX 0749 ODAY067001 D 44 Zener Diode CZ 092 9 2V DX 0087 DDAY010002 D 45 Varicap 152687D DX 0749 DOAY067001 D 46 Diode 152473 DDAY048014 D 47 Diode 1S2473 DDAY048014 D 50 Diode 1...

Page 35: ...0 Micro Inductor LZ 015 56mH or LZ 019 C 0788 LLZY 015022 L 11 Micro Inductor LZ 015 68mH or LZ 109 C 0789 LLZY 015023 L 12 Micro Inductor LZ 012 470tlH C 0787 LLZY 012004 L 13 Micro Inductor LZ 012 4...

Page 36: ...4 R 8 Carbon Film Resistor 1K ohm 1 8W J NEB 0196 RFPZ 181024 R 9 Carbon Film Resistor 4 7K ohm 1 8W J NEB 0247 RFPZ 184724 R 10 Carbon Film Resistor 2 7K ohm 1 8W J NEB 0224 RFPZ 182724 R 11 Carbon F...

Page 37: ...hm 1 8W J NEB 0281 RFPZ 181034 R 62 Carbon Film Resistor 270 ohm 1 8W J NEB 0230 RFPZ 182714 R 63 Carbon Film Resistor 56 ohm 1 8W J NEB 0107 RFPZ 185604 R 64 Carbon Film Resistor 10K ohm 1 8W J NEB 0...

Page 38: ...2 2K ohm 1 8W J NEB 0216 RFPZ 182224 R 121 Carbon Film Resistor 5 6K ohm 1 8W J NEB 0257 RFPZ 185624 R 122 Carbon Film Resistor 10K ohm 1 8W J NEB 0303 RFPZ 181034 R 123 Carbon Film Resistor 1K ohm 1...

Page 39: ...bon Film Resistor 15 ohm 1 8W J NEB 0074 RFPZ 181504 R 180 Metal Film Resistor 100 ohm lW K RSJZ 101015 R 181 Metal Film Resistor 100 ohm lW K RSJZ 101015 R 182 Carbon Film Resistor 10 ohm 1 8W J NEB...

Page 40: ...1 Transistor 2SC945A O DDBY224003 TR 2 Transistor 2SA733 P DDBY003001 TR 3 Transistor 2SC945A O DDBY224003 TR 4 Transistor 2SC945A O DDBY224003 TR 5 Transistor 2SC1730 L DDBY269001 TR 6 Transistor 2S...

Page 41: ...mi Fixed Resistor RV 189 20K ohm B P 6416 RRVY189006 VR 7 Semi Fixed Resistor RV 189 3K ohm B RRVY189010 VR 8 Semi Fixed Resistor RV 189 10K ohm B P 6415 RRVY189005 VR 9 Semi Fixed Resistor RV 189 5K...

Page 42: ...FPC JK 074 or JK 079 Connector for LED JK 073 001 Connector for LE D JK 073 003 Connector for LE D JK 073 005 P C Board Main PC 196BD Flexible P C Board CH Switch PC 212AA P C Board N B PC 244AA P C B...

Page 43: ...403877 20 Front Panel Z 3497 MDMP204343 21 Bracket Screw Mounting MDHP403997 22 Stud Noise Blanker PCB MDHP404350 23 Stud Main PCB MDHP404575 24 Control Trim Plate Z 3498 MDNP404341 25 Name Plate D 52...

Page 44: ...sistor SO DIM RRVY274001 65 Variable Resistor RF GAIN RRVY282001 66 Variable Resistor Clarifier RRVY196001 67 Variable Resistor VOL SW RRVY271001 68 Switch MON PA CB S 2378 SSWY076001 69 Switch NB OUT...

Page 45: ...MER TR MZSN192610 Screw M3x6 NB PCB MZSN193006 Screw M3x8 T402 SP MZSN193008 Screw 5 x 16 Bracket MZSZ235016 Screw M3x 6 Lug Terminal MZSZ343006 Screw M3x 5 Lamp Holder MZSZ343005 Nut M2 6 DIMMER TR M...

Page 46: ...U S A FORT WORTH TEXAS 76102 CANADA BARRIE ONTARIO L4M 4W5 TANDY CORPORATION AUSTRALIA BElGIUM U K 280 316 VICTORIA ROAD PARC INDUSTRIEl DE NANINNE BILSTON ROAD WEDNESBURY RYDAlMERE N S W 2116 5140 N...

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