Realistic TRC-9A / TRC-11
Contents
1. modulation winding F Defective resistor R57 or R59 G Faulty transistor Q6 or Q7 6 Squelch control does not operate A Defective transistor Q7 B Faulty VR2 or R34 SUB P C BOARD WIRING DIAGRAM TOP VIEW BOTTOM VIEW FOR CANADIAN D O C MODELS ONLY SUB P C BOARD NOTE Modulation limiting stage for Canadian model TRC 9A and TRC 11 Yellow Black Ref No Description RS Parts Number MFR s Parts Number Channel switch Knob TRC 11 only K 1074 GE 18D 4433 Lamp 1 Pilot Lamp 7V 50mA L 190mm L 0263 Lamp 2 Channel indicator lamp TRC 11 only L 0263 7V 50mA L 190mm Lamp Jewel HB 0706 GE 17D 3438 Lamp Holder TRC 11 only LH 141 Fuse 2A P C Board X 4269 GE 18C 4305 J1 Antenna jack connector J 6244 SO 239 273 J2 Speaker Jack J 0592 JA C 011 SPK Speaker S 4335 P0642AA Line cord strain relief HB 0705 SR 3P 4 Rubber bushing GE 15D 2699 Rubber bushing New type GE 19D 4607 SUB P C BOARD PARTS LIST Modulation limiting stage for Canadian model TRC 9A and TRC 11 Ref No Description RS Parts Number MFR s Parts Number CAPACITORS C62 C63 C64 Electrolytic 4 7 AF 16WV Ceramic 0 001 F Ceramic 0 04 F CE04W IC470B MC 60 MC 100 RESISTORS R66 69 R67 R68 Carbon film 10KS2 1 4W 5 Carbon film 47K2 1 4W 5 Carbon film 1K2 1 4W 5 ELR 1 4 103J ELR 1 4 473J ELR 1 4 102J SEMICONDUCTORS Q15 D10 Transistor Silicon Toshiba Diode Silico2. NL VOL SQ SQ Q10 AF POWER Q6 Q8 Q9 MIC MIC AMP AF AF Q11 AF POWER TRC 9A and TRC 11 WIRING DIAGRAM Note 6 crystal sockets with lead wires wires color BRN RED and ORG are TRC 9A 5 P C BOARD TOP VIEW 1 R64 is used for TRC 11 only 2 Crystal socket D E and F used for TRC 11 only P C BOARD BOTTOM VIEW TROUBLE SHOOTING Symptom Possible cause 1 Pilot lamp and channel indicator TRC 11 only lamps do not light and set does not operate when power is on A Faulty power cord B Defective power switch SW2 C 2A fuse blown 2 Fuse blows when power switch is on A Defective Electrolytic capacitor B Defective audio power amplifier transistor Q10 or Q11 C Defective TX final Transistor Q14 or Q13 D Defective zener diode D7 3 Pilot lamp or channel indicator lamp TRC 11 only does not light A Defective pilot lamp or resistor R63 B TRC 11 only Defective channel indicator lamp or resistor R64 C Short circuit in the B Circuit 4 Pilot lamp comes on but no sound on any channel A Faulty EXT Speaker jack J2 B Poor crystal socket contact or crystal loose in socket C Defective zener diode D5 D Weak crystal 5 Transmitter does not operate or no modulation A Faulty P T T switch B Defective microphone cartridge C Faulty transistor Q12 13 or Q14 D Faulty microphone cord E Defective T8 Transformer
3. Service Manual TRC 9A 1 1 3 CHANNEL 6 CHANNEL C B MOBILE TRANSCEIVER Catalog Number 21 139 141 CUSTOM MANUFACTURED FOR RADIO SHACK A TANDY CORPORATION COMPANY CONTENTS Page 1 SPECIFICATIONS 1 2 CRYSTAL LOCATIONS 1 3 CHASSIS DISASSEMBLY 2 4 GENERAL ALIGNMENT INSTRUCTIONS 3 4 5 ALIGNMENT POSITION 4 6 BLOCK DIAGRAM 5 7 WIRING DIAGRAM 5 8 P C BOARD TOP VIEW 6 9 P C BOARD BOTTOM VIEW 6 10 TROUBLE SHOOTING 7 11 PARTS LIST 8 12 12 SUB P C BOARD 12 13 SUB P C BOARD PARTS LIST 13 14 SEMICONDUCTOR LEAD IDENTIFICATION 13 15 SCHEMATIC DIAGRAM FOR SUB P C BOARD 13 16 SCHEMATIC DIAGRAM TRC 9A 14 17 SCHEMATIC DIAGRAM TRC 11 15 TRC 9A TRC 11 SPECIFICATIONS Description Nominal spec Limit spec Frequency range 26 965 27 255 MHz Channels 3 channels TRC 9A 21 139 6 channels TRC 11 21 141 Frequency tolerance Less than 0 005 Operating voltage 13 8VDC 10 Sensitivity 0 70 at 10 dB 1 50 at 10 dB Selectivity 33 dB at 10 kHz 30 dB at 10 KHz Intermediate frequency 455 kHz with ceramic filter Signal to noise ratio More than 40 dB at 1mV input Squelch sensitivity Threshold less than 1AV Tight 50AV 3mV Tight 5000 Audio output 1 2 watts More than 0 8 watt Max power 10 distortion More than 0 65 watt 1 watt RF output 3 watts 2 5 watts Power input 5 watts max Modulation Below 100 Antenna i
4. evel SQ Control Fully clockwise V T V M Parallel with 8 ohm dummy load or across speaker to J2 Signal generator to J1 Freq 27 065MHz TRC 9A 27 085MHz TRC 11 Mod 1kHz 30 Output 500 V R34 Adjust so squelch just opens TRANSMITTING SECTION ALIGNMENT CHART STEP CONTROL SETTING TEST EQUIPMENT CONNECTION TEST EQUIPMENT SETTING ADJUST REMARKS 1 CH A position 27 065MHz TRC 9A 27 085MHz TRC 11 Power meter 50 ohms to J1 1A ammeter in series with lead between modulation winding of T8 and collector of Q14 Oscilloscope in parallel with power meter Supply voltage 13 8 volts 2 Press the P T T SW II T9 10 Max power output 3 L5 6 Peak on the Power meter and dip on the ammeter to get 3 watts output at J1 or max output 4 Power meter 50 ohms to J1 1 A ammeter in series with lead between modulation winding of T8 and collector of Q14 Vary supply voltage from 15 to 12 volts T9 If no output adjust T 9 to assure output at both voltage extremes 5 Audio frequency generator to C23 or talk into Microphone Reset the supply voltage to 13 8 volts Check modulation 6 Repeat steps 2 to 4 ALIGNMENT POSITION 1 fl 9 T7 4 TX XTAL Q12 TX OSC Q13 DRIVER Q14 FINAL BLOCK DIAGRAM ANT Q1 RF RX XTAL Q2 MIX Q5 RX OSC Q3 1st IF Q7 Q4 2nd IF D3 D4 DET A
5. mpedance 50 ohms unbalanced Speaker impedance 8 ohms 2 1 4 Dynamic type Dimensions 4 1 4 W x 6 1 2 D x 1 3 4 H CRYSTAL LOCATIONS 1 CHASSIS DISASSEMBLY Removal of the cavinet Step 1 Remove 2 mounting braCket screws A as shown and remove the mounting bracket Step 2 Remove 2 screws B as shown from the rear Step 3 Pull out the chassis from the front GENERAL ALIGNMENT INSTRUCTIONS Test equipment required 1 RF standard signal generator S S G 2 AF signal generator 3 V T V M 4 RF power meter 5 Oscilloscope 6 Monitor receiver 7 Frequency counter 8 1A DC ammeter 9 8 ohm dummy load Note Keep the input signal from S S G as low as possible during all alignment RECEIVING SECTION ALIGNMENT CHART STEP CONTROL SETTING TEST EQUIPMENT CONNECTION SIGNAL GENERATOR SETTING ADJUST REMARKS 1 Volume control Fully clockwise SQ control Max counter clockwise CH A position 27 065 MHz TRC 9A 27 085 MHz TRC 11 V T V M Parallel with 8 ohm dummy load connected to J2 Signal generator through 100 pF to the base of Q2 2SC371 Freq 455 kHz Mod 1 kHz 30 T3 YEL T4 WHT T5 B LK Max output on voltmeter 2 fl V T V M Parallel with 8 ohm dummy load connected to J2 Signal generator to J1 Freq 27 065MHz TRC 9A 27 085MHz TRC 11 Mod 1 kHz T1 2 Max output on voltmeter 3 Volume control Adjust for desired audio l
6. n 2SC373 1N60 MISCELLANEOUS P C Board GE 19D 4788 1 SW1a b CHANNEL SW 2 SW2 POWER SW W VR1 3 RESISTANCE VALUES IN OHMS K 1000 4 CAPACITANCE VALUES IN MF P MMF 5 VOLTAGES ARE MEASURED WITH V T V M UNDER FOLLOWING CONDITIONS VOLUME MINIMUM SQUELCH MAXCLOCKWISE TRC 9A CAT No 21 139 NOTE 1 SW1a b CHANNEL SW 2 SW2 POWER SW W VR1 VOL CONT 3 RESISTANCE VALUES IN OHMS unless otherwise indicated K 1000 4 CAPACITANCE VALUES IN MF unless otherwise indicated P MMF 5 VOLTAGES ARE MEASURED WITH V T V M UNDER FOLLOWING CONDITIONS VOLUME MINIMUM SQUELCH MAX CLOCKWISE TRC 11 CAT No 24 141 RADIO SHACK Q A TANDY CORPORATION COMPANY U S A FORT WORTH TEXAS 76107 CANADA BARRIE ONTARIO CANADA L4M 4W5 TANDY CORPORATION AUSTRALIA BELGIUM 280 316 VICTORIA ROAD PARC INDUSTRIEL DE NANINNE BILSTON ROAD RYDALMERE N S W 2116 5140 NANINNE WEONESBURY STAFFS WF10 7JN 6A4 4000 Printed in Japan U K
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