Radio Shack Trc 465 Pdf Manual

21-1579 OWNER’S MANUAL 40-Channel CB Base Station Transceiver Please read before using this equipment. TRC-4.fm Page 1 Thursday, August 5, 1999 9:34 AM.

• TRC-447 40-CHANNEL MOBILE CB WITH WX ALERT Catalog Number: 21-1576 CONTENTS Page Specifications..2 Block Diagram..5 Alignment and Adjustment..6 Troubleshooting..10 Wiring Diagram..16 Printed Circuit Boards..17 Exploded View and Disassembly Instructions..20 Mechanical Parts List.. • SPECIFICATIONS GENERAL Channels: 40 (CB Transceiver) 7 (Digital Weather Alert Radio) Frequency range: 26.965 MHz to 27.405 MHz (CB) 162.400 MHz to 162.550 MHz (WX) Frequency control: PLL controlled synthesizer Microphone: Electret condenser type microphone with channel up/down switch Antenna impedance: 50-ohm Controls: Volume control with Power on/off Switch. • CB TRANSMITTER PORTION Item Unit Nominal Limit ±200 ±1300 Frequency tolerance 25 °C 13.8 V − RF Power output AMC range 50% to 100% modulation −3 −10 Modulation frequency response Lower frequency 450 Hz −3 −10 Upper frequency 2500 Hz Microphone sensitivity 1 kHz, 50% Mod. • CHANNEL FREQUENCY OF PLL SYNTHESIZER CB BAND WX/ALERT BAND Antenna TX VCO RX VCO Antenna Frequency Frequency Frequency Frequency Frequency (MHz) (MHz) (MHz) (MHz) (MHz) 26.965 26.965 16.270 162.400 151.705 26.975 26.975 16.280 162.425 151.730 26.985 26.985 16.290 162.450 151.755 27.005 27.005 16.310.

• BLOCK DIAGRAM — 5 —. • ALIGNMENT AND ADJUSTMENT ALIGNMENT OF PLL Test Equipment Required and Connections • DC power supply: 13.8 V • DC voltmeter • Dummy load (50-ohm) Dummy Load (50-ohm) And Attenuator DC Voltmeter J501 JACK J751 Alignment Procedure Step Preset to Adjustment Remarks TX 40 CH L301. • ALIGNMENT OF TRANSMITTER SECTION Test Equipment Required and Connections • DC power supply: 13.8 V • Modulation meter • AF oscillator • RF power meter • Dummy load (50-ohm) & attenuator Dummy Load (50-ohm) AF Oscillator RF Power Meter And Attenuator Modulation Meter Transceiver 10 F. • ALIGNMENT OF RECEIVER SECTION Test Equipment Required and Connections • DC power supply: 13.8 V • AC voltmeter • Dummy load (8-ohm, 5 W resistive) • Signal generator (SG) (27.205 MHz, 1 kHz, 30% AM modulation, output inpedance 50-ohm): CB (162.45 MHz, 1 kHz, ±3kHz Dev. • Alignment Point Locations (Main PCB) FUSE 13.8v(RED) GND(BLK) DC CORD J501 DC JACK J502 L7 L1 L103 RT101 — 9 —. • TROUBLESHOOTING SYSTEM CONTROL SECTION CLOCK Unit will not tum on Power ON Check the Fuse. Replace Fuse.

Check the voltage of IC502. Check the power Replace IC502. Is display normal?

Check the voltage Replace IC502. Check the oscillation at pin 26 of IC401. • AUDIO SECTION sound Check if speaker wiring is Replace or resolder. Connected properly.

Check if volume, squelch controls are adjusted properly. Check volume and Replace wire or resolder. Wire connections. Adjust volume and squelch control. Mount blade 1.011 serial key free. Check IC501 Replace IC501 AF power IC AF power IC and Q10.

• PLL CIRCUIT CB No good Check whether there is RF voltage at R58 (L7 side). Check whether there is RF voltage at pin11 of IC301. Check whether there is approx. 2.3 V at CH1 (RX) and Defective R10, L101, C152 3.8 V at CH40 (TX) at TP3.

• PLL CIRCUIT WX No good Check the voltage of TP4 approx. 1 to 4V at CH1~7. Check the voltage Defective Vcc line at R316 reading at pin 15 of or D303. IC301 is approx. Check if there is RF Defective xtal X301 or poor voltage at pin 16 soldering. • RX SECTION CHECK Does not receive. Check ANT jack.

Replace J501. If C If WX/Digital SAME.

RF GAIN VOL MAX. Replace Check the voltage D201. Check whether there is RF See PLL section. Voltage at TP7 and 2nd Local. Check the voltage of TP4 1 to 4V See PLL section. • TX SECTION CHECK Does not transmit Defective or bad contact in Check the CB/WX antenna connector, or defective switch and the CB/WX switch.