The Icom IC-R20 service manual provides detailed instructions for setting up, operating, and troubleshooting the communications receiver, including information on disassembly, circuit descriptions, and adjustment procedures. It emphasizes safety precautions such as avoiding exposure to liquids and ensuring correct power supply connections to prevent damage to the receiver.
Manual Overview
The Icom IC-R20 Communications Receiver service manual provides detailed technical guidance for servicing the device. It includes troubleshooting flows, error codes, and diagnostics to assist technicians in identifying and resolving issues. Calibration and adjustment procedures are outlined, emphasizing the use of insulated tools and careful handling to avoid damage. The manual advises against connecting the receiver to power sources exceeding 6.3 V and warns about potential damage from RF signals over 20 dBm. It includes board-level guidance with sections on RF, logic, and various VCO boards, providing circuit descriptions and layouts. The manual also covers the disassembly process, ensuring technicians can safely access internal components. For diagnostics, voltage diagrams and block diagrams are provided to facilitate understanding of the receiver’s operation. The manual emphasizes the importance of verifying internal issues before disassembly and advises on proper power management during repairs. Additionally, it includes specifications for the receiver and its components, ensuring technicians have all necessary information for effective servicing.
Quick Issues Covered
- Diagnose power-up failures due to incorrect voltage supply.
- Calibrate using software adjustments for optimal receiver performance.
- Trace circuits with detailed schematics for RF and logic units.
Overview
The IC-R20 is a communications receiver manufactured by Icom Inc. The service manual provides detailed service information for the IC-R20, covering various versions of the model. It includes specifications, inside views, disassembly instructions, circuit descriptions, adjustment procedures, parts lists, mechanical parts and disassembly, semiconductor information, board layouts, block diagrams, voltage diagrams, and information on the BC-156 battery charger unit. The manual also outlines safety precautions and repair notes for servicing the receiver.
Specifications
- Receiver system: Triple super heterodyne and down convertor
- Frequency coverage: [EUR], [UK], [SEA], [CAN] 0.150-3304.999; [EXP-01], [EXP-02] 0.150-821.999, 851.000-866.999, 896.000-1304.999, 1305.000-3304.999; [USA] 0.150-29.999, 50.200-51.200, 87.500-108.000, 144.000-146.000, 430.000-440.000, 1240.000-1300.000
- Intermediate frequency: 1st 266.7 and 429.1 MHz, 2nd 19.65 MHz, 3rd 450 kHz
- Mode: FM, WFM, AM, SSB, CW
- No. of memory channel: 1250 channel (incl. scan edge and auto memory write ch.)
- Frequency stability: ±6 ppm max.
- Tuning steps: 0.01, 0.1, 1, 5, 6.25, 8.33, 9, 10, 12.5, 15, 20, 25, 30, 50 and 100 kHz
- Antenna Impedance: 50Ω
- Power supply requirement: 3 X AA(R6) alkaline cells, BP-206 or external power supply (BC-149/A/D, CP-18)
- Polarity: Negative ground
- Current drain (at 3.7 V, backlight is OFF): Rated audio 150 mA typical, Standby 100 mA typical, Power saved 35 mA typical (Power save ratio is 1:4)
- Usable temperature range: -10°C to +60°C
- Dimensions: 58(W) x 142(H) x 34.8(D) mm; 2.28(W) x 5.59(H) x 1.37(D) in
- Weight (with antenna and BP-206): Approx. 320 g; 11.29 oz
- External SP connector: 3-conductor 3.5(d) mm (1/8”) / 8Ω
- Audio output power (at 3.7 V): 100 mW typical at 10 % distortion with an 8 Ω load
- BP-206 charging time: Approx. 8 hours
- Charging current: 400 mA typical
- Selectivity: SSB/CW More than 1.8 kHz / -6 dB, AM / FM More than 12 kHz / -6 dB, Less than 30 kHz / -60 dB, WFM More than 150 kHz / -6 dB
Controls & Indicators
Refer to the PDF for details.
Installation / Setup
Refer to the PDF for details.
Operation
Refer to the PDF for details.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
NEVER connect the receiver to an AC outlet or to an external DC power supply that uses more than 6.3 V. This will ruin the receiver. DO NOT expose the receiver to rain, snow or any liquids. DO NOT reverse the polarities of the power supply when connecting the receiver. DO NOT apply an RF signal of more than 20 dBm (100 mW) to the antenna connector. This could damage the receiver’s front end. Make sure a problem is internal before disassembling the receiver. DO NOT open the receiver until the receiver is disconnected from its power source. DO NOT force any of the variable components. Turn them slowly and smoothly. DO NOT short any circuits or electronic parts. An insulated turning tool MUST be used for all adjustments. DO NOT keep power ON for a long time when the receiver is defective. READ the instructions of test equipment thoroughly before connecting equipment to the receiver.
Download MANUAL Service manual (PDF – 4.6 MB)
Icom IC-R20 Service Manual PDF (4.6 MB) aids technicians in troubleshooting and calibrating the IC-R20 receiver.
- Brand: Icom-ic-r20-service
- Model: MANUAL
- Type: Service manual
- File size: 4.6 MB
Overview
Brief overview of the product.
Specifications
- Key spec 1
- Key spec 2
Controls & Indicators
Control panel/button layout.
Installation / Setup
- Step 1…
- Step 2…
Operation
Basic usage, modes, cycles.
Troubleshooting & Error Codes
| Issue / Code | Fix |
|---|---|
| Example | How to fix… |
Safety & Warnings
- Important warning…
Downloads
Download MANUAL service manual (PDF)
Icom IC-R20 Service Manual Overview
The Icom IC-R20 is a versatile handheld communications receiver designed for scanning and monitoring a wide range of radio frequencies. This device is ideal for amateur radio enthusiasts, emergency responders, and professionals who require reliable and precise signal reception. The IC-R20 supports various modulation types and offers extensive frequency coverage, making it a powerful tool for radio monitoring and communication tasks.
Main Features and Specifications
- Frequency Coverage: 0.15 MHz to 1309.995 MHz
- Modulation Types: AM, FM, WFM, and CW
- Memory Channels: 1000 channels with alpha tagging
- Scanning Modes: Programmed scan, priority scan, and memory scan
- Display: Large LCD with backlight for easy readability
- Battery Life: Up to 10 hours with rechargeable NiMH battery pack
- Connectivity: External speaker jack and data output for PC interface
Basic Usage and Operation Tips
To operate the IC-R20, first power on the device and select the desired frequency band using the band selector. Use the tuning knob or keypad to enter specific frequencies or scan through stored memory channels. Adjust the volume and squelch controls to optimize audio clarity. Utilize the scanning modes to efficiently monitor multiple channels or frequencies. Regularly update memory channels to keep your receiver tuned to relevant signals.
Troubleshooting and Maintenance
If the receiver experiences poor reception or intermittent audio, ensure the antenna is properly connected and positioned. Check battery levels and recharge if necessary. For persistent issues, reset the device to factory settings using the service menu. Clean the exterior and connectors periodically with a soft, dry cloth to prevent dust buildup. Avoid exposure to moisture or extreme temperatures to maintain optimal performance.
Safety Reminder
Always operate the Icom IC-R20 in accordance with local regulations and guidelines. Avoid using the device near high-voltage equipment or in explosive environments. Handle the battery pack carefully and use only recommended chargers to prevent damage or hazards. Keep the receiver out of reach of children and store it in a safe, dry place when not in use.