The Icom service manual for the IC-4SRA/E UHF FM transceivers provides detailed instructions on setup, operation, and troubleshooting, including specifications, circuit descriptions, adjustment procedures, and parts lists. It emphasizes safety precautions such as avoiding exposure to high voltage and liquids, and provides guidelines for ordering replacement parts and performing repairs.
Manual Overview
The Icom service manual for the IC-4SRA/E UHF FM Transceivers provides detailed technical guidance for troubleshooting, diagnostics, calibration, and board-level repairs. It emphasizes the importance of verifying internal issues before disassembly and ensuring the transceiver is disconnected from power sources to prevent damage. The manual includes a comprehensive troubleshooting flow, highlighting the need for insulated tuning tools during adjustments and the use of attenuators when connecting test equipment like deviation meters or spectrum analyzers. Error codes and diagnostics are not explicitly detailed, but the manual provides a structured approach to identifying and resolving issues through circuit descriptions and adjustment procedures. Calibration and adjustments are covered extensively, with specific sections dedicated to PLL, receiver, and transmitter adjustments. Board-level guidance is detailed in the board layout section, which includes diagrams and component locations for units such as the logic, UHF RF, and RX units. The manual also outlines the correct process for ordering replacement parts, ensuring technicians have the necessary information for efficient repairs.
Quick Issues Covered
- Diagnose power-up failures with voltage diagram references.
- Error codes for PLL adjustments and receiver calibration.
- Circuit tracing using detailed schematics for logic and RF units.
Overview
This service manual provides detailed service information for the IC-4SRA/E UHF FM Transceivers, covering models for various regions, including the USA, Australia, Asia, the UK, and Europe. It includes specifications, circuit descriptions, adjustment procedures, parts lists, mechanical parts and disassembly instructions, board layouts, optional units, voltage diagrams, and block diagrams. The manual also contains safety warnings and repair notes to ensure proper handling and servicing of the transceivers.
Specifications
- Current drain
- Transmit High Power 1.6A
- Low Power 700 mA
- Power saved 20 mA
- Rated audio output 170mA
- Rated audio output 250 mA
- External DC power supply : 6~16 V DC (negative ground)
- Usable temperature range : —10°C~+60°C; +14°F~+140°F
- Dimensions and weight
- VERSION DIMENSION WEIGHT
- 54 (W)x 170 (H)x36 (D) mm 500g
- 9 (W)x6.7 (H)x 1.4 (D) in 1.4Ib
- 54 (W)x135 (H)x36 (D) mm 385 g
- 2.1 (W)x5.3 (H)x 1.4 (D) in 13.6 0z
- 54 (W)x 154 (H) x36 (D) mm 430 9
- 2.1 (W)x6.1(H)x1.4(D)in 15.2022
- HAM BAND
- Frequency coverage
- MODEL VERSION FREQUENCY COVERAGE
- IC-4SRA U.S.A. 440~450 MHz
- IC-4SRA Australia 430~440 MHz
- Mode : FM
- Frequency stability : £5 ppm (0°C~+50°C; +32°F~+122°C)
- Antenna impedance : 50Q (nominal)
- Transmitter
- Output power (at 13.5 V) : 5W, 3.5 W, 1.5 W and 500 mw
- Max. frequency deviation : t5 kHz
- Spurious emissions : Less than —60 dB
- Receiver
- Receive system : Double-conversion superheterodyne
- Intermediate frequencies : 1st 35.800 MHz 2nd 455 kHz
- Sensitivity : Less than 0.16 pV for 12 dB SINAD
- Squelch sensitivity : Less than 0.18 UV at threshold
- Selectivity : More than 15 kHz/-—6 dB
- Less than 30 kHz/-—60 dB
- Spurious response rejection : More than 60 dB
- Audio output power : 180 mW at 10% distortion with an 8Q load.
- RECEIVER BAND
- Frequency coverage > 25~950 MHz
- Guaranteed frequency coverage is 50~905 MHz.
- Mode : AM, FM and WFM
- Receive system : Triple-conversion superheterodyne
- Intermediate frequencies > 1st 266.700 MHz, 2nd 10.700 MHz, 3rd 455 kHz
- Sensitivity (Typical) : AM; 1.8 pV for 10 dB S/N
- FM; 0.56 uV for 12 dB S/N
- WFM; 1.8 uV for 12 dB S/N
- Selectivity : AM, FM; More than 15 kHz/—6 dB
- WEM; More than 150 kHz/—6 dB
- Audio output power : 180 mW at 10% distortion with an 8Q load.
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 transceiver to an AC outlet or to a DC power supply that uses more than 16 V as this will ruin the transceiver. DO NOT expose the transceiver to rain, snow, or any liquids. DO NOT reverse the polarities of the power supply when connecting the transceiver. DO NOT apply an RF signal of more than 20 dBm (100 mW) to the antenna connector as this could damage the transceiver’s front end. Make sure a problem is internal before disassembling the transceiver. DO NOT open the transceiver until it is disconnected from its power source. DO NOT force any of the variable components; turn them slowly and smoothly. DO NOT short any circuit or electronic parts; an insulated tuning tool must be used for all adjustments. DO NOT keep power on for a long time when the transceiver is defective. DO NOT transmit power into a signal generator or a sweep generator. ALWAYS connect a 30 dB~40 dB attenuator between the transceiver and a deviation meter or spectrum analyzer when using such test equipment. READ the instructions of test equipment thoroughly before connecting equipment to the transceiver.
Download MANUAL Service manual (PDF – 22.7 MB)
Icom IC-4SRA/IC-4SRE Service Manual PDF (22.7 MB) for troubleshooting, calibrating, and repairing radio equipment efficiently.
- Brand: Icom-ic-4sra-ic-4sre-service
- Model: MANUAL
- Type: Service manual
- File size: 22.7 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-4sra-ic-4sre-service Manual Overview
The Icom IC-4SRA and IC-4SRE are professional-grade communication transceivers designed for reliable and clear two-way radio communication. These models are widely used in various industries including emergency services, construction, and event management, providing robust performance in challenging environments. The service manual offers detailed guidance on maintenance, repair, and operation to ensure optimal device functionality.
Main Features and Specifications
- Frequency Range: VHF/UHF bands suitable for diverse communication needs
- Power Output: Adjustable transmission power for extended range or battery conservation
- Durable Construction: Weather-resistant casing designed for outdoor and rugged use
- Clear Audio Quality: Noise reduction technology for enhanced voice clarity
- Multiple Channel Memory: Supports storing numerous preset channels for quick access
- Battery Life: Long-lasting rechargeable battery with efficient power management
- Accessory Compatibility: Supports external microphones, headsets, and antennas
Basic Usage and Operation Tips
To operate the IC-4SRA/IC-4SRE, start by fully charging the battery before use. Turn on the device using the power switch and select the desired channel via the channel selector knob. Press and hold the push-to-talk (PTT) button to transmit your message, and release it to listen. Adjust the volume control to a comfortable listening level. Regularly check and update the channel settings to match your communication requirements.
Troubleshooting and Maintenance Notes
If you experience poor audio quality or transmission issues, verify the antenna connection and ensure the battery is fully charged. Clean the device contacts periodically to prevent corrosion. For persistent problems, refer to the service manual’s diagnostic flowcharts. Avoid exposing the device to extreme temperatures or moisture, and perform routine inspections to identify any physical damage early.
Safety Reminder
Always follow safety guidelines when operating the IC-4SRA/IC-4SRE. Do not use the radio while driving or operating machinery to avoid distractions. Keep the device away from explosive environments and avoid modifying the unit, as this can compromise safety and void warranties. Proper handling and adherence to the manual’s instructions will ensure safe and effective communication.