The Icom service manual for the IC-24AT/ET dual band FM transceiver provides detailed information on setup, operation, and troubleshooting, including specifications, circuit descriptions, mechanical parts, and adjustment procedures. It emphasizes safety precautions such as avoiding exposure to liquids and ensuring correct power connections to prevent damage to the transceiver.
Manual Overview
The Icom IC-24AT/ET Dual Band FM Transceiver service manual provides comprehensive guidance for troubleshooting, diagnostics, calibration, and board-level repairs. Troubleshooting begins with ensuring the transceiver is disconnected from power before disassembly, and problems should be confirmed as internal. Error diagnostics involve checking for incorrect power supply connections and ensuring RF signals do not exceed 20 dBm to avoid damage. Calibration procedures include PLL, receiver, and transmitter adjustments, requiring the use of insulated tuning tools and attenuators when connecting test equipment. The manual emphasizes careful handling of variable components to prevent damage. Board-level guidance is detailed in the board layouts section, covering units such as the logic, main, and various RF and PLL units. Each unit’s components, like the CPU and power modules, are identified for targeted repairs. The manual also includes voltage and block diagrams to assist in diagnostics and repairs. Proper part ordering is facilitated by providing specific order numbers and component details.
Quick Issues Covered
- Diagnose power-up failures with voltage diagram analysis.
- Adjust PLL circuits for frequency stability and accuracy.
- Trace circuits using detailed schematics for fault isolation.
Overview
The ICOM IC-24AT/ET is a dual-band FM transceiver service manual that provides detailed service information for the device. The manual covers various models with frequency ranges tailored to different regions, including the UK, Europe, Italy, the USA, Australia, and Asia. It includes safety warnings, ordering parts instructions, repair notes, and a comprehensive table of contents detailing sections on specifications, circuit descriptions, mechanical parts, disassembly, parts list, adjustment procedures, board layouts, block diagrams, and voltage diagrams. The manual is intended to assist in the servicing and maintenance of the transceiver.
Specifications
- Frequency coverage: VHF 144~148 MHz, UHF 430~450 MHz
- Mode: F3(FM)
- Tuning step: 5, 10, 12.5, 15, 25 or 50 kHz
- Memory channels: 40 plus 2 call channels
- Antenna impedance: 50 Ω unbalanced
- Power supply requirement: Icom battery packs or battery case (BP-81~BP-86, BP-90), External power jack 6~16 V DC
- Current drain (typical): High 1.3A (VHF), 1.6A (UHF); Low 1.05A (VHF), 0.7A (UHF); AF max. power 150 mA; Power saved 16 mA
- Usable temperature range: -10 °C ~ +60 °C
- Dimensions: 52 (W) X 156 (H) X 34.5 (D) mm (With the BP-86), 52 (W) X 136.5 (H) X 34.5 (D) mm (With the BP-82)
- Weight: 385g (With the BP-86 and dry batteries), 340g (With the BP-82)
- Output power (at 13.8 V DC): High 5W, Low1 0.5W, Low2 1.5W, Low3 3.5W
- Modulation system: Variable reactance frequency modulation
- Max. frequency deviation: ±5.0kHz
- Spurious emissions: Less than -60 dB
- Microphone impedance: 2kΩ
- Receiver system: Double-conversion superheterodyne
- Intermediate frequency: 1st 30.875 MHz, 2nd 455 kHz
- Sensitivity: Less than 0.18 μV for 12 dB SINAD
- Spurious response rejection: More than 60 dB
- Audio output power: More than 200 mW at 10 % distortion with an 8 Ω load
- Audio output impedance: 8Ω
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 16V. 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. 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 circuits 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 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 the equipment to the transceiver.
Download MANUAL Service manual (PDF – 13.9 MB)
Service manual for Icom IC-24ET/IC-24AT: troubleshoot, repair, and calibrate radio components. File size: 13.9 MB.
- Brand: Icom-ic-24et-ic-24at-service
- Model: MANUAL
- Type: Service manual
- File size: 13.9 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-24et-ic-24at-service MANUAL Overview
The Icom-ic-24et-ic-24at-service is a professional-grade communication device designed for reliable two-way radio communication. This manual provides detailed instructions for servicing and maintaining the Icom IC-24ET and IC-24AT models, ensuring optimal performance and longevity. Ideal for technicians and users alike, the service manual covers all aspects of device repair, calibration, and troubleshooting.
Main Features and Specifications
- Frequency Range: VHF/UHF bands suitable for various communication needs
- Power Output: High transmission power for clear signal over long distances
- Durable Construction: Rugged design for use in harsh environments
- Advanced Modulation: Supports FM modulation for clear audio quality
- Comprehensive Diagnostic Functions: Built-in self-test and error codes for easy troubleshooting
- Accessory Compatibility: Supports external microphones, speakers, and antennas
Basic Usage and Operation Tips
To operate the Icom IC-24ET/IC-24AT, first ensure the device is properly connected to a suitable antenna and power source. Use the channel selector to choose the desired frequency. Adjust the volume and squelch controls for optimal audio clarity. Always perform a radio check before use to confirm proper transmission and reception. Regularly update channel settings as per your communication requirements.
Troubleshooting and Maintenance Notes
If you experience poor audio quality or transmission issues, check antenna connections and verify power supply voltage. Refer to the diagnostic error codes in the manual to identify specific faults. Clean the device regularly to prevent dust accumulation, especially around connectors and controls. Replace worn or damaged cables promptly to maintain reliable operation. For complex repairs, follow the step-by-step service procedures outlined in this manual.
Safety Reminder
Always power off the device before performing any maintenance or repairs. Avoid exposing the radio to water or extreme temperatures. Use only manufacturer-approved accessories to prevent damage or safety hazards. When operating, maintain a safe distance from the antenna to reduce exposure to radio frequency energy. Follow all local regulations and guidelines for radio communication equipment usage.