The Icom service manual for the IC-W21A/E dual-band FM transceiver provides detailed instructions on setup, operation, and troubleshooting, including specifications, disassembly instructions, circuit descriptions, and adjustment procedures. It warns against connecting the transceiver to an AC outlet or a DC power supply exceeding 16 V, exposing it to liquids, reversing power supply polarities, and applying excessive RF signals to prevent damage.
Manual Overview
The Icom IC-W21A/E Dual Band FM Transceiver service manual provides detailed instructions for troubleshooting, diagnostics, calibration, and board-level repairs. For troubleshooting, it emphasizes verifying internal issues before disassembly and ensuring the transceiver is disconnected from power. It warns against reversing power supply polarities and applying excessive RF signals to prevent damage. Error diagnostics involve checking connections and using insulated tools for adjustments. Calibration procedures include PLL and transmitter adjustments, requiring specific test equipment like deviation meters and spectrum analyzers with attenuators. The manual outlines board layouts for the logic, VHF, and UHF units, providing guidance on component locations and connections. It stresses the importance of using the correct order numbers and component names when replacing parts. The manual also includes voltage diagrams and block diagrams for further technical insights, ensuring technicians can effectively maintain and repair the transceiver.
Quick Issues Covered
- Diagnose power-up failures due to incorrect DC voltage connections.
- Calibrate PLL circuits for optimal frequency stability and performance.
- Trace circuits using detailed schematics for logic and RF units.
Overview
This service manual provides detailed service information for the IC-W21A/E Dual Band FM Transceiver. It includes specifications, disassembly instructions, circuit descriptions, adjustment procedures, parts lists, and more. The manual covers various model versions for different regions, such as the USA, Australia, Asia, Europe, the UK, Italy, and Denmark. It also provides safety warnings and guidelines for handling and servicing the transceiver.
Specifications
- Frequency coverage
- Mode: F3E (FM)
- Antenna impedance: 50 Q (nominal)
- Usable temperature range: —10°C to +60°C
- Frequency stability: +5 ppm
- External DC power supply: 6-16 V DC
- Current drain (Typical): Transmit High 1.3A, Low 500 mA, Receive Rated audio output 150 mA
- Dimensions: 57 (W) x 125 (H) x 35 (D) mm
- Weight: 390 g
- Sensitivity: Less than 0.16 pV for 12 dB SINAD
- Receive system: Double-conversion superheterodyne
- Intermediate frequencies: VHF; 1st 43.100 MHz, 2nd 455 kHz
- Selectivity: More than 15 kHz/ —6 dB, less than 30 kHz/-60 dB
- Audio output power: More than 0.2 W
- Spurious rejection: More than 60 dB
- Output power: 5 W (HIGH), 3.5 W (LOW3), 1.5 W (LOW2), 0.5 W (LOW1), 0.015 W (ELOW)
- Modulation system: Variable reactance frequency modulation
- Max. frequency deviation: +5kHz
- Spurious emissions: Less than -60 dB
- Microphone impedance: 2kQ
Controls & Indicators
Refer to the PDF for details.
Installation / Setup
Refer to the PDF for details.
Operation
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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. 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 of 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 40 dB — 50 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 – 4.1 MB)
Icom IC-W21AT/IC-W21ET service manual PDF for troubleshooting and repair guidance. File size: 4.1 MB.
- Brand: Icom-ic-w21at-ic-w21et-service
- Model: MANUAL
- Type: Service manual
- File size: 4.1 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-W21AT / IC-W21ET Service Manual Overview
The Icom IC-W21AT and IC-W21ET are compact, handheld transceivers designed for reliable two-way communication in various environments. Widely used by outdoor enthusiasts, emergency responders, and professionals, these radios provide clear voice transmission and durable performance. This service manual offers detailed guidance on maintenance, repair, and operation to ensure optimal functionality of the devices.
Main Features and Specifications
- Frequency Range: VHF 144–148 MHz (IC-W21AT), UHF 430–440 MHz (IC-W21ET)
- Power Output: Up to 5 Watts for strong signal transmission
- 16 Programmable Channels with Channel Scan function
- Compact and lightweight design for easy portability
- Built-in CTCSS and DCS for selective calling and privacy
- Battery Life: Approximately 10 hours with standard NiMH battery pack
- Durable construction with water-resistant casing
Basic Usage and Operation Tips
To operate the IC-W21AT/ET, first ensure the battery is fully charged and properly installed. Select the desired channel using the channel selector knob. Press and hold the Push-to-Talk (PTT) button to transmit your voice, and release it to listen. Use the volume control to adjust audio levels. For privacy, enable CTCSS or DCS tones matching your communication group. Regularly scan channels to monitor activity and switch as needed for clear communication.
Troubleshooting and Maintenance Notes
If you experience weak transmission or reception, check the antenna connection and battery charge level. Clean the battery contacts periodically to maintain good electrical contact. In case of audio distortion, verify volume settings and microphone condition. For persistent issues, refer to the service manual’s detailed diagnostic procedures. Avoid exposing the radio to extreme temperatures or moisture to prolong its lifespan.
Safety Reminder
Always use the Icom IC-W21AT/ET radios in accordance with local regulations and licensing requirements. Do not operate the radio while driving or performing activities that require full attention. Keep the device away from explosive environments and avoid disassembling it unless qualified to do so. Proper handling and maintenance ensure safe and reliable operation.