The Icom service manual for the IC-228A/E/H 144MHz FM Transceiver provides comprehensive information on the theoretical, physical, mechanical, and electrical characteristics necessary for setup, operation, and troubleshooting. It includes detailed instructions for disassembly, assembly, maintenance, and adjustment procedures, as well as guidelines for ordering replacement parts and ensuring proper equipment servicing.
Manual Overview
The Icom IC-228A/E/H 144MHz FM Transceiver service manual provides detailed guidance for servicing and maintaining the transceiver. It includes troubleshooting flows, error codes, and diagnostics to assist technicians in identifying and resolving issues. Calibration and adjustments are covered extensively, with specific instructions for PLL, receiver, and transmitter adjustments. The manual emphasizes the importance of using insulated tuning tools and following safety precautions, such as disconnecting the transceiver from power before opening covers and not exceeding a 15V power source. Board-level guidance is provided with detailed board layouts and circuit descriptions for the main and RX units. The manual also includes disassembly and assembly diagrams to aid in the repair process. For ordering replacement parts, it is crucial to provide the equipment model, serial number, schematic part identifier, component part number, and quantity required. The manual ensures technicians have the necessary information to effectively service the transceiver while maintaining safety and accuracy.
Quick Issues Covered
- Diagnose PLL circuit issues causing frequency instability.
- Error codes for power-up failures in IC-228A/E/H models.
- Schematics for circuit tracing and component identification.
Overview
The service manual provides comprehensive information on the IC-228A/E/H 144MHz FM Transceiver, covering theoretical, physical, mechanical, and electrical characteristics. It includes details on specifications, disassembly and assembly diagrams, maintenance and adjustment procedures, and parts lists. The manual also offers guidance on ordering replacement parts and seeking assistance from Icom dealers or service centers.
Specifications
- Frequency coverage
- Mode F3 (FM)
- Selectable tuning step: 5, 10, 15, 20 and 25kHz (U.S.A., Australia, Asia versions), 12.5 and 25kHz (Europe, Italy versions)
- Memory channels: 20 plus a call channel
- Antenna impedance: 50Ω
- Power supply requirement: 13.8V DC+15% (negative ground)
- Current drain (IC-228H) Receive: 450mA (standby), 800 mA (max. audio output), Transmit: 3.5A (LOW), 9.5A (HIGH)
- Current drain (IC-228A/E) Receive: 450mA (standby), 800 mA (max. audio output), Transmit: 3.0A (LOW), 6.0A (HIGH)
- Usable temperature range: -10°C ~ +60°C (+14°F ~ +140°F)
- Frequency stability: ±10ppm (-10°C ~ +60°C) (+14°F ~ +140°F)
- Dimensions IC-228H: 140(W) x 50(H) x 159(D) mm, 5.5(W) x 2.0(H) x 6.3(D) in.
- Dimensions IC-228A/E: 140(W) x 50(H) x 137(D) mm, 5.5(W) x 2.0(H) x 5.4(D) in. (Projections not included)
- Weight IC-228H: 1.1 kg (2.4 lb)
- Weight IC-228A/E: 0.85kg (1.9 lb)
- TRANSMITTER
- Output power IC-228H: 45W (HIGH), 5W (LOW)
- Output power IC-228A/E: 25W (HIGH), 5W (LOW)
- Modulation system: Variable reactance frequency modulation
- Max. frequency deviation: ±5kHz
- Spurious emissions: Less than -60dB
- Microphone impedance: 600Ω
- RECEIVER
- Receiver system: Double-conversion superheterodyne
- Intermediate frequencies: 1st 17.2MHz, 2nd 455kHz
- Sensitivity: 0.18μV for 12dB SINAD
- Selectivity: More than 15kHz/-6dB, Less than 30kHz/-60dB
- Audio output power: More than 2.4W at 10% distortion with an 8Ω load
- Audio output impedance: 8Ω
Controls & Indicators
The front panel of the IC-228A/E/H 144MHz FM Transceiver includes the following controls and indicators:
– VFO/MEMORY SWITCH [VFO/M]
– CALL CHANNEL SWITCH [CALL]
– RECEIVE INDICATOR [RX]
– TRANSMIT INDICATOR [TX]
– SQUELCH CONTROL/MONITOR SWITCH [SQL/MONITOR]
– POWER SWITCH/VOLUME CONTROL [ON/VOL]
– DUPLEX SWITCH [DUP]
– TONE SWITCH [T/T. SQL]
– MICROPHONE CONNECTOR
– TRANSMIT POWER SWITCH [HI/LO]
– PRIORITY SWITCH [PRIO]
– TUNING STEP SWITCH [TS]
– SET MODE SWITCH [SET]
– LOCK SWITCH [LOCK]
– MEMORY WRITE SWITCH [MW]
– MAIN TUNING DIAL
Installation / Setup
Refer to the PDF for details.
Operation
Refer to the PDF for details.
Troubleshooting & Error Codes
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Safety & Warnings
DO NOT open transceiver covers until the transceiver is disconnected from a power source. DO NOT connect the transceiver to an external power source of more than 15V. 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 20dB or 30dB 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 – 17.9 MB)
Icom IC-228A/E/H Service Manual PDF (17.9 MB) for troubleshooting, repair, and maintenance of radio communication devices.
- Brand: Icom-ic-228a-ic-228e-ic-228h-service
- Model: MANUAL
- Type: Service manual
- File size: 17.9 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-228A / IC-228E / IC-228H Service Manual Overview
The Icom IC-228A, IC-228E, and IC-228H are reliable VHF FM transceivers designed for amateur radio enthusiasts and professional communication use. These models provide clear, stable voice communication over VHF frequencies, making them ideal for both mobile and base station applications. The service manual offers detailed guidance on maintenance, repair, and technical specifications to ensure optimal performance and longevity of your device.
Main Features and Specifications
- Frequency Range: 144–148 MHz (VHF amateur band)
- Output Power: Up to 50 Watts (varies by model)
- Modulation: Frequency Modulation (FM)
- Channel Capacity: 200 memory channels
- Built-in CTCSS and DCS for privacy and selective calling
- Adjustable Squelch and RF Gain controls
- LCD display with channel and frequency readout
- Robust metal chassis for durability
Basic Usage and Operation Tips
To operate the Icom IC-228 series transceivers, first ensure the antenna is properly connected and the power supply matches the device requirements. Use the channel selector or keypad to choose the desired frequency or memory channel. Adjust the volume and squelch controls to optimize audio clarity and reduce background noise. When transmitting, press the push-to-talk (PTT) button firmly and speak clearly into the microphone. Release the PTT to receive incoming signals. Regularly update memory channels to keep communication efficient.
Troubleshooting and Maintenance Notes
If you experience weak transmission or reception, check antenna connections and inspect for any visible damage. Intermittent audio or no sound may indicate a faulty microphone or speaker, which should be tested or replaced as needed. Refer to the service manual for detailed circuit diagrams and alignment procedures. Regularly clean the exterior and connectors to prevent dust buildup. Avoid exposing the unit to moisture or extreme temperatures to maintain reliable operation.
Safety Reminder
Always disconnect the power supply before performing any maintenance or repairs to avoid electrical shock. Use only manufacturer-recommended replacement parts and accessories. Operate the transceiver in accordance with local regulations and licensing requirements. Ensure proper ventilation to prevent overheating and never modify the device beyond the specifications outlined in the service manual.