The Icom IC-M55 maintenance manual provides detailed instructions for setting up, operating, and troubleshooting the VHF marine radiotelephone, covering various model versions including U.S.A., Europe, France, and U.K. It includes sections on control functions, circuit descriptions, mechanical parts disassembly, maintenance, adjustments, and specifications to assist users in effectively managing and servicing the device.
Manual Overview
The Icom IC-M55 VHF Marine Radiotelephone Maintenance Manual provides comprehensive guidance for servicing and troubleshooting the device. It includes detailed troubleshooting flows and error code diagnostics to assist technicians in identifying and resolving issues efficiently. Calibration and adjustment procedures are outlined for critical components such as the phase-locked loop (PLL), transmitter, and receiver circuits, ensuring optimal performance. The manual also offers board-level guidance, with specific sections dedicated to the main, audio, and logic units, including disassembly instructions and board layouts. Technicians can refer to circuit diagrams and voltage charts for in-depth analysis and repair. The manual covers various models, including U.S.A., Europe, France, and U.K. versions, with specific operational and programming instructions for each. It emphasizes the importance of proper maintenance and adjustment preparation, providing step-by-step instructions for voltage regulator checks and other essential procedures. This manual is an essential resource for maintaining the IC-M55’s reliability and functionality in marine communication applications.
Quick Issues Covered
- Diagnose power-up failures with voltage regulator checks.
- Calibrate transmitter using detailed adjustment procedures.
- Trace circuits with comprehensive schematic diagrams.
Overview
The IC-M55 is a VHF Marine transceiver designed and built by ICOM Incorporated for marine applications. The maintenance manual covers four different versions of the IC-M55: U.S.A., Europe, France, and U.K. It includes sections on specifications, control functions, operation, circuit descriptions, mechanical parts, maintenance and adjustment, board layouts, circuit diagrams, voltage charts, parts list, frequency charts, and options.
Specifications
- Number of channels: All marine channels
- Memory channels: 10 channels plus 10 weather channels
- Mode of operation: F3E 16KO (16F3), Simplex, semi-duplex
- Frequency stability: 0.001%
- Antenna impedance: 50 ohms unbalanced
- Power supply requirement: DC 13.8V + 15% (negative ground)
- Usable temperature range: ~—20°C ~ +60°C (+14°F ~ +140°F)
- Dimensions: 50.5mm(H) x 140mm(W) x 163mm(D)
- Weight: 1.3kg
- RECEIVER
- Frequency range: 156 ~ 163MHz
- Receiving system: Double superheterodyne
- Intermediate frequencies: 1st IF 21.4MHz, 2nd IF 455kHz
- Sensitivity: Less than 0.3uV for 12dB SINAD
- Selectivity: ~70dB at 25kHz (EfA SINAD)
- Spurious & image rejection: 75dB
- Threshold squelch sensitivity: 0.4uV
- Tight squelch sensitivity: 0.6uV
- Audio output: 3W to a 4 ohm speaker at 10% distortion
- Current drain: Maximum 0.65A (LCD light ON), Standby 0.18A (LCD light OFF)
- TRANSMITTER
- Frequency range: 156 ~ 157.5MHz
- RF power output: High 25W, Low 1W
- Maximum deviation: ±5kHz
- Spurious emissions: 70dB below carrier
- Harmonic emissions: 60dB below carrier
- Audio frequency response: +1,~—3dB of 6dB/octave pre-emphasis characteristic from 300 to 3000Hz with a 1000Hz reference
- Audio distortion: Less than 7% at 1000Hz for ±3kHz deviation
- Microphone impedance: 600 ohms
- Current drain: Maximum 5.5A (High power, LCD light ON), Minimum 1.3A (Low power, LCD light OFF)
Controls & Indicators
The front-panel controls and indicators for the VHF Marine Radiotelephone IC-M55 include:
1. RF POWER/USA SWITCH
2. Wx/MR SWITCH
3. CHANNEL AND FUNCTION DISPLAY
4. DIAL/SCAN SWITCH
5. CHANNEL 16/LOCK-OUT SCAN SWITCH
6. TX/SCAN USA WX DUAL/LOW LIKIA
7. CHANNEL SELECTOR
8. MIC CONNECTOR
9. FUNCTION SWITCH
10. SQUELCH CONTROL
11. VOLUME CONTROL/POWER SWITCH
12. DUAL WATCH/DIMMER SWITCH
Installation / Setup
Refer to the PDF for details.
Operation
Refer to the PDF for details.
Troubleshooting & Error Codes
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Safety & Warnings
Refer to the PDF for details.
Download MANUAL Service manual (PDF – 18.4 MB)
Icom IC-M55 service manual PDF for troubleshooting and calibrating the device. File size: 18.4 MB.
- Brand: Icom-ic-m55-service
- Model: MANUAL
- Type: Service manual
- File size: 18.4 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-M55 Service Manual Overview
The Icom IC-M55 is a professional-grade marine VHF transceiver designed for reliable communication on the water. This handheld radio provides clear voice transmission and reception, ensuring safety and coordination during marine activities. The service manual offers detailed instructions for maintenance, repair, and troubleshooting to keep the device operating at peak performance.
Main Features and Specifications
- Frequency Range: 156.000 to 162.025 MHz (marine VHF band)
- Output Power: 5 Watts (high), 1 Watt (low)
- Waterproof Design: IPX7 rated, submersible up to 1 meter for 30 minutes
- Large LCD Display with Backlight for easy readability
- 16 Marine Channel Presets including Channel 16 for distress calls
- Battery Life: Up to 12 hours of continuous use with NiMH rechargeable battery
- Emergency Scan and Dual Watch functions
Basic Usage and Operation Tips
To operate the IC-M55, power on the device and select the desired channel using the channel selector knob. Adjust the volume to a comfortable listening level. Press the Push-to-Talk (PTT) button to transmit your message clearly. Utilize the dual watch feature to monitor two channels simultaneously, enhancing situational awareness. Regularly charge the battery and store the radio in a dry place when not in use to maintain optimal performance.
Troubleshooting and Maintenance Notes
If you experience weak transmission or reception, first check the battery charge and antenna connection. Clean the microphone and speaker openings to prevent audio issues. For persistent problems, consult the service manual for detailed diagnostics and repair procedures. Periodically inspect the waterproof seals and replace them if damaged to maintain water resistance. Always use manufacturer-approved replacement parts to ensure device integrity.
Safety Reminder
Always operate the Icom IC-M55 in accordance with local marine communication regulations. Avoid transmitting on restricted channels unless authorized. Keep the device away from extreme heat or moisture when not in use, and never attempt repairs unless qualified, to prevent injury or further damage.