Why is there no sound coming from my Icom IC-M602 Transceiver speaker?
Several factors could be at play. The squelch level might be too high; try setting it to the threshold point. Alternatively, the volume level may be too low, so adjust the [VOL] to a suitable level. If the speaker has been exposed to water, drain it. Finally, ensure the internal speaker is turned ON in set mode.
What to do if my Icom Transceiver won't transmit or use high power?
Some channels are designed for low power or receive-only operation, so try changing channels. Also, the output power might be set to low; push [H/L] to select high power.
How to fix low sensitivity on my Icom Transceiver?
The attenuator may be activated. Push [F], then [6 LO/DX] to turn the function OFF.
What to do if my Icom IC-M602 Transceiver distress call cannot be transmitted?
The MMSI (DSC self ID) code may not be programmed. Program the MMSI (DSC self ID) code.
Why Icom Transceiver receive signal cannot be understood?
The optional voice scrambler might be turned OFF, so turn it ON. Alternatively, the scramble code may not be set correctly; reset the scramble code.
How to fix Icom Transceiver when no power comes ON?
A bad connection to the power supply could be the reason. Check the connection to the transceiver.
Why are there no beep sounds on my Icom IC-M602?
The beep tone may be turned OFF, so turn it ON in set mode. Also, if the squelch is open, set it to the threshold point.
Describes service information for the IC-M602 transceiver.
Critical safety warnings to prevent equipment damage or personal injury.
Essential guidelines for safe repair and ordering replacement parts.
Overall technical specifications including frequency, modes, and power.
Performance specifications for transmitter and receiver sections.
Top views of the main unit and logic board with component labels.
Top and bottom views of the HM-127 microphone with component labels.
Steps to open the transceiver case by removing screws.
Procedures for removing the main, logic, and AF units.
Explanation of receiver circuit functions and stages.
Explanation of transmitter circuit functions and stages.
Descriptions of PLL, logic, DSC, and power supply circuits.
Required test equipment and connection setup for adjustments.
Procedures for adjusting PLL lock voltage and receiver sensitivity.
Parts list for the IC-M602 unit, including boards.
Parts lists for the HM-136 and HM-127 microphone accessories.
Lists chassis, unit, and board mechanical parts for IC-M602.
Lists mechanical parts for the HM-136 and HM-127 microphones.
Diagrams and identification of transistors and FETs used.
Diagrams and identification of diodes used.
Visual layouts for VR, SQL, and Dial boards.
Top and bottom views of the Connect Unit board.
Top and bottom views of the Logic unit board.
Top and bottom views of the Main unit board.
Top and bottom views of the AF unit board.
Top and bottom views for HM-136 and HM-127 circuit boards.
Overall functional block diagram of the transceiver system.
Diagrams showing wiring, voltage, and connections between units.
General| Type | Marine VHF Transceiver |
|---|---|
| Frequency Range | 156.000 - 163.425 MHz |
| Antenna Impedance | 50Ω |
| Weight | 1.5 kg |
| Waterproof Rating | IPX7 |
| Modulation System | FM |
| Sensitivity | 0.25 μV (12 dB SINAD) |
| Intermodulation Rejection Ratio | 70 dB |
| Spurious Response Rejection Ratio | 70 dB |
| Audio Output Impedance | 4Ω |
| Output Power | 25W / 1W |
| Power Supply | 13.8 V DC |
| Operating Temperature Range | -15°C to +55°C |
| Adjacent Channel Power | 70 dB |
| FM Hum and Noise | 40 dB |
| Squelch Sensitivity | 0.25 μV |
| Usable Channels | USA, Canada, International |
| Type of Emission | 16K0G3E (FM), 16K0G2B (DSC) |
| Current Drain | 5.5 A (at 25 W), 1.5 A (at 1 W) |
| Spurious Emissions | -70 dBc (High), -60 dBc (Low) |
To Next Page
