How to fix Icom IC-M604 Transceiver voice scrambler if it is not operational?
If the voice scrambler on your Icom Transceiver is not operational, first turn the optional voice scrambler ON. If the issue persists, reset the scramble code.
What to do if the Icom Transceiver distress call cannot be transmitted?
If the distress call cannot be transmitted, it might be because the MMSI (DSC self ID) code is not programmed. Program the MMSI (DSC self ID) code to resolve this issue.
What to do if no sound comes from the Icom IC-M604 Transceiver speaker?
If no sound is coming from the speaker, consider the following possibilities: * The squelch level may be too high: set [SQL] to the threshold point. * The volume level may be too low: set [VOL] to a suitable level. * The speaker may have been exposed to water: drain water from the speaker. * The internal speaker may be turned OFF: turn the internal speaker ON in set mode.
What to do if the Icom Transceiver receive signal cannot be understood?
If the receive signal cannot be understood, the optional voice scrambler may be turned OFF, so turn it ON. Alternatively, the scramble code may not be set correctly, so reset the scramble code.
Why is the Icom IC-M604 transmitting impossible, or high power cannot be selected?
If transmitting is impossible, or high power cannot be selected, it could be because some channels are programmed for low power or receive only due to regulations, so change channels. Alternatively, the output power might be set to low, so push [H/L] to select high power.
How to improve the Icom IC-M604 sensitivity?
If the sensitivity is low, the attenuator may be activated. Push [6• LO/DX] after pushing [F] to turn the function OFF.
Why does the Icom IC-M604 scan not start?
If the scan does not start, the TAG channel may not be programmed. Set the desired channels as TAG channels.
Why are there no beep sounds on my Icom Transceiver?
If there are no beep sounds, it could be because the beep tones are turned OFF, so turn the beep tone ON in Set mode. Another possibility is that the squelch is open, so set [SQL] to the threshold point.
What to do if the Icom IC-M604 Transceiver volume is too low?
If the volume level on your Icom Transceiver is too low, there might be several reasons: * The squelch level may be too high: Set the SQL to the threshold point. * The volume level may be too low: Set the VOL to a suitable level. * The speaker may have been exposed to water: Drain water from the speaker. * The internal speaker may be turned OFF: Turn the internal speaker ON in set mode.
How to turn on beep tones on Icom IC-M604?
If you are not hearing beep tones on your Icom Transceiver, it could be due to a couple of reasons. First, the beep tones may be turned OFF, in which case you should turn the beep tone ON in Set mode. Second, the squelch may be open, so you should set the SQL to the threshold point.
General| Brand | Icom |
|---|---|
| Model | IC-M604 |
| Category | Transceiver |
| Language | English |
Critical safety warnings for connecting power and handling the transceiver.
Covers frequency coverage, mode, power supply, temperature, dimensions, and weight.
Details output power, modulation, frequency deviation, stability, and emissions.
Details receive system, IF, sensitivity, selectivity, and audio output.
Identifies major components and boards within the main and logic units.
Shows top and bottom views of the HM-157 microphone's internal components.
Step-by-step guide for safely opening the transceiver casing.
Instructions for detaching the Logic Unit, Main Unit, and AF Unit.
Explains antenna switching, RF amplification, and mixer/IF stages.
Details microphone amplifier, modulation, pre-drive, and power amplifier circuits.
Describes Phase-Locked Loop operation for frequency synthesis.
Covers ATIS/DSC modulation and related signal processing.
Explains the CPU, system clock, and reset functions.
Details voltage lines and regulators within the main unit.
Describes pin assignments for expander ICs on AF and other units.
Lists required test equipment and connection setup for adjustments.
Procedure for adjusting PLL lock voltage for TX and RX.
Steps for setting receiver sensitivity for different channels.
Lists replacement parts for the IC-M604 and its front unit.
Lists components for the logic board.
Lists components for the audio frequency unit.
Lists components for the main circuit board.
Lists parts for optional accessories.
Lists chassis and front unit mechanical components for the IC-M604.
Lists mechanical parts for logic, AF, and connect units.
Lists mechanical components for the HM-126RB/RG and HM-157 accessories.
Displays symbols and common types for transistors and FETs used.
Displays symbols and common types for diodes used in the device.
Top and bottom views showing component placement on VR, SQL, Dial, and Connect units.
Top and bottom views illustrating component placement on the logic board.
Top and bottom views showing component placement on the main unit's PCB.
Top and bottom views illustrating component placement on the AF unit's PCB.
Top and bottom views of HM-126RB/RG and HM-157 microphone PCBs.
Shows voltage distribution and levels on the logic unit.
Illustrates voltage distribution and levels on the main unit.
Shows voltage distribution and levels on the AF unit.
Displays voltage diagrams for HM-126RB/RG and HM-157 microphones.
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