Icom M700 Mods < 2026 Update >

: A central archive for power modifications, lockout disables, and various service bulletins.

The Icom M700 series represents a remarkable value for amateur radio operators willing to perform modifications. Whether you need frequency expansion, power adjustment, LSB restoration, or digital interface integration, these marine transceivers can be transformed into capable amateur stations. The modifications range from simple jumper removal to complex component-level work, ensuring there is a project suitable for every skill level. icom m700 mods

The solution revolves around a single wire bridge. Examining the logic circuits section of the service manual reveals that IC1006 outputs mute signals for frequencies outside the marine bands to pins P40 and P41. These pins enable a voltage called "TMU" (presumably Transmitter Mute) via transistor Q1003. The schematics show a wire bridge, W1037, shorting the base of Q1003 to ground. With W1037 installed, the transistor is never engaged to release the TMU voltage, effectively muting non-marine frequencies. By cutting or removing W1037, the radio can transmit on all frequencies. : A central archive for power modifications, lockout