Icom Ic-705 - Service Manual Pdf
Several users have reported a known issue where connecting a cheap or poorly designed external amplifier can damage the radio. The amplifier's trigger line can send voltage back into the IC-705, potentially destroying the output FETs (field-effect transistors) on the radio's interface board. The service manual's schematic and parts list are essential for identifying the failed components (often switching FETs) and ordering the correct replacements.