G'day....

I have an IC7000 on the bench that has me stumped for an answer for a few months now, it came to me from a friend and the driver had burnt up with the owner noting that it had odd audio and the power meter would go up on SSB with no audio applied so I suspected RF getting back into the unit being the cause of the failure. I checked the driver model and it was the later type so I ordered one and replaced it.

All checked ok after repair and it transmitted fine but after a few days the meter issue and bad audio returned, I put the unit on the bench, on a dummy load, no mic, just a switch and the fault persists, I measured power at the driver, nothing in, nothing out, the DC is ok with no RF on it so something is sending the unit into a fault state. I contacted Icom and they said do all transmitter alignments and have done so, no change, any clues on this one?

I did see an article that the AGC sense line needs a resistor changed from 0 Ohms to 330 Ohms if the unit had an early driver and a later one fitted but as far as i know this has always had the later driver, the serial number is missing off the chassis that makes it a bit more difficult to be 100% sure on what the build was on it.

Any help would be greatly appreciated.

Thanks

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Regards - Tony Eagling Vk7YBG