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2 pill fat boy was working fine, fuse did not blow or did not see smoke. But there isn`t any modulation whatsoever, inside of box looks like new. Help!!!
You will have to go through the simple things you can control. Check the radio and mic to make sure they are working. Try a different jumper. Make sure the amp is getting power and turns on. Check the radio settings. Once you eliminate everything else then you might have to send the amp in.
With those amps the keying circuit comes as an assembly and if it isn't making any noise that would be my first guess. 2nd would be a loose keying circuit connection at the relay or input SO239.
People asking questions without good descriptive info or pictures won't help at all.
Please advise me to what is a good replacement mic for my SR-497HPC... Answer: 497 is "wired like Cobra", so many choices available. That radio does not need a power mic, so purchase a stock "coffin style" mic with a decent cord, like the ones that Astatic uses. The Superstar DM-507 is my go-to. https://www.ebay.com/itm/3050474478...adANq91JSiEEnz8EGqPJRBloTgEyaVsBoCtoMQAvD_BwE $12.99 + .99 cent shipping.
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