Subject:IC229H. CPU RFI Hello From Mike, N3KCT ! For those owners that have encountered CPU RFI from your IC-229, Here's the fix! The problem is cured by properly grounding the CPU/Display board. First remove the top and bottom covers. Then carefully remove the threaded mic connector which fastens the mic jack to the front panel. Remove All Knobs and then the four screws that hold the front panel onto the metal chassis. This exposes the clear display housing and CPU board when you slide the front panel off. There will be three screws that hold the display panel along with the CPU board onto the main chassis. Two are next to the mic connector, and one is next to the channel control knob. Remove these three screws and the entire display/CPU section will come off in one piece. You will not have to disconnect any of the wiring. Carefully clean the ground traces that these screws go through on the back of the CPU board and tin them. They are around each screw hole on the CPU board. When the radio is re-assembled, these traces will now properly ground out the CPU section and cure your RFI problem. Appearantly something happened during manufacture that caused these to be covered with that "clearcoat" stuff to prevent them from grounding out. This fix has been 100% effective on mine and several other radios. The problem is NOT in the mic, it is just poor grounding of the CPU! Any questions or comments can be sent to: N3KCT@NR3U.#NCPA.PA.USA.NA 73 de Mike !! P.S. I do not assume any responsibility for this mod, so procede only at your own risk and capability.  Amsterdam View Our Stats   CLICK FOR A FREE DOMAIN NAMES HTTP://WWW.YOURNAME.TK FOR YOUR OWN WEBSITE IF YOU CLICK HERE AND YOU CAN VOTE FOR OUR FREE WEBSITES IN THE TOP 100 LIST  WANT A TOP RANKING ? USE THE ULTIMATE SOFTWARE SUITE FOR WEB SITE PROMOTION  FreeWebSubmissions Submit Your Site To The Web's Top 50 Search Engines For Free THE ALEXA BANNER, THIS BANNER GIVES THE DALLY STATISTICS OF THIS FREE WEB SITE The World of Free Packet Radio Software Amsterdam The World Of Free Packet Radio Software Amsterdam The Netherlands |