Yaesu FT-100D Repair [2], SRF7043 Crack
![Image](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjMTsXYCJvX0m-U5wlpPYZBavTqDGVcOCysw2lItXwTDQBW9qcl8zkEya2ZN8OifXq6UxFnT2D376IesFIziSoQYFdd31zh8HZgGb3iuU4waLth1d7woqpksWSVXGigk1mb0jlY3IYszZBs/s320/E0F65496-8BEE-455D-8DEA-CF8F5B167484.jpeg)
The FT-100D which I bought last week “for parts or repair” has some issues. I documented those issues in the last post. I have sone some work and have halfway fixed one problem. There was a short which was drawing around 8 amps continuously, all signs pointed to a problem with one of the final transistors. There was a part which had been soldered to the ground plane near the SRF7043 VHF/UHF final amplifier. When I desoldered it, I could see the surface of the SRF7043. After a little cleaning I noticed the dreaded cracking which has happened to a lot of FT-100D radios. I researched and asked in a FT-100 owners group about this and decided to remove the SRF7043. Once I had removed the final amplifier I put power back to the unit and now I no longer have a continuous 8 amp draw. There are no more SRF7043s easily available as replacements. There is a guide by VK3BKC on replacing the SRF7043 with the MRF1570N. The MRF1570N is not a drop in replacement the width of the device is about the s