I paid around £20 delivered from Hong Kong. Double check that it is (a) a genuine Mitsubishi part, and (b) that it is the correct part (Mitsubishi RD70HVF1 for the Yaesu FT-2800M – check your rig uses the same part). The device would have cooked itself – there is evidence of this in the black charring on the metal surface around the ceramic (white) top of the FET in the above left image. This burr lifts the FET from the surface of the heatsink very slightly but greatly reduces heat transfer. Very good contact between the FET and heatsink is required to transfer heat away from the FET. This is where the device meets the heatsink. You don’t want to kill it!įrom looking at the removed part (above left) you can see, and easily feel, a burr around the outside of the mounting holes (above right). Check these numbers though, I may be wrong! It is electrostatic sensitive, so don’t go touching the pins of the FET if you can help it. In the FT-2800, it’s transistor Q306 on the PCB and Yaesu’s part number for it is G3090140. It’s a Mitsubishi RF power MOSFET RD70HVF1 ( datasheet for part here). The transistor you are looking to replace.
YAESU FT 2800 SERVICE MANUAL MANUAL
The service manual for the FT2800 is here. You’re dealing with power electronics, and so the soldering is big stuff. The job is fairly simple if you’ve used a soldering iron before.
YAESU FT 2800 SERVICE MANUAL DRIVER
I only needed to replace the final transistor, but the driver is replaced in exactly the same way. This page is offered to show you how I did it more what’s involved in doing this yourself. As you may have gathered from other pages on this site, that I am reasonably technical, and so I decided to do the repair myself. Googling around revealed that this is a common fault with the FT-2800. While in a recent QSO I noticed that the power output had dropped to nothing. I bought it second hand at a radio rally and it has, until now, given me years of faithful service. I have had my Yaesu FT-2800M for about 3 years.
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