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#117: Repair Log, Part 2: Yaesu FT-7800 Dual Band FM Transceiver, fixed 2m tx problem

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Published on Nov 1, 2013

This is part two of the repair video for the Yaesu FT-7800 dual band transceiver. For part one, see the link below this text. The faulty PIN diodes turned out to be discontinued. A viewer of the part 1 video suggested that the successor radio (FT-7900) is very similar and uses a different part number for these PIN diodes. Further investigation revealed that this part of the circuit design is essentially identical, so I ordered the diodes used in the 7900. This video shows the replacement process and bench check for 2 meter transmit operation. I deeply apologize for the lousy camera angle and video work at about the 9 minute mark.
Part 1:
http://www.youtube.com/watch?v=Cz_Ocs...
To learn more about PIN Diodes, see this tutorial video:
http://www.youtube.com/watch?v=XpYsCM...

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