Wednesday, December 23, 2020

Fixing the FT-900 PLL issues

And we were doing so well with the cheap HF radio and then the PLL unlocked again across all bands. Opening up the radio it then locked and was back to normal???????? Put it back together and it was fine for 20 minutes and then unlocked again. Opened it up AGAIN and probed around, touching/pressing two cans caused it to lock up and then on touching them again it unlocked and then locked. OK, seems to be a bad joint, bad track, or some other issue with the board, maybe due to stress??


I took it apart and reflowed the cans and most of the through hole components around that area and after 6 hours it is still working fine across all bands. Fingers crossed!

In case this helps anyone else with FT-900 PLL issues (and I know there are a few after perusing the QRZ forums), I've circled the area that I reflowed.



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