yaesu ft2000 - UK Vintage Radio Repair and Restoration Discussion Forum

mickm3for · 14th Sep 2023, 3:04 pm

Hi this ft 2000 works fine on rx but tx does not, on cw the out put is 100w and goes back to rx ok but ssb/am/digital rx ok, tx goes to tx but has no output then will not go back to rx only if you turn off and on again. The switching is done by the micro from the ptt line this i have disconnected from the micro no improvement. when on rx output from micro rx8v is ok when on tx rx8v goes to 0v and tx8v goes to 8v but stays like that having gone back to rx . I have changed the control board inc micro and this made no difference at all all voltages ok, the RF is lost at the 2nd tx mixer the voltages around this stage are correct, and it works on CW. i have also isolated the tx8v/rx8v from the rest of the set as soon as ptt taken low on micro it switches rx/tx lines when ptt taken high micro remains in tx mode , the control board and micro was new and works in another radio any pointers Mick

14th Sep 2023, 3:04 pm	#1
mickm3for Heptode Join Date: May 2015 Location: Chatham, Kent, UK. Posts: 890	yaesu ft2000 Hi this ft 2000 works fine on rx but tx does not, on cw the out put is 100w and goes back to rx ok but ssb/am/digital rx ok, tx goes to tx but has no output then will not go back to rx only if you turn off and on again. The switching is done by the micro from the ptt line this i have disconnected from the micro no improvement. when on rx output from micro rx8v is ok when on tx rx8v goes to 0v and tx8v goes to 8v but stays like that having gone back to rx . I have changed the control board inc micro and this made no difference at all all voltages ok, the RF is lost at the 2nd tx mixer the voltages around this stage are correct, and it works on CW. i have also isolated the tx8v/rx8v from the rest of the set as soon as ptt taken low on micro it switches rx/tx lines when ptt taken high micro remains in tx mode , the control board and micro was new and works in another radio any pointers Mick