FTDX-1200 not used for a while, suddenly when radio turned on TX red light flashing. Receiver is normal but TX cannot transmit, either PTT pressed or MOX button pushed radio no response. Checked all voltage line aither in PA-Unit module and Control-Unit module everything is fine. Something interested is fan always running, is it running as designed? Some advice from googling indicate to plug off the power supply cable without turn off the radio, and wait for a view hours before replug again. The ideas was done but result is same. Wondering if anyone have the same problem. Appreciate if anyone can share here. Thanks in advance. 73. Nuril YC1UTC.