This is usually due to a stuck or shorted ptt line. I have repaired a couple of these and it was the same component each time. The packet TX transistor Q65 shorted causing the radio to power up in TX inhibit mode. Transistor Q65 is located on the underside of the IF board under the ACC 2 connector. This switching transistor is used only for tx (pin 9 of acc 2) and no other circuits depend on it. It can be removed completely if you don't mind not having ptt on acc 2. This seems to be a common problem lately, I hope this helps you.
I just had the same problem a few minutes ago and discovered that my desk mike's PTT was locked on. The manual says if you power up with the SEND button ON, transmit is inhibited, so powering up with the PTT engaged apparently produces the same result. This happened to me once before but I didn't know what I did to fix the problem. Whew!
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This works for the Furuno 1501-Make sure your connections are the same:#1 provide 15V & gnd to tuner(12V works) #2 connect coax between tuner & Xmtr / antenna to tuner #3 set radio to transmit CW carrier @ no more than 10W #4 momentarily short tune to gnd, this will initiate tune process. Watch SWR meter/ listen for tuner to complete, stop 10W carrier & return radio to normal status. I use mine remotely mounted with a 3 wire control cord & a box with a push button momentary switch back at the radio. Connections are 12V & gnd from the power supply to tuner, tune back to control box where the button shorts it to ground to tune.
The noise blanker settings on the TS-450S (and S/AT) are true noise blankers and should not be thought of as a DSP device or something that they are not, like a notch filter or IF shift and etc. They will do a fine job of eliminating ignition noise as well as eliminating the electric mixer or blender noise from the kitchen...... however they will not remove static crashes or quieten those atmospheric noises on 75 meters during summer time thunderstorm season activity.