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You do not mention the type of Motorola radio so these comments will be generic in nature:
You need to have your radio turned off when plugging in a headset or audio device. Then press the PTT once after turning on the radio. This should aclimate the headset to the radio. If you were to plug in the headset with the radio turned on, it will appear to be in VOX. But will be stuck with the Transmit side open.
Your H and L PTTs are likely a high power 1-2 watts and a low power one half watt setting. Without the radio model and user guide, we cannot research this further.
You can increase the power supply to 15 Volts, but your rig is small to dissipate the cold air inside. Place a small fan in the rear. You not need more power and the difference is barely disguisable to the other part. Put your effort in a batter antenna. Regards. Edgardo LU1-AR
Have you performed a FULL reset on the TS-2000? To perform a full reset:
With the power off press and hold down the A=B button and with the other hand turn on the TS-2000. After that you will have to press the A=B one more time. The radio will reset itself, and the display will show 14.000 MHz in the main band, and 144.000 MHz in the sub band.
Please let me know if it worked for you. Tommy KG4TDM @ arrl .net
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.