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It may have been PLL instead of PPL. If so, that stands for Phase-Locked Loop, and is the circuit that the transmitter needs to generate the desired frequency to transmit on. That being the case, there's no user remedy and the unit must be serviced by a qualified radio shop.
In the software, there is a transmit inhibit feature. Also, if you try to program some frequencies outside what the radio is allowed to do, they will receive only. This is a Ham radio, not a business band radio. You cannot legally program business frequencies on it from 01/01/2013. It is not US FCC type accepted.
The query you have posted has a positive answer you'll be happy to know.
May I suggest you join yahoo group specific to your radio Make/Model, the team there have specific answers and great info regarding these units, and you can download manuals, schematics and software, if available. All of this is free.
My neighbor just had this problem so I delved into it and fixed it.
You will need another working radio and the cloning cable.
DO NOT GO BUY ONE FOR 23 BUCKS PLUS SHIPPING!!!!!!!
This cable is nothing more than the same one you use to pipe your MP3 player into a car's AUX input. You either have one or know someone who does that you can borrow. If not go buy one from Sears ,Best Buy or any decent truck stop should have them for about ten bucks.
Turn both radios off. Now with the 3.5 mm cable plugged in to both radios hold down the up and down arrow buttons and turn them on. They should say "clone". Now press the" ENT" on the good radio, This will send the data over to the "bad" radio. Now turn them both off, remove the cloning cable and turn them back on. Both should be working now. \WARNING if your battery is in bad shape it can cause the problem to come back. Either deep six the battery or hit the battery for a few seconds with your car battery charger to shock the cells. Some times this can extend the battery's life.