This is a fixed frequency model No.. There is no memory chip in the PCB. But I think there is a memory chip in the dispaly panel control PCB. So I try to set it with remote contrller.
Press the sleep button 10 times within 5s, then beep 4 times, the function is actived;
Press the sleep button 10 times within 5s, then beep 2 times, the function is cancelled.