Disassemble, U350 module (TXVCO) 14 feet of welding wire fraud of a 10cm antenna. Power on boot, try to make a call, pull different description launch phase lock circuit may have failed. Use cases to judge the U350 itself properly, refer to figure 8 spectrum inspection C356 sampled signal failed to appear, prove phase-locked loop circuit, double check, R350 pads cracking. Welding and R350, try dial telephone, function calls, troubleshooting.EJjservice manual download site