"No service" symptoms are receiving free network, with simple propagation of ideas after repair, welding antenna switching, filter FL100 is the case. Under RX setting the status measured C152 CP-RX2~4 v, normal, test of RF IC (27) feet, (28) feet, (29) feet, (30) foot Burr-like pulsed signals, explains BB-I, Q normal, but is still not receiving network, only replace the CPU test network, troubleshooting.Qfvservice manual download site