Automatic search AFC circuit and recognition of Taiwan should be no (synchronous signal recognition) circuit has a problem; Boot search program, measured with a multimeter IC1101 feet and 5 normal IC1101 27 feet, after careful observation charge process, found that manual searching program is clear, and the automatic searching obviously very weak signal, and then to the AGC circuit inspection, found that disconnect diode D101, automatic search platform and clear, it is clear that this failure is under automatic search AGC voltage is abnormal, the signal is weak due to the cause, fault culprit should be Q101, UN2212, replace the normal machine.4Mpservice manual download site