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一、故障一(一)故障现象开机后无载波功率、边带功率输出;控制单元面板红色告警灯V1(BEARING)、V2(SUBCARRIER)、V3(NOTCHDVOR30HzFMCVOR)、V4(30HzAM)、V5(IDENT)、V6(TxFWD)、V7(TxVSWR)、V8(SIDEBAND)全亮;自动换机。(二)检修过程根据故障现象分析,无载波功率可能是CGD部分出现故障。检查1A71155输出,从1A71155的XFB、XFA测量均无输出;再检查电源部分,发现电源部分指示正常;最后检查DCC部分,经测量DCC+5V输出为零。于是排除CGD部分故障,判断为CCB部分故障。检查电源控制开关组件(CCB)时发现1A71128的V2(2N6835)损坏,更换同一型号V2后,故障现象消失,机器恢复正常。
First, the failure of a (A) Failure phenomenon No carrier power after boot, the sideband power output; control unit panel red warning lights V1 (SUBCARRIER), V3 (NOTCHDVOR30HzFMCVOR), V4 (30HzAM), V5 (IDENT) , V6 (TxFWD), V7 (TxVSWR), V8 (SIDEBAND) all bright; automatic replacement. (B) the maintenance process According to the failure phenomenon analysis, no carrier power may be CGD part of the failure. Check the 1A71155 output from the XFB, XFA 1A71155 measurements were no output; then check the power supply section and found the power part of the instructions normal; Finally check the DCC part of the measured DCC 5V output is zero. Therefore, part of the CGD troubleshooting, judged as part of the CCB failure. Check the power control switch assembly (CCB) found 1A71128 V2 (2N6835) damage, replace the same type V2, the failure disappears, the machine back to normal.