Nokia GSM Base Station Maintenance Procedure Fault Maintenance Fault maintenance includes software faults and hardware faults that can be recovered by restarting. The former can be completed by centralized monitoring/switching or by the base station maintenance center on site, and the latter is completed by the base station maintenance center by replacing the hardware plug-in board. Third-generation base station (DE34) The units that often fail in Nokia\'s third-generation base stations are mainly TRXA, AFEA, RTCC, RMUA, CCFA/C, PSUA/B, etc. For TRX alarms such as \"7705 LAPD FAILURE\" and \"7900 NO CONNECTION TO TRX\", if they cannot be recovered by restarting, the hardware should be replaced. Replace the transceiver unit TRXA steps: Record the cable number of the faulty TRX; Block ... \", enter the faulty TRX number, press the \"OK\" button to close the TRX; TRX Select the MMI (Take the Windows 95 version of MMI 4.0.1 as an example, the same below) menu command \"Objects After confirming that the TRX has no RF output power (the TRX display window should have \"POFF\" displayed), press the \"RST\" button of the TRX; disconnect the RF cables of the TRX and loosen the 4 fixing screws on the front panel, and carefully remove the TRX from the cabinet; check whether the TRX to be replaced is damaged; carefully insert the TRX into the corresponding position of the cabinet, tighten the 4 fixing screws on the front panel, and connect the RF cable; 15) Deblock ... \", enter the TRX number, press the \"OK\" button to open the TRX; TRX Select the MMI menu command \"Objects TRX Loop Test ...\", enter TRX number, time slot number (0,1,...,7), transmit power level \"5\", loop test time (5 seconds), select \"Both Separate\" for the receiving path, press the \"Start\" button, and perform a loop test. If the selected time slot is occupied, you can test other time slots (Note: if baseband frequency hopping is used, this test cannot be performed). The following results should be displayed if the test is successful: - TRX number - TS number ?C Diversity - Status OK, Not tested, or Failed Select the MMI menu command \"Tests
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