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故障现象 开、关机正常,但在使用过程中电池电压降低时,LCD液晶屏显示紊乱,各功能键失常,原来存入的频率消失,不能接收和发射。 分析与检修 根据故障现象分析,此故障发生在电脑板(X53-3400-A5)。首先检查电源电压+B为7.2V,5MH端电压为5V,正常。锂电池电压为1.2V(正常时为3.2V),但换一新的锂电池后,故障依旧。测量微处理器IC6(97)脚电压为4.7V,正常,但取下电池后,该电压迅速降为0V,而正常时,该电压由于电容C15、C96放电的缘故应缓慢下降。测量C15、C96无异常,故怀疑电路存在短
Failure phenomenon, turn off normal, but in the course of the battery voltage is reduced, the LCD screen display disorder, the various function keys are abnormal, the original deposit frequency disappears, can not receive and launch. Analysis and Maintenance According to the failure phenomenon analysis, this fault occurred in the computer board (X53-3400-A5). First check the power supply voltage + B is 7.2V, 5MH terminal voltage is 5V, normal. Lithium battery voltage of 1.2V (3.2V normal), but for a new lithium battery, the fault still. The measurement voltage of microprocessor IC6 (97) is 4.7V, normal, but the voltage is rapidly reduced to 0V after removing the battery. Normally, this voltage should be slowly decreased due to the discharging of capacitors C15 and C96. Measurement C15, C96 no exception, it is suspected short circuit