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例一故障现象:打开电源即显示符号,并在机内无磁带时进行加载运行动作,且不能停机。分析与检修:因为打开电源即显示符号,判断为带仓控制系统故障。测带头、带尾光电管、带端灯完好,测试发现电源部分PG_(871)第④脚无电压,且对地无短路现象(而机器正常时,该点应有12V电压)。此部分的输入端PG_(1001)各脚电压正常。拆下该机电源部分,检查G_(873)。完好,其V_c=13.8V、V_c=11.5V。查GF_(871)开路,它是塑封保险管,因无此
Example A fault phenomenon: Turn on the power that is displayed symbol, and when there is no tape in the machine to load and run movements, and can not be shut down. Analysis and Maintenance: Because the power is on, the symbol is displayed and it is determined that the storage control system is faulty. Test head, with the end of the photoelectric tube, with the end lamp intact, the test found power section PG_ (871) the first leg voltage and no short circuit to ground (and the normal machine, the point should have 12V voltage). This part of the input PG_ (1001) each pin voltage is normal. Remove the machine power section, check G_ (873). Intact, its V_c = 13.8V, V_c = 11.5V. Check GF_ (871) open circuit, it is plastic fuse, because no such