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故障现象进M时显示“TG GC初始化失败。”故障码为T61,且硬件不能复位,查译码为床中层支架(缩写I．S．)A/D转换超过最大允许值。分析与检修见图1。床、扫描架的各种位置信号以及球管温度信号均由TG GC I/O板上的A/D转换器完成模数转换。在A/D转换器的输入端有一个模拟多路选择器,在控制信号作用下可选择八路信号中的任意一路进行A/D转换。由于故障码提示模数转换器的问题,首先利用定标信号检查该A/D转换器本身。结果其偏置与增益均正常。再看I．S．位置信号的A/D转换输出,方法是将诊断板上的“监控”、“方式”和“功能”三开关拨向下方。将数
When the failure phenomenon enters M, it shows that “TG GC initialization failed.” The failure code is T61, and the hardware cannot be reset. The decoding is the mid-bed support (abbr. I.S.). The A/D conversion exceeds the maximum allowable value. Analysis and overhaul are shown in Figure 1. Various position signals of the bed, scanner, and bulb temperature signal are all converted by the A/D converter on the TG GC I/O board. There is an analog multiplexer at the input of the A/D converter. Under the control signal, any one of the eight signals can be selected for A/D conversion. Since the trouble code prompts the problem of the analog to digital converter, the A/D converter itself is first checked using the calibration signal. As a result, both the offset and gain are normal. Look again at I. S. The A/D conversion output of the position signal is performed by turning the “monitor”, “mode” and “function” three switches of the diagnostic board downward. Number