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东芝90A 型 B 超是综合型 B 超,电路结构复杂,用途较广,尤其是具有板面转换功能。在使用中,不必更换探头即可由板面上的转换开关使之从 A 板面转换到 B 板面,方便地进行探头切换和预置参数的变换。但在使用过程中尤其在多年使用后,会出现板面转换故障。常发生的板面转换故障现象有如下几种:(1)A 板面显示正常,当转换成 B 板面之后,屏幕仅有扇形或台形波形,无回声波,无扫描图像,但图象屏幕上象素不是冻结状态;
Toshiba 90A B-type is a comprehensive B-, complex circuit structure, a wide range of uses, in particular, has a board conversion function. In use, without having to change the probe, the switch on the board can be switched from the A board to the B board so as to conveniently switch the probe and change the preset parameters. But in the course of use, especially after many years of use, there will be a board conversion fault. (1) A board surface shows normal, when converted to B board surface, the screen only fan or Taiwan waveform, no echo, no scan image, but the image screen Upper pixel is not frozen state;