23 – 372 HEIDENHAIN Service Manual iTNC 530 HSCI
Figure: Key code in the integrated oscilloscope
The key code is of secondary importance. Important is, whether or not the control detects the
keystroke.
If a key does not produce a reaction of the control, one does not know, whether the pushbutton
itself or the keyboard PCB, the USB cable or the control component is defective.
Further tests can be performed. --> See descriptions later on in this chapter.
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