23 – 370 HEIDENHAIN Service Manual iTNC 530 HSCI
23.4 Checking the keys
This inspection includes:
The hard keys on the the TE 6xx keyboard unit
The soft keys on the MC 6222 or the BF 250 flat-panel display
The soft-keys rows on the screen are connected to the keyboard PCB via a ribbon cable.
Correct operation? Ensure that the key really has to function in the selected operating mode. --> Consult the machine
operator or the User's Manual!
Visual inspection Start with a visual inspection:
Is the key heavily contaminated (grease, dust, oil, etc.)?
Are there any jammed chips?
The key may thus get stuck.
In such events carefully clean the keyboard. --> See ”Corrective action” on page 23 – 381.
Is the key or the area around it heavily worn?
This is an indication that the service life of the key has expired and that it does not make contact
any longer.
Does the control
receive the
key signal?
Observe the key code in PLC word W274 when pressing the keys:
8 Switch on the machine.
8 Press the EMERGENCY STOP button.
8 Call the table with the PLC words. --> See ”The TABLE function” on page 11 – 119.
8 Place the cursor on the word 274.
8 Press the key to be examined and check, if the display changes to a key code or if the reaction
expected for this key takes place.
Figure: Key code in the PLC table
The inspection of the keys on the machine operating panel of the TE 635 Q is described in the
chapter Machine operating panel.
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