July 2010 22 – 371
22.7 Corrective Action
Pushbuttons If a key no longer makes contact:
Defective pushbuttons are not replaced individually!
Reason: If individual pushbuttons make bad contact or fail, other keys will also reach the end of
their service life soon.
Therefore, only complete boards including the pushbuttons are replaced.
If a key permanently makes contact:
If required, remove chips and clean the keyboard!
8 Shut down the control and switch off the machine.
8 Remove the keyboard from the console (take care that all connected cables are labeled before
you disconnect any).
8 Disassemble the keyboard.
8 Clean the components with a standard cleaning agent and a piece of cloth.
8 Dry (or let dry) the components.
8 Reassemble the keyboard.
Potentiometer Replace the defective potentiometer.
Control If you have found that the TE interface of the control is defective (connector X45), replace the
MC. --> See “Exchange of HEIDENHAIN Components” on page 28 – 523.
Observe the ESD precautions. --> See “Important Information” on page 28 – 523!
When liquid cleaning agents have been used, the electrical devices must dry completely
before they may be operated again.
Put the rubber mats back into the frame as they were before.
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