February 2012 23 – 381
23.7 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 equipment.
Potentiometers Replace the defective potentiometer.
Control
components
If you have found that the USB interface of the TE 6xx or MC 6222 or BF 250 is defective, replace
the control component. --> See ”Exchange of HEIDENHAIN components” on page 29 – 515.
Observe the ESD precautions. --> See ”Important information” on page 29 – 515.
When liquid cleaning agents were 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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