23 – 398 HEIDENHAIN Service Manual iTNC 530
23.6 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 MB from the console. (Take care that all connected cables are labeled before you
disconnect any.)
8 Dismount the board, frames, rubber mats.
8 Clean the components with a standard cleaning agent and a piece of cloth.
8 Dry (or let dry) the components.
8 Reassemble the MB.
Other MB
components
Replace defective components, such as the cable between MB and control, the board, the
buttons NC START, NC STOP and EMERGENCY STOP, CONTROL ON, lamps, etc. with original
components!
Control If you have found that the MB interface of the control is defective (connector X46), replace the
MC. --> See “Exchange of HEIDENHAIN Components” on page 28 – 523.
Measure the output voltages, e.g. at terminal X4 of MB 420 at terminal X12 of the MB 520
or with a connected test adapter.
The logic state in the PLC-TABLE must be in agreement with the voltage level of each
output!
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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