HEIDENHAIN iTNC 530 Service Manual page 365

The setup described below allows to make an almost complete statement about the condition
Measuring setup
of the connected keypad.
with test adapter
However, a special appliance is required. --> See "Test Adapter" on page 29 – 562.
Test inclusive keyboard cable:
July 2010
Note
If no test adapter is available, you can measure directly at the contacts of the keyboard cable
or the keyboard.
However, this is very cumbersome, since you must contact the right pins precisely while
pressing the key to be inspected!
Shut down the control and switch off the machine.
Disconnect the keypad cable on connector X45 of the MC.
Connect the keypad cable to the test adapter.
Figure: Keyboard test with test adapter and multimeter
22 – 365