18 – 266 HEIDENHAIN Service Manual iTNC 530 HSCI
Troubleshooting 8 Observe the operational status indicator LED on top of the CC 61xx. It is supposed to indicate the
HSCI address of the CC by a blink code.
8 Measure the 5 V voltage at X74.
8 You can also measure the low voltages on the supply bus X69, provided that you have a test adapter
available. (See ”Test adapter” on page 30 – 560.)
8 In the window Hardware/firmware change detected, click Reject and then call the HSCI bus
diagnosis. --> See ”Bus diagnosis” on page 12 – 147.
8 Call DriveDiag. --> See ”DriveDiag” on page 9 – 91.
8 Place the cursor on Control board 1., call the screen Voltages and currents and check the voltage
in the line Supply voltage +5 V. The value of this voltage should not be below +4.90 V.
8 Repeat this check for all drive-control boards (Control board 2, etc.)
Figure: Display of the +5 V supply voltage of the drive-control boards in the CC with DriveDiag
8 Disconnect the position and speed encoders and the PWM outputs from the CC (label them
beforehand).
8 Then observe, whether the 5 V voltage is stable.
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