17 – 260 HEIDENHAIN Service Manual iTNC 530
17.1.3 UV 106, UV 106 B
Possible
causes of error
Supply voltage to U and V missing
Fan has failed
Fuse on board of the UV 106 (B) released
UV 106 (B) defective
Troubleshooting
UV 106 (B)
When checking the UV 106 (B) power supply unit, proceed as follows:
Control of the LED
READY UV
The LED READY UV on the front panel of the UV 106 (B) indicates the readiness of the unit.
Function of the fan
8 Check, whether the fan of the UV 106 (B) is running.
If it does not, this might indicate that ...
no supply voltage for the UV 106 (B) is available
fuses in the UV 106 (B) have released
the UV 106 (B) is defective.
The fan itself might be defective.
Checking the
supply voltages
8 Measure carefully, whether 400 Vac ±10 % are available on U and V of connector X31 on the
front panel.
Danger of electrical shock!
High voltages and currents
It is not useful to measure the low voltages on the 50-line ribbon cable of the UV 106 (B)
(e.g., with the HEIDENHAIN test adapter).
The MC cannot be connected. The low voltages, however, must be measured while under
load.
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