17 – 258 HEIDENHAIN Service Manual iTNC 530
Fuses in
UV 105 (B)
8 Shut down the control and switch off the machine.
8 Take precautions against restart.
8 Check whether there is zero potential on the connections.
8 Dismantle the UV 105 (B) power supply unit.
8 Ensure that the unit is not under power.
8 Remove the side plate.
Caution: On the UV 105, one screw is located under the cover of the connector of the
conductor bar.
8 Check the fuses on the power supply board.
Position of the fuses in the UV 105:
Danger of electrical shock!
A switching power supply is located in the UV 105 (B). This switching power supply may
still be under voltage although it is seperated from the power source (without current
consuming unit, the voltage on the board is only reduced slowly).
Do not touch the board or the fuses with bare hands!
Use insulated pincers when removing the fuses!
Be careful not to touch any components on the power supply board sensitive to electrostatic
discharge and observe the ESD regulations!
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