Replacing The Power Supply Unit - Nokia MetroSite Maintenance Manual

6.7

Replacing the power supply unit

WARNING
Lethal voltages!
Turn the site mains power OFF before disconnecting the power supply
cable!
Replacing the power supply unit (PSU)
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Turn the power feed to the BTS OFF at the main circuit breaker.
Open the power supply connector shield and the sealing pieces.
Disconnect the power cable from the connector on the PSU.
Open the upper and lower retaining screws of the unit with a T10 Torx
driver. Loosen the screw enough to remove the unit, but leave them
engaged in the threads to allow easy refitting.
Remove the power supply unit. Pull the unit out from the front until the unit
comes to stop, then pull it out from the side. See Figure 7.
Unpack the new power supply unit.
Insert the new power supply unit to the unit's slot from the side of the
cabinet. Push the unit towards the backplane. Do not use excessive force!
Tighten the retaining screws to 1.5 Nm (1.11 lb ft) with a T10 Torx driver.
Reconnect the power supply cable.
Fit the sealing piece into the power supply connector shield, close the
shield, and tighten the retaining screws.
Turn the site mains power ON from the main circuit breaker.
Turn the BTS power supply unit ON.
Draft
Replacing units
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