User's Manual

JUNI JF43-E1900/CFN03
CDMA FIBER FED REPEATER OPERATIONS MANUAL
Version 1.17 ⓒ J
uni America Inc. Page 39 of 88
3.6 Replacement of Faulty Units
Please follow the procedure to replace faulty or failed components and units. The unit
replacement procedure is common to both the DHU and RU.
3.6.1 Remote/Donor Unit Replacement
1. For RU replacement, turn off the HPA of the RU.
2. Turn off the power of the RU or DHU.
3. Disconnect all cables from the faulty unit.
Note: The antenna cables must be disconnected after the repeater power has been
turned ‘OFF’.
4. Dismount the faulty unit from its mounting method.
5. Remount the replacement unit to its position.
6. Connect all cables to the replaced unit.
7. Turn on the power of the replaced unit.
8. For RU replacement, check whether the HPA is off (Turn it off if it is on), and
configure the settings of the replaced unit. These settings should be identical to
the previous faulty unit settings while it was under service.
9. For RU replacement, turn on the HPA of the RU.
3.6.2 Optical Module Replacement
1. Turn off the MCU power first.
2. Turn off the DHU power supply.
3. Disconnect al RF connectors, data cables and optical fiber that are connected to
the Optic Transceiver.
4. Unscrew the multi-turn fastener located at the top and bottom of the module and
pull on the handle to free the optic receiver.
5. Completely remove the module from its slot and place the replacement module
back into the same position being careful not to bump the Optic Transceiver.
6. Tighten the multi-turn fastener and reconnect all cables and connectors.