User's Manual

JUNI JF43-E1900/CFN03
CDMA FIBER FED REPEATER OPERATIONS MANUAL
Version 1.17 ⓒ J
uni America Inc. Page 68 of 88
5. System Maintenance
This section explains the JF43 FFR system fault detection and alarm reporting
system, and provides a method for determining troubleshooting faults.
Maintenance also includes diagnosing and correcting service problems as they occur.
When an alarm is reported, it will be necessary to follow a systematic troubleshooting
procedure to determine the problem. Once the problem has been isolated, the
appropriate corrective measures must be taken to restore service. The only internal
components that can be replaced are the cooling fans which are mounted in the DHU
and RU. All other failed internal components will require Juni engineers to replace and
test the units.
5.1 Periodic Maintenance
The JF43 FFR requires minimal regular maintenance to insure continuous and
optimal operation and performance. However, it is advised that the DHU and RU are
checked often. Components that require regular replacement, cleaning, or testing
include the DHU and RU fans and backup battery. The NEMA 4X enclosure ensures
that the JF43 FFR can withstand all environmental influences. The following two
procedures can also be followed when a fan fails and needs to be replaced.
5.1.1 Donor Unit Fan Maintenance
1. The fan is located above the MCU and is labeled ‘Fan Control Unit’.
2. Unplug the 24V power cable feeding the Fan Control Unit.
3. Unscrew the two multi-turn fasteners on each side of the compartment.
4. Pull out the Fan Control Unit completely from its position.
5. One fan is used to cool the DHU which will require regular maintenance by