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Method of Procedure 
Operations and Maintenance 

RFN_3.1 Beta

 

two RFS components. During installation, ensure that the URU is receiving 
power before installing RFS components. 

Each RJ45 port has two LEDs: Link (right) indicates Ethernet connectivity, and 
Activity (left) blinks to indicate Ethernet activity between RFS components. For all 
other conditions, refer to the following table. 

 

LEDs are not lit 

connection is not being 
made between URU 
and RFS components 

 

Verify that the URU is plugged in to an 
approved power source. 

 

Verify that each RFS component is 
powered on. 

 

Verify that all cabling between the RFS 
components is properly connected. 

For the iSC-3 and EAS, refer to Chapter 11 “FRU Replacement Procedures” of 
the Gen 3 Site Controller System Manual, Motorola, 68P80801E30-O. 

1  Loosen the three screws that secure the top access cover, and then remove 

the cover. 

2  Grasp the Circuit Breaker to be replaced and pull it out until it is removed 

from the assembly. 

3  Install the new CB, pressing it in until it is firmly seated. 

Note: Be very careful when installing the output breakers. The common pin of 
the alarm circuit on the breaker must engage the jack on the plant. Tolerance 
is tight; go straight in with the breaker. 

4  Ensure there is not a Fuse Alarm condition present. If an FA is present, 

remove and install the CB until the FA condition clears.