Unit installation

RSU-503 Redundancy Switch Unit Maintenance
Rev. 8 4–3
4.3 Servicing with Power On
If maintenance must be performed on the unit while the link remains on the air, proceed
as follows:
1. Loosen the access panel screws on the side of the switch case (refer to
Figure 4-2) to expose the internal M&C Logic Control PCB.
Figure 4-2. Access Panel
2. Observe the LEDs on the M&C board, which will indicate the following:
a. Receipt of power from RFT A
b. Receipt of power from RFT B
c. Transfer switch power (32V) available
d. Summary fault indicator, if any fault in the system
e. Uplink RFT, Unit A fault
f. Uplink RFT, Unit B fault
g. Uplink Indicator Ambiguity fault
h. Uplink unit A or B currently online
i. Uplink mode in Auto or Manual
j. Downlink RFT, Unit A fault
k. Downlink RFT, Unit B fault
l. Downlink Indicator Ambiguity fault
m. Downlink unit A or B currently online
n. Downlink mode in Auto or Manual
3. Refer to Section 4.4 for troubleshooting assistance.