Figure 111: External Dual Circulator/Isolator Tray (UHF)
These modules can be replaced individually, or if ordered together, you may receive the modules
already secured to a tray.
WARNING: Shock hazard. The GTR 8000 Base Radio contains dangerous voltages which can
cause electrical shock to personnel or damage to equipment. Set the power supply switches for
the affected equipment to the Off (O) position when servicing this component in the system.
IMPORTANT: Powering down the base radio causes any affiliated subscribers to relocate to
another channel at the site or another channel at an adjacent site. Place the base radios in
Service Mode before powering down so that the system does not attribute the loss of channel to
a failure. Placing a base radio in Service Mode is performed using either Unified Event Manager
(UEM) or Configuration/Service Software (CSS).
Procedure:
1 Wear an Electrostatic Discharge (ESD) strap and connect its cable to a verified good ground.
CAUTION: Wear the ESD strap throughout this procedure to prevent ESD damage to
any components.
2 Place the base radio in Service Mode, as follows:
a Connect to the transceiver module Ethernet service port using CSS. See Connecting
Through an Ethernet Port Link on page 140.
b From the menu, select Service → Test and Measurement Screen.
c Click Change to Service Mode.
MN003286A01-E
Chapter 9: GTR 8000 Base Radio FRU Procedures
255
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