Instruction Manual

Table Of Contents
10 Slide in the replacement power amplifier module until it engages with the backplane. A slight
push may be needed to securely engage the module.
IMPORTANT: If the power amplifier module stops well before it is engaged, it is in an
incorrect position. Either it is in the wrong slot or it is rotated 180 °.
11 Using a T20 bit, tighten the two captive screws on the front of the module to secure the power
amplifier module to the chassis.
12 Reinstall the fan unit. See Replacing the Fan Assembly
on page 238.
NOTICE: If you chose to turn off the power, set the rocker switch on the front of the
associated power supply to the On (I) position.
13 Verify that the power amplifier is operating properly:
The power amplifier Status and Transmit LEDs are green.
The Alarm LED is off.
Proper operation is confirmed using software tools, such as Unified Event Manager (UEM) or
the Transmitter Metering Screen in CSS.
14 Place the base radio in Normal Mode, as follows:
a From the menu, select ServiceTest and Measurement Screen.
b Click Change to Normal Mode.
c At the confirmation screen, click OK.
The base radio halts activity in the current mode and switches operation to the requested
mode.
9.9
Replacing a GTR 8000 Base Radio Backplane
In a GTR 8000 Base Radio, the backplane is the circuit board at the rear of the card cage which
connects the power supply, transceiver, and power amplifier. Figure 103: GTR 8000 Base Radio
Showing Connections to Backplane Through Backplane Cover on page 246 shows the metal cover
that must be removed to access the backplane. See GTR 8000 Base Radio Rear Connections
(Integrated Voice and Data) on page 106 and GTR 8000 Base Radio Rear Connections (HPD) on
page 109 for the ports and cables that must be disconnected to remove the cover.
Figure 103: GTR 8000 Base Radio Showing Connections to Backplane Through Backplane
Cover
Prerequisites: The procedure assumes the following service access clearances:
MN003286A01-H
Chapter
9: GTR 8000 Base Radio FRU Procedures
246