Replacing A Gtr 8000 Base Radio Backplane; Figure 103: Gtr 8000 Base Radio Showing Connections To Backplane Through Backplane Cover - Motorola ASTRO 25 GTR 8000 Manual

Base radio
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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
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 Service → Test 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.
Showing Connections to Backplane Through Backplane Cover on page 245
that must be removed to access the backplane. See
(Integrated Voice and Data) on page 105
page 108
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:
Chapter 9: GTR 8000 Base Radio FRU Procedures
Replacing the Fan Assembly on page
GTR 8000 Base Radio Rear Connections
and
GTR 8000 Base Radio Rear Connections (HPD) on
237.
Figure 103: GTR 8000 Base Radio
shows the metal cover
MN003286A01-E
245

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