Motorola GTR 8000 Manual page 266

GTR 8000 Base Radio
1 Wear an electrostatic discharge (ESD) strap and connect its cable to a verified good ground. Be sure to wear this
strap throughout this procedure to prevent ESD damage to any components.
2 If the base radio is not operational, skip to
Disable the base radio with the backplane being replace, so the system does not attribute the loss of channel
3
to a failure.
a. Connect to the device modules Ethernet service port using Configuration/Service Software (CSS). See
Connecting Through an Ethernet Port Link, page
b. Select Service → Test Measurement Screen from the menu.
c. Click Change to Service Mode.
Step result: The base radio is disabled.
4 Push the power rocker switch power supply unit to Off (0).
Label and disconnect all cables from the base radio backplane.
5
There is an RF output cable from the power amplifier which connects through a metal bulkhead to the
left of the backplane. This does not need to be disconnected. However, to access the backplane screw
behind the metal bulkhead, remove the two screws securing the bulkhead to the inner chassis at the
left of the backplane using a T20 bit.
6 Label, then disconnect all cables from the front ports on the transceiver.
7 Remove the power supply module from the chassis as follows:
a. Using a T20 bit, loosen the two captive screws on the front of the power supply, so that they disengage
from the chassis.
It is recommend to let the power supply module cool before performing the following step,
which exposes surfaces of the module that can be extremely hot.
b. Pull on the metal handle to disengage the power supply module from the backplane, and remove it
completely from the chassis.
8 Remove the fan assembly to gain access to the transceiver and power amplifier modules. See
Fan Assembly, page 9-10
9-22
step 4.
for instructions on removing the fan assembly.
4-11.
4.4.4
9.3 Replacing the
6871022P86-A - November 2012