Motorola ASTRO 25 GTR 8000 Manual page 246

MN003286A01-E
Chapter 9: GTR 8000 Base Radio FRU Procedures
• At least 60.96 cm (2 ft) access at the rear of the rack, or
• At least 60.96 cm (2 ft) access on one side of the rack, and at least 6 inches at the rear of the rack
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 If the base radio is not operational, go to
3 Place the base radio in Service Mode, so the system does not attribute the loss of channel to a
failure:
a Connect to the transceiver Ethernet service port using Configuration/Service Software (CSS).
See Connecting Through an Ethernet Port Link on page
b From the menu, select Service → Test and Measurement Screen.
c Click Change to Service Mode.
d At the confirmation screen, click OK.
The base radio halts activity in the current mode and switches operation to the requested
mode.
4 Push the power rocker switch power supply unit to Off (O).
5 Label and disconnect all cables from the base radio backplane.
NOTICE: An RF output cable from the power amplifier connects through a metal
bulkhead to the left of the backplane. This cable does not need to be disconnected.
However, to access the backplane screw behind the metal bulkhead, using a T20 bit,
remove the two screws securing the bulkhead to the inner chassis at the left of the
backplane.
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 to disengage
them from the chassis.
WARNING: 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
Replacing the Fan Assembly on page
9 Disengage the transceiver module and the power amplifier from the backplane as follows:
a Using a T20 bit, loosen the two captive screws on the front of each module, so they
disengage from the chassis.
WARNING: Let the power amplifier module cool before performing the following step
which exposes surfaces of the module that can be extremely hot.
b Using the handles, gently pull the modules until the modules disengage from the backplane.
10 Using a T20 bit, remove the screw that secures the tab on the right Electromagnetic Interference
(EMI) spring panel. See
NOTICE: Removing the left EMI spring panel is operational.
246
step 4.
237.
Figure 105: EMI Spring Panel Guide Rail Alignment on page
140.
249.