Motorola ASTRO 25 GTR 8000 Manual page 247

11 Carefully slide the EMI spring panel forward, noting how the panel is affixed onto the power
supply guide rail. The panel does not need to be completely removed.
12 Remove the fan cable from the backplane, from the front of the chassis, with the backplane still
secured to the chassis, as follows:
a Follow the fan cable with your hand from its connector at the front of the chassis to its
connection to the backplane, through the card cage section from where the power supply
module was removed.
b Remove the fan cable multi-pin connector from the backplane by squeezing the top and
bottom of the connector and pulling the connector straight out from the backplane.
13 Using a T20 bit, remove the five screws that secure the metal backplane cover and the
backplane circuit board to the rear of the chassis.
14 Remove the metal backplane cover and the backplane circuit board.
15 Place the new backplane circuit board in the same location and orientation as the one removed.
16 IMPORTANT: Start threading all five screws into the backplane circuit board and
backplane cover before they are fully seated and secured.
Secure the new backplane circuit board and the backplane cover to the rear of the base radio
chassis with the five screws removed in step 13. Torque to 18+/-2 in-lb.
17 Reinstall the metal bulkhead that holds the RF output cable from the power amplifier, using the
two screws removed in step 5 to secure it to the inner chassis at the left of the backplane.
18 Connect the fan cable to the new backplane, from the front of the chassis, with the backplane
secured to the chassis, as follows:
a Locate the port in the new backplane for the fan cable multi-pin connector.
b Follow the fan cable with your hand from its connector at the front of the chassis to the
connector at the other end of the cable.
c Push the fan cables multi-pin connector, with the tab up, into the correct location in the
backplane.
Chapter 9: GTR 8000 Base Radio FRU Procedures
MN003286A01-E
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