128 Replacing Modules TB9400/TN9275 Installation and Operation
© Tait International Limited May 2023
3. At the front of the PA, connect the transmit forward and transmit
reverse cables, followed by the DC input cable.
4. Reconnect all the other front and rear panel cables previously
disconnected. Ensure the front panel cables are positioned correctly,
and retained where required by the cable retaining clips in the top of
the subrack (refer to “Appendix B Inter-Module Connections” on
page 134).
5. Tighten the nut on the SMA connector to a torque of 5lbf·in
(0.6N·m).
6. Carry out the instructions in “Final Reassembly” on page 131.
9.5 Replacing a Power Management Unit
Notice You must disconnect the AC and DC power cables before
removing the PMU from the subrack.
Removal 1. If you have not already done so, carry out the instructions in “Pre-
liminary Disassembly” on page 124.
2. At the front of the PMU, unplug and remove the output power
cable
b to the subrack interconnect board. Also unplug and remove
the system control bus cable
c.
3. Unplug the output power cable to the PA
d and move it to one side.
4. Loosen the screws securing the retaining clamps
e and rotate the
clamps through 90° to clear the module.
5. Slide the PMU out of the subrack, taking care not to damage any of
the cables.
100W base station
(obscured)
50W base station
b
c
d
d
ee e
(obscured)
e
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