Figure 5-15 Removing The Pmu/Psu - Huawei BTS3900 V200R010 Site Maintenance Manual

5 Replacing Components of the BTS3900
Procedure
Step 1 Power off the BTS3900.
Step 2 Mark the cables on the power supply subrack and the PMU, and then disconnect them.
Step 3 Loosen the two screws on the panel of the PMU/PSU in the power supply subrack, as shown in
Figure

Figure 5-15 Removing the PMU/PSU

(1) Screws on the PMU panel
Step 4 Pull out the PMU or PSU along the guide rails by holding the ejector lever on the PMU/PSU
panel, as shown in
Step 5 Repeat
and then put them into the ESD box.
Step 6 Remove the four M6x12 strews on the two mounting ears of the power supply subrack, as shown
in Figure
5-22
5-15.
NOTE
Figure 5-15 shows the PMU, because the position of the two screws on the PSU panel is the same as that
on the PMU panel.
Figure
Step 3 through Step 4
5-16.
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(2) PMU
5-15.
to remove all the PMUs/PSUs from the power supply subrack,
BTS3900 WCDMA
Site Maintenance Guide
(3) Power supply subrack
Issue 07 (2009-08-30)