Service Manual

336
6802800U74-AN
Chapter 11: Power Supply Unit
Name of
Type To/From Comment
Pin 1 +Vfan
Pin 1 -Vfan
Pin 1 -Vfan
Pin 1 Alarm
11.3
Replacing the Power Supply Unit (PSU)
See the PSU power up sequence in Powering Up the MTS on page 140.
For a list of available FRUs, see Field Replaceable Units (FRUs) on page 446.
Process:
1 Remove the PSU, see Removing the Power Supply Unit (PSU) on page 337.
2 Install the Power Supply Unit into the cabinet, see Installing the Power Supply Unit (PSU) on
page 337.
3 Update the mapping list with the new unit TrackID, see Updating the Mapping List with the New
PSU TrackID on page 337.
Connector
Pin 10 - 11
+28.5
V
Pin 4 - 6
GND
Base Radio
Pin 9
+7 V
Pin 12 - 13
+28.5
V
Pin 7
GND
Site Controller
Pin 14
+28.5
V
Fan 1
MOLEX (4 pin,
male)
Fan 1
DC supply for Fan 1
Pin 1
+Vfan
Pin 1
-Vfan
Pin 1
-Vfan
Pin 1
Alarm
Fan 2
MOLEX (4 pin,
male)
Fan 2
DC supply for Fan 2
Pin 1
+Vfan
Pin 1
-Vfan
Pin 1
-Vfan
Pin 1
Alarm
Fan 3
MOLEX (4 pin,
male)
Fan 3
DC supply for Fan 3