Alcatel-Lucent 7750 SR-a8 - Figure 64 Replacing a -48 VDC PSU (7750 SR-A8); Table 92 -48 VDC PSU Replacement Features

Removing and Replacing a PSU
182 7750 SR-a4 and SR-a8 Installation Guide
Figure 64: Replacing a –48 VDC PSU (7750 SR-a8)
To replace a –48 VDC PSU module:
Step 1. Ensure external power has been disconnected or turned off at the branch circuit
device.
See 7750 SR-a –48 VDC PSU LED and Connectors for more information.
Step 2. Align the PSU module with the chassis guides in power slot (Key 1 in Figure 63).
Step 3. Grip and hold the handle (Key 2 in Figure 63) on the PSU with your hand.
Table 92: –48 VDC PSU Replacement Features
Key Description
1 Chassis guide
2 PSU handle
3 Spring-loaded latch lock
4 Direction of movement
7
7
5
0
S
R-a
4
Fan
T
r
a
y
P
wr
S
tat
Sl
o
t
L
a
you
t
1
/
1
XP
1
/
2
1
/
3
1
/
4
2
/
1
XP
1
2
/
2
XP
2
/
3
2
/
4
C
PM
A
2
CP
M
B
77
50 S
R
-
a8
Ser
v
ice R
outer
P
w
r
S
tat
Pwr
St
at
7750
M
DA-aXP
1
0
-1
0
G
B
-S
F
P
+
10
L
n
kAc
t
9
Ln
k
Ac
t
8
L
n
kA
ct
7
L
nk A
c
t
6
L
n
kA
c
t
5
L
n
kAct
4
L
n
k
A
c
t
3
L
n
kA
c
t
2
L
n
k Act
1
L
n
kAc
t
Pwr
775
0
M
DA
-
aXP
6
-
1
0
G
B-
S
FP
+
1
-
4
0
G
B-
Q
S
FP
+
S
t
a
t
6
L
n
k
A
c
t
7
L
n
k
Ac
t
5
L
nk A
ct
4
L
n
k
A
c
t
3
L
n
k
A
ct
2
L
n
kAct
1
L
nk A
ct
Pwr
7
7
5
0
M
D
A
-
a
4
-
1
0
G
B-
S
FP
+
S
t
at
3
L
n
kAc
t
4
Ln
kA
ct
1
L
nk
A
c
t
2
Ln
k
A
ct
Pwr
7750 MDA-a
4
4
-1
G
B
-
C
S
F
P
/
S
F
P
St
at
Lnk/A
c
t
1
2
3
4
5
6
7
8
9
1
0
11
12
1
3
1
4
1
5
1
6
2
5
2
6
27
28
2
9
3
0
3
1
32
33
3
4
3
5
36
37
3
8
3
9
4
0
4
1
4
2
43
4
4
17
1
8
1
9
2
0
2
1
2
2
2
3
24
Pwr
7750
M
D
A
-a
2
0
-1
G
B
-TX
St
at
Lnk
1
A
c
t
2
Lnk
3
A
c
t
4
Lnk
5
A
c
t
6
Ln
k
7
A
c
t
8
Lnk
9
A
ct
1
0
Lnk
1
1
A
c
t
1
2
Lnk
1
3
A
c
t
14
Ln
k
15
Act
16
Lnk
1
7
A
c
t
1
8
Lnk
1
9
A
c
t
2
0
P
wr
7750 MDA-a
1
2
-1
G
B
-S
F
P
2
-1
0
G
B
-S
F
P
+
S
t
at
L
n
k
/
A
c
t
1
2
3
4
5
6
7
8
9
1
0
1
1
1
2
L
n
k
Ac
t
1
3
1
4
Ln
k
A
c
t
P
wr
7
7
5
0
M
D
A-
a
4
-
1
0
G
B-
S
FP
+
S
t
at
3
L
nk
Ac
t
4
L
n
k
A
c
t
1
L
n
k
A
c
t
2
L
nk
A
c
t
P
wr
7
7
5
0
SR-a
S
t
a
t
Sy
n
c
E/1
5
8
8
A
l
ar
m
s
1
P
P
S
A
CO/
LT
Cri
t
i
c
a
l
Lnk
D
TE
P
w
r
7
7
5
0
CP
M-a
S
t
at
Co
n
so
l
e
M
gmt O
E
S
B
I
TS
C
om
pact
Fl
ash
DCE
A
c
t
Lnk Ac
t
M
a
j
or
Minor
Sy
n
c
E/1
5
8
8
A
l
ar
m
s
1
P
P
S
A
C
O
/
LT
Cri
t
i
c
a
l
Lnk
D
TE
Pw
r
7
7
5
0
C
P
M-a
S
t
a
t
Co
n
so
l
e
M
gmt
O
E
S
B
I
TS
C
om
pact
Fl
ash
D
CE
A
c
t
Lnk
Ac
t
M
a
j
or
M
i
nor
P
wr
7
7
5
0
MD
A
-a
X
P
1
-1
0
0
G
B-CF
P
St
at
Lnk
A
ir
F
ilt
e
r
A
c
c
e
s
s
7750 SR
-
a8
2
4
24584
1
3