Installing Components
Installing a Fan Tray
The fan tray is chassis specific. The 7750 SR-a4 has four axial fans. The 7750 SR-a8 chassis requires a larger fan tray, which has six axial fans. The fan tray is mandatory, and must be installed in the vertical slot on the left side of the chassis.
Figure 35 shows how to install the SR-a4 fan tray in the 7750 SR-a4 chassis. Table 47
describes the features. The same installation method applies to the SR-a8 fan tray in the
7750 SR-a8 chassis.
Figure 35: Installing the Fan Tray (7750 SR-a4)
2
1
7750
S R-a4 Fan Tray
Pwr
Stat
7750
S R-a4 Fan Tray
Pwr
Stat
Lnk
Pwr
Stat
Lnk
1 2
Act Lnk
3
4
Act Lnk
5 6
Act
Lnk
7 8
Act
Lnk
9
10
Act Lnk
11 12
Act
Lnk
13 14
Act
Lnk
15
16
Act Lnk
17 18
Act
Lnk
19 20
Act
Pwr
S tat
Pwr
Stat
S lot Layout
1/1 XP
1/3
1/2
1/4
1
CPM A
CPM B
Pwr
Stat
DTE
DCE
Lnk
Act Lnk
Act
Console
Critical
Major
Alarms
Minor
ACO/LT
1PPS
Compact Flash
7750 SR-a4
Pwr
Stat
1
Pwr
Stat
2
3
4
5
6
Lnk Act
Lnk Act
7
8
Lnk Act
9
Lnk Act
10
Lnk Act
Lnk Act
Lnk Act
Lnk Act
Lnk Act
Lnk
Act
Pwr
Stat
Lnk/Act
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
17 18 19 20
21 22 23 24
25 26 27 28
29 30 31 32
33 34 35 36
37 38 39 40
41 42 43 44
DTE
Pwr
Stat
Console
DCE
Lnk
Act Lnk
Act
Critical
Major
Alarms
Minor
ACO/LT
1PPS
Compact Flash
2
Key
1
2
Table 47: Fan Tray Installation Features
Description
Chassis slot guide for fan tray
Captive screws
Required tools:
• #2 Phillips or flat blade torque driver
To install the fan tray:
Step 1.
Align the fan tray with the guides in fan tray slot (Key 1 in Figure 35 ).
245 8 6
7750 SR-a4 and SR-a8 Installation Guide 109
Installing a Fan Tray
Step 2.
Grip the replacement fan tray from the top and bottom of the faceplate and slide the connector end halfway into the slot.
Step 3.
Push on the faceplate of the fan tray until the connectors are fully seated.
Step 4.
With a torque driver, secure the fan tray into place by tightening the captive screws.
Torque to 4 to 5 lbf-in (0.45 to 0.56 N
.
m). Do not over torque.
110 7750 SR-a4 and SR-a8 Installation Guide
