Appendix C: Field-Replaceable Units
7750 SR-a4 and SR-a8 Installation Guide 175
To remove an AC PSU module:
Step 1. Disconnect power from the external branch circuit.
Step 2. Disengage the power cord retainer by lifting the retainer away from the power cord.
Step 3. Remove the AC power cord from the inlet on the front of the PSU.
Step 4. Ensure that the LED is unlit (Key 1 in Figure 56 and Figure 57).
Step 5. Press and hold the latch lock to the left to unlock the PSU (Key 3 in Figure 56 and
Figure 57).
Step 6. Grip and hold the handle on the PSU with your hand (Key 2 in Figure 56 and
Figure 57).
Step 7. Pull the PSU module out of the slot (Key 4 in Figure 56 and Figure 57).
Step 8. Do one of the following:
a. If you are installing a replacement PSU module, go to Replacing an AC PSU
on page 175.
b. If you are not installing a replacement PSU module, insert an impedance panel
in the empty slot.
Replacing an AC PSU
The following procedure assumes that you have removed the AC PSU, as described in
Removing an AC PSU.
Figure 58 and Figure 59 show how to replace an AC PSU in the 7750 SR-a chassis. Table 89
describes the features.
Table 88: AC PSU Removal Features
Key Description
1 LED
2 Handle
3 Spring-loaded latch lock
4 Direction of movement
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