Removing or moving the cable-management arm

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You might need to move the cable-management arm (CMA) aside to complete service tasks. If needed, you can also remove the CMA from the 5U expansion enclosure.

About this task

The cable management arm (CMA) consists of an upper and lower arm assembly, as Figure 1 shows. The upper and lower are independent of each other. They can be installed, moved, or removed from the enclosure individually.
Figure 1. Upper and lower cable-management arms
Upper and lower cable-management arms

To complete many service tasks, you can swing the CMA assemblies away from the expansion enclosure. You do not have to completely remove the CMA assemblies from the enclosure. For these service tasks, complete step 1 through step 4 in Moving the cable management arms.

However, you might need to remove a CMA assembly from the 5U expansion enclosures. To do so, complete step 1 through step 8 in following procedure.

Procedure

Remove the upper CMA assembly

The connectors of the CMA are installed on the rail hooks at the end of the support rails. Figure 2 shows the connectors on the upper CMA assembly.

Figure 2. Connectors for the upper cable management arm
Connectors for the upper cable management arm
  •  1  Inner connector on the upper CMA
  •  2  Connector base on inner rail member
  •  3  Outer connector on the upper CMA
  •  4  Connector base on outer rail member
  •  5  Support rail connector on the upper CMA
  •  6  Connector base on outer rail member

  1. Press the latch on the connector base on the upper CMA assembly ( 5  in Figure 2).
  2. Pull the connector to remove it from the connector base on the right support rail ( 6  in Figure 2).
  3. Press the latch on the outer connector of the upper CMA assembly ( 3  in Figure 2).
  4. Remove the outer connector from the inner member of the left support rail ( 4  in Figure 2).
  5. Remove the inner connector of the upper CMA assembly ( 1 ) from the inner member of the left support rail ( 2 ), as shown in Figure 2.

Remove the lower CMA assembly

Note: The procedure for removing the lower CMA assembly is the same as the procedure to remove the upper CMA assembly. However, the connector locations are reversed. For example, the connector base of the upper CMA ( 5  in Figure 2) connects to the right rail. The connector base of the lower CMA ( 11  in Figure 3) attaches to the left rail.
Figure 3. Components of the lower CMA assembly
Components of the lower CMA assembly

  1. Remove the connector base on the lower CMA assembly ( 11 ) from the connector on the left support rail ( 12 ), as Figure 3.
  2. Remove the inner connector of the lower CMA assembly ( 9 ) from the outer member of the right support rail ( 10 ), as shown in Figure 3.
  3. Remove the outer connector of the lower CMA assembly ( 7 ) from the inner member of the right support rail ( 8 ), as shown in Figure 3.

Replace the CMA assembly

  1. To reinstall the CMA, or replace it with one from FRU stock, follow the procedure in Installing or replacing the cable-management arm.

Moving the cable management arms

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About this task

To complete most service tasks, you can swing the CMA assemblies out of the way. You can move each arm independently or you can move both arms. For example, Figure 4 shows that both of the CMA assemblies are swung away from the rear of the enclosure.

Figure 4. Upper and lower CMA assemblies moved aside
Upper and lower CMA assemblies moved

Figure 5 shows that the lower CMA assembly is swung away from the rear of the enclosure so that the expansion canister is accessible.

Figure 5. Lower CMA assembly moved
Lower CMA assembly moved

Procedure

  1. To release the upper CMA, push the latch on the support rail connector  5  to release it from the connector base  6  on the right rail.
    Figure 6. Release the upper CMA assembly
    Release the upper CMA assembly
  2. Move the upper CMA to the left to swing it out of the way.
    1. To reattach the upper CMA to the rail, reverse the procedure.
  3. To release the lower CMA, push the latch on the support rail connector  11  to release it from the connector base  12  on the left rail.
    Figure 7. Release the lower CMA assembly
    Release the lower CMA assembly
  4. Move the lower CMA to the right to swing it out of the way.
    1. To reattach the lower CMA to the rail, reverse the procedure.