p690 更换DCA 看GUIDE的时候 对第4条看不大懂 希望专家给解释一下
1. Open the rack front door
2. Remove the I/O subsystem front cover.
3. Locate the DCA to be replaced.
4. Proceed only if all the DCA’s LEDs go off or the repair has been scheduled. If the repair has been scheduled, power off the system as described in “Powering Off and Powering On the System” on page 854, then return here. 5. Press the green Start Service button on the UEPO switch.
6. Proceed only if all the DCA’s LEDs go off or the repair has been scheduled (System outage - EPO off),
7. Verify the cable labeling and locations, and then unplug the cables from the DCA.
8. Loosen the left and right captive thumbscrews, using the torque tool (P/N 6422789), alternating between the fasteners until the unit can slide out of the slot.
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