| 5 Verify which power cable you are going to remove, then:| a. Remove the nut 9 and connectors 8 from the relevant circuit breaker.| b. Remove the relevant screw and cable connectors 6 from the return bus bar.| c. Attention: When replacing a cable, observe the connector labels. Ensure that| you connect the −48 V connectors to the circuit breaker terminal, and the RET| connectors to the return bus bar.| Replace parts in the reverse order, then refer to Chapter 5 of the rack| Installation and Service Guide, and follow the instructions given in “Power-On| Procedure with Power Distribution Panel.”3-14 7133 Service Guide

IBM 7133 Series Service Manual