All PowerNote: Unless you have a particular reason to do so, do not remove power from the usingsystem or from the 7133 unless the instructions that you are following tell you to.| This section has three parts:|  “Power (Models 010 and 020 with 220 V Fan-and-Power-Supply Assemblies)” on| page 3-8|  “Power (Model 020 with −48 V dc Fan-and-Power-Supply Assemblies)” on page 3-10|  “Power (Models 500 and 600)” on page 3-15.| Go to the part that is relevant to the 7133 you are servicing.Chapter 3. Removal and Replacement Procedures 3-7

IBM 7133 Series Service Manual