IBM 7133 Series Service Manual

Chapter 3. Removal and Replacement ProceduresThis chapter describes how to remove field-replaceable units (FRUs) from a 7133.Each FRU has its own removal procedure, for example, “Fan-and-Power-SupplyAssembly”. Where a step in a specific procedure represents a complete procedure that isdescribed separately, a reference to that procedure is given. For example:1. Remove the front cover (see “Covers” on page 3-2).2. Remove all the disk drive modules (see “Removing a Module” on page 3-17).3. .............The references show you where to find more detail, if you need it.| Note: Because these instructions relate to all Models of the 7133, some diagrams might| not specifically show the model that you are servicing.Concurrent MaintenanceSubject to the configuration of the 7133, most FRUs can be removed, replaced, and testedwhile the subsystem and using system are powered on and doing productive work. Thisability is called ‘concurrent maintenance’. Unless you have a particular reason to do so,do not remove the power unless these instructions tell you to do so.The following FRUs can be maintained concurrently in a fully-configured subsystem: Fan-and-power-supply assembly| Dummy fan-and-power-supply assembly (Models 010 and 500 only) Disk drive module Dummy disk drive module Power card Power-distribution tray assembly Control panel assembly External SSA cable.The following FRUs cannot be maintained concurrently: Backplane assembly| Note for Models 010 and 500 only: Although full concurrent maintenance is not| available, this FRU can be removed and replaced while the other backplane assemblyremains operational.| Signal card (Models 010 and 500 only), because it contains two separate SSAinterfaces.Note: Although full concurrent maintenance is not available, this FRU can beremoved and replaced subject to the configuration of the second SSA interface on thecard.| Bypass card (Models 020 and 600 only), because it contains two separate SSA| interfaces.Chapter 3. Removal and Replacement Procedures 3-1