IBM 7133 Series Service Manual

Using the SRN TableImportant: You should have been sent here from “MAP 2010: 7133 – START.” Do notstart problem determination from the SRN table; always go to “MAP 2010: 7133 –START” on page 2-2010-1 first.| 1. Locate the SRN in the table. If you cannot find a particular SRN in the table, go to| the SRN list that is in the SSA Adapters: User’s Guide and Maintenance Information| manual. If you still cannot find the SRN, you have a problem with the diagnostics, themicrocode, or the documentation. Call your support center for assistance.2. Read carefully the “Action” you must do for the problem. Do not exchange FRUsunless you are instructed to do so.3. Normally exchange only one FRU at a time, starting from the top of the FRU list forthat SRN. Always use instructions given in Chapter 3 when exchanging FRUs; apage reference is given with each FRU in the FRU list. After each FRU is exchanged,go to “MAP 2410: 7133 – Repair Verification” on page 2-2410-1 to verify the repair.FRU Names Used in the SRN TableThis section provides a glossary of the FRU names used.FRU Name inTableDefinitionBackplaneassemblyEither of two vertically-oriented circuit boards that are located at the centerof the 7133. The 7133 has a front backplane assembly and a backbackplane assembly. The disk drive modules, power cards,| power-distribution tray assemblies, and signal cards, or bypass cards, areplugged into the two backplane assemblies.Back-power card Either of the two power cards at the front of the 7133. Each card isplugged into the back backplane assembly and is connected (by way of acable) to one of the power-distribution tray assemblies.Disk drive module A disk drive attached to a carrier that plugs into one of the backplaneassemblies in the 7133.External SSA cable A cable that connects the 7133 to an SSA adapter or to another device (forexample, another 7133).Fan-and-power-supplyassembly| An assembly that consists of a power supply unit and a fan. The 7133| Models 010 and 500 can have two fan-and-power-supply assemblies andone dummy fan-and-power-supply assembly, or three fan-and-power-supply| assemblies, whichever is suitable for the required configuration. Models| 020 and 600 always have three fan-and-power-supply assemblies.Power-distributiontray assemblyEither of two assemblies that are located in the front of the 7133. Eachpower-distribution tray assembly consists of a connector tray and a powercard.Signal card| One of the four cards at the back of a 7133 Model 010 or Model 500. Thecards are plugged into the backplane assemblies of the 7133. Each signalcard has two SSA connectors for the external SSA cables.| Bypass card| One of the four cards at the back of a 7133 Model 020 or Model 600. The| cards are plugged into the backplane assemblies. Each bypass card has| two SSA connectors for the external SSA cables, and a switch that| automatically connects or disconnects the disk drive module strings| internally when external SSA cables are connected or disconnected.SSA adapter card The SSA adapter card to which the 7133 is connected. The adapter card islocated in the using system.Chapter 2. Problem Determination Procedures 2-3