IBM 7133 Series, Service Manual

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Chapter 3. Removal and Replacement Procedures
This chapter describes how to remove field-replaceable units (FRUs) from a 7133.
Each FRU has its own removal procedure, for example, “Fan-and-Power-Supply
Assembly”. Where a step in a specific procedure represents a complete procedure that is
described 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 Maintenance
Subject to the configuration of the 7133, most FRUs can be removed, replaced, and tested
while the subsystem and using system are powered on and doing productive work. This
ability 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 assembly
remains operational.
| Signal card (Models 010 and 500 only), because it contains two separate SSA
interfaces.
Note: Although full concurrent maintenance is not available, this FRU can be
removed and replaced subject to the configuration of the second SSA interface on the
card.
| Bypass card (Models 020 and 600 only), because it contains two separate SSA
| interfaces.
Chapter 3. Removal and Replacement Procedures
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