IBM PS/1, Hardware Maintenance Service

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Chapter Description
This chapter contains general information about the contents of this manual,
product descriptions, and other information useful when servicing the
product.
“Diagnostic Information”
The diagnostic information contains the procedures you use to diagnose and
isolate product failures. Diagnostic information consists of the:
Start MAP
Maintenance Analysis Procedures (MAPs)
Diagnostic Aids
Start MAP: This MAP is the starting point for any diagnostic action.
Based on high-level symptoms, the information in this MAP directs you
to more detailed procedures to help you resolve the machine failure.
Maintenance Analysis Procedures: When Start sends you to a MAP, go
to that page and perform the steps as instructed. If there are any notes
or instructions at the top of the page, you must read them before you
start the procedure.
Carefully read each step of the MAP and perform the appropriate action as
instructed. If you do not remember the location of a specific part or test
point, or if you do not remember an adjustment or removal procedure, see
the chapter that has that information. Always return to the MAP after you do
this. In some cases, you are sent to other MAPs to find the failure.
Failing Parts or Assemblies: The MAPs generally help you trace a
problem to one part or assembly. The last step of the specific MAP you are
using indicates that a part or assembly is failing. You should inspect the
part or assembly before you decide to replace it. It may only be loose, dirty,
or in need of a small repair. The MAPs may lead you to two, or even three,
possible failing parts or assemblies. The parts that may be failing are listed
in order of the most probable failure.
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