IBM 2142, 2140 manual Chapter Description, Diagnostic Information, Start, Beeps, Fru

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 check procedures you use to diagnose and isolate product failures. Diagnostic information consists of:

Start:

This is the starting point for any diagnostic action. Based on high-level symptoms, the information in this check procedure directs you to more detailed procedures to help you resolve the machine failure.

Symptoms,

Messages,

Error

Codes,

and

Beeps:

The Index of Symptoms, Messages, Error Codes,

or

Beeps

lists

symptoms and their probable causes, and directs

you

to

the

applicable

check

procedures to

help you

resolve

the

machine failure. The

index

also

lists

which

FRU

is

the likely

cause

of

the

problem.

Check Procedures:

When the Start check procedure sends you to a specific check

procedure or the Index of Symptoms, Messages, Error

Codes, or

Beeps,

turn

to

that

section

and

perform

the

steps

as

instructed. If

there

are

any

notes

or instructions at the top

of

the

page,

read them

before you start the procedure.

Carefully read each step of the check procedure 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 with that

information. Always

return

to

the

check

procedure

after

you

do

this.

In

some cases,

you

are

sent

to

other

check

procedures

to

find the

failure.

Diagnostic

Aids:

The

Diagnostic

Aids

chapter

contains

additional

information

to

help

you

diagnose

a

failure

of

a

specific

part.

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