Ibm 6643 User Manual download pdf (Page 116)

v

Operating

system

to

BIOS

to

hardware

This

is

the

recommended

way.

It’s

the

most

flexible

because

it

is

independent

of

the

hardware.

v

Applications

to

operating

system

to

BIOS

to

hardware

This

method

is

inflexible

and

is

dependent

on

the

operating

system.

v

Applications

to

BIOS

to

hardware

This

method

has

some

flexibility

but

it

is

dependent

on

the

BIOS.

v

Applications

to

hardware

This

method

is

dependent

on

the

hardware

and

is

very

inflexible.

However,

it

is

very

fast,

very

efficient,

and

it

has

no

overhead.

Hardware

considerations

Use

the

following

tools

to

help

identify

and

resolve

hardware-related

problems.

v

Power-on

self-test

(POST)

v

POST

Beep

codes

v

Test

programs

v

Error

messages

POST

does

the

following

operations.

v

Checks

some

basic

system

board

operations

v

Checks

the

memory

operation

v

Starts

the

video

operation

v

Verifies

that

the

diskette

drive

is

working

v

Verifies

that

the

hard

disk

drive

is

working

Use

the

test

programs

that

come

with

this

HMM

or

with

the

system

you

are

servicing

to

test

the

IBM

components

of

the

system

and

some

external

devices.

Also,

from

the

DOS

prompt

or

from

OS/2

Utilities,

use

the

CHKDSK

command

to

check

and

repair

hard

disk

data

allocation

errors.

Error

messages

generated

by

the

software

(the

operating

system

or

application

programs),

generally

are

text

messages.

However,

error

messages

can

be

text,

numeric,

or

both

text

and

numeric.

Any

time

there

is

an

error

message

indicating

a

problem

with

the

system,

follow

the

General

Checkout

procedures

in

this

HMM

to

resolve

the

problem.

Basically,

there

are

five

types

of

error

messages.

v

POST

error

messages

are

displayed

when

the

POST

finds

problems

with

the

hardware

or

detects

a

change

in

the

hardware

configuration.

v

POST

Beep

codes

are

sounds

emitted

from

the

speaker

if

the

POST

finds

a

problem.

One

beep

indicates

that

the

POST

completed

successfully.

Multiple

beeps

indicate

a

problem

was

found.

v

Diagnostic

error

messages

are

displayed

when

a

test

program

finds

a

problem

with

a

hardware

component.

v

Software-generated

error

messages

are

displayed

if

a

problem

or

conflict

is

found

by

an

application

program,

the

operating

system,

or

both.

For

an

explanation

of

these

messages,

refer

to

the

information

supplied

with

the

installed

software

package.

Also,

refer

to

“Software

considerations”

on

page

107.

108

Hardware

Maintenance

Manual

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