Delta THINKPAD R40 Technical Information download pdf (Page 63)

Intermittent

problems

Intermittent

system

hang

problems

can

be

due

to

a

variety

of

causes

that

have

nothing

to

do

with

a

hardware

defect,

such

as

cosmic

radiation,

electrostatic

discharge,

or

software

errors.

FRU

replacement

should

be

considered

only

when

a

problem

recurs.

When

analyzing

an

intermittent

problem,

do

the

following:

1.

Run

the

diagnostic

test

for

the

system

board

in

loop

mode

at

least

10

times.

2.

If

no

error

is

detected,

do

not

replace

any

FRUs.

3.

If

any

error

is

detected,

replace

the

FRU

shown

by

the

FRU

code.

Rerun

the

test

to

verify

that

no

more

errors

exist.

Undetermined

problems

You

are

here

because

the

diagnostic

tests

did

not

identify

which

adapter

or

device

failed,

wrong

devices

are

installed,

a

short

circuit

is

suspected,

or

the

system

is

inoperative.

Follow

these

procedures

to

isolate

the

failing

FRU

(do

not

isolate

FRUs

that

have

no

defects).

Verify

that

all

attached

devices

are

supported

by

the

computer.

Verify

that

the

power

supply

being

used

at

the

time

of

the

failure

is

operating

correctly.

(See

“Power

system

checkout”

on

page

39.)

1.

Power

off

the

computer.

2.

Visually

check

each

FRU

for

damage.

Replace

any

damaged

FRU.

3.

Remove

or

disconnect

all

of

the

following

devices:

a.

Non-IBM

devices

b.

Devices

attached

to

the

port

replicator

c.

Printer,

mouse,

and

other

external

devices

d.

Battery

pack

e.

Hard-disk

drive

f.

External

diskette

drive

g.

DIMM

h.

CD-ROM

and

diskette

drive

in

the

Ultrabay

i.

PC

Cards

4.

Power

on

the

computer.

5.

Determine

whether

the

problem

has

changed.

6.

If

the

problem

does

not

recur,

reconnect

the

removed

devices

one

at

a

time

until

you

find

the

failing

FRU.

7.

If

the

problem

remains,

replace

the

following

FRUs

one

at

a

time

(do

not

replace

a

nondefective

FRU):

a.

System

board

b.

LCD

assembly

Symptom-to-FRU

index

ThinkPad

R40

59

1 2 ... 58 59 60 61 62 63 64 65 66 67 68 ... 183 184

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