Screw Tightening Information

Loose screws can cause a reliability problem. The IBM ThinkPad computer addresses this problem with nylon-coated screws. Tighten screws as follows:

Plastic

to

plastic

 

 

Turn

an

additional90 degrees

after

the screw head

touches

the surface

of the

plastic part:

Logic

card

to plastic

 

 

 

Turn

an

additional180 degrees

after

the

screw head

touches

the surface

of the

logic

card:

Torque driver

If you have a torque driver, refer to the “Torque” instruction with each step.

How

to

Use

Error

Messages:

Use the error

 

 

 

 

 

codes displayed on the screen

to

diagnose

failures. If

 

more than one error code

is displayed, begin the diagnosis

with the first error code. Whatever caused

the first

error

code can result in false

error codes being displayed. If no

error

code

is

displayed,

see

if

the

error

symptom

is

listed

in the “Symptom-to-FRU Index” on

page 23.

 

 

 

 

 

 

Port

Replicator

Problems:

If you suspect a

 

 

 

 

 

problem with the port replicator, see “Port Replicator

 

 

Checkout” on

page 18.

 

 

 

 

 

 

 

 

 

 

How to Diagnose Multiple FRUs:

 

When the

 

 

 

 

 

 

adapter or the device has more

than

one

FRU,

the

error

code could be caused by any of them. Before replacing

 

multiple

FRUs,

try

removing

or exchanging each FRU, one

 

by one in the designated

sequence,

to

see

if

the

symptoms

change.

 

 

 

 

 

 

 

 

 

 

 

 

 

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IBM 380Z manual Screw Tightening Information, How Use Error, Port, Problems