Ibm 6643 User Manual download pdf (Page 24)

Installing

a

DIMM

Notches

1.

Position

the

DIMM

above

the

connector

so

that

the

two

notches

on

the

bottom

edge

of

the

module

align

properly

with

the

empty

connector.

2.

Firmly

push

the

module

straight

down

into

the

connector

until

the

retaining

clips

pop

up

and

fit

snugly

around

both

ends

of

the

module.

Power

Supply

If

the

power-on

indicator

is

not

on,

the

power-supply

fan

is

not

running,

or

the

computer

will

not

power-off,

do

the

following:

Check/Verify

FRU/Action

Check

the

following

for

proper

installation.

v

Power

Cord

v

On/Off

Switch

connector

v

System

Board

Power

Supply

connectors

v

microprocessor(s)

connection

Reseat

Check

the

power

cord

for

proper

continuity.

Power

Cord

Check

the

power-on

switch

for

continuity

when

pressed.

Power-on

Switch

If

the

above

are

correct,

check

the

following

voltages.

20-pin

main

power

supply

connection

See

“System

board

layout”

on

page

14.

Attention:

These

voltages

must

be

checked

with

the

power

supply

cables

connected

to

the

system

board.

Pin

Signal

Function

1

3.3

V

+3.3

V

dc

2

3.3

V

+3.3

V

dc

3

COM

Ground

4

5

V

+5

V

dc

16

Hardware

Maintenance

Manual

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