C:
Commodore
® E - -
AMIGA
®
~£
_
HARD DRIVE PLUS
USER'S
GUIDE
DRIVE
INFORMATIO
N
For later reference, please record the information listed on the bOllom
of
the
AS90
in
the spaces provided below.
TYPE:
______
__________________________
_
MANUFACTURER:
____________
__________
_
MODEL:
____________________________
_
NUMBER OF CYLINDERS::
____
______________
_
SECTORSPERTRACK::
____________________
__
NUMBER OF HEADS:
__________
__________
_
SERIAL NUMBER::
__________________
____
_
DRIVE TYPE: (Circle one)
XT / SCSI
C:
Commodore
®
~
- -
AMIGA
®
~~-
_
HARD DRIVE PLUS
USER'S
GUIDE
COPYR I
GHT
Thi
s manual .
1:
)
19
89
Commodo
re
-
Amiga
. Inc ..
All
Ri
~hls
Reserved.
Thi
s document may nO
I,
m who
le
or
in
pari
be
copied, photocopied. reproduced.
tran
slated, or reduced 10 any
elc
~"
Ironic
f1l('dium or
ma
c
hine
readable
form
.
without
prior
co
ns
ent,
in ""riling.
fmrn
Commodore
-Amiga. Inc.
With
Ihis dOCUlTI(nt,
Commodore-Amiga
makes no warranti{'
",
or
guaraflll!c
~.
ejlhN
nj)re
v,cd
or impl
ie
d.
wilh
respect to
t~
products
de
scribed. their
fUrK:liona1i
'
~
'
.
compatibility.
or
3\ail
·
ability.
FUrl~
r
.
Commodo
...
!-
Am
iga ass
um
es no re<;pomitJility or liabilit}' for
"
Ialemcnl
~
or
repre!!cmali
ons
made by itSelf
or
by
th
i
rd
party
vendor-. or in
the
puhllc
ation'
repr(ldu~'ed
herein. IN
NO
EVENT
WI
LL
CO
MMODORE
-
AM
I
GA
BE
LlAHLE
FOR DIRi:.
CT,
I
ND
I·
RECT. INCI
DENTAL.
OR
CONSE
QUENT
I
AL
DAMAGE
S
RE
SULTING FROM
ANY
C
LA
IM
ARIS
IN
G
OUT
OF
THE
REPRESENTATIONS
MADE
HEREIN. [VE:-.I
IF
IT
HA
S BEEN
ADVI
SE
D OF
THE
PO
SS
I
BILITIE
S OF SUCH DAMAGES.
SO
~1E
STATES
DO
NOT
ALLOW
THE
EXCLUSION OR
LIMI
TATION OF
SUC
H WARRANTIES OR
DAMAGES.
SO
THE ABOVE EXCL
US
IONS
OR
LIM
IT
AT
IONS
MAY
NDT
A PPL
\'
.
Inf
orma
tion in this document is subject to
change
",;,h(\u! nOlice and docs nOI represent a
commitment
on
the
part
of
Commodo
r
e-
Amiga.
The
software de
sc
ribed
in
Ih
i'
d
oc
ument
i
~
furni~d
under aiKen$(' agreemem or
n
o
nd
isclo
~
urc
agreemt'nl. 11
b.
a
g:t
im
t t
he
la
....
10
l'O
p~
Ihi\
sof",
"'
are
on
magnetic
tape
.
di
sk.
or
an
y athel medium for any pUr
ptN::'
O
lh
er than
lhe-
purcha!>er'~
personal
use
.
Anllga
i~
a
reg
i
stere
d trademark
of
Co
mm
odo
re
-
Ami
ga. In
c.
Cummod
ore
:tlld the Commo-
dore 10iO are registered
trademarks
of
Com
modore Eleclro
ni
c\
Limited.
1\
-IS·
00
S
i~
..
1
re.cl'"
lered
trademar
k
of
the Microsoft
Corpo
ration. PC :XT j, a Tegi",ered
Iradclllar~
of
Ir
Hcrna-
lional
Bu
sineu
Ma
chines,
Inc .
UN
IX
i~
a regis
terc=d
Irade=mark
of
AT&T.
Ep
~(l
n
10,
3
rc=
gi~
t~r~d
Iradt-mark
of
Epson
Amc:rka,
Inc.
SeagalC=
is a
f~gl
sl
crcd
trademar
k
of
Scagate
Te
c
hnolog
ies.
Inc.
WARN
I
NG:
Th
is
equ
ipnl(nI
has
bttn
c
enifi
c=
d 10
comply
v.ilh
the
limits for a Class B
..::o
mpul-
ing
devicc=.
pursuant
to
s
ubpart
J of
Pan
15
of
the
F
ederal
Comm
un
i
c
alion
~
Commissions
rules.
and
Standard
C I
08.8·
M 1983
of
the
Ca
n
adian
Slanda
rd
~
A
S~
OC
l
ation'
)
regulation
...
T~
ru
les a nd regul
ations
are
de
signed to
provide
rcaso
nahle
protcc
tion
again
st
radio
and
te1ev
i
~ion
interference in a residential
insta
llation . H
Tl
C'l
in'ta
lled
properl
y.
in "
tr
iet a
ceor·
dano.:e
.....
ith
the
ma
nufactu
rer's
ins
truction
s.
it
may
cau,e
interference. If you
~tI~
P~(t
illlcrf\.·r-
erlCe. you
ca
n test this
equipment
by
turnin
g
il
on
and
off. If
thh
('4uipment d
oe,
c
au
se
interference.
COf
rect
it
by
doing
any
of
the
following:
•
R
eor~
ntl~
receiving
antenna
or
plug .
•
Cha
nge
the
relati\,(, positions
of
the
peripheral
and Ihe receiver.
~
Plu
g
the
equipment
into
a different outlet
so
thai
the
peripheral
and
recei' er
arc
on
different
circuils.
C
AUTION
:
Only
equipment
with
shield-gr
ounded
cables
(
cO
mpUleT
input
-output
de\ice
~
.
ter-
m
Lnal
s.
printe
rs. et
c.)
,
ce
rtified 10
co
mply
with
Cla
ss B limits. c
an
be
all
a
ched
to this deviet'.
Oreration
with non-ce
rtif
ied
equipment
may
result in
communica
tions illlerferenee.
)'
('I
UT
house AC wall
receptacle
must
be
a three-
pronged
type (AC'
ground)
. If
nm.
co
nta
ct
an
ck(trician
to install
the
proper
receptacle
.
If
a
multi
-co
nTlC1:tor
box
is used
to
":('I
nnect the
(Ompu
tl'r
and
peripherals
to AC'.
the
grou
nd
mu
~t
be
common
to
all unit
).
I f
ne(c~sary.
contact
your
Commodore
dealer
or
an
expc=ricl
'k.'
cd
radio
·
TV
t
et.
:
hm
ci
.m
for
addi
-
tional
\
uggc"'ion~
.
Y
ou
may
find
the following
FC
C'
b
oo
klet
help
ful : " How
10
Id
entify
and
R
c\olve
Radio-
TV
InterfercO(e Problem>;
."
Th
e
boo
klet i
..,
availab
le from the U.S. Gt,,,,:rn-
men I
p,
i nt ing
Office.
\\'a
shi
ngt0n,
D
.C.
20402.
stock
no
.
()()..l-()()()
·{
IOH5-
-'
.
Contents
INTRODUCI
NG
THE
A590
..
....
.
............
.
.............
.
..
.
STALLING
THE
A590
..
............................
.
........
3
Installation
Pr
ocedure
..
......
..............................
3
Connecting External SCSI Devices
.....................
.
......
8
In
stalling R
ando
m Access Memory (RAM) Chips
....
.
...........
8
US
IN
G
THE
HARD
DISK
...........................
..
.
....
.
....
15
Copying Programs to Your Hard
Di
sk
....
.
...
.•.
..
. .
..
.
..
.
....
15
Saving/
RelTie
v
in
g Files .
........
.
......
..
. .
.•.
..
..
. .
....
...
.
19
Backing Up Your Hard
Di
sk
...
........
..
...
.
....
.
...
........
19
Re
coverable Errors
........
.
...............
. . .
.........
20
Nonrecoverable Errors
.............
........
.
..
....
....
.
20
CHANGING
THE
STA
RT
UP·SEQUENCE
.
.........
.
.............
23
THE
A590
SETUP
DISK
...
.....
.
..
..........
..
.................
25
Ki
cks
taTl
1
.3
Users
......
..
.....•..
.
..
. .
......
.. ..
...
•.
....
.
25
Ki
cks
taTl
1.2 Users
.............•.
. . .
.........
.
...
.
....
.
....
26
Quick
In
stallation
...
..
...
..
........
.
....
. . .
........
........
26
Using the A590 Setup
Di
sk
..................
.
.........
...
....
27
Using the
In
stallation Soflware
....................
.
....
. 28
Usi
ng the
HDT
oo
lbox
Pr
og
ram
..........................
34
Hard Drive Preparation, Pa
Tliti
oning and Formalling
...
35
Change Drive Type
.....
.
.......
.
...
.
.............
39
Define/ Edit Drive Type
.........
.
................
.41
Bad
Bl
oc
ks
.....
.
............
..•.......
:
...
.
..
. . .43
Parllllonmg
....
..
..............
.
................
44
File
Sys
tem Characterist ics . .
..
.
....
.
..
.
.........
. . .49
File System Maintenance
.......
....
.....
..
.........
51
APPENDIX
A TROUBLESH
OOTING
...
....
....................
53
APPENDIX
B DIP S
WIT
CH SETTINGS
...........
...
..........
54
APPEND
IX C
TECHN
ICAL
SPECIF
ICATIONS .
......
..
..
. .
.....
55
APPENDIX
D SOME USEFUL
TERMS
....................
.
....
61
Introducing
the
A590
The AS90
Hard
Drive Plus
is
an external hard disk drive plus a controller
card and expansion memory unit for the Amiga
SOO.
The AS90 connects to
the side
of
the Amiga
SOO
and comes with a disk containing all the software
required for operation.
The AS90 includes the following features:
• 20
MB
of
disk
slO
rage.
• Sockets for SI2KB, 1MB, or 2MB
of
fast random access memory
(RAM)
chips.
• Direct Memory Access (DMA) for fastest possible operation.
• ConneclOr for the use
of
Small Computer Standard Interface
(SCSI) expansion devices.
• Autoboot ROMS to allow you to boot your system from the hard
drive, if
you
are using
Kickstan~
1.3.
Note:
To
obtain the full potential
of
the AS90,
you
will want
10
have the
Kickstan 1
.3
ROM
upgrade installed
in
your Amiga
SOO.
With the Kickstan
1.3
ROM
s you will be able to automatically
boO!
your system from the AS90,
providing faster access to all your files.
You
can determine whether your Amiga has Kickstan 1.2 or 1.3 by
staning
your system without a disk
in
the floppy drive. The screen
will
show a hand
holding a Workbench disk, with the version number below
it.
If the version
number
is
1.2, your. Amiga is using Kickstart 1.2. Please see your Amiga
dealer concerning the
ROM
upgrade.
If
the version number
is
1.3, your
Amiga already has Kickstan 1.3.
This user's guide explains how to:
• connect and set up the AS90.
• connect external SCSI devices.
• install RAM chips on the AS90 board.
• use the HDToolbox software to set up and configure your
hard disk.
•
use
the
reinstallation software
(0
rebuild
you
r hard
disk
in
the
event
of
a catastrophic loss
of
data.
Note that with the addition
of
the A590, your system will still operate nor-
mally using the floppy disk drive.
Installing
the
A590
WARNING: Commodore will not be responsible for any injury
or
damage
resulting from improper installation. Such improper
in
stallation will also
void the warranties on the A590 and the Amiga 500. Read this manual before
attempting to
in
stall the A590. Turn the computer
off
and unplug the power
cord before proceeding. Installing the A590 with the power on could cause
personal injury to
yo
urself and damage to the equipment. Make sure that
nothing is attached to the computer. Disconnect all peripherals and power
cords, and put them aside. The A590 requires adequate ventilation. Do not
block the openings in the A590
or
place
it
in
an enclosure
or
on
a carpet.
Most hard disk failures
occur
due to improper handling: never subject the
A590 to electrical
or
ph
ys
ical shock.
Unpack the A590 a
nd
make sure that
you
have a
ll
the requir
ed
part
s:
• A590 hard disk drive.
•
gro
und clip.
• power supply.
• A590 setup disk
• warranty card.
Record the information
li
sted on the bottom
of
the A590
on
the inside cover
of
this manual.
Installation
Procedure
The following steps, required to install the A590, are explained
in
detail,
heginning on the next page.
I. Turn
off
and disconnect the A500.
2.
Set the
DIP
sw
it
ch
es
at the back
of
the A590.
3.
Open the side panel
of
the Amiga 500.
4.
Co
nnect the ground c
li
p 10 the Amiga 500.
5.
Co
nnect the A590 to the Amiga 500.
6.
Co
nnect the power supply to the A590 and AC outlet.
J
1.
Turn
off
and
diseonnect the A500.
Thrn
off
the
ASOO,
and
unp
lug
th
e power cable. Disconnect a
ll
peripherals
and c
ab
les from the
ASOO.
2. Setting the
DIP
switches.
There
are four
DIP
switches l
oca
ted at the back
of
the AS90.
The
sw
it
ches
are
shipped in the
off
pos
iti
on
.
If
you
are
using
Ki
cks
tart
1.3
you will want to
set
DIP
switch I
to
on.
If you
are
using
Ki
cks
tart
1.
2 you
ca
n
co
nnect
th
e
AS90 with
th
e
DIP
switches in
th
e cu
rren
t p
os
itions.
Note: If yo
ur
Wo
rkb
ench
m
prompt
requests Workbench 1.3,
yo
u
are
using
Kicks
tart
1.
3.
If
it
requests Wo
rkb
ench 1.2, you are using K
ic
ks
tart
1.2.
DIP
switch I enables and disables
th
e
Aut
oboo
t ROMs.
DIP
switch 2
co
n·
trois whether the syst
em
will l
oo
k for more
than
one drive at each l
og
ical
SCS
I
add
ress.
DIP
switch 3 sets a long or short
de
lay between when you
turn
the power on
and
when yo
ur
system checks the drives. DIP switch 4 is
reserved for later use.
DIP
sw
it
ches 2
and
3
are
o
nl
y used with external
SCS
I
drives. For more information
on
th
e 01 P switches refer to Appendix B .
'.
::
::
"
..
'.
"
...
'j
.
.
~
.
:
" .
• •••••••••••••
••••••••••••
po
.....
er
C
onoeclOf
•
ole:
Each
switch is
off
when in the
down
position,
and on when in the
up
posirion.
4
The A590 is supplied wilh a
ll
swilches ofr. The AUlobool
ROM
s
are
disabled;
Ihe
sYSle
m will l
oo
k for only one device al each physical address; and Ihe
sys
tem
will
allow a sho
rt
amount
of
time
between
when
it
powers
up
and
when
il
checks Ihe dri
ves
.
3.
Op
ening t
he
A
mi
g.
500.
There is a panel on Ihe l
ef
l
si
de
of
the compulcr Ihal mu
Sl
be removed
10
ex
pose Ihe
co
nnecl
or
la
b
10
be used
by
the A590. In
sen
a small screwdriver
in Ihe SIOI, and
puillhe
panel down and away from Ihe computer.
4.
Co
nnecting the grou
nd
cl
ip.
The ground clip muSl be connecled
10
the ground s
hi
e
ld
of
the A500.
Th
e
ground s
hi
e
ld
is
a Ihin sheel
of
metallocaled
in
Ihe expansion S
IOI,
bel ween
Ihe connector
tab
and the plaslic housing on Ihe bOllom
of
the A500.
Th
e
re
is
a thin sheel
of
plaSlic or c
ardboard
in
sulalion on
lOp
of
Ih
e ground shield.
C
Qflntt
lOf
b
..
\
.
\ \
,
~
Y
''''''nd
/
\h~kI
5
./
/'
/'
~
\
'"'
uta! IOn
""'"
Insert the top
of
the ground clip, the side with the red
in
sula
ti
on, between the
plastic or
cardbard
sheet and the ground shield, as shown
below.
Note that the
bOllom
of
the ground clip fits under the housing
of
the A500.
bouom
or
Aloo
housino
insulation
......
,,,,,,
",,
sIridd
",(lUnd
clip
-
Note:
If
you
wish to connect
an
external SCSI drive or install RAM chips
please refer to tbe appropriate section before connecting the A590 to the
A500.
5. Conneeling the A590 to the Amiga 500.
Align the connector on the side
of
the A590 with the tab on the left side
of
the
computer. Slide the A590 directly towards the computer umil the casings
almost touch. Do not force the A590. If the A590 seems to
be
s
lU
c
k,
pull
it
directly away from the computer and realign the connector.
6
6. Connecting lhe power supply.
The A590's power supply brick has a AC power cable
and
a 4'pin cable
allached to it. The 4-pin cable connects to the back
of
the A590. Align the
pi
ns with Ihe socket on the A590 and insert the cable. Connect the power
cable to a grounded AC ou
tl
et.
Reconneci all cables and peripherals to the computer. Thrn the power on
to
the Amiga 500. The A590 has been designed so that the A590 turns on and
off with the Amiga 500 .
.
Note: Befo
re
us
in
g the A590
for
the first time
you
should run Verify 001 a on
Dri
ve
from HDToolbox on Ihe A590 Setup disk. This
will
c
heck
to
see if any
disk blocks ha
ve
been damaged during shipment .
I. With the A590 connecled, boot your system with the A590
Se
lup
disk
in
the floppy drive.
2. Double
-cli
ck on the A590 Setup icon.
3. Double-
cli
ck on the
HO
Toolb
ox
ic
on.
4.
When the Hard
Di
sk
Pr
epara
ti
on, Partil
io
ning a
nd
Fo
rmalling
sc
reen appears, cl
ick
on
Ve
rify Oala on Dri
ve
.
Wh
en prompled
by
the requestor, click on
Co
ntinu
e.
7
5. If
lh
e verification finds
11
0
crror~,
you
GlIl
di
ck on Exit
and
con-
tinue n
or
mall
y.
If
any
er
ror,
arc
fo
un
d
yO
ll
~
tlOuld
Exit
and
then
rLin
PrepHIJ
and
Formal/H)
'"
d
escribe
d
Lind
er
U
sin
~
the
Instal·
lation
So
ftware
.
on
pag
e 28.
YOllr
A590
is now in
sta
ll
ed. If
yo
u
ar
e
110t
going
to
co
nnect
an
externa
l
SCS
I
drive.
or
add
RAM
c
hip
s. please
go
to
The
A590
Se
tup
Disk on page 25.
Connecting External SCSI
Devices
You can
co
nn
ec
t
up
to s
even
ex
ternal CSI devices 10
th
e
A5
90, using
the
con
n
ector
at
the
back
of
th
e
A590
. To
connect
the first
SCS
I device. gently
insert {he devi
ce's
c
on
n
ector
into
th
e A 590'
;;
con
neclOr
and
"icc
ur
c
th
e screws.
Th
e
SCS
I device will need to have its own power s
Lippl
y.
Additional
SCS
I
devices c
an
be
co
nnected in a
dai
sy-chain. (
Th
e
fi
rst pe
ri
pheral dc\'i
re
co
n-
nec
tS 10
the
A590,
I he second device
co
nn
ect
~
to
Ille.?
fir\1 device.
and
"0
on.)
For
inf
ormation
on
DIP switch settings for external
SCS
I driv
es
refer 10
Appendi,
B.
Installing Random
Access
Memory (RAM) Chips
You
ca
n ins
tall
RAM
c
hip
s in
the
A590 to increase the me
ill
ory available
to
yo
ur
Ami
ga
500. Y
ou
ca
n install 512K B, I
MB
or 2M B
of
add
itional m
emo
r
y.
Note: Use only C
MO
S 2S6k x 4
DRAM
s.
with
an
access speed
of
120 ns
or
faster. Slower
DRAMs
will
not
work
properly
.
Do
not
use
:-I
MO
S
DR
AMs.
The
use
of
NMOS
DRAM
s will
damage
the
AS90
and
void your
warranty
.
RAM
chips
are
sensitive
to
s
tatic
elcctricily.
Co
nt
act
with
a c
hip
when
hi
gh
levels
of
static elf'Ctricity
are
present
co
uld
ruin
a c
hip.
Touching
a
ncarb)'
gro
und
ed
metal
s
urfa
ce
be
fore
touchin
g
the
c
hip
ca
n help
rrdu
ce stat
ic
I{'nls
.
8
In
sta
ll
a
ti
on
of
RAM chips should
be
performed
by
an authorized Commo-
dore Ser
vi
ce Ce.nter, or
by
yo
ur Commodore dealer. Commodore will not be
responsible or liable for any damages caused by improper insta
ll
ation
of
RAM chips.
WARNI
NG
: If your A590
is
connected
10
the computer,
you
mu
st first turn
off the power, disconnect a
ll
cables and peripherals, and detach the A590
from the computer
by
carefu
ll
y pu
ll
ing the A590 directly away from the
A500.
The following steps, required to install RAM chips, are explained
in
detail
be
l
ow.
I. Remove the A590's cover.
2.
Remove the dr
ive
a
nd
the drive shield.
3. Insert the RAM chips.
4. Set the RAM size jumper.
5.
Replace the
dr
i
ve
and the cover.
1.
Rem
ov
in
g t
he
AS90's cover.
Locate t
he
two screws on the connector side
of
the A590. Loosen these
sc
rews,
but
do
not
remove
them.
Locate the eight screws on the bottom
of
the A590. The outer four connect
the cover to
the
base and the inner four connect the drive and
the
drive shield
to
the
base. Remove
the
outer
four
and
set
these screws aside.
9
•
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•
®
.,
.,
•
•
. )
.,
.,
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.,
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.,
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•
• 0 0
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drive
se
re
....
s
Place the A590 on a flat s
urfa
ce and car
efu
ll
y lifl the cover straight ofr.
Di
sc
o
nn
ec
t
the
fan
power cable from
the
printed circuit board in
the
ba
se
of
the A590.
NOle
lhe alignment of the
LED
ca
bl
e
if
the
re
is one, so that
it
can
be reconnected properl
y.
Di
sconnect the
LED
c
ab
le and put the cover aside.
10
2. Removing
th
e d
ri
ve
a
nd
th
e drive shie
ld
.
Locate the ribbon cable connector and the power cable connector and note
how
they connect to the board, so
you
can reconnect them properly. Discon-
nect them from where they attach to the board. Always handle each ca
ble
by
the plastic connector.
Remove the four remaining screws, and put them aside, separate from the
first four screws. Lift ,the drive and shield
off
and put them aside in a safe
place. Place the drive on a soft, non-conduc
ti
ve
surface. Do not subjecl
Ih
e
d
ri
ve
10 shock.
I I
3. Inserling lhe
RAM
chip
s.
NOIe:
Be
careful
10
properly align lhe chips
hefor.
inserling
lhem.
Do
nol
force Ihem
or
bend lhe pins.
Turn
Ihe A590's
board
so Ihal
it
matches
the
illuslralion on
the
nexi page.
It
is
important
that
the chips be inserted properly. Each chip
has
a notch
or
dot
on one end to show the l
oca
ti
on
of
pin I.
When
the
end
with the notch
or
dot
is held to Ihe left, pin
I will be in the lower lefl
co
rner.
The
chip
should then
be
in
serted
so
that
the notched
end
is towards the l
eft
of
the
board.
The
local ion for pin I is circled in the illustration below. Align the chip wit h Ihe
socket
and
insert
it
wi
th s
li
ght
pre
ss
ur
e. I f you
are
in
sta
lling 512 kilobyles
of
memory (4 chips), insert them in the four
soc
kets label
ed
SI2K. If you
are
installing I megabyte
of
memory
(8
chip
s), insert
th
em in the eight sockets
labeled
St2K
and
I
MEG.
If
you
are
insta
lling 2 megabyt
es
of
memory (16
chips), insert Ihem in all
16
soc
kets.
4. Selling lhe
jumper.
You
must sel a
jumper
on
Ihe
board
10
match Ihe
amount
of
RAM
inSlalied.
As shipped. the
jumper
is set to
"Amn
esia" ,
or
no
RAM
insta
ll
ed. Lift Ihe
jumper
straight
off
and
replace it on the set
of
pins labeled the
sa
me as Ihe
amount
of
RAM
inslalled.
S.
Replacing lhe drive and
the
cove
r.
Replace
the
drive and the drive shield. Reconnect the
ribb
on
cab
le
and
Ihe
power cable.
Make
certain
that the
co
nnectors
and
the pins are aligned prop-
erly.
The
power
cab
le
co
nnector is s
haped
so that
it
c
an
only fit the
co
rrect
way.
Replace the four
Sc
rews to hold the dri
ve
and
shield in place. Reconneci
the fan's power cable to
th
e
board
. Reconnect the
LED
cab
le if there
is
one.
Replace Ihe cover
and
install
the
four screws. Tighten the two screws
on
the
conneclOr side
of
the A590.
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13
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