For
HP
Internal Use
Only
1.
External
SCSI
terminator:
If
the
configuration contains
an
external
device, make sure
that
the
last
device
in
the
chain contains
an
ACTIVE
terminator.
The
active
terminator
is
product
number
K2291
(part
number: 1252-3920).
The
active
terminator
can
be
identified
by
its
construction
material
(chrome-color plastic). Do
not
use
terminators
made
of black
or
grey plastic,
or
chrome
metal.
2.
High density
terminator:
If
there
are no
external
devices, make sure
that
the
high density
terminator
is installed on
the
Multifunction
I/0
card.
3.
Cable length: Make sure
that
the
total
cable
length
does
not
exceed six meters.
Count
both
internal
and
external cable lengths.
The
internal
cable
length
for 2-slot
standard
chassis systems is 1.5 meters.
The
internal
cable
length
for 6-slot
and
12-slot expanded
chassis is
3.0 meters.
4.
Old
SCSI cables: Old SCSI cables are known
to
generate noise
in
the
SCSI bus. Do
not
use
old SCSI cables. Old SCSI cables are grey color. New cables are parchment white.
5.
Excessive
termination:
Ensure
the
ONLY device
with
termination
SIP (Single In-line
Package) resistor packs installed is
the
device
at
the
end
of
the
internal
bus. No
other
internal
or
external
devices should have
termination
resistor packs installed.
6.
Internal
cable damage: Ensure
the
internal
SCSI ribbon cable has
not
been pinched by any
of
the
sheetmetal causing wires
to
be
cut
or
the
insulation
to
be
scraped off.
7.
Termination
Power: Ensure
the
option
pin-sets on each device are selected such
that
the
host supplies power
to
the
termination
resistors.
3.5-inch
Hard
Disk
Drive
Troubleshooting
Note
The
following procedure does
not
apply
to
the
A2444A, A2445A,
and
A2958A
3.5-inch drives. Each
of
these drives is replaced as a unit.
The
hard
disk drive includes two replaceable subassemblies:
the
disk mechanism
and
the
SCSI
controller
PCA.
The
firmware ROM
on
the
SCSI controller
PCA
is also replaceable.
1.
Turn
off system power.
2. Remove
the
SCSI controller
PCA
from
the
disk mechanism.
3. Install a known good SCSI controller
PCA
on
the
disk mechanism. Make sure
the
configuration
jumpers
on
the
good SCSI controller
PCA
assembly are set
to
the
same
positions as
the
jumpers
on
the
suspect assembly.
4.
Remove
the
firmware ROM from
the
faulty SCSI controller
PCA,
and
install
it
on
the
replacement SCSI controller
PCA.
5.
Reinstall
the
disk drive.
6.
Check
to
see
if
the
problem is solved.
7.
If
the
problem persists, change
the
ROM.
8. Check
to
see
if
the
problem is solved.
Troubleshooting 5-45
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